DOCSLIB.ORG

Acadian Orogeny 45–46 Accretion 112 Grampian Terrane 62–64

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Acadian Orogeny 45–46 Accretion 112 Grampian Terrane 62–64 Index Page numbers in italics denote figures. Page numbers in bold denote tables. Acadian Orogeny 45–46 arc volcanism, Ordovician 67 accretion 112 arc–continent collision Grampian Terrane 62–64 timing 73–76 seismic reflection 76 Archaean Domain Southern Uplands 71–73, 74 age and geology 158–159 accretionary event, Late Ordovician 80 Arctic Alaska terrane 108, 108, 110 Agdenes detachment 246, 253, 257, 258, 261–263 Arctic Caledonides 93–119 Agder phase 216 phengite eclogites 386–399 Agder Terrane 196 remnants 109–112 correlation 213 Arctida 161, 166–167 albite porphyroblast schist 472, 474 A˚ re area 340, 343 Allochthonous Basement 405 geophysical data 303, 305 allochthonous fold and thrust belt 13–16, 20 proposed drill site 316 oceanic affinity 17–18, 21–22 sample location 323, 323 allochthonous terranes 438 A˚ reskutan Nappe, amphibolite–granulite allochthonous unit 225 355–362 allochthons, Caledonian 3, 160–161, 321 basal thrust 342 Alps (western), cross-section 502 metamorphism, timing 356–357 Altevann, detrital zircon 162–164, 167, 168 metamorphism, ultra high temperature Alum Shale 160, 246, 255, 258, 294, 301, 311, 340 321–334 Amazonia 29 schematic section 348 Amerasian basin 94, 111 SIMS U–Pb zircon geochronology A˚ motsdal Quartzite 246, 255, 256, 261, 265 343–344 amphibole 388 Argyll Group electron microprobe analyses 379, 391, volcanism 77, 78 456, 459 ash beds, geochemistry 177–190 amphibolite 358 Atlantic Ocean titanite/zircon analysis 209 Caledonian orogens 94, 635 amphibolite facies 343 opening 243 geochronology 249–251 augen gneiss 225–227, 230, 231, 235, 252, regression 460–461 253, 255 anatexis 195, 198, 237, 627 concordia diagram 234 Andean-type subduction 46, 502, 504 Autochthon 133–136, 140, 148, 272, 438 andesitic source magma 184, 188, 189 age 437 Annagh Gneiss Complex 54–56 Finnmark Caledonides 296 annite 449, 450, 451, 461 autochthonous basement 13–15, 20, 24, 316 anorthosite 198, 200, 215, 226, 229, 230, 231, 236 Avalonia geochemistry 590 collision 11, 29, 30 anorthosite, mangerite, charnockite, granite suite collision, Laurentia 46, 75–76 445, 448 palaeogeography 12 apatite 429 apatite fission track age 683, 688–691 baddeleyite 404, 407–418 data 684–685 balanced cross-section Ar/Ar age 4, 106, 107, 244, 356, 358, 387 restoration 285–287 Grampian 54, 60 Ballantrae Igneous Complex 64–66, 70, 71 Lofoten islands 446, 447–448, 459–463 Ballantrae Ophiolite 496–497 Tjeliken eclogite 371 Ballybofey Nappe 475 Ar/Ar analyses 451, 455 Baltica method 339–340 accretion 166–167 Ar/Ar data 193 geochemistry, bentonites 177–190 Ar/Ar step-heating spectra 452–454, 457, 460 passive margin 161 arc accretion, Greenland 112 plate boundaries 158 Downloaded from http://pubs.geoscienceworld.org/books/book/chapter-pdf/3918999/9781862396661_backmatter.pdf by guest on 02 October 2021 704 INDEX Baltica (Continued) geology 634–639 rotation 150 provenance 646–648 underthrust 157 tectonic setting 645–646, 649 Baltica–Laurentia 59, 64, 66, 74 Bratten–Landegode granite 640–641 Baltica, collision 46, 75–76, 243, 382 breccia 229–230 Avalonia 11, 29, 30 brittle deformation, dating 697 Bamble-Kongsberg Terrane 195 Buchan zones 58, 59, 472, 474, 477 Barents Sea succession 28, 274 buoyancy 243, 361, 362, 427, 443 Barents Shelf 94, 111 burial 18, 243 Barentsia block 167 Barrovian zones 58, 75, 79, 472, 474, 477, 563 basement 214 calc-alkaline composition 189, 361 allochthonous 16, 17–18 Timanian 161 autochthonous 13–16, 20 Tjeliken eclogite 371 Baltica 246 calc-alkaline granites 188 basement culminations 23 calc-alkaline magmatism 112, 186 basement imbrication 259, 261 calc-silicate psammite, zircon signature basement, Precambrian 195–203 144, 147 bastnesite 428 Caledonian deformation front 111 batholith 603, 604 Caledonian nappes 197–203, 437 bead zircon 414–416, 421 provenance 212–213 zirconium sources 418–419 Caledonian orogenic cycle 45, 46 bedding, stereoplot 283 Caledonian orogeny bentonite 136, 187–189 Devonian–Carboniferous metamorphism geochemistry 177–179, 180, 182–183, 184 117–118 Bergsdalen nappes 199 duration and timing 360 Betusordda Antiformal Stack 279 Ordovician metamorphism 115, 116 Bindal Batholith 603, 604 Ordovician–Silurian arc magmatism 115–117 biotite 343, 344, 358 carbonate 114, 636 A˚ reskutan Nappe 333 carbonatite magma/volcanism 186, 190 biotite composition 179, 184, 187, 188, 189 cathodoluminescence 211 microprobe analysis 326, 327, 329, 330 zircon images 345, 433 whole-rock data 182–183 Central Caledonian Transect 301 Biscayarhalvøya chalcopyrite 230 eclogites 399 channel flow 263 geology 385, 387 charnockite 225–226, 228, 230, 231, 236, 461 Bjørnøya 108 chevron folds 284 tectonic history 109 chitinozoan 475 unconformity 114 chlorite pseudomorph 486, 487 black phyllite 244, 258 Cl in fluids 459, 460 black schist 246, 255, 264 cleavage 72, 76, 471, 478, 479, 489 Helgeland 594, 595, 597 crenulation 75 black shale 16, 17, 21, 160, 245, 305 stereoplot 283 A˚ reskutan Nappe 334, 340, 360, 363 Clew Bay Complex 63, 67, 74 Scandes 133, 135, 136, 139 clinopyroxene 388, 392–397, 429 Scotland/Ireland 60, 62–64 microprobe analyses 377, 390, 391 Southern Uplands 72 clinozoisite 390 blueschist 107, 109, 398, 497, 505 cobbles, meta-igneous 588–589, 590, Scotland–Ireland 59, 64, 66, 74 593–595, 597 Boknfjorden Nappe 202 coesite 249, 264, 332–333, 369, 380, 429 Bolvær Complex 585–599 relict 326 Børsely Duplex 279 collision boudin 446, 449, 451, 455 age 30, 118 eclogite 247, 248, 249 Avalonia, Baltica, Laurentia 75–76 Bouguer gravity anomaly 307–309, 312, 314 Baltica 372 Boundary Slide 472, 499 Baltica–Laurentia 259, 404 Bratten–Landegode gneiss complex 633–650 age 372, 421, 428, 462, 579 geochronology 639–645 A˚ reskutan 337–338, 361–363 Downloaded from http://pubs.geoscienceworld.org/books/book/chapter-pdf/3918999/9781862396661_backmatter.pdf by guest on 02 October 2021 INDEX 705 Arctic area 115 dacitic, source magma 184, 187–189 eclogite facies 398–399 Dala sandstone, zircon signature 140 continental 214 Dalradian Supergroup 54, 57–59, 468–469, Gothian/Telemarkian 237 488–489 Himalayan 1, 29 geochronology 77, 475–478 Scandian 243, 334, 603–604 volcanic activity 78–79 collision, hard 67, 76 Dalsfjord Nappe 198, 213 collision, soft 46, 76 de´collement 259, 309 Collisional Orogeny in the Scandinavian COSC drilling target 303, 305 Caledonides see COSC Deer Park Complex 66 Colonsay Group 57 ophiolites 73 conglomerate 681, 682 deformation deformed 228, 256, 264, 679, 696–697 Espedalen Complex 230 contact, intrusive 611 Finnmark Caledonides 277–285 continental affinity 22–23 Grampian 72–75, 478–480 continental drift 29 Vega complex 605, 608 cooling age 64, 66, 438, 578 deformation and magmatism Arctic areas 100, 107, 387 Greenland 113–114 Lofoten 462–463 deformation and metamorphism 72–75 Seve Nappe 340 geochronology 77 cooling curve, eclogite 448 deformation, polyphase 11, 52, 57–58, 100 cooling history 683–699 Grampian 467, 469, 472, 489, 505 cooling rate 361, 362 dehydration 438 copper mineralization 229–230 CO2 425 cordierite stability 612–613, 615 slab 459 Cordilleran terranes 94, 108, 110–111 dehydration melting 333, 356 corona 436, 438 delamination 213 garnet 382, 388 density 311, 314, 316 metagabbro 410, 412 data 306 rutile 392 depleted mantle 597, 599 texture 429 depositional age, Dividal Group 164 titanomagnetite 411 depositional environment 636 zircon 434 Helgeland Nappe 585, 597–599 correlation, nappes (S Norway) 193 detrital zircon age 3, 596, 599 COSC-1 drill hole 301–317 Uppermost Allochthon 634, 636, 646–648 (Collisional Orogeny in the Scandinavian detrital zircon study, central Scandes 131–151 Caledonides) allochthon 136–139, 140, 144–147, 149 Cretaceous peneplanation 698 analytical methods 139 cross-section autochthon 133–136, 140, 148–149 Leirpollen Butressing Zone 280 concordia plot 142, 143, 146, 147, 163 Morar Group 53 discussion 149–151 Scandinavian Caledonides 25 detrital zircon study, Dividal Group 157–170 crust formation 436 analytical methods 162 crust, thickness 309 geological setting 158–161 crustal anatexis 189, 603–628 results 162–165 crustal evolution 150, 437 samples 158 Sveconorwegian terranes 196 Devonian (Early), thrust and extension crustal imbrication 246, 257 241–265 crustal thickening 193, 213, 214, 438, 627 exhumation 257–263 Arctic areas 117, 119 extensional detachment 251–253, 257 Grampian 504 fabric evolution 246–249 crustal thinning, Permo-Triassic 697 geochronology 249–251 crystalline basement 258, 301, 404, 634 imbrication 257–263 density 307 out-of-sequence thrust 253–257 seismic data 309 time sequence, problems 263–264 crystalline nappe 196, 197, 198 Devonian basins 244 crystalline rocks 223, 227, 244 Devonian detachment 18–19 Cu–Zn deposits 22 Devonian, post-orogenic 679, 696–697 Downloaded from http://pubs.geoscienceworld.org/books/book/chapter-pdf/3918999/9781862396661_backmatter.pdf by guest on 02 October 2021 706 INDEX Devonian, timescale 250 interpretation 235–238 diamictite 103, 107, 110, 281–282 major elements 229 Connemara 473 sedimentary cover 230 Neoproterozoic 97 structure 230–231 diamond 17, 18, 249, 369, 428 tectonostratigraphy 225–231 diatexite 609–613 U–Pb geochronology 231–235 digital elevation model Espedalen Nappe 198, 214, 216 COSC drill site 312 Eurasian Basin, closure 111 diorite, Landegode 645 evaporites, meta- 339 Dividal Group, detrital zircon study 157–170 exhumation 18, 31, 193, 215 dolerite, seismic reflection 309 A˚ reskutan Nappe 332, 334, 356, 361, 362 dolomite 24, 109, 395 fission track study 680 dolostone 273, 275, 295 Lofoten islands 443, 447–448, 462
Load more

Recommended publications
  • From the Early Paleozoic Platforms of Baltica and Laurentia to the Caledonide Orogen of Scandinavia and Greenland
    44 by David G. Gee1, Haakon Fossen2, Niels Henriksen3, and Anthony K. Higgins3 From the Early Paleozoic Platforms of Baltica and Laurentia to the Caledonide Orogen of Scandinavia and Greenland 1 Department of Earth Sciences, Uppsala University, Villavagen Villavägen 16, Uppsala, SE-752 36, Sweden. E-mail: [email protected] 2 Department of Earth Science, University of Bergen, Allégaten 41, N-5007, Bergen, Norway. E-mail: [email protected] 3 The Geological Survey of Denmark and Greenland, Øster Voldgade 10, Dk 1350 Copenhagen, Denmark. E-mail: [email protected], [email protected] The Caledonide Orogen in the Nordic countries is exposed in Norway, western Sweden, westernmost Fin- Introduction land, on Svalbard and in northeast Greenland. In the The Caledonide Orogen is preserved on both sides of the North mountains of western Scandinavia, the structure is dom- Atlantic Ocean, in the mountains of western Scandinavia and north- inated by E-vergent thrusts with allochthons derived eastern Greenland; it continues northwards from northern Norway, across the Barents Shelf and Svalbard to the edge of the Eurasian from the Baltoscandian platform and margin, from out- Basin (Figure 1). The orogen is notable for its thrust systems, board oceanic (Iapetus) terranes and with the highest E-vergent in Scandinavia and W-vergent in Greenland. The width of the orogen, prior to Cenozoic opening of the North Atlantic, was in thrust sheets having Laurentian affinities. The other the order of at least 700–800 km, the deformation fronts on both side of this bivergent orogen is well exposed in north- sides of the orogen being defined by thrusts that, in the Devonian, eastern Greenland, where W-vergent thrust sheets probably reached substantially further onto the foreland platforms than they do today.
    [Show full text]
  • Assembly, Configuration, and Break-Up History of Rodinia
    Author's personal copy Available online at www.sciencedirect.com Precambrian Research 160 (2008) 179–210 Assembly, configuration, and break-up history of Rodinia: A synthesis Z.X. Li a,g,∗, S.V. Bogdanova b, A.S. Collins c, A. Davidson d, B. De Waele a, R.E. Ernst e,f, I.C.W. Fitzsimons g, R.A. Fuck h, D.P. Gladkochub i, J. Jacobs j, K.E. Karlstrom k, S. Lu l, L.M. Natapov m, V. Pease n, S.A. Pisarevsky a, K. Thrane o, V. Vernikovsky p a Tectonics Special Research Centre, School of Earth and Geographical Sciences, The University of Western Australia, Crawley, WA 6009, Australia b Department of Geology, Lund University, Solvegatan 12, 223 62 Lund, Sweden c Continental Evolution Research Group, School of Earth and Environmental Sciences, University of Adelaide, Adelaide, SA 5005, Australia d Geological Survey of Canada (retired), 601 Booth Street, Ottawa, Canada K1A 0E8 e Ernst Geosciences, 43 Margrave Avenue, Ottawa, Canada K1T 3Y2 f Department of Earth Sciences, Carleton U., Ottawa, Canada K1S 5B6 g Tectonics Special Research Centre, Department of Applied Geology, Curtin University of Technology, GPO Box U1987, Perth, WA 6845, Australia h Universidade de Bras´ılia, 70910-000 Bras´ılia, Brazil i Institute of the Earth’s Crust SB RAS, Lermontova Street, 128, 664033 Irkutsk, Russia j Department of Earth Science, University of Bergen, Allegaten 41, N-5007 Bergen, Norway k Department of Earth and Planetary Sciences, Northrop Hall University of New Mexico, Albuquerque, NM 87131, USA l Tianjin Institute of Geology and Mineral Resources, CGS, No.
    [Show full text]
  • Compilation, References, Kimberlite, Diamond
    Ontario Geological Survey Open File Report 6067 A Compilation of References for Kimberlite, Diamond and Related Topics 2001 ONTARIO GEOLOGICAL SURVEY Open File Report 6067 A Compilation of References for Kimberlite, Diamond and Related Topics by R.P. Sage and T. Gareau 2001 Parts of this publication may be quoted if credit is given. It is recommended that reference to this publication be made in the following form: Sage, R.P.and Gareau, T.2001. A compilation of references for kimberlite, diamond and related topics; Ontario Geological Survey, Open File Report 6067, 101p. e Queen’s Printer for Ontario, 2001 e Queen’s Printer for Ontario, 2001. Open File Reports of the Ontario Geological Survey are available for viewing at the Mines Library in Sudbury, at the Mines and Minerals Information Centre in Toronto, and at the regional Mines and Minerals office whose district includes the area covered by the report (see below). Copies can be purchased at Publication Sales and the office whose district includes the area covered by the report. Al- though a particular report may not be in stock at locations other than the Publication Sales office in Sudbury, they can generally be obtained within 3 working days. All telephone, fax, mail and e-mail orders should be directed to the Publica- tion Sales office in Sudbury. Use of VISA or MasterCard ensures the fastest possible service. Cheques or money orders should be made payable to the Minister of Finance. Mines and Minerals Information Centre (MMIC) Tel: (416) 314-3800 Macdonald Block, Room M2-17 1-800-665-4480(toll free inside Ontario) 900 Bay St.
    [Show full text]
  • WEST NORWEGIAN FJORDS UNESCO World Heritage
    GEOLOGICAL GUIDES 3 - 2014 RESEARCH WEST NORWEGIAN FJORDS UNESCO World Heritage. Guide to geological excursion from Nærøyfjord to Geirangerfjord By: Inge Aarseth, Atle Nesje and Ola Fredin 2 ‐ West Norwegian Fjords GEOLOGIAL SOCIETY OF NORWAY—GEOLOGICAL GUIDE S 2014‐3 © Geological Society of Norway (NGF) , 2014 ISBN: 978‐82‐92‐39491‐5 NGF Geological guides Editorial committee: Tom Heldal, NGU Ole Lutro, NGU Hans Arne Nakrem, NHM Atle Nesje, UiB Editor: Ann Mari Husås, NGF Front cover illustrations: Atle Nesje View of the outer part of the Nærøyfjord from Bakkanosi mountain (1398m asl.) just above the village Bakka. The picture shows the contrast between the preglacial mountain plateau and the deep intersected fjord. Levels geological guides: The geological guides from NGF, is divided in three leves. Level 1—Schools and the public Level 2—Students Level 3—Research and professional geologists This is a level 3 guide. Published by: Norsk Geologisk Forening c/o Norges Geologiske Undersøkelse N‐7491 Trondheim, Norway E‐mail: [email protected] www.geologi.no GEOLOGICALSOCIETY OF NORWAY —GEOLOGICAL GUIDES 2014‐3 West Norwegian Fjords‐ 3 WEST NORWEGIAN FJORDS: UNESCO World Heritage GUIDE TO GEOLOGICAL EXCURSION FROM NÆRØYFJORD TO GEIRANGERFJORD By Inge Aarseth, University of Bergen Atle Nesje, University of Bergen and Bjerkenes Research Centre, Bergen Ola Fredin, Geological Survey of Norway, Trondheim Abstract Acknowledgements Brian Robins has corrected parts of the text and Eva In addition to magnificent scenery, fjords may display a Bjørseth has assisted in making the final version of the wide variety of geological subjects such as bedrock geol‐ figures . We also thank several colleagues for inputs from ogy, geomorphology, glacial geology, glaciology and sedi‐ their special fields: Haakon Fossen, Jan Mangerud, Eiliv mentology.
    [Show full text]
  • New Siberian Islands Archipelago)
    Detrital zircon ages and provenance of the Upper Paleozoic successions of Kotel’ny Island (New Siberian Islands archipelago) Victoria B. Ershova1,*, Andrei V. Prokopiev2, Andrei K. Khudoley1, Nikolay N. Sobolev3, and Eugeny O. Petrov3 1INSTITUTE OF EARTH SCIENCE, ST. PETERSBURG STATE UNIVERSITY, UNIVERSITETSKAYA NAB. 7/9, ST. PETERSBURG 199034, RUSSIA 2DIAMOND AND PRECIOUS METAL GEOLOGY INSTITUTE, SIBERIAN BRANCH, RUSSIAN ACADEMY OF SCIENCES, LENIN PROSPECT 39, YAKUTSK 677980, RUSSIA 3RUSSIAN GEOLOGICAL RESEARCH INSTITUTE (VSEGEI), SREDNIY PROSPECT 74, ST. PETERSBURG 199106, RUSSIA ABSTRACT Plate-tectonic models for the Paleozoic evolution of the Arctic are numerous and diverse. Our detrital zircon provenance study of Upper Paleozoic sandstones from Kotel’ny Island (New Siberian Island archipelago) provides new data on the provenance of clastic sediments and crustal affinity of the New Siberian Islands. Upper Devonian–Lower Carboniferous deposits yield detrital zircon populations that are consistent with the age of magmatic and metamorphic rocks within the Grenvillian-Sveconorwegian, Timanian, and Caledonian orogenic belts, but not with the Siberian craton. The Kolmogorov-Smirnov test reveals a strong similarity between detrital zircon populations within Devonian–Permian clastics of the New Siberian Islands, Wrangel Island (and possibly Chukotka), and the Severnaya Zemlya Archipelago. These results suggest that the New Siberian Islands, along with Wrangel Island and the Severnaya Zemlya Archipelago, were located along the northern margin of Laurentia-Baltica in the Late Devonian–Mississippian and possibly made up a single tectonic block. Detrital zircon populations from the Permian clastics record a dramatic shift to a Uralian provenance. The data and results presented here provide vital information to aid Paleozoic tectonic reconstructions of the Arctic region prior to opening of the Mesozoic oceanic basins.
    [Show full text]
  • Balkatach Hypothesis: a New Model for the Evolution of the Pacific, Tethyan, and Paleo-Asian Oceanic Domains
    Research Paper GEOSPHERE Balkatach hypothesis: A new model for the evolution of the Pacific, Tethyan, and Paleo-Asian oceanic domains 1,2 2 GEOSPHERE, v. 13, no. 5 Andrew V. Zuza and An Yin 1Nevada Bureau of Mines and Geology, University of Nevada, Reno, Nevada 89557, USA 2Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, California 90095-1567, USA doi:10.1130/GES01463.1 18 figures; 2 tables; 1 supplemental file ABSTRACT suturing. (5) The closure of the Paleo-Asian Ocean in the early Permian was accompanied by a widespread magmatic flare up, which may have been CORRESPONDENCE: avz5818@gmail .com; The Phanerozoic history of the Paleo-Asian, Tethyan, and Pacific oceanic related to the avalanche of the subducted oceanic slabs of the Paleo-Asian azuza@unr .edu domains is important for unraveling the tectonic evolution of the Eurasian Ocean across the 660 km phase boundary in the mantle. (6) The closure of the and Laurentian continents. The validity of existing models that account for Paleo-Tethys against the southern margin of Balkatach proceeded diachro- CITATION: Zuza, A.V., and Yin, A., 2017, Balkatach hypothesis: A new model for the evolution of the the development and closure of the Paleo-Asian and Tethyan Oceans criti- nously, from west to east, in the Triassic–Jurassic. Pacific, Tethyan, and Paleo-Asian oceanic domains: cally depends on the assumed initial configuration and relative positions of Geosphere, v. 13, no. 5, p. 1664–1712, doi:10.1130 the Precambrian cratons that separate the two oceanic domains, including /GES01463.1. the North China, Tarim, Karakum, Turan, and southern Baltica cratons.
    [Show full text]
  • Sm–Nd and U–Pb Isotope Geochemistry of the Palaeoproterozoic Mafic Magmatism in Eastern and Northern Finland
    Geological Survey of Finland GeologicalGeological SurveySurvey ofof FinlandFinland 2018 Sm–Nd and U–Pb isotope geochemistry of the Palaeoproterozoic mafic magmatism in eastern and northern Finland Hannu Huhma, Eero Hanski, Asko Kontinen, Jouni Vuollo, Irmeli Mänttäri and Yann Lahaye Bulletin 405 • Monograph Geological Survey of Finland, Bulletin The Bulletin of the Geological Survey of Finland publishes the results of scientific research that is thematically or geographically connected to Finnish or Fennoscandian geology, or otherwise related to research and innovation at GTK. Articles by researchers outside GTK are also welcome. All manuscripts are peer reviewed. Editorial Board Prof. Pekka Nurmi, GTK, Chair Dr Stefan Bergman, SGU Dr Asko Käpyaho, GTK Dr Antti Ojala, GTK Dr Timo Tarvainen, GTK, Scientific Editor Instructions for authors available from the Scientific Editor. GEOLOGICAL SURVEY OF FINLAND Bulletin 405 Sm–Nd and U–Pb isotope geochemistry of the Palaeoproterozoic mafic magmatism in eastern and northern Finland by Hannu Huhma, Eero Hanski, Asko Kontinen, Jouni Vuollo, Irmeli Mänttäri and Yann Lahaye Unless otherwise indicated, the figures have been prepared by the authors of the publication. Layout: Elvi Turtiainen Oy Espoo 2018 Huhma, H.1) , Hanski, E.2), Kontinen, A.3), Vuollo, J.4), Mänttäri, I.1) & Lahaye, Y.1) 2018. Sm–Nd and U–Pb isotope geochemistry of the Palaeoproterozoic mafic magmatism in eastern and northern Finland. Geological Survey of Finland, Bulletin 405, 150 pages, 128 figures, 1 table and 11 appendices. The extensive isotopic studies performed at the Geological Survey of Finland (GTK) since the early 1970s have shown that mafic magmas in the Karelia province of the Fennoscandian Shield were emplaced in several stages, including ca.
    [Show full text]
  • Neoproterozoic Metamorphic Evolution of the Isbjørnhamna
    Neoproterozoic metamorphic evolution of the Isbjørnhamna Group rocks from south-western Svalbardpor_186 250..264 Jaroslaw Majka,1 Jerzy Czerny,2 Stanislaw Mazur,3 Daniel K. Holm4 & Maciej Manecki2 1 Department of Earth Sciences, Uppsala University, Villavägen 16, SE-75236 Uppsala, Sweden 2 Department of Mineralogy, Petrography and Geochemistry, AGH–University of Science and Technology, 30 Mickiewicza Av., PL-30059 Kraków, Poland 3 GETECH, Kitson House, Elmete Hall, Elmete Lane, Leeds, LS8 2LJ, UK 4 Department of Geology, Kent State University, Kent, OH 44242, USA Keywords Abstract Caledonides; geothermobarometry; metapelites; Neoproterozoic; Spitsbergen. A metamorphosed volcano-sedimentary complex constitutes the Caledonian basement in the south-western part of Wedel Jarlsberg Land, Svalbard. Field, Correspondence textural and previous thermochronologic data indicate a weak, localized meta- Jaroslaw Majka, Department of Earth morphic Caledonian overprint (M2). Deformed M1 isograds and variation in Sciences, Uppsala University, Villavägen 16, pressure–temperature estimates indicate a pervasive Neoproterozoic SE-75236 Uppsala, Sweden. E-mail: amphibolite-facies metamorphism that pre-dates large-scale Caledonian age [email protected] folding. Garnet–biotite and garnet–Al silicate–plagioclase (GASP) geother- doi:10.1111/j.1751-8369.2010.00186.x mobarometry of the Isbjørnhamna Group mica schists, and their comparison with the K2O–FeO–MgO–Al2O3–SiO2–H2O (KFMASH) petrogenetic grid, indi- cates a peak pressure of ca. 11 kbar, and a peak temperature of ca. 670°C during M1 metamorphism. A cooling rate of ca. 5°C My-1 is estimated on the basis of geothermobarometry and the available U–Th–total Pb and Ar–Ar data. Southern Wedel Jarlsberg Land (Fig.
    [Show full text]
  • A Template for an Improved Rock-Based Subdivision of the Pre-Cryogenian Timescale
    Downloaded from http://jgs.lyellcollection.org/ by guest on September 28, 2021 Perspective Journal of the Geological Society Published Online First https://doi.org/10.1144/jgs2020-222 A template for an improved rock-based subdivision of the pre-Cryogenian timescale Graham A. Shields1*, Robin A. Strachan2, Susannah M. Porter3, Galen P. Halverson4, Francis A. Macdonald3, Kenneth A. Plumb5, Carlos J. de Alvarenga6, Dhiraj M. Banerjee7, Andrey Bekker8, Wouter Bleeker9, Alexander Brasier10, Partha P. Chakraborty7, Alan S. Collins11, Kent Condie12, Kaushik Das13, David A. D. Evans14, Richard Ernst15,16, Anthony E. Fallick17, Hartwig Frimmel18, Reinhardt Fuck6, Paul F. Hoffman19,20, Balz S. Kamber21, Anton B. Kuznetsov22, Ross N. Mitchell23, Daniel G. Poiré24, Simon W. Poulton25, Robert Riding26, Mukund Sharma27, Craig Storey2, Eva Stueeken28, Rosalie Tostevin29, Elizabeth Turner30, Shuhai Xiao31, Shuanhong Zhang32, Ying Zhou1 and Maoyan Zhu33 1 Department of Earth Sciences, University College London, London, UK 2 School of the Environment, Geography and Geosciences, University of Portsmouth, Portsmouth, UK 3 Department of Earth Science, University of California at Santa Barbara, Santa Barbara, CA, USA 4 Department of Earth and Planetary Sciences, McGill University, Montreal, Canada 5 Geoscience Australia (retired), Canberra, Australia 6 Instituto de Geociências, Universidade de Brasília, Brasilia, Brazil 7 Department of Geology, University of Delhi, Delhi, India 8 Department of Earth and Planetary Sciences, University of California, Riverside,
    [Show full text]
  • Tectonic Regimes in the Baltic Shield During the Last 1200 Ma • a Review
    Tectonic regimes in the Baltic Shield during the last 1200 Ma • A review Sven Åke Larsson ' ', Bva-L^na Tuliborq- 1 Department of Geology Chalmers University of Technology/Göteborij U^vjrsivy 2 Terralogica AB November 1993 TECTONIC REGIMES IN THE BALTIC SHIELD DURING THE LAST 1200 Ma - A REVIEW Sven Åke Larsson12, Eva-Lena Tullborg2 1 Department of Geology, Chalmers University of Technology/Göteborg University 2 Terralogica AB November 1993 This report concerns a study which was conducted for SKB. The conclusions and viewpoints presented in the report are those of the author(s) and do not necessarily coincide with those of the client. Information on SKB technical reports from 1977-1978 (TR 121), 1979 (TR 79-28), 1980 (TR 80-26), 1981 (TR 81-17), 1982 (TR 82-28), 1983 (TR 83-77), 1984 (TR 85-01), 1985 (TR 85-20), 1986 (TR 86-31), 1987 (TR 87-33), 1988 (TR 88-32),. 1989 (TR 89-40), 1990 (TR 90-46), 1991 (TR 91-64) and 1992 (TR 92-46) is available through SKB. ) TECTONIC REGIMES IN THE BALTIC SHIELD DURING THE LAST 1200 Ma - A REVIEW by Sven Åke Larson and Eva-Lena Tullborg Department of Geology, Chalmers University of Technology / Göteborg University & Terralogica AB Gråbo, November, 1993 Keywords: Baltic shield, Tectonicregimes. Upper Protero/.oic, Phanerozoic, Mag- matism. Sedimentation. Erosion. Metamorphism, Continental drift. Stress regimes. , ABSTRACT 1 his report is a review about tectonic regimes in the Baltic (Fennoscandian) Shield from the Sveeonorwegian (1.2 Ga ago) to the present. It also covers what is known about palaeostress during this period, which was chosen to include both orogenic and anorogenic events.
    [Show full text]
  • Ages from Determinations of Errorchron Isotopic Age The
    Isotopic age determinations in South Norway: 11. The problem of errorchron ages from Telemark rhyolites. R.H. VERSCHURE, C. MAIJER & P.A.M. ANDRIESSEN Verschure , R.H., Maijer, C. & Andriessen , P.A.M. 1990: Isotopic age determ inations in South Norway: 11. The problem of errorchron ages from Telemark rhyolites . Nor. geol. unders. Bull. 418, 47-60. Two sets of Telemark Supracrustal acid metavolcan ics of the Rjukan Group were investigated by the Rb-Sr whole-rock method. Eleven samples within a sampling range of about 10 m were taken at Kvarnsstel at a distance of about 30 km from the Sveconorwegian reset Telemark Gneisses . This set defines a Sveconorwegian erro rchro n of 0.98 ± 0.05 Ga with an extremely high initial " Sr/" Sr ratio of 0.8049 ± 0.0162 (MSWD = 9.3). The second set was taken from a 1 m thick layer along Vravatn. 1.5 km from the Telemark Gneisses with a sample spacing of about 10 cm. This set defines a pre-Sveconorwegian (Gothian) errorchron of 1.29 ± 0.06 Ga with an initial " Sr/" Sr ratio of 0.7064 ± 0.0036 (MSWD = 13.3). A plot of the Kvamsste l samples in a Hughes igneous spec­ trum diagra m suggests K, and therefo re probably also Rb metasomatism. The high initial " Sr/" Sr ratio might thus provide evidence of Sveconorwegian resetting of volcanics that were metasomat i­ zed in pre-Sveconorwegian, Gothian times. It is not impro bable that the apparent 1.29 ± 0.06 Ga age of the v ravatn samples is a reasonable age appro ximation for the Rjukan Group acid volcanism .
    [Show full text]
  • Ages of Detrital Zircons
    Elsevier Editorial System(tm) for Precambrian Research Manuscript Draft Manuscript Number: Title: AGES OF DETRITAL ZIRCONS (U/Pb, LA-ICP-MS) FROM THE LATEST NEOPROTEROZOIC - MIDDLE CAMBRIAN(?) ASHA GROUP AND EARLY DEVONIAN TAKATY FORMATION, THE SOUTH- WESTERN URALS: A TEST OF AN AUSTRALIA-BALTICA CONNECTION WITHIN RODINIA Article Type: SI:Precambrian Supercontinents Keywords: Urals, Detrital Zircon, Rodinia, Ediacaran, Baltica Corresponding Author: Prof. Nikolay Borisovich Kuznetsov, Ph.D. Corresponding Author's Institution: Geological Institute of Russian Academy of Science First Author: Nikolay B Kuznetsov, Ph.D. Order of Authors: Nikolay B Kuznetsov, Ph.D.; Josef G Meert, Ph.D.; Tatiana V Romanyuk, Ph.D. Abstract: Results from U/Pb-dating of detrital zircons (dZr) from sandstones of the Basu and Kukkarauk Fms. (Asha Group) of Ediacaran-Middle Cambrian(?) age along with the results obtained from the Early Devonian Takaty Fm. are presented. The age of the Asha Group is traditionally labeled as Upper Vendian in the Russian stratigraphic chart that overlaps with the Ediacaran in the International stratigraphic chart. The dZr whose ages fall within the age-interval of (500-750 Ma) are common in the Basu and Kukkarauk Fm. These ages are typical for crystalline complexes in the Pre- Uralides-Timanides orogen. The identification of zircons with this age range agrees with commonly adopted interpretations for the depositional origin of the Asha Group as a molasse resulting from the erosion of that orogenic belt. Based on the estimates of the youngest ages of dZr along with the tentative identification of inarticulate brachiopods in the Kukkarauk Fm., it appears that the upper part of the Asha Group may extend into the Middle Cambrian.
    [Show full text]