DOCSLIB.ORG

Paleomagnetic Studies of the Northern Antarctic Peninsula Jurassic

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Paleomagnetic Studies of the Northern Antarctic Peninsula Jurassic Paleomagnetic studies of the vide necessary information on the ages of magnetization of the sampled units. northern Antarctic Peninsula Certain conclusions may be drawn on the basis of available information (Watts, Bramall, and Watts 1981). The Early Ter- tiary Ezcurra Inlet Group lavas are especially good recorders DOYLE R. WAUS of the paleomagnetic field. The poles derived from these rocks are very similar to Early Tertiary poles predicted for the east Department of Earth Sciences antarctic craton by rotation of well-documented poles from the University, Leeds global data set. This confirms an earlier conclusion (Watts United Kingdom 1981) that either the Antarctic Peninsula has not moved with and respect to the east antarctic craton since the Early Tertiary, or Earth Sciences and Resources Institute that any movement has been a rotation about a pole of spread- University of South Carolina Columbia, South Carolina 29208 ing located approximately at the present geographical pole. Those hypotheses that require a large-scale translation of the Antarctic Peninsula with respect to East Antarctica during the Tertiary may be rejected on the basis of these data. Laboratory studies of oriented core samples collected from the northern Antarctic Peninsula and South Shetland Islands When the age determinations are completed, the northern Antarctic Peninsula polar wander track from the period 120 to during the 1977-78 and 1979-80 field seasons were completed recently at the paleomagnetic laboratory at the University of 40 million years ago will be documented. These data, com- Leeds. The purpose of the investigation is to determine the bined with recent results from the Ellsworth Mountains (Watts direction of the paleomagnetic field with respect to the pen- and Bramall 1981, in press), will reveal aspects of the move- insula for the Mesozoic and Cenozoic. These data are poten- ments of the microcontinents that comprise West Antarctica. This work was supported by National Science Foundation tially useful for determining the motion of this region with DPP DPP 79-21102. respect to other parts of Gondwanaland and testing various grants 77-23427 and hypotheses concerning the interaction of the Antarctic, Pacific, and Indian plates. Measurements of magnetic remanence were made using a References Digico complete results spinner magnetometer and the pro- totype United Kingdom cryogenic magnetometer. Demagne- Watts, D. R. 1981. Potassium-argon and paleomagnetic results from tization experiments were carried out with a tumbler alternat- King George Island, South Shetland Islands. In C. Craddock (Ed.), ing field device and thermal demagnetization apparatus. Antarctic geoscience. Madison: University of Wisconsin Press. A large body of data is now available as characteristic mag- Watts, D. R., and Bramall, A. M. 1981. Palaeomagnetic evidence from netizations have been identified in the Tertiary Ezcurra Inlet the Ellsworth Mountains support microplate nature of western Ant- Group lavas, the Point Hennequin Group lavas, the possibly arctica. Geophysical Journal of the Royal Astronomical Society, 64(4), Mesozoic intrusive rocks from the Danger Islands, Wideopen 271. Watts, D. R., and Bramall, A. M. In press. Upper Cambrian palaeo- Islands, Etna Island, and the igneous rocks from Hope Bay, magnetism of the Ellsworth Mountains: Evidence for a displaced Byers Peninsula, Greenwich Island, and Snow Island. A partial terrain in western Antarctica. Nature. synthesis of these results was read before the Geological Soci- Watts, D. R., Bramall, A. M., and Watts, G. C. 1981. Cainozoic and ety of London in October 1981. The final interpretation awaits Mesozoic(?) palaeomagnetic results from the northern Antarctic the completion of a potassium-argon (K-Ar) age determination Peninsula. Geophysical Journal of the Royal Astronomical Society, program now in progress at the Ohio State University to pro- 64(4), 271. Jurassic-Cretaceous palynology of mian). Apart from recycled specimens, they are the first Tithonian-Barremian palynomorphs reported from Antarctica. Byers Peninsula, Livingston Island, Forty-eight samples collected during the February 1980 Antarctica expedition (P./v Hero cruise 80-2; Elliot and Askin 1980) to Byers Peninsula were examined for palynomorphs. Outcrops of fine- grained sedimentary rocks suitable for palynological study were scarce, and in many cases the sediments were too baked ROSEMARY A. ASKIN by adjacent igneous rocks for preservation of palynomorphs. Ten main localities were sampled, of which localities 2, 4, 6, Department of Geology Colorado School of Mines 9, and 10 (figure) include productive samples. Samples from Golden, Colorado 80401 the other localities are barren of palynomorphs or contain skeletal grains too poorly preserved to identify. The productive samples contain often abundant but poorly Samples from 5 of 10 localities on Byers Peninsula, Livings- preserved spores and pollen (land-plant-derived microfossils) ton Island (figure), contain stratigraphically useful palyno- and dinoflagellates (marine phytoplankton). Among the morph species. The assemblages range in age from possible spores occurring in most samples and identifiable to species uppermost Jurassic (Tithonian) to Lower Cretaceous (Barre- level are the long-ranging species Cyathidites australis Couper, 1981 REVIEW 11 2W 6OW3-: 62°S Two samples from locality 6, Point Smellie, contain amber to brown, though torn and mineral-scarred, palynomorphs. The species Murospora florida (Balme) Pocock (Middle Jurassic- 0\^ Livingston Albian), and long-ranging Classopollis chateaunovi Reyre, Tsu- Island gaepollenites dampen (Balme) Dettmann and T. trilobatus Antarctic 630S (Balme) Dettmann were observed, together with dinoflagel- PeninsuIa ,_.,- lates Fusiformacysta salasii Morgan (early-late Neocomian), A Pareodinia ceratophora Deflandre (?Toarcian-Albian), Batiola- dinium spp., and Canningia spp. The Neocomian age suggested Ocoa Pt by the palynomorphs is in keeping with the Berriasian age derived from ammonites from this locality (figure). Chester Laager Cone Byers Locality 9, approximately 2 kilometers south of Chester Cone ) t J® A Peninsula and between 200 meters and 1 kilometer west of False Cerro Negro, includes a wide area of several small outcrops. The Pt Smeilie outcrops are probably stratigraphically above the beds con- False Cerro 6 B Cerro Negro A taining Covacevichs (1976) Valanginian fauna, 1 to 0.5 kilo- Negro meter to the southwest. Preservation of palynomorphs :® 0 throughout this area is extremely poor. Only 3 samples of 11 e7 El^ contain very corroded spores, pollen, and dinoflagellates. The rest are effectively barren. The productive samples contain Is Pt Cicatnicosisporites australiensis, C. ludbrookii, Appendicisporites sp., and dinoflagellates Batioladinium sp. cf. B. micro podum, Palaeoperidin ium cretaceum Pocock (Hauterivian-Cenoman- Map of Byers Peninsula showing palynology sample localities ian), and Pareodinia ceratophora. From the assemblage com- (numbered circles). The letters show location of fossil invertebrate position it appears that these samples are of late Neocomian faunas data as Tithonian (A), Berriaslan (B), and Valanginian (C) (Hautenvian-Barremian) age. by Gonzalez-Ferran, Katsul, and Tavera (1970), Tavera (1970), Co y -acevich (1976), and Smeille, Davies, and Thomson (1980). Locality 10 includes a nonmanne, mostly volcaniclastic rock section on a ridge southwest of Cerro Negro. Plant megafossils from near the top (eastern part) of this ridge were assigned a C. minor Couper, Stereisporites antiquasporites (Wilson and "Wealden" age by Fuenzalida (1965) and Araya and Hervé Webster) Dettmann, Osmundacidites wellmanii Couper, Bacu- (1966). Hernández and Azcárate (1971) later compared the flora latisporites comaumensis (Cookson) Potonié, and Gleicheniidites to that of the Barremian Baqueró Formation of Santa Cruz circinidites (Cookson) Dettmann. Distribution of a few strati- Province, Argentina. Seven samples from this section contain graphically useful species of palynomorphs is discussed brown spores and pollen grains. The assemblages are domi- below. nated by the distinctive spore Cyatheacidites tectifera Archan- gelsky and Gamerro, which was described from the basal part Locality 2, an approximately 5-meter-thick marine section of the Baqueró Formation (Archangelsky and Gamerro 1965) in a small high valley northeast of Laager Point, includes three of Barremian age (Archangeisky 1967). Preliminary study productive samples. These contain dark brown to black and indicates that this is its only previously reported occurrence. corroded, abundant spores and dinoflagellates, plus uncom- The palynomorph assemblages substantiate the previous mon bisaccate pollen. The assemblages include the spores assignment of a Barremian age to the volcaniclastic beds west Cicatricosisp o rites australiensis (Cookson) Potonié (?Oxfordian- of Cerro Negro. Upper Cretaceous), C. ludbrookii Dettmann (Berriasian- Albian — ranges of spores are for southern continents), and The lack of palynomorph species diagnostic of Aptian or the dinoflagellate cf. Broomea simplex Cookson and Eisenack. younger rocks, together with the absence of any tricolpate The range of Broomea simplex is mid-Kimmeridgian-Tithonian; angiospermous pollen, supports a pre-Aptian age for all these the diagnostic intercalary archeopyle is not visible in the Byers samples. specimens, hence the cf. designation. A tentative Tithonian or Berriasiari age is suggested for this outcrop. This research
Load more

Recommended publications
  • Management Plan for Antarctic Specially Protected Area No 151
    Measure 5 (2019) Management Plan for Antarctic Specially Protected Area No 151 Lions Rump, King George Island, South Shetland Islands Introduction Lions Rump (62º08’S; 58º07’W) is located on the southwestern coast of King George Island, South Shetland Islands, covering approximately 1.32 km2 in area. The Area takes its name from the distinctive rocky hill lying between the southern extremity of King George Bay and Lions Cove. The Area was originally designated as Site of Special Scientific Interest No 34 through Recommendation XVI-2 (1991, SSSI No 34) after a proposal by Poland on the grounds that it contains diverse biota and geological features and is a representative example of the terrestrial, limnological, and littoral habitats of the maritime Antarctic. The Area was designated primarily to protect its ecological values. It is also valuable as a reference site with diverse avian and mammalian Antarctic fauna, against which disturbance at sites situated near locations of human activity can be measured. A revised Management Plan was adopted in Measure 1 (2000). The site was re-designated ASPA No 151 in Decision 1 (2002). A second revised Management Plan was adopted in Measure 11 (2013). Based on the Environmental Domains Analysis for Antarctica (Resolution 3 (2008)) ASPA No 151 lies within Environment A (Antarctic Peninsula northern geologic), which is a small, terrestrial environment around the northern Antarctic Peninsula consisting entirely of ice-free land cover and sedimentary geology (Morgan et al. 2007). Other protected areas containing Domain A include ASPA No 111, ASPA No 128 and ASMA No 1 (Morgan et al.
    [Show full text]
  • Antarctic Primer
    Antarctic Primer By Nigel Sitwell, Tom Ritchie & Gary Miller By Nigel Sitwell, Tom Ritchie & Gary Miller Designed by: Olivia Young, Aurora Expeditions October 2018 Cover image © I.Tortosa Morgan Suite 12, Level 2 35 Buckingham Street Surry Hills, Sydney NSW 2010, Australia To anyone who goes to the Antarctic, there is a tremendous appeal, an unparalleled combination of grandeur, beauty, vastness, loneliness, and malevolence —all of which sound terribly melodramatic — but which truly convey the actual feeling of Antarctica. Where else in the world are all of these descriptions really true? —Captain T.L.M. Sunter, ‘The Antarctic Century Newsletter ANTARCTIC PRIMER 2018 | 3 CONTENTS I. CONSERVING ANTARCTICA Guidance for Visitors to the Antarctic Antarctica’s Historic Heritage South Georgia Biosecurity II. THE PHYSICAL ENVIRONMENT Antarctica The Southern Ocean The Continent Climate Atmospheric Phenomena The Ozone Hole Climate Change Sea Ice The Antarctic Ice Cap Icebergs A Short Glossary of Ice Terms III. THE BIOLOGICAL ENVIRONMENT Life in Antarctica Adapting to the Cold The Kingdom of Krill IV. THE WILDLIFE Antarctic Squids Antarctic Fishes Antarctic Birds Antarctic Seals Antarctic Whales 4 AURORA EXPEDITIONS | Pioneering expedition travel to the heart of nature. CONTENTS V. EXPLORERS AND SCIENTISTS The Exploration of Antarctica The Antarctic Treaty VI. PLACES YOU MAY VISIT South Shetland Islands Antarctic Peninsula Weddell Sea South Orkney Islands South Georgia The Falkland Islands South Sandwich Islands The Historic Ross Sea Sector Commonwealth Bay VII. FURTHER READING VIII. WILDLIFE CHECKLISTS ANTARCTIC PRIMER 2018 | 5 Adélie penguins in the Antarctic Peninsula I. CONSERVING ANTARCTICA Antarctica is the largest wilderness area on earth, a place that must be preserved in its present, virtually pristine state.
    [Show full text]
  • List of Place-Names in Antarctica Introduced by Poland in 1978-1990
    POLISH POLAR RESEARCH 13 3-4 273-302 1992 List of place-names in Antarctica introduced by Poland in 1978-1990 The place-names listed here in alphabetical order, have been introduced to the areas of King George Island and parts of Nelson Island (West Antarctica), and the surroundings of A. B. Dobrowolski Station at Bunger Hills (East Antarctica) as the result of Polish activities in these regions during the period of 1977-1990. The place-names connected with the activities of the Polish H. Arctowski Station have been* published by Birkenmajer (1980, 1984) and Tokarski (1981). Some of them were used on the Polish maps: 1:50,000 Admiralty Bay and 1:5,000 Lions Rump. The sheet reference is to the maps 1:200,000 scale, British Antarctic Territory, South Shetland Islands, published in 1968: King George Island (sheet W 62 58) and Bridgeman Island (Sheet W 62 56). The place-names connected with the activities of the Polish A. B. Dobrowolski Station have been published by Battke (1985) and used on the map 1:5,000 Antarctic Territory — Bunger Oasis. Agat Point. 6211'30" S, 58'26" W (King George Island) Small basaltic promontory with numerous agates (hence the name), immediately north of Staszek Cove. Admiralty Bay. Sheet W 62 58. Polish name: Przylądek Agat (Birkenmajer, 1980) Ambona. 62"09'30" S, 58°29' W (King George Island) Small rock ledge, 85 m a. s. 1. {ambona, Pol. = pulpit), above Arctowski Station, Admiralty Bay, Sheet W 62 58 (Birkenmajer, 1980). Andrzej Ridge. 62"02' S, 58° 13' W (King George Island) Ridge in Rose Peak massif, Arctowski Mountains.
    [Show full text]
  • Federal Register/Vol. 84, No. 78/Tuesday, April 23, 2019/Rules
    Federal Register / Vol. 84, No. 78 / Tuesday, April 23, 2019 / Rules and Regulations 16791 U.S.C. 3501 et seq., nor does it require Agricultural commodities, Pesticides SUPPLEMENTARY INFORMATION: The any special considerations under and pests, Reporting and recordkeeping Antarctic Conservation Act of 1978, as Executive Order 12898, entitled requirements. amended (‘‘ACA’’) (16 U.S.C. 2401, et ‘‘Federal Actions to Address Dated: April 12, 2019. seq.) implements the Protocol on Environmental Justice in Minority Environmental Protection to the Richard P. Keigwin, Jr., Populations and Low-Income Antarctic Treaty (‘‘the Protocol’’). Populations’’ (59 FR 7629, February 16, Director, Office of Pesticide Programs. Annex V contains provisions for the 1994). Therefore, 40 CFR chapter I is protection of specially designated areas Since tolerances and exemptions that amended as follows: specially managed areas and historic are established on the basis of a petition sites and monuments. Section 2405 of under FFDCA section 408(d), such as PART 180—[AMENDED] title 16 of the ACA directs the Director the tolerance exemption in this action, of the National Science Foundation to ■ do not require the issuance of a 1. The authority citation for part 180 issue such regulations as are necessary proposed rule, the requirements of the continues to read as follows: and appropriate to implement Annex V Regulatory Flexibility Act (5 U.S.C. 601 Authority: 21 U.S.C. 321(q), 346a and 371. to the Protocol. et seq.) do not apply. ■ 2. Add § 180.1365 to subpart D to read The Antarctic Treaty Parties, which This action directly regulates growers, as follows: includes the United States, periodically food processors, food handlers, and food adopt measures to establish, consolidate retailers, not States or tribes.
    [Show full text]
  • Jurassic-Cretaceous Tectonic and Depositional Evolution of the Forearc
    International Geology Review ISSN: 0020-6814 (Print) 1938-2839 (Online) Journal homepage: https://tandfonline.com/loi/tigr20 The Byers Basin: Jurassic-Cretaceous tectonic and depositional evolution of the forearc deposits of the South Shetland Islands and its implications for the northern Antarctic Peninsula Joaquin Bastias, Mauricio Calderón, Lea Israel, Francisco Hervé, Richard Spikings, Robert Pankhurst, Paula Castillo, Mark Fanning & Raúl Ugalde To cite this article: Joaquin Bastias, Mauricio Calderón, Lea Israel, Francisco Hervé, Richard Spikings, Robert Pankhurst, Paula Castillo, Mark Fanning & Raúl Ugalde (2019): The Byers Basin: Jurassic-Cretaceous tectonic and depositional evolution of the forearc deposits of the South Shetland Islands and its implications for the northern Antarctic Peninsula, International Geology Review, DOI: 10.1080/00206814.2019.1655669 To link to this article: https://doi.org/10.1080/00206814.2019.1655669 View supplementary material Published online: 21 Aug 2019. Submit your article to this journal View related articles View Crossmark data Full Terms & Conditions of access and use can be found at https://tandfonline.com/action/journalInformation?journalCode=tigr20 INTERNATIONAL GEOLOGY REVIEW https://doi.org/10.1080/00206814.2019.1655669 ARTICLE The Byers Basin: Jurassic-Cretaceous tectonic and depositional evolution of the forearc deposits of the South Shetland Islands and its implications for the northern Antarctic Peninsula Joaquin Bastias a,b, Mauricio Calderónc, Lea Israela, Francisco Hervéa,c, Richard
    [Show full text]
  • Antarctic Treaty Handbook
    Annex Proposed Renumbering of Antarctic Protected Areas Existing SPA’s Existing Site Proposed Year Annex V No. New Site Management Plan No. Adopted ‘Taylor Rookery 1 101 1992 Rookery Islands 2 102 1992 Ardery Island and Odbert Island 3 103 1992 Sabrina Island 4 104 Beaufort Island 5 105 Cape Crozier [redesignated as SSSI no.4] - - Cape Hallet 7 106 Dion Islands 8 107 Green Island 9 108 Byers Peninsula [redesignated as SSSI no. 6] - - Cape Shireff [redesignated as SSSI no. 32] - - Fildes Peninsula [redesignated as SSSI no.5] - - Moe Island 13 109 1995 Lynch Island 14 110 Southern Powell Island 15 111 1995 Coppermine Peninsula 16 112 Litchfield Island 17 113 North Coronation Island 18 114 Lagotellerie Island 19 115 New College Valley 20 116 1992 Avian Island (was SSSI no. 30) 21 117 ‘Cryptogram Ridge’ 22 118 Forlidas and Davis Valley Ponds 23 119 Pointe-Geologic Archipelago 24 120 1995 Cape Royds 1 121 Arrival Heights 2 122 Barwick Valley 3 123 Cape Crozier (was SPA no. 6) 4 124 Fildes Peninsula (was SPA no. 12) 5 125 Byers Peninsula (was SPA no. 10) 6 126 Haswell Island 7 127 Western Shore of Admiralty Bay 8 128 Rothera Point 9 129 Caughley Beach 10 116 1995 ‘Tramway Ridge’ 11 130 Canada Glacier 12 131 Potter Peninsula 13 132 Existing SPA’s Existing Site Proposed Year Annex V No. New Site Management Plan No. Adopted Harmony Point 14 133 Cierva Point 15 134 North-east Bailey Peninsula 16 135 Clark Peninsula 17 136 North-west White Island 18 137 Linnaeus Terrace 19 138 Biscoe Point 20 139 Parts of Deception Island 21 140 ‘Yukidori Valley’ 22 141 Svarthmaren 23 142 Summit of Mount Melbourne 24 118 ‘Marine Plain’ 25 143 Chile Bay 26 144 Port Foster 27 145 South Bay 28 146 Ablation Point 29 147 Avian Island [redesignated as SPA no.
    [Show full text]
  • Byers Peninsula, Livingston Island, South Shetland Islands 1
    From Measure 1 (2002) Management Plan for Antarctic Specially Protected Area No. 126 BYERS PENINSULA, LIVINGSTON ISLAND, SOUTH SHETLAND ISLANDS 1. Description of values to be protected Byers Peninsula (latitude 62°34’35" S, longitude 61°13’07" W, 60.6 km2), Livingston Island, South Shetland Islands, was originally designated as Specially Protected Area (SPA) No. 10 through Recommendation IV-10 in 1966. This area included the ice-free ground west of the western margin of the permanent ice sheet on Livingston Island, below Rotch Dome, as well as Window Island about 500 m off the northwest coast and five small ice-free areas on the south coast immediately to the east of Byers Peninsula. Values protected under the original designation included the diversity of plant and animal life, many invertebrates, a substantial population of southern elephant seals (Mirounga leonina), small colonies of Antarctic fur seals (Arctocephalus gazella), and the outstanding scientific interest associated with such a large variety of plants and animals within a relatively small area. Designation as an SPA was terminated through Recommendation VIII-2 and redesignation as a Site of Special Scientific Interest (SSSI) was made through Recommendation VIII-4 (1975, SSSI No. 6). The new designation as an SSSI more specifically sought to protect three smaller ice-free sites on the peninsula of Jurassic and Cretaceous sedimentary and fossiliferous strata, considered of outstanding scientific value for study of the former link between Antarctica and other southern continents. Following a proposal by Chile and the United Kingdom, the SSSI was subsequently extended through Recommendation XVI-5 (1991) to include boundaries similar to those of the original SPA: i.e.
    [Show full text]
  • Federal Register/Vol. 70, No. 218/Monday, November 14, 2005
    69098 Federal Register / Vol. 70, No. 218 / Monday, November 14, 2005 / Rules and Regulations * * * * * unless authorized by permit as well as hereby designated as Antarctic Specially [FR Doc. 05–22466 Filed 11–10–05; 8:45 am] the ACA’s blanket prohibition on Protected Areas (ASPA). The Antarctic BILLING CODE 6560–50–P damaging, removing or destroying a Conservation Act of 1978, as amended, Historic Site or Monument. No public prohibits, unless authorized by a permit, comment is needed the addition of these any person from entering or engaging in NATIONAL SCIENCE FOUNDATION areas or sites merely implements activities within an ASPA. Detailed measures adopted by the Treaty Parties maps and descriptions of the sites and 45 CFR Part 670 at various ATCM meetings. complete management plans can be Finally, these amendments correct obtained from the National Science Conservation of Antarctic Animals and typographical errors in the names and Foundation, Office of Polar Programs, Plants numerical listings of several specially National Science Foundation, Room protected areas previously published in AGENCY: National Science Foundation. 755, 4201 Wilson Boulevard, Arlington, § 670.29. Virginia 22230. ACTION: Direct final rule. Determinations ASPA 101 Taylor Rookery, Mac. SUMMARY: Pursuant to the Antarctic NSF has determined, under the Robertson Land, East Antarctica Conservation Act of 1978, The National ASPA 102 Rookery Islands, Holme criteria set forth in Executive Order Science Foundation (NSF) is amending Bay, Mac. Robertson Land, East 12866, that this rule is not a significant its regulations to designate additional Antarctica regulatory action requiring review by Antarctic Specially Protected Areas ASPA 103 Ardery Island and Odbert the Office of Management and Budget.
    [Show full text]
  • The Byers Basin: Jurassic-Cretaceous Tectonic And
    International Geology Review ISSN: 0020-6814 (Print) 1938-2839 (Online) Journal homepage: https://www.tandfonline.com/loi/tigr20 The Byers Basin: Jurassic-Cretaceous tectonic and depositional evolution of the forearc deposits of the South Shetland Islands and its implications for the northern Antarctic Peninsula Joaquin Bastias, Mauricio Calderón, Lea Israel, Francisco Hervé, Richard Spikings, Robert Pankhurst, Paula Castillo, Mark Fanning & Raúl Ugalde To cite this article: Joaquin Bastias, Mauricio Calderón, Lea Israel, Francisco Hervé, Richard Spikings, Robert Pankhurst, Paula Castillo, Mark Fanning & Raúl Ugalde (2019): The Byers Basin: Jurassic-Cretaceous tectonic and depositional evolution of the forearc deposits of the South Shetland Islands and its implications for the northern Antarctic Peninsula, International Geology Review, DOI: 10.1080/00206814.2019.1655669 To link to this article: https://doi.org/10.1080/00206814.2019.1655669 View supplementary material Published online: 21 Aug 2019. Submit your article to this journal Article views: 66 View related articles View Crossmark data Full Terms & Conditions of access and use can be found at https://www.tandfonline.com/action/journalInformation?journalCode=tigr20 INTERNATIONAL GEOLOGY REVIEW https://doi.org/10.1080/00206814.2019.1655669 ARTICLE The Byers Basin: Jurassic-Cretaceous tectonic and depositional evolution of the forearc deposits of the South Shetland Islands and its implications for the northern Antarctic Peninsula Joaquin Bastias a,b, Mauricio Calderónc, Lea Israela,
    [Show full text]
  • Waba Directory 2003
    DIAMOND DX CLUB www.ddxc.net WABA DIRECTORY 2003 1 January 2003 DIAMOND DX CLUB WABA DIRECTORY 2003 ARGENTINA LU-01 Alférez de Navió José María Sobral Base (Army)1 Filchner Ice Shelf 81°04 S 40°31 W AN-016 LU-02 Almirante Brown Station (IAA)2 Coughtrey Peninsula, Paradise Harbour, 64°53 S 62°53 W AN-016 Danco Coast, Graham Land (West), Antarctic Peninsula LU-19 Byers Camp (IAA) Byers Peninsula, Livingston Island, South 62°39 S 61°00 W AN-010 Shetland Islands LU-04 Decepción Detachment (Navy)3 Primero de Mayo Bay, Port Foster, 62°59 S 60°43 W AN-010 Deception Island, South Shetland Islands LU-07 Ellsworth Station4 Filchner Ice Shelf 77°38 S 41°08 W AN-016 LU-06 Esperanza Base (Army)5 Seal Point, Hope Bay, Trinity Peninsula 63°24 S 56°59 W AN-016 (Antarctic Peninsula) LU- Francisco de Gurruchaga Refuge (Navy)6 Harmony Cove, Nelson Island, South 62°18 S 59°13 W AN-010 Shetland Islands LU-10 General Manuel Belgrano Base (Army)7 Filchner Ice Shelf 77°46 S 38°11 W AN-016 LU-08 General Manuel Belgrano II Base (Army)8 Bertrab Nunatak, Vahsel Bay, Luitpold 77°52 S 34°37 W AN-016 Coast, Coats Land LU-09 General Manuel Belgrano III Base (Army)9 Berkner Island, Filchner-Ronne Ice 77°34 S 45°59 W AN-014 Shelves LU-11 General San Martín Base (Army)10 Barry Island in Marguerite Bay, along 68°07 S 67°06 W AN-016 Fallières Coast of Graham Land (West), Antarctic Peninsula LU-21 Groussac Refuge (Navy)11 Petermann Island, off Graham Coast of 65°11 S 64°10 W AN-006 Graham Land (West); Antarctic Peninsula LU-05 Melchior Detachment (Navy)12 Isla Observatorio
    [Show full text]
  • Download This PDF File
    POLSKA AKADEMIA NAUK . KOMITET NAUK GEOLOGICZNYCH acta geologica flAlIIsTWOWE WYDAWNICTWO NAUKOWE. WARSZAWA polonica Vol. 35, No. 1-2 Warszawa 1 985 KRZYSzrOF BIRKENMAJER Onset of Tertiary continental glaciation in the Antarctic Peninsula sector (West Antarctica) ABSTRACT: At the close of the Cretaceous, the Antarctic Peninsula sector had a rather warm and dry climate, differentiated into summer and winter seasons, as indicated by annual growth­ -rings in petrified logs. Vegetation cover was probably patchy due to low amount of precipitation. -There is no indication of contemporaneous continental glaciation, however small ice-caps may have grown on tops of stratovolcanoes and in high mountain groups. The Early Tertiary saw climatic and environmental conditions initially similar to the precedent -ones. Increase in amount of rainfall with time resulted in wide spreading of vegetation cover, with Nothofagus forests rich in fern undergrowth, including tree ferns, and with Araucaria, during Pala­ -eocene and Eocene, followed by Nothofagus-podocarp forests poorer in fern undergrowth during Oligocene. Climatic seasonality is well marked in petrified wood logs as annual growth-rings. Ter­ restrial animaI life (marsupials, large birds) is recorded at the beginning of PaIaeogene. There is no indication of continental glaciation in the Antarctic Peninsula sector during the whole Palaeogene. The uppermost Oligocene plant-bearing beds (dated at about 24.5 Ma) still evidence a non-glacial -climate. There are, however, evidences from lahar-type debris-flow agglomerates of existence of local ice-caps on tops of stratovolcanoes. The onset of continental glaciation (ice-sheet at sea level) in the Antarctic Peninsula sector, :slightly post-dates the Oligocene/Miocene boundary.
    [Show full text]
  • Federal Register/Vol. 70, No. 218/Monday, November 14, 2005
    69100 Federal Register / Vol. 70, No. 218 / Monday, November 14, 2005 / Rules and Regulations HSM 47 Buildings on I˘le des Pe´trels, HSM 76 Ruins of base ‘‘Pedro Aguirre Dated: November 4, 2005. Terre Ade´lie Cerda’’, Pendulum Cove, Deception Gerald Zaffos, HSM 48 Cross on ˘Ile des Pe´trels, Terre Island Director, Contract Policy Division. Ade´lie HSM 77 Cape Denison, Federal Acquisition Circular HSM 49 Pillar at Bunger Hill, Queen Commonwealth Bay, George V Land Mary Land Federal Acquisition Circular (FAC) HSM 50 Plaque at Fildes Peninsula, HSM 78 Memorial Plaque at India Point, Humboldt Mountains, 2005-06 Correction is issued under the King George Island, South Shetland authority of the Secretary of Defense, Islands Wohlthat Massif, central Dronning Maud Land the Administrator of General Services, HSM 51 Grave and cross at Admiralty and the Administrator for the National Bay, King George Island, South HSM 79 Lilie Marleen Hut, Mt. Aeronautics and Space Administration. Shetland Islands Dockery, Everett Range, Northern HSM 52 Monolith at Fildes Peninsula, Victoria Land Unless otherwise specified, all Federal Acquisition Regulation (FAR) King George Island, South Shetland HSM 80 Amundsen’s Tent Islands and other directive material contained HSM 53 Monolith and plaques on [FR Doc. 05–22545 Filed 11–10–05; 8:45 am] in FAC 2005-06 Correction are effective Elephant Island, South Shetland BILLING CODE 7555–01–M November 14, 2005. Islands Dated: November 4, 2005. HSM 54 Bust on Ross Island Domenic C. Cipicchio, HSM 55 Buildings and artifacts on DEPARTMENT OF DEFENSE Acting Director, Defense Procurement and Stonington Island, Marguerite Bay, Acquisition Policy.
    [Show full text]