Open-File Report No. Neigc16c:A2
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Tectono-Metamorphic Evolution and Timing of The
TECTONO-METAMORPHIC EVOLUTION AND TIMING OF THE MELTING PROCESSES IN THE SVECOFENNIAN TONALITE-TRONDHJEMITE MIGMATITE BELT: AN EXAMPLE FROM LUOPIOINEN, TAMPERE AREA, SOUTHERN FINLAND H. MOURI, K. KORSMÄN and H. HUHMA MOURI, H., KORSMAN, K. and HUHMA. H. 1999. Tectono-metamorphic evolution and timing of the melting processes in the Svecofennian Tonalite- Trondhjemite Migmatite Belt: An example from Luopioinen, Tampere area, southern Finland. Bulletin of the Geological Society of Finland 71, Part 1, 31- 56. The Svecofennian Orogen is in southern Finland characterized by two major migmatite belts. These are the so-called Granite Migmatite Belt, in which Kfs- rich leucosomes predominate, and the Tonalite-Trondhjemite Migmatite Belt, which is characterized by Kfs-poor leucosomes and borders the former belt in the north. The present paper deals with selected migmatitic rocks from the lat- ter belt. It is aimed to study the temporal and structural relationships of the dif- ferent leucosome generations, and to establish the pressure-temperature-time paths of this belt. The Tonalite-Trondhjemite Migmatite Belt consists mainly of migmatitic rocks with various types of synorogenic granitoids and minor mafic and ultramafic rocks. The mesosome of the migmatites consist of garnet-sillimanite-biotite-pla- gioclase-cordierite-quartz assemblages with rare K-feldspar and late andalusite. The oldest leucosomes are dominated by plagioclase and quartz, and the con- tent of K-feldspar increases in later leucosomes. Microtextural analysis in con- junction with THERMOCALC calculations and geothermometry shows that these rocks were metamorphosed at peak conditions of 700-750°C at 4-5 kbar and aH,0 = 0.4-0.7. -
Field Trip Guide: a Profile from Migmatites to Spodumene Pegmatites (Styria, Austria) 1-29
ZOBODAT - www.zobodat.at Zoologisch-Botanische Datenbank/Zoological-Botanical Database Digitale Literatur/Digital Literature Zeitschrift/Journal: Berichte der Geologischen Bundesanstalt Jahr/Year: 2019 Band/Volume: 134 Autor(en)/Author(s): Schuster Ralf, Knoll Tanja, Mali Heinrich, Huet Benjamin, Griesmeier Gerit E. U. Artikel/Article: Field trip guide: A profile from migmatites to spodumene pegmatites (Styria, Austria) 1-29 Field trip guide: A profile from migmatites to spodumene pegmatites (Styria, Austria) 7th April 2019 St. Radegund, Austria RALF SCHUSTER, TANJA KNOLL, HEINRICH MALI, BENJAMIN HUET & GERIT E.U. GRIESMEIER Berichte der Geologischen Bundesanstalt, 134 ISSN 1017-8880 Field trip guide: A profile from migmatites to spodumene pegmatites (Styria, Austria) Ralf Schuster, Tanja Knoll, Heinrich Mali, Benjamin Huet & Gerit E.U. Griesmeier Ralf Schuster, Tanja Knoll, Benjamin Huet & Gerit E.U. Griesmeier: Geologische Bundesanstalt, Neulinggasse 38, 1030 Vienna, Austria. Heinrich Mali: Montanuniversität Leoben, Department Applied Geosciences and Geophysics, Peter-Tunner-Straße 5, 8700 Leoben Recommended citation / Zitiervorschlag Schuster, R., Knoll, T., Mali, H., Huet, B. & Griesmeier, G.E.U. (2019): Field trip guide: A profile from migmatites to spodumene pegmatites (Styria, Austria). – Berichte der Geologischen Bundesanstalt, 134, 29 p., Vienna. Cover design: Monika Brüggemann-Ledolter (Geologische Bundesanstalt). Cover pictures: Spodumene pegmatite at Garrach (Styria, Austria) (upper picture: Christine Hörfarter, lower picture: Ralf Schuster) Wien, November 2019 Alle Rechte für das In- und Ausland vorbehalten. © Geologische Bundesanstalt, Wien Technische Redaktion: Christoph Janda Medieninhaber, Herausgeber und Verleger: Geologische Bundesanstalt, Wien Neulinggasse 38, 1030 Wien www.geologie.ac.at Druck: Riegelnik Ges.m.b.H, Piaristengasse 17–19, 1080 Wien Ziel der „Berichte der Geologischen Bundesanstalt“ ist die Verbreitung wissenschaftlicher Ergebnisse durch die Geologische Bundesanstalt. -
Geochemistry and Genesis of Beryl Crystals in the LCT Pegmatite Type, Ebrahim-Attar Mountain, Western Iran
minerals Article Geochemistry and Genesis of Beryl Crystals in the LCT Pegmatite Type, Ebrahim-Attar Mountain, Western Iran Narges Daneshvar 1 , Hossein Azizi 1,* , Yoshihiro Asahara 2 , Motohiro Tsuboi 3 , Masayo Minami 4 and Yousif O. Mohammad 5 1 Department of Mining Engineering, Faculty of Engineering, University of Kurdistan, Sanandaj 66177-15175, Iran; [email protected] 2 Department of Earth and Environmental Sciences, Graduate School of Environmental Studies, Nagoya University, Nagoya 464-8601, Japan; [email protected] 3 Department of Applied Chemistry for Environment, School of Biological and Environmental Sciences, Kwansei Gakuin University, Sanda 669-1337, Japan; [email protected] 4 Division for Chronological Research, Institute for Space-Earth Environmental Research, Nagoya University, Nagoya 464-8601, Japan; [email protected] 5 Department of Geology, College of Science, Sulaimani University, Sulaimani 46001, Iraq; [email protected] * Correspondence: [email protected]; Tel.: +98-918-872-3794 Abstract: Ebrahim-Attar granitic pegmatite, which is distributed in southwest Ghorveh, western Iran, is strongly peraluminous and contains minor beryl crystals. Pale-green to white beryl grains are crystallized in the rim and central parts of the granite body. The beryl grains are characterized by low contents of alkali oxides (Na2O = 0.24–0.41 wt.%, K2O = 0.05–0.17 wt.%, Li2O = 0.03–0.04 wt.%, Citation: Daneshvar, N.; Azizi, H.; and Cs2O = 0.01–0.03 wt.%) and high contents of Be2O oxide (10.0 to 11.9 wt.%). The low contents Asahara, Y.; Tsuboi, M.; Minami, M.; of alkali elements (oxides), low Na/Li (apfu) ratios (2.94 to 5.75), and variations in iron oxide Mohammad, Y.O. -
The Garnet Line in Oxford County, Maine Pegmatites
University of New Orleans ScholarWorks@UNO University of New Orleans Theses and Dissertations Dissertations and Theses Fall 12-18-2014 The Garnet Line in Oxford County, Maine Pegmatites. Myles Mathew Felch The University of New Orleans, [email protected] Myles M. Felch [email protected] Follow this and additional works at: https://scholarworks.uno.edu/td Part of the Geology Commons Recommended Citation Felch, Myles Mathew and Felch, Myles M., "The Garnet Line in Oxford County, Maine Pegmatites." (2014). University of New Orleans Theses and Dissertations. 1915. https://scholarworks.uno.edu/td/1915 This Thesis is protected by copyright and/or related rights. It has been brought to you by ScholarWorks@UNO with permission from the rights-holder(s). You are free to use this Thesis in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights- holder(s) directly, unless additional rights are indicated by a Creative Commons license in the record and/or on the work itself. This Thesis has been accepted for inclusion in University of New Orleans Theses and Dissertations by an authorized administrator of ScholarWorks@UNO. For more information, please contact [email protected]. The Garnet Line in Oxford County, Maine Pegmatites. A Thesis Submitted to the Graduate Faculty of the University of New Orleans in partial fulfillment of the requirements for the degree of Master of Science in Earth and Environmental Sciences By Myles Felch B.A., University of Maine at Farmington, 2012 December 2014 © 2014, Myles M. -
Migmatites & Their Origin
MIGMATITES & THEIR ORIGIN PAPER- METAMORPHIC PETROLOGY PAPER CODE- MGELCC-7, SEMESTER- 2ND PREPARED BY: Dr. K. Bijendra Pratap Rahi. Guest Assistant Professor Department of Geology Patna University, Patna E mail ID- [email protected] MOBILE NO- 8789608216 • Definition: • Sederholm (1908) introduced the term migmatite to designate certain gneissic rocks “which look like mixed rocks”. • Coarse grained, heterogeneous and megascopically composite rocks, comprising portions of granitic material (quartz + feldspar) called leucosome, and dark coloured portions of the metamorphic rocks containing mafic minerals, e.g., biotite, garnet, sillimanite, cordierite etc., which is called melanosome. • lit-par-lit gneiss, composite gneiss, injection gneiss etc. • Field relations and Occurrence: • Migmatites are associated with metamorphic rocks of the highest temperature part of the amphibolite facies and granulite facies. • “One of the most firmly established facts in metamorphic geology is the close association in field of highest grade metamorphic rocks and migmatites” Read (1957) • This worldwide observation suggests that the spatial association of these rocks is due to processes occurring at similar temperature and pressure conditions in the deeper part of the crust and giving rise to high-grade metamorphic rocks and migmatites. • The origin of migmatites in deep seated parts of orogenic belts must be considered as directly connected with high-grade metamorphism. Origin of migmatites in light of experimental work: • Shales and greywackes are common sediments deposited in a geosyncline. • The metamorphism of these sediments was experimentally investigated by Winkler and his coworkers. • The experimental anatexis of quartz-albite-K- feldspar (granite) system was investigated by Tuttle and Bowen(1958) and their data are plotted in Fig.1. -
The Maine Geologist
The Maine Geologist NEWSLETTER OF THE GEOLOGICAL SOCIETY OF MAINE June 2018 Volume 44 Number 2 PRESIDENT’S MESSAGE We have earned an enjoyable Maine summer! think about how you might respond to her invitation This edition of The Maine Geologist is packed with in this Newsletter. reports of how busy we were this spring. The GSM Also in the Newsletter, you will find an update Spring Meeting at Unity College was a wonderful on the Anderson Fund Committee, which is excited success, with a full afternoon of student research about increasing the capacity of GSM to fund new presentations from eight schools across Maine. The initiatives in geoscience education in Maine. That abstracts are printed below for you to ponder at your committee has been working hard and will continue leisure. I marvel at how the curiosity of students and to meet over the summer. their advisors leads them to investigate not only I am especially grateful for the work of the distant places, but also their own neighborhoods. We Executive Council, who I have called upon more heard about geology from across four continents as than usual this spring. Sarah stepped up to run the well as from beneath the campus where we were Spring Meeting in my absence, which she did gathered. beautifully, Bruce has done a significant amount of I especially want to mention Alex Bloomer as an financial research related to the dues issue and the example of how geoscience education is happening Anderson Fund, and I have sent Amber scrambling in new ways. Alex is a student at Bangor High after web site upgrade information. -
Geochemical Characterization of Migmatites in Funtua Sheet 78 North-East, Scale 1:50,000 North Western Nigeria
International Journal of Innovative Research in Education, Technology & Social Strategies p-ISSN: 2465-7298 | e-ISSN: 2467-8163 IJIRETSS Volume 7, Number 1 February, 2020 Geochemical Characterization of Migmatites in Funtua Sheet 78 North-East, Scale 1:50,000 North Western Nigeria 1Kankara, I. A. & 2Galadanchi, K. M. 1Department of Geology, Federal University Dutsin-Ma 2Department of Chemistry, Umaru Musa Yar'adua University, Katsina A b s t r a c t n this present study detailed chemical analyses for major and trace elements were done on a total of 20 samples of the rocks investigated using the AAS, IXRF and FP (Flame Photometry) The study area is shown to extend into the north western areas of northern Nigeria and even beyond. The age of D1 and D2 deformations and metamorphisms in the FTNE is therefore shown to be Pan- African. At least two geotectonic episodes or intense phases of ductile deformation were identified in the field to have affected the rocks. The rocks have been strongly foliated with crystals showing strong preferred orientations. Fresh and partly weathered rocks exhibited on the extent and effects of wall-rock alterations that must have accompanied the Pan-African orogeny. The harmonized Analytical results showed that the rocks are saturated with respect to silica, and contain moderate to elevated concentrations of Al2O3, comparable to most pelitic rocks. There appears to be no consistency in the relative concentration of Alkalis in the rocks, and this possibly indicates a mixed nature of the source materials. Both MgO and CaO compositions portray sedimentary character of the protoliths of the rocks. -
Gneiss/ Migmatite (ID:052) GEOLOGICAL CLASSIFICATION (Genetic Classification) Introductory Gneiss: This Rock Is a Gneiss of Banded Colours
Gneiss/ Migmatite (ID:052) GEOLOGICAL CLASSIFICATION (Genetic classification) Introductory Gneiss: This rock is a gneiss of banded colours. The lightest-colored part of rock definition (visu) corresponds to quartz and feldspars whereas whereas the darker part contains to biotite. Mig: This rock is a migmatite of banded colours. The lightest-colored part of migmatite corresponds to quartz and feldspars whereas the darker part contains to biotite. Petrologist's Gneiss: This rock is a gneiss. This banded rock present lightest-colored quartz and definition feldspars with fine to medium crystal size (0.5-1mm) whereas whereas the darker part contains to biotite of fine size. Mig: This rock is a migmatite, which is a mixture of metamorphic rock and igneous rock. It is created when a metamorphic rock that partially melts, and then that melt recrystallizes into an igneous rock, creating a mixture of the unmelted metamorphic part with the recrystallized igneous part. The lightest-colored part of migmatite (quartz and feldspars) was partially melted whereas the darker part (biotites) remnants of the more or less unmodified parent rock. Quartz and feldspars presents a fine to medium crystal size (0.5-1mm) and bioites have a fine size. Commercial In the Natural Stone Industry, this rock is known as Black Swell. definition (if any) GEOMECHANICAL CLASSIFICATION (Behavioural classification, Goodman, 1989) II. Clastic texture A. Stably cemented. DESCRIPTION OF LOCAL SAMPLE Geological Not available description of local sample Other information Not available about the outcrop Weathering grade of Not available sampling outcrop (ISRM, 1981) Location Not available ENGINEERING CLASSIFICATION OF INTACT ROCKS (General classification) ISRM classification R0 R1 R2 R3 R4 R5 R6 by strength. -
Explanatory Notes for the Time–Space Diagram and Stratotectonic Elements Map of Tasmania
Tasmanian Geological Survey TASMANIA DEVELOPMENT Record 1995/01 AND RESOURCES Tasgo NGMA Project Sub-Project 1: Geological Synthesis Explanatory notes for the Time–Space Diagram and Stratotectonic Elements Map of Tasmania by D. B. Seymour and C. R. Calver Tasmanian Geological Survey Record 1995/01 1 CONTENTS INTRODUCTION ..................................................................................................................... 4 KING ISLAND.......................................................................................................................... 5 ?Mesoproterozoic ............................................................................................................... 5 Neoproterozoic orogenesis and granitoid intrusive rocks ................................................ 5 ?Neoproterozoic sequences ................................................................................................ 5 Early Carboniferous granitoid intrusive rocks ................................................................ 6 ROCKY CAPE ELEMENT....................................................................................................... 7 ?Mesoproterozoic: Rocky Cape Group ............................................................................... 7 Burnie and Oonah Formations ........................................................................................ 7 Smithton Synclinorium .................................................................................................... 7 Ahrberg Group ................................................................................................................. -
Shorter Contributions to C*L Y •
Shorter Contributions to C*L y • GEOLOGICAL Shorter Contributions to Mineralogy and Petrology, 1979 The Vermilion Granitic Complex—A New Name for Old Rocks in Northern Minnesota By D. L. SOUTHWICK and P. K. SIMS Potassium-Argon Ages from the Mount Taylor Volcanic Field, New Mexico By PETER W. LIPMAN and HARALD H. MEHNERT Crystals of Coexisting Alunite and Jarosite, Goldfield, Nevada By WILLIAM J. KEITH, LEWIS CALK, and R. P. ASHLEY Zeolitization of Tertiary Tuffs in Lacustrine and Alluvial Deposits in the Ray- San Manuel Area, Pinal and Gila Counties, Arizona By MEDORA H. KRIEGER Drake Peak-A Structurally Complex Rhyolite Center in Southeastern Oregon By RAY E. WELLS Palladium, Platinum, and Rhodium Concentrations in Mafic and Ultramafic Rocks from the Zhob Valley and Dargai Complexes, Pakistan By NORMAN J. PAGE, JOSEPH HAFFTY, and ZAKI AHMAD GEOLOGICAL SURVEY PROFESSIONAL PAPER 1124-A-F UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON: 1980 UNITED STATES DEPARTMENT OF THE INTERIOR CECIL D. ANDRUS, Secretary GEOLOGICAL SURVEY H. William Meiiard, Director Library of Congress catalog-card No. 79-600186 For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402 Stock Number 024-001-03247-3 CONTENTS [Letters designate the chapters] (A) The Vermilion Granitic Complex—A New Name for Old Rocks in Northern Minnesota, by D. L. Southwick and P. K. Sims (B) Potassium-Argon Ages from the Mount Taylor Volcanic Field, New Mexico, by Peter W. Lipman and Harald H. Mehnert (C) Crystals of Coexisting Alunite and Jarosite, Goldfield, Nevada, by William J. Keith, Lewis Calk, and R. -
Field Relations, Petrography and Provenance of Mafic Dikes, Western Maine David Gibson University of Maine at Farmington, [email protected]
Bates College SCARAB New England Intercollegiate Geological Conference NEIGC 2017 Day Three: October 1 2017 Oct 1st, 2017 C2: Field Relations, Petrography and Provenance of Mafic Dikes, Western Maine David Gibson University of Maine at Farmington, [email protected] Donald Osthoff University of Maine at Farmington Chase Rerrick University of Maine at Farmington Follow this and additional works at: http://scarab.bates.edu/neigc2017 Part of the Geology Commons Recommended Citation Gibson, D., Osthoff, D., and Rerrick, C., 2017, Field Relations, Petrography and Provenance of Mafic Dikes, Western Maine in Johnson, B. and Eusden, J.D., ed., Guidebook for Field Trips in Western Maine and Northern New Hampshire: New England Intercollegiate Geological Conference, Bates College, p. 273-286. https://doi.org/10.26780/2017.001.0015 This Event is brought to you for free and open access by the Conferences and Events at SCARAB. It has been accepted for inclusion in New England Intercollegiate Geological Conference 2017 by an authorized administrator of SCARAB. For more information, please contact [email protected]. C2-1 FIELD RELATIONS, PETROGRAPHY AND PROVENANCE OF MAFIC DIKES, WESTERN MAINE. David Gibson [email protected], Donald Osthoff and Chase Rerrick. Department of Geology, University of Maine at Farmington, Farmington, Maine 04938. INTRODUCTION In his 1965 report on the Geology of the Bryant Pond quadrangle, Maine, C.V. Guidotti mapped some 65 mafic dikes within this field area. However, his rather enigmatic map (see Figure 2 of his report) served only to inspire a group of undergraduates and their advisor to further investigate these intrusions. Guidotti (1965) assigned a preliminary Triassic age to these intrusions but to date no accurate age determinations have been performed on these rocks. -
Geochemical Characterisation of Anatexite Within High Grade Migmatite Complex Terrain from Ogbomoso, Southwest of the Nigerian Precambrian Basement Complex
American Scientific Research Journal for Engineering, Technology, and Sciences (ASRJETS) ISSN (Print) 2313-4410, ISSN (Online) 2313-4402 © Global Society of Scientific Research and Researchers http://asrjetsjournal.org/ Geochemical Characterisation of Anatexite within High Grade Migmatite Complex Terrain from Ogbomoso, Southwest of the Nigerian Precambrian Basement Complex Adegoke Olukayode Afolabia*, Rukayat Omobolanle Lawalb, Esther Olufunmilayo Ogunmiyidec, Kolade Adeosund a,b,c,dDepartment of Earth Sciences, Ladoke Akintola University of Technology, Ogbomoso, 210214, Nigeria aEmail: [email protected] bEmail: [email protected] cEmail: [email protected] dEmail: [email protected] Abstract Migmatite rocks are complex rocks largely due to the degree of partial melting and nature of parent rocks of this rock type. Partial melting or anatexis yield metatexite and diatexite components with variable mineralogical and chemical compositions. The nature of fractionation of elements during anatexis is not clearly understood. The migmatite quartzite gneiss complex of southwestern Nigeria exposed at Ogbomoso was studied in order to constrain the geochemical character of its metatexite and diatexite components. Field mapping revealed migmatite with stromatic, surreitic and dictyonitic structures represented the metatexite while parts of the migmatite with schollen structure and granitic component represent the diatexite. Several sections of representative samples were cut and examined for mineralogical compositions. Thin section