Precambrian cataclastic migmatites

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Journal Article
Published: 01 August 1976
Canadian Journal of Earth Sciences (1976) 13 (8): 1058–1069.
...Donald A. Cranstone; Andrew Turek Abstract The Pikwitonei province is an early Precambrian inlier of retrograded granulite and amphibolite facies gneisses that separates the Superior and Churchill provinces in Manitoba. The granulites are unconformably overlain by rocks of the Superior province...
Journal Article
Journal: AAPG Bulletin
Published: 01 March 1962
AAPG Bulletin (1962) 46 (3): 289–343.
... and three units of tillitic schists totalling about 1,350 feet. The erratic pebbles and boulders were derived from an earlier Precambrian terrane of gneisses, granitic rocks, migmatites, and schists with quartzite and minor marble. The erratics were dropped haphazardly into bedded, argillaceous-silty-sandy...
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Journal Article
Published: 01 October 1977
Journal of the Geological Society (1977) 134 (1): 41–44.
... interprets the gneisses as migmatites developed from the Ben Lui and Ben Lawers schists (e.g. Read 1955 , Harris & Pitcher 1975). Further they are considered to represent the migmatitic core of the Tay Nappe (e.g. Ashworth 1975 ). Read (1955) originally considered that the rocks of his Banff Division lay...
Journal Article
Journal: AAPG Bulletin
Published: 01 September 2018
AAPG Bulletin (2018) 102 (9): 1803–1824.
...Lirong Dou; Jingchun Wang; Renchong Wang; Xiaodong Wei; Chandramani Shrivastava ABSTRACT Bongor Basin in the south of Chad is a Cretaceous–Paleogene rift basin developed on Precambrian crystalline basement and is part of the central African rift system (CARS). High oil flows have been tested from...
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Journal Article
Published: 01 January 2014
Russ. Geol. Geophys. (2014) 55 (1): 33–45.
... by upthrust faulting and shear dislocations; (3) The metamorphogene shell (456 Ma) reflects the second stage of metamorphism. At the same time, the Shara-Nur migmatite–granite complex corresponds in composition, structures, and textures to syncollisional K-granites, whereas the differentiated Khaidai gabbro...
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Series: GSA Field Guide
Published: 01 January 2012
DOI: 10.1130/2012.0029(01)
EISBN: 9780813756295
... This field trip includes results of new geological mapping and ancillary studies of Mesoproterozoic Precambrian basement and overlying Neoproterozoic metavolcanic rocks located near Mount Rogers in southwestern Virginia and northwestern North Carolina. These studies are part of a project...
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Series: GSA Memoirs
Published: 01 January 2008
DOI: 10.1130/2008.1202(10)
... as extensional detachments superimposed on, and perhaps coeval with, the thrust geometry of the orogen. From structurally lowest to highest, the plates include amphibolite-facies Archean to Paleoproterozoic orthogneiss and lesser paragneiss that retain relics of Devonian high-pressure metamorphism, migmatitic...
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Journal Article
Published: 01 February 1980
Journal of the Geological Society (1980) 137 (1): 1–34.
... the High Range, appears at first sight to be the Precambrian crystalline basement of the Tibetan sediments. But the crystalline rocks (which in addition to gneisses and granites contain high- and low-grade metasediments) show a transitional relationship with the sediments of the Tibetan zone...
Journal Article
Journal: AAPG Bulletin
Published: 01 April 1959
AAPG Bulletin (1959) 43 (4): 790–806.
...G. D. Garland; R. A. Burwash ABSTRACT It is shown that the major part of the Bouguer gravity anomaly field over central Alberta must be attributed to lithological changes in the Precambrian basement beneath the sedimentary section. By making use of the petrology and physical properties of samples...
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Journal Article
Published: 01 March 1984
Journal of the Geological Society (1984) 141 (2): 273–278.
...Peter W. U. Appel; Karsten Secher Abstract In the Precambrian Tartoq Group, SW Greenland, gold occurs in three parageneses associated with arsenopyrite-pyrite, tennantite and chalcopyrite. The gold-bearing sulphide mineralizations appear as conformable quartz layers, lenses and veins in greenstones...
Series: Geological Society, London, Memoirs, Geological Society, London, Memoirs
Published: 01 January 2004
DOI: 10.1144/GSL.MEM.2004.030.01.12
EISBN: 9781862394056
..., and also in the central part within the Main Novozemel'sky thrust zone (Fig. 1 ). The Precambrian rocks differ in age, composition and structure in the different areas. More importantly, in relation to the younger overlying strata, the archipelago is considered to be an assemblage of three tectonic...
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Journal Article
Journal: AAPG Bulletin
Published: 01 April 1974
AAPG Bulletin (1974) 58 (4): 674–684.
...Eva B. Kisvarsanyi Abstract The buried Precambrian basement of Missouri is described on the basis of data from 550 drillholes, petrographic analyses of more than 1,000 samples, and geophysical and structural data. Prominent topographic and probable structural highs are identified as (1) the Central...
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Series: Geological Society, London, Special Publications, Geological Society, London, Special Publications
Published: 01 January 2010
DOI: 10.1144/SP335.29
EISBN: 9781862395831
.... The red planes in the strain ellipsoid insets indicate observations made parallel to either the XZ or YZ sections. ( a ) and ( b ) F 2 asymmetric folds, indicating top-to-the-SW thrusting developed in leucosomatic layers within strongly migmatitic granitic/granodioritic gneisses. ( c ) Top-to-the-SW...
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