Results 131 to 140 of about 1,204 (166)
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Proterozoic Granitoids of Rajasthan
Journal of the Geological Society of India, 2005Abstract Two granitoid bodies each from Palaeo-, Meso- and Neo-proterozoic periods have been studied for their chemical, petrological and source characteristics The Proterozoic granitoids are megacrystic as well non-megacrystic with variable effect by tectonometamorphic events The Palaeo-proterozoic granitoids are peraluminous ...
S.K Bhushan, V.K. Chittora
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Ultrametamorphism and granitoid genesis
Tectonophysics, 1977Abstract A model is presented to explain the geochemical and mineralogical characteristics of granitoids and their inclusions. The product of ultrametamorphism is melt + residuum, both of which may move en masse to the site of crystallization. The nature of the source material can be deduced from studies on the granitoids and their inclusions; based
Allan J.R. White, Bruce W. Chappell
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1994
Granitoid rocks comprise granites, alkali-feldspar granites, granodiorites and tonalites, and constitute a large portion of the continental crust. Because the main constituents — alkali-feldspar, plagioclase, quartz, biotite, muscovite, hornblende — are found over a wide range of P-T conditions, this rock group is not a very useful indicator of ...
Kurt Bucher, Martin Frey
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Granitoid rocks comprise granites, alkali-feldspar granites, granodiorites and tonalites, and constitute a large portion of the continental crust. Because the main constituents — alkali-feldspar, plagioclase, quartz, biotite, muscovite, hornblende — are found over a wide range of P-T conditions, this rock group is not a very useful indicator of ...
Kurt Bucher, Martin Frey
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Tectonic discrimination of granitoids
Geological Society of America Bulletin, 1989Granitoids as categorized by tectonic environment are (1) island arc granitoids (IAG), (2) continental arc granitoids (CAG), (3) continental collision granitoids (CCG), (4) postorogenic granitoids (POG), (5) rift-related granitoids (RRG), (6) continental epeirogenic uplift granitoids (CEUG), and (7) oceanic plagiogranites (OP).
PAPU D. MANIAR, PHILIP M. PICCOLI
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Neoproterozoic granitoids on Wrangel Island
Doklady Earth Sciences, 2016Based on geochronological U–Pb studies, the age of Wrangel Island granitoids was estimated as Neoproterozoic (Cryogenian). Some granitoids contain zircons with inherited cores with an estimated age of 1010, 1170, 1200, and >2600 Ma, assuming the presence of ancient (Neoarchean–Mesoproterozoic) rocks in the Wrangel Island foundation and their ...
M. V. Luchitskaya +3 more
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Chlorites from Italian granitoid rocks
TMPM Tschermaks Mineralogische und Petrographische Mitteilungen, 1976Chemical, X-ray, optical, thermal and microprobe analyses have been carried out on six chlorites from Italian granitoid rocks formed as a result of deuteric action on biotites.
Mirella Bondi, L. Morten, P. L. Rossi
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Metamorphism of Granitoid Rocks
2002Granitoid rocks comprise granite, alkali-feldspar granite, granodiorite and tonalite. They constitute the largest portion of the continental crust. Granitoid gneisses, commonly migmatites, are in fact the dominant rock type of the continents. Because the main constituents — alkali-feldspar, plagioclase, quartz, biotite, muscovite, hornblende — are ...
Kurt Bucher, Martin Frey
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Chinese Journal of Geochemistry, 1998
Proterozoic granitoid rocks in Zhejiang Province were formed in the Shengongian period (1.8–1.9 Ga) and the Late Jinningian period (0.6–0.9 Ga), respectively. Petrogenetic problems are discussed based on chemical (major, trace elements and REEs) and Nd-Sr isotopic compositions.
Wang Yixian +3 more
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Proterozoic granitoid rocks in Zhejiang Province were formed in the Shengongian period (1.8–1.9 Ga) and the Late Jinningian period (0.6–0.9 Ga), respectively. Petrogenetic problems are discussed based on chemical (major, trace elements and REEs) and Nd-Sr isotopic compositions.
Wang Yixian +3 more
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Chinese Journal of Geochemistry, 1998
The Phanerozoic granitoid rocks include the Caledonian, Indosinian and Yenshanian granitoid rocks. The existence of Caledonian and Indosinian granites was evidenced by zircon U-Pb ages. The study of the characteristics of major, trace and rare-earth elements, isotopic composition and petrogenesis for the granitoid rocks has been made.
Wang Yixian +3 more
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The Phanerozoic granitoid rocks include the Caledonian, Indosinian and Yenshanian granitoid rocks. The existence of Caledonian and Indosinian granites was evidenced by zircon U-Pb ages. The study of the characteristics of major, trace and rare-earth elements, isotopic composition and petrogenesis for the granitoid rocks has been made.
Wang Yixian +3 more
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Granitoidal Oil-Bearing Formation
SPE Asia Pacific Conference on Integrated Modelling for Asset Management, 1998Abstract At the time being there are known some tens oil and gas fields in magmatic (Libya, United States, Venezuela, Russia, China, Egypt, India, etc.). The oil field Bachho (White Tiger) is confined to a horst-shaped granitoid massif - the basement - with a complex inner structure.
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