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The Geochronology and Petrogenesis of Volcanic Rocks in Baiyingaolao Formation from the Southern Manzhouli, Inner-Mongolia

Author: GouJun
Tutor: SunDeYou
School: Jilin University
Course: Mineralogy,petrology, Mineral Deposit Geology
Keywords: White pitch the old group Volcanic Formation time Petrogenesis Manzhouli
CLC: P588.14
Type: Master's thesis
Year: 2010
Downloads: 204
Quote: 1
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Abstract


In this paper, the pitch of the old white southern Manchuria volcanic carried out a detailed petrology, geochronology , geochemistry and zircon Lu-Hf isotope studies to determine the age of volcanic rocks , volcanic rocks elaborated , discussed the formation tectonic setting . The pitch of the old southern Manchuria white volcanic rock types are mainly rhyolite, biotite rhyolite, pellets rhyolite, alkali feldspar rhyolite, perlite and crystal lithic rhyolitic ignimbrite crumbs , zirconium Zircon U-Pb dating results show its body formed at 139 ~ 141Ma the early Cretaceous , not the past that the late Jurassic or formed mainly between 120-130Ma . White pitch is alkaline volcanic rocks of the old rock, geochemistry and continental rift alkaline rhyolite and A-type granites and represents Zhangji Heng ( 2008 ) defined Daxinanling low Ba-Sr rhyolite . Learn granites classification , in Whalen et al. (1987) and Eby (1992) proposed genetic type granites related discrimination diagrams , white pitch rhyolite old group are located in A-type granite area, and are type A1 . Zircon Lu-Hf isotopes show that the pitch of the old white southern Manchuria volcanic rocks εHf (t) value gt; 0, varying from between 3.49 ~ 9.98 , two -stage Hf model ages (TDM2) of between 556 ~ 951Ma , the genus Neoproterozoic . Xingmeng shows and Phanerozoic orogenic granites Nd and Hf model ages the same characteristics , suggesting that the Phanerozoic granites may have the same magma source . Comprehensive studies suggest that white pitch old group magma source region is formed during the Neoproterozoic mafic lower crust. Zircon saturation temperature display The volcano magma temperature is about 768 ℃ ~ 874 ℃ between low- Sr and high-Yb volcanic features indicate that the formation of low pressure source region plagioclase and amphibole mineral phase residues . According to this dialogue pitch rhyolite old group 's findings , combined with regional relevant research data , that the pitch of the old white southern Manchuria formed in the non- volcanic intraplate orogenic extensional tectonic setting , and Mongolia - Okhotsk ocean after closure stretch effects.

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CLC: > Astronomy,Earth Sciences > Geology > Petrology > Classification of rocks > Magmatic rocks ( igneous ) > Extrusive (volcanic )
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