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The Genesis of Volcanic Rocks of Ying Cheng Group in Southern Songliao Basin

Author: ChenJingSheng
Tutor: GeWenChun
School: Jilin University
Course: Mineralogy,petrology, Mineral Deposit Geology
Keywords: Songliao Basin Of Yingcheng Volcanic rocks Geochemistry Petrogenesis Tectonic setting
CLC: P588.1
Type: Master's thesis
Year: 2009
Downloads: 214
Quote: 4
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Abstract


Through the volcanic rocks in the southern Songliao Basin of Yingcheng science, geochronology , geochemistry and zircon Hf isotope studies determined volcanic rock era , discusses the types and causes of mechanism of volcanic rocks , and illustrates that the southern Songliao Basin Yingcheng formation background and kinetic mechanism and its constraints on the formation of Songliao Basin . Zircon LA - ICPMS, U - Pb dating results , Songliao Basin south of Yingcheng volcanic rocks formed in the Early Cretaceous , zircon Hf isotope volcanic rock has a higher ratio of 176Hf/177Hf positive εHf (t) values ??in this area . their magma source hyperplasia juvenile crust from the depleted mantle melting occurred in the Mesozoic rocks . Camp city in southern Songliao Basin volcanic rocks of the geochemical characteristics and spatial location of the output can be divided into three types : rhyolite belongs the A2 subtypes granite 1 - Class 2 - Class I -type granites rhyolite and adakitic dacite . Accordance with Sr and Yb classification , high Sr and low Yb dacite formation depth at least greater than 40 km ; low Sr and high- Yb 2 - Class rhyolite in normal crustal depth about 30km formation ; very low Sr and high-Yb 1 - rhyolite formation depth of less than 30km. The geochemical characteristics of the tectonic setting of the area volcanic rocks formed as extensional environment , combined with evidence that this tectonic setting of the Pacific plate oblique subduction related geochronology and geophysics .

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