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题名: Effects of high pressure and temperature on carbon isotope compositions of some acyclic alkanes and preservation of organic matter
作者: Du, Jianguo ; Wang, Chuanyuan ; Wang, Wanchun ; Cui, Yueju ; Zhang, Weibin
刊名: HIGH PRESSURE RESEARCH
出版日期: 2012
卷号: 32, 期号:2, 页码:220-232
关键词: evolution of organic matter ; pyrolysis of lignite ; mantle hydrocarbons ; biomarker compounds
学科分类: Physics, Multidisciplinary
英文摘要: Late Paleozoic magmatic rocks (including basic dykes, basaltic andesite, rhyolite, keratophyre and syeniteporphyry with minor tuff) are widespread in the western margin of the East Junggar terrane. In-situ zircon U-Pb dating and Hf isotope analyses were carried out for these magmatic rocks from the Baijiangou and Zhangpenggou localities of East Junggar, integrating with geochemical data, to investigate their tectonic evolution as well as crustal accretionary process of this region in the Late Paleozoic. Inherited zircons from basic dykes range in age from 435 Ma to 300 Ma. The Zhangpenggou rhyolite and keratophyre have typical arc-like geochemical signatures and were formed in the Early Carboniferous (332 Ma and 336 Ma, respectively), suggesting they are products of subduction-related magmatism. The Baijiangou rhyolites were formed in the Late Carboniferous (315 Ma and 323 Ma) and their formation ages are similar to those of the syenite-porphyries (307 Ma and 312 Ma). The Hf model ages and the formation ages of zircons from these magmatic rocks are alike, with positive epsilon(Hf)(t) values vary from +0.7 to +16.6, implying that voluminous growth of juvenile crust happened in the East Junggar terrane during the Late Paleozoic. The absence of Precambrian inherited zircons in basic dykes indicates the lack of Precambrian basement beneath the East Junggar terrane. Taking geochronological studies on regional ophiolites into account, the East Junggar terrane is considered as a Devonian-Carboniferous oceanic island arc which has been continuously accreted to the southern active margin of the Siberian Craton since the Early Carboniferous. (C) 2011 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
收录类别: SCI
所属项目名称: Natural Science Foundation of China [40873049, 40806048]
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.lig.ac.cn/handle/132962/2144
Appears in Collections:油气地球化学研究室_期刊论文

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Du, Jianguo; Wang, Chuanyuan; Wang, Wanchun; Cui, Yueju; Zhang, Weibin.Effects of high pressure and temperature on carbon isotope compositions of some acyclic alkanes and preservation of organic matter,HIGH PRESSURE RESEARCH,2012,32(2):220-232
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