干旱区生态环境知识资源中心(Arid): 塔里木北缘新元古代早期构造演化的锆石U-Pb年代学和地球化学约束

Arid

	塔里木北缘新元古代早期构造演化的锆石U-Pb年代学和地球化学约束
其他题名	Early Neoproterozoic Tectonic Framework of North Margin of Tarim Basin, Constraints from Zircon U-Pb Geochronology and Geochemistry
	杨鑫 1; 徐旭辉 2; 李慧莉 2; 蒋华山 3; 张继标 2; 钱一雄 2
来源期刊	大地构造与成矿学
ISSN	1001-1552
出版年	2017
卷号	41 期号:2 页码:381-395
中文摘要	塔里木盆地被沙漠区覆盖, 基底岩心样品对前寒武纪构造演化的研究具有重要意义。在前人研究基础上, 结合盆地内钻井、地震资料, 通过基底岩心样品的锆石U-Pb年代学和地球化学分析, 为塔里木盆地北缘新元古代构造演化格架提供约束。LA-ICP-MS法给出片麻岩基底样品的加权平均年龄为8227 Ma(置信度95%, MSWD=2.4), SHRIMP法在上覆震旦系砂岩中获得~2.5 Ga和2.1~1.8 Ga的两组锆石年龄。岩相学和元素地球化学特征显示二云斜长片麻岩样品的原岩为花岗闪长岩类, 与相邻钻井揭示的青白口系基性岩墙都属于钙碱性-高钾钙碱性岩浆系列, 具有相似的REE配分型式, 以强烈亏损Nb、Ta、P等HFSE为特征。构造环境判别图解和Sr-Nd同位素比值显示塔里木盆地北缘新元古代早期的岩浆活动可能形成于陆缘弧的构造环境。
英文摘要	Being covered by vast desert, the Neoproterozoic tectonic evolution of the Tarim Basin is not well-documented. In this study, zircon U-Pb geochronological and geochemical analyses were carried out on samples from the drilling cores, and the Early Neoproterozoic tectonic evolution of the north margin of the Tarim Basin is discussed on the basis of the results and previous works on the outcrops around the desert. LA-ICP-MS U-Pb dating of zircon grains from the gneiss in the metamorphic basement of the Tarim Basin yields a weighted average age of 8227 Ma (MSWD=2.4). In addition, two distinctive groups of zircon ages of ca. 2.5 Ga and 2.1-1.8 Ga were obtained from the Sinian sandstones using SHRIMP zircon U-Pb method. The petrographic and geochemical characteristics of the two-mica plagioclase gneiss demonstrated that it is metamorphosed granodiorite. Both the granodiorites and the mafic dyke collected from the adjacent drilling cores are of calc-alkaline and high-K calc-alkaline series. The rocks are characterized by right-dipping REE patterns and strong depletion of Nb, Ta, P and other HFSEs. The trace element and Sr-Nd isotope compositions of the igneous rocks suggest that the north margin of the Tarim Basin was under a tectonic setting of continental margin arc in the Neoproterozoic.
中文关键词	塔里木盆地 ; 天山南 ; 新元古代 ; 变质基底
英文关键词	Tarim Basin South Tianshan Neoproterozoic metamorphic basement
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOLOGY
WOS研究方向	Geology
CSCD记录号	CSCD:5992388
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/235728
作者单位	1.中国石化石油勘探开发研究院, 中国科学院油气资源研究重点实验室, 北京 100083, 中国; 2.中国石化石油勘探开发研究院, 北京 100083, 中国; 3.中国石化西北油田分公司勘探开发研究院, 乌鲁木齐, 新疆 830011, 中国
推荐引用方式 GB/T 7714	杨鑫,徐旭辉,李慧莉,等. 塔里木北缘新元古代早期构造演化的锆石U-Pb年代学和地球化学约束[J],2017,41(2):381-395.
APA	杨鑫,徐旭辉,李慧莉,蒋华山,张继标,&钱一雄.(2017).塔里木北缘新元古代早期构造演化的锆石U-Pb年代学和地球化学约束.大地构造与成矿学,41(2),381-395.
MLA	杨鑫,et al."塔里木北缘新元古代早期构造演化的锆石U-Pb年代学和地球化学约束".大地构造与成矿学 41.2(2017):381-395.