SHRIMP Zircon U-Pb Age of the Piqiang Layered Intrusion in the Tarim Large Igneous Province and Subducted Slab-Plume Interaction in Its Petrogenesis
SHRIMP Zircon U-Pb Age of the Piqiang Layered Intrusion in the Tarim Large Igneous Province and Subducted Slab-Plume Interaction in Its Petrogenesis
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塔里木大火成岩省皮羌层状岩体SHRIMP锆石U-Pb年龄及其岩石成因中的俯冲板-地幔柱相互作用
DOI：
10.1111/1755-6724.13652
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Cao Jun
中科院分区：
文献类型：
--
作者：
Cao Jun
目的二叠纪期间，亚洲东部至少形成了4个镁铁质陆相大型火成岩省（LIPs），即西伯利亚圈闭（~251Ma）、峨眉山大型火成岩省（~260Ma）、塔里木陆上大型火成岩省（~290~270Ma）和旁贾尔圈闭（~290Ma）（Shellnutt等，2015）。中国的峨眉山和塔里木 LIP 都因存在层状镁铁镁铁岩侵入体中的几种岩浆 Fe-Ti-V 氧化物矿床而闻名。这种岩浆铁钛钒氧化物沉积物的起源是个谜。长期争论之一是大量铁钛氧化物在层状侵入体中积累的机制。无论机制如何，关于 Fe-Ti-V 氧化物矿岩体的地幔源成分仍然存在相当大的争议。在塔里木地块北缘的皮羌层状岩体中，存在着巨大的铁钛钒氧化物矿床。该岩体主要由辉长岩和少量斜长石斜长石和斜长岩组成（图 1a）。在这项研究中，我们提供了 Piqiang 层状辉长岩侵入体的新 SHRIMP 锆石 U-Pb 年龄和全岩地球化学数据，以评估其可能的源成分的性质，这反过来又有助于了解与羽流相关的 LIP 中巨型 Fe-Ti-V 氧化物矿床的形成。
ObjectiveDuring the Permian, at least four mafic continental large igneous provinces (LIPs) were formed in eastern Asia, ie, the Siberian traps (~ 251 Ma), Emeishan LIP (~ 260 Ma), Tarim LIP (~ 290–270 Ma) and Panjal traps (~ 290 Ma)(Shellnutt et al., 2015). The Emeishan and Tarim LIPs in China are both known for the presence of several magmatic Fe-Ti-V oxide deposits hosted in layered maficultramafic intrusions. The origin of such magmatic Fe-Ti-V oxide deposits is enigmatic. One of the long-lasting debates is the mechanism by which large amounts of Fe-Ti oxides accumulated in the layered intrusions. Regardless of mechanism, there is still considerable debate regarding the mantle source compositions of the Fe-Ti-V oxide orebearing intrusions. In the Tarim LIP, a giant Fe-Ti-V oxide deposit is hosted by the Piqiang layered intrusion at the northern margin of the Tarim block. This intrusion consists mainly of gabbro and minor plagioclase-bearing clinopyroxenite and anorthosite (Fig. 1a). For this study we present new SHRIMP zircon U-Pb age and whole-rock geochemical data for the Piqiang layered gabbroic intrusion to evaluate the nature of its possible source compositions, which in turn aids in understanding the formation of the giant Fe-Ti-V oxide deposit in the plumerelated LIPs.