Geochronology and geochemistry of the Huilvshan gabbro in west Junggar (NW China): Implications for magma process and tectonic regime

Huichao Zhang; Yongfeng Zhu

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Geochronology and geochemistry of the Huilvshan gabbro in west Junggar (NW China): Implications for magma process and tectonic regime

机译：West Junggar（NW China）Huilvshan Gabbro的地理学和地球化学研究：对岩浆过程和构造制度的影响

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摘要

Gabbro plutons, consisting of clinopyroxene and plagioclase with trace amounts of magnetite, titanite, and apatite, intruded into Early Carboniferous volcanic-sedimentary strata in the Huilvshan gold mining region (west Junggar, China). Samples collected from two gabbro bodies are tholeiitic in composition with low concentrations of Na~(2)O?+?K~(2)O, showing weak depletions of light rare earth elements with insignificant Eu, Nb, and Ti anomalies. Zircon U-Pb analyses yield a weighted average U-Pb age of 296.1?±?2.7?Ma (MSWD?=?0.98), which could represent the time corresponding to mafic magma emplacement in the Huilvshan region. Geochemical calculations suggest that this mafic magma was derived from a depleted mantle source in a post-collisional tectonic setting corresponding to ~?4% partial melting of spinel lherzolite.

机译：Gabbro钚，由肺褥油和Plagioclase组成，具有痕量的磁铁矿，钛酸盐和磷灰石，侵入了Huilvshan Gold Mining Region（中国西准锦矿区）的早期石炭系火山沉积地层。从两种加布体收集的样品在组合物中是烟草中的，具有低浓度的Na〜（2）O？+〜（2）o，显示出具有微不足道的Eu，Nb和Ti异常的轻质稀土元素的弱枯竭。锆石U-PB分析产生加权平均U-PB年龄为296.1°（mswd？= 0.98），这可以代表与Huilvshan地区的MAFIC岩浆驻留相对应的时间。地球化学计算表明，这种迈克斯·岩浆源自在碰撞的构造环境中的耗尽的地幔源，对应于尖晶石纯隆岩的〜4％的偏熔化。

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来源
《Indian medical journal》 |2018年第3期|共19页
作者
Huichao Zhang; Yongfeng Zhu;
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作者单位

Key Laboratory of Orogenic Belts and Crustal Evolution Ministry of Education China;

Key Laboratory of Orogenic Belts and Crustal Evolution Ministry of Education China;

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原文格式 PDF
正文语种 eng
中图分类医药、卫生;
关键词
Gabbro; Zircon U-Pb age; Geochemical calculation; Post-collisional tectonic setting; West Junggar China;

机译：Gabbro;锆石U-PB年龄;地球化学计算;后碰撞构造环境;西准噶尔中国;

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Geochronology and geochemistry of the Huilvshan gabbro in west Junggar (NW China): Implications for magma process and tectonic regime

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