新疆哈拉奇辉绿岩岩脉地球化学特征及构造意义
Geochemistry Characteristics and Tectonic Significance of Diabase Dikes in Halaqi Region, Xinjiang
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摘要: 新疆哈拉奇地区出露的辉绿岩岩脉为研究西南天山地区的区域大地构造演化提供了重要信息。哈拉奇地区辉绿岩岩脉亏损高场强元素Nb、Ta和重稀土元素Yb、Y，富集大离子亲石元素Ba、Sr、K和轻稀土元素La、Ce，具亏损地幔的元素地球化学特征。可以理解为亏损的地幔在板块俯冲时受到板块俯冲改造，表明在晚石炭—早二叠纪时工作区应处于岛弧环境。Abstract: The outcrop of diabase dikes in Halaqi of Xinjiang has provided important information for tectonic evolution of southwest Tianshan area. The diabase dikes in Halaqi area lack HFSE(Nb, Ta)and HREE(Yb, Y), and exhibit enrichment in LILE(Ba, Sr, K) and LREE(La, Ce). With the geochemical characteristics of depleted mantle, it can be understood as the mantle was transformed by subduction in plate subduction, indicating that during the Late Carboniferous-Early Permian, the region should have been in the island arc environment.
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Keywords:
- Diabase dike /
- Late Carboniferous-Early Permian /
- Halaqi
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