Geochronology, Petrogeochemical Characteristics and Tectonic Significance of Gabbro Dike from Western Quruqtagh in Xinjiang
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摘要: 库鲁克塔格位于塔里木克拉通与南天山构造带结合部位。笔者报道了其西段辉长岩脉，岩脉主体岩性为辉长岩，使用LA-ICP-MS法测得锆石U-Pb定年龄为（411±5） Ma，为岩体的成岩年龄，属早泥盆世幔源岩浆活动产物。岩石化学特征显示，辉长岩SiO2含量为48.60%~50.61%，MgO含量为5.51%~7.96%，Mg#值为51~59，属钙碱性玄武岩系列；稀土元素特征显示，轻稀土元素相对富集，具Eu弱负异常；在微量元素原始地幔标准化蛛网图上，该辉长岩富集K、Rb等大离子亲石元素，亏损Nb、Ta、P、Ti等高场强元素。结合区域地质资料及地球化学特征，笔者认为辉长岩源自被俯冲流体改造过的亏损地幔楔的部分熔融，这为南天山南缘古生代中期主动大陆边缘性质提供了有益信息。
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关键词:
- 辉长岩 /
- LA-ICP-MS锆石U-Pb定年 /
- 库鲁克塔格 /
- 南天山
Abstract: The Quruqtagh is located at the junction part between Tarim Craton and Southern Tianshan tectonic zone. The gabbro dike has been found in the western section of Quruqtagh area, which is composed mainly of gabbro. Zircon LA-ICP-MS U-Pb dating yields an age of (411±5)Ma, implying that the magmatic crystallization epoch of the gabbro is lower Devonian. Geochemical characteristics show that SiO2 contents range from 48.60% to 50.61%, while MgO contents range from 5.51% to 7.96% with Mg# values of 51~59. This gabbro is characterized by calk-alkaline basaltic series, with relative LREE enrichment and weakly Eu anomaly in the chondrite-normalized REE patterns. In the primitive mantle-normalized trace elements patterns, this gabbro is enriched in LILEs such as K and Rb, while it's depleted in HFSEs, such as Nb, Ta, P and Ti. According to the comprehensive synthesis on regional geology and geochemical characteristics, the gabbro magma is considered to have been derived from partial melting of depleted mantle wedge that previously metasomatized by slab-derived aqueous fluids. This contribution provides helpful information for understanding the middle Paleozoic tectonic features of southern margin of south Tianshan served as an active continental margin.-
Keywords:
- gabbro dike /
- LA-ICP-MS zircons U-Pb dating /
- Quruqtagh /
- southern Tianshan
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