塔里木盆地夏河南层状玄武岩的岩石地球化学特征及地质意义

发布时间：2018-05-04 00:04

本文选题：玄武岩 + 地球化学　；参考：《岩石学报》2017年06期

【摘要】：塔里木盆地夏河南玄武岩露头以水平层状分布为最大特征,其玄武岩层和沉积夹层保持了较原始的产状,是研究塔里木盆地二叠纪多期次玄武质岩浆活动的理想场所,是对比盆地内其他玄武质岩浆活动的最佳剖面。本文通过详细的野外和遥感解译工作,报道了夏河南玄武岩的野外产状、岩相学特征和各层玄武岩的地球化学特征,探讨了夏河南玄武岩的岩浆源区和岩浆演化过程。研究认为夏河南玄武岩质岩浆来源于富集的岩石圈地幔,为尖晶石-石榴石二辉橄榄岩经历低程度部分熔融的产物,各层玄武岩的成分差异与部分熔融程度有关,单一层内玄武岩的岩浆演化以分离结晶为主,地壳混染程度较小。夏河南各层玄武岩来源于同一岩浆源区,其特征与柯坪玄武岩相似,可对应于柯坪地区开派兹雷克组的6层玄武岩。研究进一步明确了塔里木盆地早二叠世玄武岩的空间分布特征,证实塔里木早二叠世大火成岩省的玄武质岩浆作用可从柯坪地区延伸到夏河南、塔中、塔西南等地。
[Abstract]:The outcrop of Henan basalt in Tarim Basin is characterized by horizontal stratiform distribution, and its basalt layer and sedimentary intercalation maintain primitive occurrence, which is an ideal place to study Permian multi-stage Black Tortoise magmatic activity in Tarim Basin. It is the best profile of other Black Tortoise magmatic activities in the basin. Based on detailed field and remote sensing interpretation, this paper reports the field occurrence, lithofacies and geochemical characteristics of basalts in Henan Province, and discusses the magmatic source and magmatic evolution process of basalts in Henan Province. It is considered that the basaltic magma in Henan is derived from the enriched lithospheric mantle and is the product of the low degree of partial melting of spinel garnet erxenite. The composition differences of basalts in each layer are related to the degree of partial melting. The magmatic evolution of basalt in a single layer is mainly separated and crystallized, and the degree of crustal mixing is relatively small. The basalts in Henan are derived from the same magmatic source, and their characteristics are similar to those of Keping basalts, corresponding to the 6 layers of basalts in Kaipaizlek formation in Keping area. The spatial distribution characteristics of early Permian basalt in Tarim Basin are further clarified. It is confirmed that the Black Tortoise magmatism in the early Permian great igneous province of Tarim Basin can be extended from Keping area to Henan, Tazhong and southwest of Tarim Basin.
【作者单位】：国家海洋局第二海洋研究所海底科学重点实验室;浙江大学地球科学学院;中山大学地球科学与工程学院;
【基金】：浙江省自然科学基金项目(LY17D020001) 国家自然科学基金项目(41603029) 基本科研业务费专项资金(JG1518、2017QNA3015)联合资助
【分类号】：P588.145

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