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根据新疆西部早白垩世玄武岩中橄榄岩捕虏体单斜辉石的激光探针(LAM-ICPMS)微量元素分析结果, 分析了托云盆地陆下岩石圈地幔的性质及其所经受的部分熔融作用和地幔交代作用等深部过程. 塔里木盆地北缘(西南天山)中生代时的陆下岩石圈具显生宙的 “大洋型” 地幔特征, 经历了低于10%的部分熔融作用和复杂的地幔交代作用影响. 交代介质类似于含水的硅酸盐质碳酸岩熔体, 可能是SiO2不饱和的硅酸盐熔体与碳酸岩熔体叠加结果. 该地幔与中国东部新生代时的主体地幔性质相似, 但岩石的矿物颗粒总体较细、岩石中透辉石的总体含量较高、地幔显交代作用较明显.
Based on the results of trace element analysis by laser scanning probe (LAM-ICPMS) of peridotite xenolith xenoliths from the Early Cretaceous basalts in western Xinjiang, the characteristics of the lithospheric mantle beneath the Tuoyun Basin and its partial melting Function and mantle metasomatism, etc. The Mesozoic submarine lithosphere at the northern margin of the Tarim Basin (Tianshan Mountains, Southwest China) is characterized by the “oceanic” mantle characteristics of the Phanerozoic and has undergone partial melting of less than 10% Of the mantle metasomatism.The metasomatism is similar to that of the silicified carbonate carbonate melt and may be the result of the superimposition of SiO2 unsaturated silicate melt and carbonate melt.The mantle is similar to that of the host in the Cenozoic Era The mantle is similar in nature, but the mineral grains of the rock are generally thin, the overall content of diopside in the rock is high, and the mantle is the obvious metasomatism.