秦岭杂岩中变质侵入体特征
Characteristics of metamorphic intrusion in Qinling complex
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摘要: 通过凤(县)—太(白)地区1:250000地质填图,从秦岭杂岩中解体划分出变质侵入体,命名为两河口岩体。锆石同位素年龄为851.8±1.9Ma。据岩体岩石学、岩石化学、地球化学特征,北秦岭造山带沿商丹一线(西部)存在晋宁期大陆弧型花岗岩。并可与东秦岭地区蔡凹岩体、德河岩体等对比。两河口岩体的确立,对晋宁运动的存在、运动性质及Rodinia超大陆的拼接形成提供了新的证据。Abstract: Lianghekou lithosome is a metamorphic intrusion and extracted from Qinling complex based on the Fengxian Taibai 1:250 000 geological mapping. The zircon isotope age is 851.8±1.9Ma. According to the petrologic and lithochemical character, there is Jinning continental arc granite along the Shangluo-Danfeng of North Qinling orogenic belt. And it can compare with the lithosome of Caiao and Dehe in East Qinling area. The confirmation of the Lianghekou lithosome provides a new evidence to the existing of Jinning movement,its moving characteristics and the form of Rodinia supercontinent.
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Key words:
- Qinling complex /
- Jinning period /
- metamorphic intrusion
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