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地球学报  2008 

豫西地区秦岭造山带武当群火山岩和沉积岩锆石U-Pb年龄

DOI: 10.3975/cagsb.2008.06.25

Keywords: 武当群,锆石U-Pb年龄,秦岭造山带,豫西,新元古代

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Abstract:

在南秦岭地体中广泛分布着武当群变质沉积-火山岩组合的基底岩石,是东秦岭造山带重要的岩石单元,但对其形成时代的认识存在分歧.笔者通过对豫西地区武当地体北部武当群上部杨坪组变质沉积岩和下部双台组变质中酸性火山岩锆石u-Pb年龄的测定,认为杨坪组变质沉积岩沉积物源主要由晚元古代(860~640Ma)和早元古代(2260~1800Ma)、少量晚太古代和中元古代地壳物质构成,与扬子陆块具有亲缘关系.沉积时代应晚于640Ma.变质中酸性火山岩形成时代为730~780Ma之间,峰值(755±6)Ma,与双台组新元古代变质基性火山岩为同期岩浆作用的产物,成因上推测与Rodinia超大陆裂解作用有关.

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