刘浩,徐大良,魏运许,彭练红,邓新,赵小明,陈铁龙,柯贤忠

• 1:中国地质调查局武汉地质矿产研究所
• 2:中国地质调查局古生物与生命-环境协同演化重点实验室
• 3:湖北地质调查院

摘要(Abstract)：

分布于扬子陆核区北缘的白竹坪火山岩—次火山岩建造为一套变酸性凝灰岩、酸性晶屑岩屑凝灰岩、流纹岩(或安山流纹岩)、次流纹斑岩的岩石组合,部分层位变质为含黄铁矿绢云板岩、含黄铁矿纳长浅粒岩。前人依据地层接触关系,将其归于青白口系,作为扬子陆核区新元古代早期的沉积建造。于北崆岭大树垭地区该火山岩建造层型剖面上分别采集了含石榴变质流纹斑岩(次流纹斑岩)和黑云二长变粒岩(变酸性晶屑凝灰岩)两个样品,并进行了LA-ICP-MS锆石U-Pb同位素年代学测定。结果表明,次流纹斑岩加权平均年龄为1852±16 Ma,而黑云二长变粒岩的年龄一组为代表其成岩年龄的1856±24 Ma,另一组为加权平均年龄为1959±11Ma,属带入的围岩锆石年龄。因此,白竹坪火山岩建造的形成时代应归为古元古代,与华山观岩体、圈椅埫岩体、殷家坪基性岩脉等Columbia超大陆裂解事件记录基本同期。黑云二长变粒岩中带入围岩的锆石可能与黄陵地区巴山寺片麻岩为同一期次岩浆活动的产物。

关键词(KeyWords)： 次流纹斑岩;流纹岩;锆石;古元古代;白竹坪;扬子陆核区

Abstract:

Keywords:

基金项目(Foundation): 中国地质调查局基础地质调查项目(No.12120113061700,No.DD20160029)资助

作者(Author): 刘浩,徐大良,魏运许,彭练红,邓新,赵小明,陈铁龙,柯贤忠

DOI: 10.19839/j.cnki.dcxzz.2017.03.010

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