豫西毛堂群SHRIMP定年、大地构造属性及其对扬子地块裂解的约束

论文摘要

扬子陆块北缘毛堂群记录了Rodinia裂解事件的重要地质信息,对约束扬子陆块裂解过程,研究扬子古陆的演化具有重要意义。经过野外地质调查,结合SHRIMP法和LA-ICP-MS法锆石U-Pb同位素测年,及岩石化学数据综合分析,获得如下主要认识:（1）毛堂群形成于760±10Ma,即新元古代中晚期,且其岩浆活动持续时间较长,上限可能在600Ma左右。（2）毛堂群形成于大陆板内裂谷环境。（3）毛堂群酸性火山岩系显示出壳源特点,原岩可能是上部陆壳岩石的重熔产物;其基性火山岩系显示出幔源特点,是源自大陆岩石圈之下的地幔柱,并在上升过程中与大陆岩石圈相互作用,受到了不同程度的地壳混染,可能产生于60-80km深的尖晶石-石榴子石过渡带,源区的部分熔融程度可能较高。（4）毛堂群火山岩锆石测年结果显示,该区域存在与扬子克拉通内部和陆缘区时代相同的830～780Ma岩浆事件记录,指示了区域内存在晋宁期基底岩系,表明毛堂群所属的南秦岭武当地区是扬子克拉通北缘的组成部分。（5）区域地层对比表明毛堂群与武当山群和耀岭河群不具有简单的相似可比性。毛堂群姚营寨组形成时代与峡东莲沱组底部相当,更完整地记录了扬子克拉通南华纪初期的区域拉张-沉积事件;马头山组与峡东南沱组不能直接对比,可能代表发生于扬子克拉通北缘的另一次重要的构造-岩浆事件。（6）毛堂群裂谷火山活动是波及中亚-东亚（包括中国中-西部和华南）、澳大利亚、北美、非洲南部和南极的一次全球性的由地幔柱活动引发的裂谷火山事件群的组成部分。这次具有全球规模的裂谷火山事件群应当就是Rodinia超大陆裂解过程的响应。（7）扬子陆块北缘在760±10Ma时,被动裂谷开始启动,于600Ma左右,裂谷活动趋于结束,出现稳定的陆源碎屑沉积和大量的浅水碳酸岩沉积,被动大陆边缘形成,扬子克拉通新元古代陆内裂解结束。

论文目录

摘要

Abstract

1 绪论

1.1 选题依据

1.2 研究现状及存在的主要问题

1.3 主要研究内容和研究方法

1.4 完成的主要工作量

1.5 取得的新认识

2 区域地质特征

2.1 区域地层和岩石组合

2.2 变形构造和主构造事件

3 关键层位定年与毛堂群时代归属

3.1 毛堂群年代归属的争议

3.2 样品和分析方法

3.3 关键层位的SHRIMP 年龄

3.4 陡山沱组底界碎屑锆石LA-ICP-MS 测年结果对毛堂群时代的约束

4 毛堂群岩石组合、地球化学特征及其对扬子北缘裂解过程的约束

4.1 毛堂群岩石组合

4.2 典型火山岩序列的地球化学特征与构造环境分析

4.2.1 典型火山岩序列的地球化学特征

4.2.2 构造环境分析

4.3 大地构造环境特征及其火山岩系的源区特点

4.3.1 毛堂群大地构造环境特征

4.3.2 毛堂群火山岩系的源区特点

4.4 毛堂群构造岩浆活动对扬子北缘裂解过程的约束

5 结论与讨论

5.1 结论

5.2 讨论

致谢

参考文献

附录

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标签：扬子陆块北缘论文; 毛堂群论文; 超大陆论文; 裂谷论文; 构造岩浆活动论文;

豫西毛堂群SHRIMP定年、大地构造属性及其对扬子地块裂解的约束

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