东喜马拉雅构造结多雄拉混合岩和花岗片麻岩锆石U-Pb年龄及其地质意义

郭亮,张宏飞,徐旺春. 东喜马拉雅构造结多雄拉混合岩和花岗片麻岩锆石U-Pb年龄及其地质意义[J]. 岩石学报, 2008, 24(3).
引用本文: 郭亮,张宏飞,徐旺春. 东喜马拉雅构造结多雄拉混合岩和花岗片麻岩锆石U-Pb年龄及其地质意义[J]. 岩石学报, 2008, 24(3).
U-Pb zircon ages of migmatite and granitic gneiss from Duoxiongla in eastern Himalayan syntaxis and their geological implications[J]. Acta Petrologica Sinica, 2008, 24(3).
Citation: U-Pb zircon ages of migmatite and granitic gneiss from Duoxiongla in eastern Himalayan syntaxis and their geological implications[J]. Acta Petrologica Sinica, 2008, 24(3).

东喜马拉雅构造结多雄拉混合岩和花岗片麻岩锆石U-Pb年龄及其地质意义

  • 基金项目:

    国家自然科学基金 , 教育部长江学者和创新团队发展计划

U-Pb zircon ages of migmatite and granitic gneiss from Duoxiongla in eastern Himalayan syntaxis and their geological implications

  • 位于东喜马拉雅构造结的南迦巴瓦岩群是研究喜马拉雅构造带基底演化的重要对象之一.在构造样式上,南迦巴瓦岩群为一个背形构造,该背形构造的核部由多雄拉混合岩和花岗片麻岩组成.本文开展了南迦巴瓦岩群多雄拉混合岩的锆石LA-ICP-MS U-Pb定年研究.结果表明.多雄拉混合岩深色体的原岩形成年龄为1759±10Ma,浅色体的形成年龄为1594±13Ma,代表发生混合岩化的年龄.另外,一个多雄拉花岗片麻岩的原岩形成年龄为1583±6Ma,该年龄在误差范围内与区域发生混合岩化作用的时代相近,表明在混合岩化过程中存在着一定程度的地壳深熔作用.区域对比表明,低喜马拉雅和高喜马拉雅构造单元内存在着明显不同的构造一岩浆事件,其中低喜马拉雅构造单元广泛存在1.6~1.8Ga的构造-岩浆事件.与之相对比,多雄拉混合岩和花岗片麻岩的锆石U-Pb年代学说明南迦巴瓦岩群核部应属于低喜马拉雅结晶岩系,而明显不同于高喜马拉雅结晶岩系,这与西喜马拉雅构造结相似,表明东喜马拉雅构造结与西喜马拉雅构造结有着相似的地质演化.
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刊出日期:  2008-03-31

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