太古宙TTG岩石是什么含义?

【#文档大全网# 导语】以下是®文档大全网的小编为您整理的《太古宙TTG岩石是什么含义?》，欢迎阅读！

太古宙TTG岩石是什么含义？

张旗;翟明国

【期刊名称】《岩石学报》 【年(卷),期】2012(028)011

【摘 要】太古宙TTG岩石的成因是一个热门话题,它与太古宙麻粒岩地体并称为太古宙两大疑案.TTG岩石关系到地球早期陆壳是如何形成、生长和演化的.现在流行的观点是,太古宙TTG要么产于板块消减带,要么来自加厚的下地壳,这两种说法孰对孰错?笔者认为二者证据都不充分.上述认识是将太古宙TTG与现代埃达克岩简单对比得出来的,而这种对比忽略了地质时代和构造背景的差异,正确的对比应当是在太古宙不同类型花岗质岩石之间进行.太古宙地壳异常的热,什么时候开始出现板块构造至今没有得到明确的结论.太古宙TTG是太古宙地壳的主要成分,太古宙TTG地体反映的是太古宙地壳的平均厚度,加厚是相对于正常地壳厚度而言的.太古宙地质研究存在一个明显的误区,即不恰当地运用“将今论古”的原则,“将今论古”只适合显生宙或中-新元古代.研究TTG岩石意义十分重大,对我们理解前板块构造以及板块构造何时开始的是很关键的.%The Archean granulite massif and Archean TTG are two big mystery in Archean. Archean TTG has long been a hot topic. It is related to how the early continental crust formed grew and evolved. It has been widely acknowledged that Archean TTG formed either in a subduction zone or a product of melting thickened lower continental crust. However, these understandings were based on a simple comparison between Archean TTG and modern adakite. Instead, the correct comparison should be made between various types of Archean


granites. And the Archean crust was abnormally hot and the presence of plate tectonics in Archean is still questioned. As the major component of the Archean crust, Archean TTG reflects the average thickness of the Archean crust. But, thickened crust is a concept compared to normal crust thickness. Consequently, there is a significant misunderstanding in the studies on Archean geology and improper usage of the principle of uniformitarianism. Such principle is only applicable in Phanerozoic and Proterozoic other than Archean. TTG research is a key for us to understand the former plate tectonics and when the plate tectonics started. 【总页数】11页(P3446-3456) 【作 者】张旗;翟明国

【作者单位】中国科学院地质与地球物理研究所,北京100029;中国科学院地质与地球物理研究所,北京100029 【正文语种】中 文 【中图分类】P588.121 【相关文献】

1.TTG岩系Nb-Ta-La分馏特征的地球化学模拟:对太古宙板块俯冲与大陆地壳生长机制的约束 [J], 程素华;汪洋

2.华北克拉通太古宙TTG岩石的时空分布、组成特征及形成演化:综述 [J], 万渝生;董春艳;任鹏;白文倩;颉颃强;刘守偈;谢士稳;刘敦一

3.吉林省太古宙TTG岩石的两种演化趋势 [J], 孙德有;林强

4.太古宙TTG的Nb/Ta变化特征:对“Nb-Ta悖论”的启示 [J], 王丹;郭敬辉;马旭东


5.华北克拉通太古宙TTG岩石的形成和演化 [J], 万渝生;董春艳;任鹏;白文倩;颉颃强;谢世稳;刘守偈;马铭株;刘敦一

因版权原因，仅展示原文概要，查看原文内容请购买

本文来源：https://www.wddqxz.cn/e93fd127aa8271fe910ef12d2af90242a895abd4.html