东昆仑-西秦岭造山带对接处三叠纪花岗质岩石时空演化、物源特征对比及其大地构造意义
投稿时间:2016-10-21  修订日期:2016-10-21  点此下载全文
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作者单位E-mail
任海东 青海大学 mingqiangren@163.com 
王涛 中国地质科学院地质研究所 taowang@cags.ac.cn 
基金项目:中国地质调查局项目(编号项目号:12120113094000, 1212010811033)和国家自然科学基金(项目号:41172062和41572052)
中文摘要:造山带组成与演化是大地构造研究的主要课题,造山带之间的对接关系更是造山带研究的重要节点。在两大造山带对接地带,构造-岩浆演化的对比,特别是深部物质组成结构和基底属性的对比,可为完整认识造山带的物质组成和构造演化提供重要的依据。基于花岗质岩石同位素填图(Sm-Nd、Lu-Hf)在其年代学、区域性大面积展步和易于示踪等方面的优势,区域性的同位素填图逐步成为一项重要的技术方法,应用于探讨造山带深部组成结构,对比造山带基底属性异同。
中文关键词:花岗质岩石、锆石年代学、Nd-Hf同位素填图、岩浆演化作用、东昆仑东段和西秦岭西段
 
Temporal-spatial variations, sources and tectonic significances of the Triassic granitic rocks in the junction part of the East Kunlun and West Qinling Orogen, Central China
Abstract:The coThe composition and evolution of orogen is the main subject of tectonic study, and the connection relationship between orogens is an important node in orogenic study. In the junction part of two orogenic belts, the contrast of tectonic-magmatic evolution between two orogens, especially contrast of deep crustal composition structure and basement affinity, can provide an important basis to completely understand the basement nature and tectonic affinity of the orogen. Based on its advantages in geochronology, regional widely distributed and easily tracing, Nd-Hf isotopic mapping for granitic rocks has gradually become an effective approach to delineate tectono-thermal evolution of the orogen, elucidate orogenic composition and contrast basement nature between two orogens. mposition and evolution of orogen is the main subject of tectonic study, and the connection relationship between orogens is an important node in orogenic study. In the junction part of two orogenic belts, the contrast of tectonic-magmatic evolution between two orogens, especially contrast of deep crustal composition structure and basement affinity, can provide an important basis to completely understand the basement nature and tectonic affinity of the orogen. Based on its advantages in geochronology, regional widely distributed and easily tracing, Nd-Hf isotopic mapping for granitic rocks has gradually become an effective approach to delineate tectono-thermal evolution of the orogen, elucidate orogenic composition and contrast basement nature between two orogens.
keywords:Granitic rocks, zircon geochrGranitic rocks, zircon geochronology, Nd-Hf isotopic mapping, magmatism evolution  the eastern part of East Kunlun and the western part of West Qinlingonology, Nd-Hf isotopic mapping, magmatism evolution  the eastern part of East Kunlun and the western part of West Qinling
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