利用锆石形态、成分组成及年龄分析进行沉积物源区示踪的综合研究  

PROVENANCE TRACING OF SEDIMENTS BY MEANS OF SYNTHETIC STUDY OF SHAPE, COMPOSITION AND CHRONOLOGY OF ZIRCON

作　　者：闫义[1] 林舸[1] 李自安[1] 

机构地区：[1]中国科学院广州地球化学研究所,广东广州510640

出　　处：《大地构造与成矿学》2003年第2期184-190,共7页Geotectonica et Metallogenia

基　　金：国家自然科学基金项目(49972045);中科院知识创新工程重要方向项目(KZCX2-113)资助.

摘　　要：通过盆地碎屑沉积物分析示踪源区,进而探讨区域构造演化已成为当前地学研究的热点。盆地沉积物中的锆石不但分布广泛,而且稳定性极强,因而能保存大量的源区信息。随着锆石裂变径迹及U-Pb年龄谱分析等新测试技术的发展,锆石的形态、成分组成及年龄分析已成为盆地沉积物源区示踪的重要探针。本文结合实例,介绍了目前在综合利用锆石的形态、成分组成及年代学特征进行物源示踪的一些主要进展。由于物源示踪的复杂性,在利用锆石进行物源示踪时,应充分了解区域地质背景,密切结合其它物源示踪方法。Coupling between sedimentation in basin and unroofing erosion in its surrounding orogenic belts makes it is possible to understand basin mountain evolution, thermo tectonic history and surface crustal recycling process by studying the detritus composition, geochemical characteristics and isotopic geochronology of basin sediments. However, due to influence by the diversity of basin provenance and the difference between sources and the differentiation during transportation process, it is difficult to quantitatively determine the proportion of each possible source region to the basin only through sediment fragment composition, heavy mineral and geochemistry analysis. Zircon not only is distributed widely in sediments, but also is very stable, and can reserve many information of source. With new analyzing technology development, such as zircon fission track and U Pb dating technology, zircon has been widely used for tracing sediments source. In this paper, some new progress through analyzing the shape, composition and chronology of zircon to trace basin source are introduced. Because basin provenance is very complex, when using zircon to trace sediments source, the tectonic setting must be studied comprehensively.

关 键 词：盆地沉积物 锆石 区域构造演化 锆石裂变径迹 U-Pb年龄谱分析 物源示踪 矿物年代学 

分 类 号：P512.2[天文地球—地质学] P597.3