REE示踪沉积物物源研究进展

doi:10.11867/j.issn.1001-8166.1999.02.0164

REE作为一种重要的沉积物物源示踪剂运用很广。在介绍了REE性质的基础上,对海水、河水、沉积岩、河流及边缘海沉积物中的REE元素丰度与配分模式特征进行了深入综述,概述了影响和控制REE丰度、模式及分馏特征的主要因素;论述了REE的物源示踪意义以及在国内外应用情况与存在问题:源岩风化对REE分馏的影响;颗粒搬运及沉积时水动力分选对REE分馏可能造成的影响,即不同粒级中REE不同的丰度与配分模式和碎屑矿物对沉积物中REE含量与模式影响,以及REE标准化与REE测试时可能存在的问题等。

关键词: REE, 物源, 示踪, 沉积物

As an important tracer, REE is widely used to trace provenance of various sediments and sedimentary rocks. This paper firstly describes the characteristics of REE, then summarizes REE abundance and distribution patterns in seawater, freshwater , sedimentary rocks and sediments, and theirmain controlling factors. At lastthe application and problems of REE as a source rock tracer are also described in detail. Weathering of source rock can produce REE fractionation, especially during strong chemical weathering; Transport of particles and hydrodynamic sorting during formation of sediment also have potential influences on REE characters in sediment. REE abundance and patterns are different in different grain-sized sediments. It is generally regarded that clay has REE compositionmost close to source rock, whereas sandy sediment differentiates fromsource rock inREE composition, because detritusminerals can alsoobviously influence REE content and distribution patterns in sediment. REE normalizing and determining problems are discussed in the end of the paper.

Key words: REE, Provenance, Tracer, Sediment·

中图分类号:

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摘要

RESEARCH PROGRESS IN REE TRACER FOR SEDIMENT SOURCE