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近年来,碎屑金红石的研究已成为沉积物源区分析的一个新前沿。金红石的地球化学组成,尤其是Cr,Nb,Zr等微量元素的含量,对其母岩的形成条件和所经历的地质过程都具有重要的指示意义,同时,碎屑金红石在沉积、成岩过程中表现出极高的稳定性,因而是物源分析的理想指针矿物。首先介绍金红石的矿物学和地球化学基本性质,分析不同来源的金红石典型特征,重点阐述碎屑金红石在物源分析中运用的5个方面:①金红石重矿物比值;②金红石矿物化学成分Cr-Nb判别图解;③金红石Zr含量温度计;④金红石的U-Pb和(U-Th)/He定年;⑤金红石Lu-Hf同位素。综合上述5个方面的物源分析研究,可以获取金红石的母岩类型、形成温度及后期所经历的热演化史等信息。碎屑金红石的物源研究处于起步和探索阶段,仍存在一些亟需解决的问题。
In recent years, the research of detritus rutile has become a new frontier in the analysis of sedimentary source areas. The geochemical composition of rutile, especially trace elements such as Cr, Nb and Zr, is of great significance to the formation conditions of the parent rocks and the geological processes they have undergone. At the same time, the rutile rutile deposits and diageses It shows high stability and is therefore an ideal indicator mineral for source analysis. Firstly, the basic properties of rutile mineralogy and geochemistry are introduced, and the typical characteristics of rutile from different sources are analyzed. Five aspects of the rutile rutile used in provenance analysis are described emphatically: ① ratio of rutile heavy minerals; ② rutile mineral chemical composition Cr-Nb Discrimination diagram; rutile Zr content thermometer; rutile U-Pb and (U-Th) / He dating; rutile Lu-Hf isotope. Based on the above five aspects of provenance analysis, we can get information on the type of the parent rock of rutile, the formation temperature and the thermal evolution history experienced in the later period. Research on the origin of detritus rutile is still in its infancy and exploration stage. There are still some problems to be solved urgently.