地球化学在物源及沉积背景分析中的应用

物源分析是盆地分析和古地理分析不可或缺的内容和方法，地球化学在物源及沉积背景分析中起着非常重要的作用。运用文献研究法对“地球化学在物源及沉积背景分析中的应用”有关文献进行了研究，分析阐述了常量元素分析、稀土一微量元素分析以及裂变径迹、K—Ar、Ar-Ar、Rb—Sr、Sm—Nd、UPb、Re-Os、S、0、Si同位素分析等方法及其优势与不足。结果表明：常量元素、稀土一微量元素分析在源区物质组成、构造背景、源区风化强度、成分成熟度及氧化一还原条件判别方面有很好的应用效果；各种同位素分析体系在不同目的的研究中具有自身优势，均得到了很好的应用。但影响岩石化学成分的因素较多，特别是对于沉积岩，很容易受外生营力的影响；物源及沉积背景分析中的地球化学方法运用单一；对研究区区域地质情况的研究不足。为此，建议在利用地球化学方法进行物源及沉积背景分析时，需要充分认识影响碎屑沉积物化学组成的因素，综合运用多种方法进行物源区分析，扬长补短，同时要特别注意对区域地质情况的研究。

Application of Geochemistry in Provenance and Depositional Setting Analysis

Provenance analysis is indispensable to basin and palaeogeography analysis, and geochemistry plays an important role in provenance and depositional setting analysis. The related literatures about the application of geochemistry in provenance and depositional setting analysis were studied; major element analysis, rare earth element-trace element analysis and isotope analyses such as fission track, K-Ar, Ar-Ar, Rb-Sr, Sm-Nd, U-Pb, Re- Os, S, O, Si, etc. were discussed, and the advantage and disadvantage of the above methods were analyzed. The results showed that maior element analysis and rare earth element-trace element analysis had good application effect on material composition, tectonic setting, weathering intensity, compositional maturity and oxidation-reduction condition of provenance; the isotope analyses had their own advantages in different studies, and all had good application effect. There were many factors on chemical composition of rocks, especially for sedimentary rock, it was easily affected by exogenous effect; geochemistry methods in provenance and depositionai setting analysis were few; the research on regional geology was inadequate. Therefore, it is suggested that the factors on chemical composition of clastic sediment should be fully studied when geochemistry methods are used to analyze the provenance and depositional setting, and multiple methods can be synthetically used and the study on regional geology should be paid more attention to.