石榴石电子探针分析在物源研究中的应用

Application of Electron Microprobe Analysis of Detrital Garnet to Provenance Studies

利用重矿物组合恢复母岩是一种常用的方法，但由于层内溶解作用的存在和其它因素，使这种方法存在很大的局限性。而利用石榴石电于探针分析结果来研究物源有其独到的优越性，可使水动力或成岩作用的影响降低到最小。本文以渤海海域为例，利用电子探针分析石榴石的组分，分析结果表明渤海海域的石榴石以低钙石榴石组合为主，而且不同物源区石榴石组合各具特色，同时也证明前人所作的物源研究结果是正确的。

Heavy-mineral suites have frequently been used in studies of parent rocks, but it is usually hampered by the depletion of intrastratal solution and other factors. While in the provenance analysis, the study of garnet compositions by microprobe analysis is superior and has its own originality, which reduces the effects of hydroynamism and diagenesis to a minimum. In this paper, We analyzed the composition of detrital garnets from Bobal Basin. The results indicate that the garnet of Bobal Basin is mainly of low grossular content and different source areas have different garnet associations, which also proves that provenance analysis of the early stage IS correct.