CAJ | 학술논문

东营凹陷古近系沙河街组碳酸盐岩的成因一直存在湖相与海相之争.沙四段碳酸盐岩呈厚薄不等的夹层赋于陆相碎屑岩中.本文对研究区代表性碳酸盐岩样品稀土元素地球化学特征的分析表明:东营凹陷古近系沙四段碳酸盐岩的∑LREE＞∑MREE＞∑HREE,MREE相对于HREE富集;不具备Ce/Ce~*负异常特征;Y/Ho值为25.5~34.1,La/La~*值为0.99~1.21;Y/Ho-La/La~*呈负相关关系.所有这些特征均与湖相成因碳酸盐岩一致,沙四段碳酸盐岩的形成应为湖相成因.
동영요함고근계사하가조탄산염암적성인일직존재호상여해상지쟁.사사단탄산염암정후박불등적협층부우륙상쇄설암중.본문대연구구대표성탄산염암양품희토원소지구화학특정적분석표명:동영요함고근계사사단탄산염암적∑LREE＞∑MREE＞∑HREE,MREE상대우HREE부집;불구비Ce/Ce~*부이상특정;Y/Ho치위25.5~34.1,La/La~*치위0.99~1.21;Y/Ho-La/La~*정부상관관계.소유저사특정균여호상성인탄산염암일치,사사단탄산염암적형성응위호상성인.
The carbonate rocks from the 4th member of the Shahejie Formation occur as interbeds in the continental clastic rocks in the Dongying depression, Shangdong. The REE geochemistry of the representative carbonate rock samples is characterized by ΣLREE ＞ΣMREE ＞ΣHREE, MREE enrichment relative to HREE, no Ce/Ce~* negative anomaly, Y/Ho ratios ranging from 25.5 to 34.1, La/La~* ratios ranging from 0.99 to 1.21, and negative correlation of Y/Ho vs. La/La~*. The similarity to the geochemical signatures of the lacustrine carbonate rocks indicates a lacustrine origin of the carbonate rocks in the study area.