摘要
化学地层学是近十年兴起的一门将地层学,地球化学和数学地质融为一体的边缘交叉学科。本文介绍了化学地层研究模式,研究历史,重点介绍了研究内容、方法及应用前景。论述了利用常量元素、微量元素、稀土元素、稳定同位素、有机元素在我国前寒武系的研究成果,如S、C、O同位素组成在我国前寒武纪出现了三次较大的间断(即2200—2000Ma,1400Ma,600Ma);S、C同位素演变曲线在前寒武系出现背向演变趋向。此外,利用这些元素对确定沉积盆地古海水温度、酸碱度、古气候及古构造环境亦有重要意义。为取得可信的结论必需建立在大量数据的基础上,文中亦论述了化学地层数据库结构。
Chemostratigraphy is a borderline branch relating to geochemistry, stratigraphy and geomathematics. In this paper, the model and history of studying chemostratigraphy, mainly including its content, method and perspective, are discussed.The author mainly introduces the research results for the Precambrian chemostratigraphy of China, concerning major elements, trace elements, rare earth elements, stable isotopes and organic matter. The main conclusions are as follows:1. There are three breaks (2, 200-2, 000 Ma, 1, 400 Ma and 600 Ma) for S and C isotopic compositions in the Precambrian of China.2. The curves of δ^(34)S and δ^(13)C are characterized by evolution in the opposite directions in the Precambrian.3. It is possible to study paleotectonic environ:nents and paleotemperatures and pH and Eh values of ancient sea water using some elements.4. Chemostratigraphic data bank is introduced in this paper.
出处
《地质论评》
CAS
CSCD
北大核心
1991年第3期265-273,共9页
Geological Review
