摘要
作者以巢县地区震旦系到三叠系的碳酸盐岩为例，探讨了在不同成岩环境下，碳酸盐岩中微量元素Ｓｒ、Ｎａ、Ｆｅ、Ｍｎ的分布特征。主要经历了大气淡水成岩作用的灰岩（奥陶系、石炭系和州组上部、黄龙组、船山组）有较低的Ｓｒ（１８８×１０^（－６））、Ｎａ（１３２×１０^（－６））、Ｍｎ（１４９×１０^（－６））含量；而以海底成岩作用为主的灰岩（石炭系金陵组、和州组下部、二叠系栖霞组、三叠系南陵湖组），则有较高的Ｓｒ（５１５×１０^（－６））、Ｎａ（３９６×１０^（－６））、Ｍｎ（４０４×１０^（－６））值；与以准同生后成岩白云岩化作用为主的多成因白云岩（震旦—寒武系）相比，准同生的萨布哈白云岩（三叠系东马鞍山组）有稍高的Ｓｒ（１３８×１０^（－６））、Ｎａ（８０６×１０^（－６）），而前者的Ｓｒ、Ｎａ含量分别为１０３×１０^（－６）、６０４×１０^（－６）。Ｍｎ的含量在两类白云岩中差异不明显。与灰岩相比，白云岩化作用将有较高的Ｎａ和较低的Ｓｒ、Ｍｎ。此外，Ｆｅ的含量与Ｃａ＋Ｍｇ含量呈负相关趋势明显，这表明了陆源物质对于Ｆｅ的干扰不容忽视。
Abstract The paper deals with the distribution of trace elements, such as Sr. Na, Fe. Mn in carbonate rocks occurred under various diagenetic environments with a case study of the carbonate rocks (Z-T) in the Chao County. The limestones (O, upper part of C1h . C2h .C2c) origined mainly from meteoric diagenesis are characterized by low concentrations of Sr (188ppm), Na (132ppm), Mn(149ppm), while the limestones (Clj, lower part of C1h .P1q, T1n) mainly derived from submarine diagenesis by high concentrations of Sr(515ppm), Na (396ppm), Mn (404ppm).The penecontemporaneous sabkha dolomites (T2d), in comparison with penecontemporaneous-back poly-origin dolomites (Z-∈)which origin mainly from diagenesis dolomitization, has high concentrations of Sr (138ppm), Na (806ppm), and the later have low concentrations of S (103ppm) and Na (604ppm). It is significant for the difference in Mn content between the dolomites. The dolomite rocks, in comparison with the limestones, have high Na and low Sr, Mn. Moreover,it is obvious that Fe content tends to be negative correlation with Ca+Mg content and it is suggested that Fe content should be influenced by terrigenous cleposits.
出处
《石油实验地质》
CAS
CSCD
北大核心
1995年第1期55-62,共8页
Petroleum Geology & Experiment
基金
"七五"国家重点科技攻关项目
