论中国盐溶角砾岩的特征和分类

ON THE CHARACTERISTICS AND CLASSIFICATION OF EVAPORITE-SOLUTION BRECCIA IN CHINA

中国的蒸发岩矿床非常丰富,与蒸发岩在成因上密切相关的盐溶角砾岩极其发育。本文简述了中国盐溶角砾岩的分布,总结了盐溶角砾岩的一般特征,划分出盐溶角砾岩的主要类型,探讨了盐溶角砾岩与盐泉的关系。

As a secondary product at or close to the surface of evaporite, evaporire-solution breccia may be attributed to desalting of evaporite and collapsing of the hanging wall rock under the complicated conditions of dynamic and physico-chemical processes.Comprehensive research on the product permits to elucidate sedimentary regime of evaporite and hence to predict,prospect and evaluate salt minerals. This breccia occurred in association with evaporites developed in long geological time, from Proterozoic, Sinian, Cambrian, Ordovicion, Triassic, Jurassic, Cretaceous to Tertiary in China. The breccia has its characteristics of evaporites and displays also the indications for its secondary genesis. Ten main characteristics of the breccia are summarized by the author, basing on systematic investigation of it in salt-bearing sequences of different geological ages in China. The breccia has evident significance in geological studies. According to metamorphic grade, clastic compoition, and matrix composition, the author makes a classification of the breccia. 1. Metamorphic 2. As evaporite-solution breccia's 'twin sister', salt spring is probably formed in a secondary process from the breccia. Thus, the salt spring is also an important indication for exploration of deep evaporite deposits.