摘要
采用阴极发光特征、地球化学特征相结合的方法,对震旦系灯影组、寒武系以及中二叠统热液作用进行对比研究。可见震旦系灯影组、寒武系以及中二叠统鞍形白云石分布及特征有明显差异,震旦系灯影组鞍形白云石阴极发光呈亮红色C-O同位素投点处于流体作用与低温蚀变碳酸岩过渡区域,均一法温度高于同期海水,稀土元素特征与二叠系火成岩差异较大;中二叠统鞍形白云石阴极发光呈红光,均一法温度高于同期海水,稀土元素特征与二叠系火成岩相似;寒武系异形白云石阴极发光呈暗红,分布与寒武系白云岩中盐膏模孔、或与盐膏溶蚀孔洞相关。可知震旦系灯影组热液作用是多期次复合型热液作用的结果或与加里东运动有关,中二叠统的热液作用与峨眉地裂运动有关,而寒武系鞍形白云石不一定是热液作用的产物。
In this paper,the cathodoluminescence characteristics and geochemical characteristics of the Sinian Dengying Formation,Cambrian and Middle Permian hydrothermal processes are compared and studied.The distribution and characteristics of saddle dolomite in Sinian Dengying Formation,Cambrian and Middle Permian are obviously different.The cathodoluminescence of saddle dolomite in Sinian Dengying Formation is bright red C-O isotope projection point in the transitional zone between fluid action and low temperature altered carbonate rock.The homogenization temperature is higher than that of the corresponding seawater,and the igneous rocks differ greatly.The cathodoluminescence of saddle dolomite in the Middle Permian is red,and the homogenization temperature is higher than that of the corresponding seawater.The REE characteristics are similar to those of the Permian igneous rocks.The cathodoluminescence of Cambrian heteromorphic dolomite is dark red,which is related to the salt-gypsum mold holes in Cambrian dolomite or the salt-gypsum dissolution holes.It is concluded that the hydrothermal process of Sinian Dengying Formation is the result of multi-stage complex hydrothermal process or related to Caledonian movement,the hydrothermal process of Middle Permian is related to Emei geofission movement,and the hydrothermal process of Middle Permian is related to Emei geofission movement.Cambrian saddle dolomite may not be the product of hydrothermal action.
作者
张旺
彭博
毛志
ZHANG Wang;PENG Bo;MAO Zhi(Tongren University,Tongren 554300,Guizhou,China;Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China)
出处
《铜仁学院学报》
2018年第12期117-121,共5页
Journal of Tongren University
基金
国家自然科学基金青年科学基金项目(41602125)
铜仁市科技计划项目(铜市科研[2016]18号-8)
关键词
四川盆地
热液作用
阴极发光
Sichuan basin
hydrothermal action
cathodoluminescence
