塔里木盆地东部地区寒武系-奥陶系白云岩特征及成因

Genesis of the Cambrian-Ordovician dolostones in the eastern Tarim Basin,Xinjiang

School of Resources and Information Technology, China University of Petroleum, Beijing 102249, China

摘要: 通过对塔东低凸起带寒武系-奥陶系白云岩的岩石学特征、碳氧同位素特征、锶同位素比值特征、有序度等的分析,认为塔东地区带寒武系-奥陶系准同生阶段的泥-粉晶白云岩由受潮汐作用的海水泵汲作用形成;成岩阶段的细-中晶白云岩、粗-巨晶白云岩是在埋藏成岩环境中经过调整白云岩化以及成岩后期的外来热液作用引起的埋藏热液白云岩化作用形成。
- 层状白云岩 /
- 准同生白云岩 /
- 海水泵汲作用 /
- 成岩白云岩 /
- 调整白云岩化 /
- 热液白云岩化
Abstract: The laterally persistent dolostones in the eastern Tarim Basin,Xinjiang are of important significance of research.Three genetic models are constructed on the basis of lithology,carbon and oxygen isotopes,strontium isotopic ratios,and ordering degree.The penecontemporaneous micritic dolostones are generated by the sea-water pumping due to tidal effects in the subtidal reducing conditions during the penecontemporaneous stages.The fine-to medium-crystalline dolostones and coarse-crystalline dolostones result from regulation dolomitization in the burial diagenetic conditions,and hydrothermal dolomitization in the deeper parts.
- stratified dolostone /
- penecontemporaneous dolostone /
- sea-water pumping /
- diagenetic dolostone /
- regulation dolomitization /
- hydrothermal dolomitization