科研之友
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摘要
The Permian developed in the Middle-Lower Reaches of the Yangtze River (MLRYR) mostly consisted of carbonate rocks, siliceous rocks, clastic rocks and some shale. The Permian is not only one of the most important source rocks of oil and gas but also one of the most important ore-bearing sequences of copper multimetal ores in the MLRYR. Therefore, it is necessary further to study on the Permian sedimentary facies and palaeogeography in the MLRYR. Permian sediments in the MLRYR had been regarded as mostly belonging to deposit of shallow carbonate platform and secondly to deposit of deep shelf or rift valley. Based on our study for recent years, rich deposits from carbonate slope in Permian have been recognized, the petrofacies is consisted of limestone conglomerate, sand silicic wackestones, siliceous rocks and micrite. The carbonate slope developed mostly in Qixia and Maokou stages and secondly Wujiaping and Changxing stages, and distributed along the trend from Tongling, through Susong and Ruichang, to Daye, and their development may be controlled by faults such as the Jiangnan and Changjiang faults. The sedimentary system of carbonate slope with shallow platform and deep basin provided condition for forming association of oil and gas generating, reserving and caprock, and it can be understood why Permian is important source rocks of oil and gas in South China. The faults can also become the passageway of the hydrothermal and volcanic matter, and the faults and slopes may supply the room for ore-forming, therefore it gave ail explanation to can be chosen for the origin of bedded sulfide ore and exhalative process in the copper-multi metal ore-forming belt of the MLRYR. The Middle-Late Permian faults developing in the MLRYR characterized the stretch feature of the basin, and it reveals spreading toward east of tectonic setting of palaeo-Tethys.
- 出版日期2008-8
- 单位中国科学院地质与地球物理研究所; 中国科学院地质与地球物理研究所兰州油气资源研究中心; 合肥工业大学
