川西南晚奥陶世五峰期岩相古地理

通过对川西南汉源—马边—雷波地区典型剖面上奥陶统五峰组沉积岩性特征、充填序列、沉积构造及室内分析等研究,并结合研究区晚奥陶世构造特征,将川西南地区五峰期分为2期,划分为潮坪、浅水陆棚和深水陆棚3种沉积相。指出在晚奥陶世五峰早期,受加里东构造运动影响,扬子与华夏陆块发生构造挤压碰撞,川中、黔中等边缘隆起抬升扩大,上扬子地区由克拉通海相盆地转为被隆起围限的隆后盆地,除川中隆起、川西—滇中隆起周缘沉积潮坪相白云质页岩、泥灰岩和白云质灰岩外,川西南绝大部分面积主要发育深水陆棚相炭质页岩和硅质页岩、含炭粉砂质页岩。五峰晚期,伴随着全球性冰期事件的发生,研究区乃至整个上扬子区发生大规模海退,大面积的深水陆棚相转为浅水陆棚沉积,岩性主要为粉砂质页岩、泥灰岩、钙质炭质页岩和硅质灰岩等,较前期钙质成分明显增多。

Lithofacies palaeogeography in Late Ordovician Wufeng Age in southwestern Sichua

Abstract: According to the lithological characteristics, filling sequences, sedimentary structures and lab analysis of Late Ordovician Wufeng Formation, combined with the structural features, the authors divided the Wufeng Age in southwestern Sichuan into two periods, and the southwestern Sichuan can be divided into tidal-flat facies and deep shelf and shallow shelf facies. In the Late Ordovician early Wufeng Age, affected by the Caledonian Movement and the continuous extrusion and collision between Yangtze and Cathaysia blocks, the Central Sichuan and Guizhou were increasingly uplifted, and the Upper Yangtze region was submerged and transformed into carbonate ramp, and finally developed into the back-bulge basin confined by the marginal uplifts. Tidal flat facies were developed around Central Suchuan and Western Sichuan-Central Yunnan uplifts with dolomitic shales, muddy limestones and dolomitic limestones. Large areas of western Sichuan developed deep shelf facies which deposited carbonaceous shales, siliceous and carbonaceous-silty shales. In the late Wufeng Age of Late Ordovician, with the emergence of the worldwide glacial event, large-scale regression started in the study area and even in the whole Upper Yangtze area, shallow shelf facies replaced deep shelf facies with silty shales, muddy limestones, calcareous-carbonaceous shales and siliceous limestones, and they had more calcium in comparison with those in former periods.