Sedimentary facies and palaeogeography of the Lower Triassic Jialingjiang Formation in Sichuan Basin during the salt-forming period
-
摘要: 四川盆地下三叠统嘉陵江组是我国钾盐矿产勘查的重点区域和层位，对其的岩相古地理研究是钾盐研究的一项重要的基础地质工作。本文结合四川盆地古地理背景和古气候条件，通过野外剖面、岩心观察、薄片鉴定等方法，对研究区下三叠统嘉陵江组的沉积相进行了分析研究，共识别出潟湖、潟湖边缘坪和台内滩相三种沉积相类型，并进一步划分出多种微相。在此基础上，通过区域地层对比以及岩相古地理编图，重建了四川盆地下三叠统嘉陵江组岩相古地理演化。结合前人研究认为：四川盆地嘉陵江组整体上属于障壁碳酸盐岩台地沉积环境，自西向东从碳酸盐岩局限海相演化为蒸发台地相。盆地周边水下隆起的障壁作用和干旱炎热气候条件共同影响了嘉陵江组台地咸化的演化过程，海平面升降变化是控制沉积相发育和空间分布的重要因素。最后，基于本研究的资料，编制了嘉陵江组各成盐期的岩相古地理图。Abstract: The Lower Triassic Jialingjiang Formation in Sichuan Basin is the key stratum for potash exploration in China. It is an important basic geological work to study its sadimentary facies and paleogeography. Based on the paleogeographic background and paleoclimatic conditions of Sichuan Basin, the sedimentary facies of the lower Triassic Jialingjiang Formation in the study area are analyzed and studied by means of field section, core observation and thin section identification. Three types of sedimentary facies are identified, including lagoon, lagoon marginal flat and platform beach facies, and a few of microfacies are further divided. Through the study of regional stratigraphic correlation and mapping of sedimentary facies and paleogeography, the evolution of the Lower Triassic Jialingjiang Formation in Sichuan Basin is reconstructed. Combined with previous studies, it is considered that the Jialingjiang Formation in Sichuan Basin belonged to a barrier carbonate platform depositional environment, which evolved from limited marine facies of carbonate to evaporation platform facies from west to east. The barrier of the underwater uplift around the basin and the hot and dry climate conditions affected the evolution process of the platform salinization of the Jialingjiang Formation. The sea level fluctuation was an important factor controlling the development and spatial distribution of the sedimentary facies. Finally, based on the data of this study, the map of sedimentary facies and palegeogrophy of the Jialingjiang Formation in each salt forming period is newly compiled.
-
-
龚大兴，2016.四川盆地三叠纪成盐环境、成钾条件及成因机制[D].成都理工大学.
姜枚，马开义，李普，等，1987.四川盆地东部三叠纪含钾岩层古地磁及物性研究[J].物探与化探，11(4):266-274.
林良彪，陈洪德，朱利东，等，2010.川东嘉陵江组-雷口坡组层序岩相古地理[J].成都理工大学学报(自然科学版)，37(4):446-451.
牟传龙，周恳恳，梁薇，等，2011.中上扬子地区早古生代烃源岩沉积环境与油气勘探[J].地质学报，85(4):526-53.
牟传龙，许效松， 2010.华南地区早古生代沉积演化与油气地质条件[J].沉积与特提斯地质，30(3):24-29.
王鸿祯，1985.主编.中国古地理图集[M].北京:地图出版社.
王一帆,徐胜林,张兵,等2020.川西坳陷西充—梓潼地区下沙溪庙组沉积微相特征[J].沉积与特提斯地质,40(1):35-44.
吴应林，朱洪发，朱忠发，等，1994.中国南方三叠纪岩相古地理与成矿作用[M].北京:地质出版社.
许靖华，何起祥，吴应林，等， 1983.我国西南早中三叠世间“绿豆岩”等时面上下的碳、氧稳定同位素地球化学[J].中国地质科学院成都地质矿产研究所文集， (2): 1-12.
周家云，龚大兴，李萌，2015.四川盆地三叠纪蒸发岩特征，盐盆迁移及其构造控制[J].地质学报，89(11):1945-1952.
朱井泉，1990.四川华蓥山三叠系含膏盐段的碳氧同位素特征及其意义[J].岩石学报，(4):67-74.
-
计量
- 文章访问数: 1884
- PDF下载数: 106
- 施引文献: 0
下载: