中国四川盆地东部五峰-龙马溪地层富有机质页岩的沉积环境及主要控制因素

IF 1.8 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Frontiers of Earth Science Pub Date : 2024-07-23 DOI:10.1007/s11707-024-1108-z
Yang Wang, Hanyu Zhang, Yanming Zhu, Shangbin Chen, Qingshun Cao, Manli Huang, Jinghui Yang, Yunsheng Zhang
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引用次数: 0

摘要

通过研究五峰-龙马溪地层黑色页岩的垂直变化特征以及无锡白鹿剖面的主要元素和微量元素丰度,探讨了五峰-龙马溪地层黑色页岩有机质的主要控制因素及其富集模式。结果表明,长江上游地台东北缘五峰-龙马溪地层的沉积构造背景位于活动大陆边缘,为被动大陆边缘和大陆岛弧。源区母岩主要为长粒火山岩,混有少量沉积循环物质。由于板块活动增加和海平面下降,原生火成岩输入量增加。古气候处于半湿润状态,缺氧还原环境旺盛,古生产率高,形成了五峰组富含有机质的页岩。在龙马溪地层的底部,沉积水体受到全球横断的影响,呈现出强烈的缺氧还原环境,古气候为温暖湿润。古生产力水平较高,形成了有机页岩。由于龙马溪地层顶部海平面下降,沉积水处于缺氧还原环境,但原生火成岩物质的输入量增加。由于古气候温暖潮湿,古生产力水平高,因此形成了富含有机质的页岩。研究结果表明,陆相碎屑岩的输入环境、古生产率条件和古氧化还原条件对五峰-龙马溪地层有机质富集的影响最大。因此,有机质富集受多种古环境因素的控制。
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Sedimentary environment and major controlling factors of organic matter-rich shale from the Wufeng-Longmaxi formation in eastern Sichuan Basin, China

The major controlling factors of organic matter and its enrichment model of the black shale from the Wufeng-Longmaxi Formation were explored by investigating the vertical variation characteristics, as well as major element and trace element abundances in the Wuxi Bailu section. The results show that the sedimentary tectonic setting of the Wufeng-Longmaxi Formation in the north-east margin of the upper Yangtze platform is located on the active continental margin, which is a passive continental margin and continental island arc. The parent rock in the source area is mainly felsic volcanic rocks mixed with small amounts of sedimentary recycling materials. Due to increased plate activity and a drop in sea levels, terrigenous pyroclastic input increased. The palaeoclimate was semi-humid, and a robust dysoxic-reduction environment and a high level of palaeoproductivity, causing the formation of the organic-rich shale in the Wufeng Formation. At the base of the Longmaxi Formation, the sedimentary water body was affected by global transgression, showing a strong anoxic-reductive environment, and the paleoclimate was a warm and humid condition. The palaeoproductivity level was high, resulting in the formation of organic shale. Due to the sea level drop at the top of the Longmaxi Formation, the sedimentary water was in an oxic-reduced environment, but the input of terrigenous pyroclastic matter increased. Because the paleoclimate was warm and humid and the palaeoproductivity level was high, organic-rich shale was formed. The findings demonstrate that terrigenous clastic input circumstances, palaeoproductivity conditions, and paleoredox conditions had the greatest influence on the enrichment of organic matter in the Wufeng-Longmaxi Formation. Thus, organic matter enrichment was controlled by multiple paleoenvironmental factors.

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来源期刊
Frontiers of Earth Science
Frontiers of Earth Science GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.50
自引率
5.00%
发文量
627
期刊介绍: Frontiers of Earth Science publishes original, peer-reviewed, theoretical and experimental frontier research papers as well as significant review articles of more general interest to earth scientists. The journal features articles dealing with observations, patterns, processes, and modeling of both innerspheres (including deep crust, mantle, and core) and outerspheres (including atmosphere, hydrosphere, and biosphere) of the earth. Its aim is to promote communication and share knowledge among the international earth science communities
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