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1. 长江大学地球科学学院
2. 中国地质大学(武汉)构造与油气重点实验室
Online First:17 February 2025,
Published:17 February 2025
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冉倍, 杨向荣, 齐爽怡, et al. 早志留世华南扬子地区大陆风化作用与上升洋流演化及其对龙马溪组黑色页岩有机质富集的指示[J]. Bulletin of Geological Science and Technology, 2025, 44(4): 217-232.
冉倍, 杨向荣, 齐爽怡, et al. 早志留世华南扬子地区大陆风化作用与上升洋流演化及其对龙马溪组黑色页岩有机质富集的指示[J]. Bulletin of Geological Science and Technology, 2025, 44(4): 217-232. DOI: 10.19509/j.cnki.dzkq.tb20240678.
关于华南扬子地区龙马溪组黑色页岩中的有机质富集机制一直存在争议,为揭示古气候条件转变背景下大陆风化作用和上升洋流的演化特征,并探究该地区沉积物中有机质的富集主控因素,以四川省布拖地区布地1井龙马溪组为研究对象,采用地球化学方法重建了早志留世古气候和古海洋水化学条件。研究表明,龙马溪组沉积期化学风化作用展现出逐渐增强的趋势,而水动力条件总体处于停滞局限的状态。龙马溪组早期伴随赫南特冰期的结束,全球气候变暖,冰盖消融促进了河流径流量增加,进而增强了物理剥蚀速率和化学风化速率,并导致了该时期表层海洋较高的生物生产力。此外,龙马溪组富有机质黑色页岩沉积存在时间和空间序列上的差异性。在时间序列上主要受到强烈气候波动下的大陆风化作用演化影响,即龙马溪组早期强烈的化学风化速率促进了有机质的富集;而在空间尺度上与扬子地区的上升洋流强度有关,即在扬子海外陆棚地区强烈的上升洋流促进了有机质和有机硅的富集。本研究揭示了研究区早志留世重大地质事件驱动下的有机质富集机制,总结了华南扬子地区空间上龙马溪组富有机质页岩的差异发育模式,可为华南龙马溪组页岩中有机质富集模式提供新的视角。
The deposition mechanism of organic-rich shales in the Lower Silurian Longmaxi Formation is still under debate. ObjectiveIn order to reconstruct the climatic and oceanic environments during the Early Silurian
and reveal the influence of continental weathering and upwelling on the organic matter accumulation
Methodsthis study presents the geochemical compositions of the Lower Silurian succession in the BD 1 Well of the Upper Yangtze Platform. ResultsThe results show that despite persistently restricted watermass conditions
the Longmaxi period experienced a transition from weak chemical weathering intensity in the early period to intense chemical weathering in the late period. During the early stage of Longmaxi Formation deposition
coinciding with the termination of the Hirnantian glaciation
global climatic warming and associated deglaciation induced a significant increase in fluvial runoff. This amplified runoff intensified continental weathering and erosion rates
concurrently elevating primary productivity. The deposition of organic-rich black shale within the Longmaxi Formation exhibits distinct spatiotemporal heterogeneity. Temporally
the evolution of continental weathering was modulated by pronounced climatic fluctuations. Only episodes of intense weathering facilitated the enrichment of organic matter within the Lower Longmaxi Formation. Spatially
across the Yangtze Sea paleoshelf
organic matter and biogenic silica enrichment was primarily driven by strong upwelling dynamics specific to the outer shelf setting
contrasting with the inner shelf regions. ConclusionThis study reveals the mechanisms of organic matter enrichment in the study area during the Early Silurian. It summarizes the diverse spatial development patterns of organic-rich shale in the Longmaxi Formation of the Yangtze Block of South China
providing new perspectives for understanding organic matter enrichment mechanisms within the Longmaxi Formation.
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