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| Organic matter accumulation in limestone—marl alternations of the Middle Permian Maokou Formation, Sichuan Basin, China, and its response to the interglacial—glacial transition |
| Feng—Bin Liu a,b, Liang—Biao Lin a,b,*, Bo—Lin Zhanga,b, Yu Yua,b, Yong Danc, Si—Yu Liua,b |
aState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation and Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, 610059, Sichuan, China;
bKey Laboratory of Deep—Time Geography and Environment Reconstruction and Applications of Ministry of Natural Resources, Chengdu University of Technology, Chengdu 610059, Sichuan, China;
cChengdu Center, China Geological Survey, Chengdu 610081, Sichuan, China |
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Abstract The deposition of limestone—marl alternations (LMAs) with elevated organic matter (OM) content within the Middle Permian (Guadalupian) Maokou Formation of the Sichuan Basin, China, was influenced by the interglacial—glacial transition. However, the mechanisms of OM accumulation remain unclear. This study examines OM accumulation in the first member of the Maokou Formation (i.e., the Mao I Member) from the Hegou and Zaodu sections using multiple geochemical proxies, with a focus on its response to climatic shifts during the interglacial—glacial transition. OM accumulation was primarily influenced by this climatic transition through two interrelated processes: (1) by regulating the intensity of chemical weathering (Rb/Sr) in nearshore shallow—platform environments, which in turn controlled terrigenous nutrient input (Ti/Al); and (2) by enhancing upwelling in distal deeper waters (Cd/Mo), thereby stimulating primary productivity (OCAR, PAR, CuXS, and NiXS). These mechanisms overcame the typical constraints of an oxygenated carbonate platform setting (where Ce anomalies are mostly <1.3), exerting a stronger control on OM accumulation than redox conditions. As glacial conditions intensified, the dominant mode of OM accumulation in the Mao I Member shifted from a detrital—driven regime—characterized by high terrigenous input (Ti/Al) and clay—mediated preservation (Al2O3)—to a hybrid system jointly regulated by both detrital input and upwelling—related nutrient delivery (Cd/Mo). In this latter phase, enhanced upwelling compensated for the decline in terrigenous nutrients. OM accumulation persisted even under oxygenated bottom—water conditions. This finding contrasts with the anoxia—dependent models typical of high OM shales and underscores the predominance of productivity over preservation factors in this icehouse carbonate platform. The transition toward glacial conditions is evidenced by the decreasing Rb/Sr ratios, indicating weakened chemical weathering, and declining Ti/Al ratios, signifying reduced terrigenous input. Our findings elucidate how multi—factor interactions govern OM accumulation in mixed carbonate—clastic systems and provide valuable constraints for predicting the stratigraphic distribution and quality of potential hydrocarbon source rocks in such settings.
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Received: 14 May 2025
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Corresponding Authors:
*State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation and Institute of Sedimentary Geology, Chengdu, 610059, China. E—mail addresses: liufb0620@126.com (F.—B. Liu), linliangbiao08@cdut.cn (L.—B. Lin), zhangbolin@cdut.edu.cn (B.—L. Zhang), yuyucdut@163. com (Y. Yu), dy920@qq.com (Y. Dan), 1530825254@qq.com (S.—Y. Liu).
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2026, Vol. 15 
