| 北羌塘坳陷长蛇山地区夏里组细粒沉积岩形成环境及其对有机质富集的控制作用 |
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| 关键词:Northern Qiangtang depression Changsheshan area Xiali Formation factors controlling organic matter enrichment |
| 基金项目:国家自然科学基金项目(编号: 42102201)和中国地质调查局地质调查项目(编号: DD20242200) |
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| The Formation Environment of Fine-grained Sedimentary Rocks and Its Controlling Effect on Organic Matter Enrichment in the Xiali Formation in Changsheshan Area, Northern Qiangtang Depression |
| The Qiangtang Basin is a Mesozoic Marine hydrocarbon sedimentary basin in China, where the main source rocks have not been definitively confirmed. We herein describe the elemental geochemistry of fine-grained sedimentary rocks of the Xiali Formation in Changsheshan area of Northern Qiangtang depression. Our re-search indicates that the source rocks of the Xiali Formation in Northern Qiangtang Depression have expe-rienced hot, arid conditions and strong chemical weathering during the sedimentary periods. The sedimen-tary water was shallow, salty, and oxygen-poor to anoxic, with a moderate sedimentation rate and terri-genous input. The Changsheshan area of the Northern Qiangtang Depression is adjacent to the provenance denudation area in the west of the central uplift, which contains more terrigenous inputs and frequent submarine volcanic activities. The high primary productivity of the upper ocean caused by terrigenous in-puts and the phosphorus and iron nutrients content carried by the submarine hydrothermal fluid entering the ocean is the main factor contributing to organic matter enrichment. High paleoproductivity in the Chang-sheshan area of Northern Qiangtang Depression is the main factor influencing organic matter enrichment. The anoxic sedimentary environment and moderate terrigenous input are also the important condi-tions for organic matter enrichment. These findings and insights provide a reference for understanding the formation mechanism and predicting the distribution of high-quality source rocks from the Mid-Jurassic sedimentary sequence in Northern Qiangtang depression. |
| CHEN Cheng,WU Zhenhan,WANG Li,JI Changjun,ZHAO Zhen.2025.The Formation Environment of Fine-grained Sedimentary Rocks and Its Controlling Effect on Organic Matter Enrichment in the Xiali Formation in Changsheshan Area, Northern Qiangtang Depression[J].Acta Geoscientica Sinica,46(3):533-543. |
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