Accumulation and Quantitative Assessment of Terrigenous Organic Matter in Upper Oligocene to Lower Miocene Marine Source Rocks of the Qiongdongnan Basin
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View abstract on PubMed
Summary
This summary is machine-generated.Terrestrial organic matter significantly enriches marine source rocks in the Qiongdongnan Basin. The East Asian summer monsoon controlled organic carbon accumulation, not marine algae bioproductivity.
Area Of Science
- Geochemistry
- Organic geochemistry
- Sedimentology
Background
- Marine source rocks often exhibit dual-source characteristics, integrating both marine and terrigenous organic matter.
- Understanding the contribution of terrestrial organic matter is crucial for characterizing marine source rocks.
Purpose Of The Study
- To quantitatively assess the terrestrial organic matter contribution to marine source rocks in the Qiongdongnan Basin.
- To investigate the role of terrestrial organic materials in organic matter enrichment during the late Oligocene to early Miocene.
Main Methods
- Partial least-squares analysis utilizing eight biomarker parameters (n-alkanes, isoprenoids, bicadinanes, taraxerane, tricyclic terpanes, gammacerane).
- Analysis of oleanane and bicadinane content to infer differential unloading of terrestrial organic matter based on sedimentary facies.
Main Results
- Terrestrial organic matter content varied with sedimentary facies, highest in delta front (70%), followed by prodelta (59%) and inner shallow marine (57%).
- The proportion of terrestrial organic matter in marine source rocks increased from late Oligocene to early Miocene, ranging from 46% to 69%.
Conclusions
- Terrestrial organic material input and preservation, influenced by the East Asian summer monsoon, were the primary drivers of organic carbon accumulation.
- Water column redox conditions played a role in the extent of organic matter enrichment.
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