Climate-induced organic matter enrichment in lacustrine basin: Insights from the Palaeogene–Neogene oil shale in the Lunpola Basin (Tibet, China),Geological Journal

当前位置： X-MOL 学术 › Geolog. J. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Climate-induced organic matter enrichment in lacustrine basin: Insights from the Palaeogene–Neogene oil shale in the Lunpola Basin (Tibet, China)
Geological Journal ( IF 1.4 ) Pub Date : 2023-04-30 , DOI: 10.1002/gj.4758
Jiang Lu _{1,

2} , Xiugen Fu _{1,

2,

3} , Qiuding Du _{1,

2} , Ying Nie _{1,

2} , Hengye Wei _{1,

2,

3} , Gang Zhou ₄ , Wenzhi Wang ₄

Affiliation

Lacustrine rift basins are ideal continental settings for understanding organic matter (OM) accumulation mechanisms, because lacustrine deposits are most sensitive to variable climatic and palaeoenvironmental conditions. The Lunpola Basin is a Cenozoic lacustrine rift basin with widespread oil shale depositions that provide a valuable example of triggering factors that controlled OM accumulation. In the investigated interval of the basin, high Si, Ti, Zr, Th, Al and rare earth element concentrations suggest high clastic fluxes during the oil shale deposition. These high clastic fluxes could be attributed to warm and humid climates due to high values of ln(Al₂O₃/Na₂O) and C-value (Ʃ (Fe + Mn + Cr + Ni + V + Co)/Ʃ (Ca + Mg + Sr + Ba + K + Na)). The Lunpola shales and oil shales were deposited in saltwater environments under enhanced dysoxic to anoxic conditions with high palaeoproductivity. In the Lunpola Basin, climate warming can be subdivided into two different stages based on C-value and ln(Al₂O₃/Na₂O) variations. Each stage is consistent with an increase in the primary productivity of the palaeolake. Thus, a model for climate-induced OM enrichment in lacustrine rift basins is proposed, which indicates that climate and primary productivity are the key factors controlling OM accumulation.

更新日期：2023-04-30

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南