[口头报告]Strontium isotope evidence for continental weathering linked to the early Toarcian Oceanic Anoxic Event in the Tethys Himalaya, Tibet

Strontium isotope evidence for continental weathering linked to the early Toarcian Oceanic Anoxic Event in the Tethys Himalaya, Tibet
编号:2662 稿件编号:1550 访问权限:私有 更新:2023-04-25 18:05:51 浏览:177次 口头报告

报告开始:2023年05月07日 13:48 (Asia/Shanghai)

报告时间:8min

所在会议:[17B] 17B、古生物、古地理与古环境 » [17B-1] 17B-1 古生物、古地理与古环境

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摘要
The early Toarcian of the Early Jurassic was characterized by an interval of global warming, enhanced continental weathering, and oceanic anoxic events (T-OAE, ∼183 Ma). However, the changes in continental weathering intensity in low latitude and its direct relationship with oceanic deoxygenation remains poorly constrained. Here, we present strontium isotope (87Sr/86Sr) data of the Toarcian interval from the Tibetan Himalaya, which was formerly located in the tropical/subtropical zone of the southeastern Tethys. The 87Sr/86Sr ratios of Nianduo display an abrupt positive shift beginning around the Pliensbachian–Toarcian (Pl–To) boundary and reach maximum values (~ 0.70782) in the negative interval of the T-OAE CIE (~ −5.6 to 20.4 m), suggesting enhanced continental weathering and terrigenous influx in the Tethys Himalaya. Stratigraphically higher, the 87Sr/86Sr of Nianduo gradually decrease to background ratios during the recovery phase of the T-OAE CIE, suggesting decline in continental weathering. These observations have a great corresponded with δ44/40Ca records from Peniche and 187Os/188Os records from Bighorn Creek. Notably, the 87Sr/86Sr curves of the Europe shelf and western Tethys increase gradually during the T-OAE CIE and maintain persistent positive values. These distinctions are probably due to differing degrees of hydrographic restriction. Additionally, the discrepancy in absolute 87Sr/86Sr values is due to the possibility that the Tethys Himalaya, Europe Shelf, and western Tethys could have suffered different intensities of continental weathering during the early Toarcian.
The coupled relationship between 87Sr/86Sr ratios and geochemical data suggest that: the 87Sr/86Sr from the European shelf, western Tethys, and Tethys Himalaya all represent the global seawater signal. Continental weathering increases the inflow of terrigenous influx into the ocean, causing high 87Sr/86Sr ratios and possibly elevating primary production, which consumes the dissolved oxygen and then triggers global oceanic anoxia.
关键字
Toarcian Oceanic Anoxic Event,Strontium isotopes,Continental weathering,Tibetan Himalaya
报告人
杨雨波
硕士研究生 成都理工大学

稿件作者
杨雨波 成都理工大学;沉积地质研究院
韩中 成都理工大学;沉积地质研究院
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