应我校地球科学与资源学院构造地质教研室的邀请，英国伦敦大学学院地球科学系Peter Clift教授将来我校进行学术交流，并在“岩石圈构造与地球动力学研讨会”作学术报告。

题目：Mountain Building, Erosion, Chemical Weathering, Carbon and Neogene Global Cooling

时间：2025年09月15日 下午16:00 – 18:00

地点：逸夫楼716

报告人简介：

Peter Clift是英国伦敦大学学院地球科学系教授，国际知名的海洋地质学家。他的研究聚焦亚洲与西太平洋边缘海的沉积与气候演化，主要包括：亚洲季风演变、构造-气候相互作用、河流水系演化及从大陆风化历史等。Peter Clift教授是全球范围内该领域权威专家。他的考察足迹遍及全球多个关键地质单元，七次参与大洋钻探计划（ODP/IODP）科考航次，并于2015年担任IODP 355（阿拉伯海）航次共同首席科学家。在利用海洋沉积档案揭示地球系统演变方面成果卓著，获得美国地球物理学会（AGU）会士、美国地质学会（GSA）会士、英国伦敦地质学会莱伊尔奖章。Peter Clift在Nature，Nature Geoscience，Geology等国际知名期刊发表论文近三百篇，截至2025年9月，谷歌学术总引用量28270次，H指数高达89。

报告内容简介：

Reconstructing terrestrial environments is critical if we are to understand the development of major climatic systems. Unfortunately, terrestrial records are often incomplete and hard to date and usually represent a small fraction of the total eroded from mountain belts. However, the clastic record delivered to the oceans provides an archive for looking at large scale environmental change. I applied spectral analytical techniques to look as environmentally sensitive minerals hematite and goethite to reconstruct how seasonality and moisture have changed across Asia and northern Australia during the Neogene. The best records are preserved in hemiplegic sequences rather than turbidite-rich submarine fans. The area has dried since the Mid Miocene, especially during the Late Miocene, with a more recent phase of variable and sometimes wetter, more seasonal conditions during the Plio-Pleistocene. Environments in Australia are decoupled from those in Asia due to the influence from the Indonesian Throughflow, as well as the northward drift of Australia.

Comparison of humidity records with rates of erosion indicate faster erosion during wetter time intervals, as well as at times of rapidly changing climate. The degree of chemical alteration of sediment reaching the ocean does not have a linear relationship with total rainfall because heavy rains result in rapid transport and little time for chemical alteration in floodplains. The total amount of atmospheric CO2 consumed as a result of chemical weathering of the eroded sediment is more strongly linked to the total amount of sediment rather than the degree of alteration experienced prior to sedimentation. Source composition is also critical. This means that fast erosion of the Himalaya and SE Asian islands in the Plio-Pleistocene drove rapid drawdown of CO2 which may have been important in intensifying global cooling. However, an erosional pulse inferred for the Middle Miocene correlates with a warm, wet period although it may help to drive cooling after the Mid Miocene Climatic Optimum. A synthesis of geochemical records from marine depocentres around Asia combined with regional seismically derived sediment budgets is essential if we are to reconstruct the changing environment in monsoon or Asia and assess its influence on global climate.

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