新聞動態(tài)2025.09.09?Mountain Building, Erosion, Chemical Weathering, Carbon and Neogene Global
? ? ? ? 應(yīng)閆義研究員邀請， 倫敦大學學院地球科學系Peter D. Clift教授將于9月9日（周二）訪問我所并在綜合樓602會議室做學術(shù)報告，歡迎大家參加并積極討論！
? ? ? ? 報告題目：Mountain Building, Erosion, Chemical Weathering, Carbon and Neogene Global
? ? ? ??報 告 人：Peter D. Clift教授
? ? ? ? 報告時間：9月9日（周二）上午10:00
? ? ? ? 報告地點：綜合樓602會議室? ??
? ? ? ?報告人簡介：? ? ??? ? ??
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? ? ? Peter D. Clift教授現(xiàn)任倫敦大學學院地球科學系教授，并榮獲皇家學會-沃爾夫森研究員榮譽。他主要從事大陸邊緣地層發(fā)育、亞洲季風演化以及構(gòu)造運動、地表過程和氣候變化之間相互作用等研究。他曾獲得多項國際榮譽，包括美國地球物理聯(lián)盟（AGU）會士、美國地質(zhì)學會會士、倫敦地質(zhì)學會Lyell獎?wù)?、倫敦地質(zhì)學會Murchison獎、中國科學院國際訪問學者獎學金等。他曾參與多次國際大洋鉆探計劃（IODP）航次,并曾擔任IODP 355航次首席科學家。他的學術(shù)成果顯著，成果主要發(fā)表于Nature, PNAS,Nature Geoscience, Nature Communications, Geology和EPSL等國際高水平刊物上，總引用數(shù)超過27000次。
? ? ?? ?報告摘要：? ? ? ?
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.
