各位老師和同學(xué)：
應蔣映德研究員邀請，國際知名構造地質(zhì)學(xué)家、美國地球物理學(xué)會(huì )會(huì )士Roberto Weinberg教授近期訪(fǎng)問(wèn)我所，并將于是下周一做“同位素室學(xué)術(shù)報告”2017年第44次報告。歡迎大家參加并積極參與討論！
報告題目：Himalayan Leucogranites: Nature and Impact on Mountain Building
報 告 人：Prof. Roberto F. Weinberg (School of Earth, Atmosphere and Environment, Monash University, Australia)
報告時(shí)間：12月18日（周一）上午10:00
報告地點(diǎn)：綜合樓701會(huì )議室
報告人簡(jiǎn)介:
Roberto Weinberg教授是國際知名構造地質(zhì)學(xué)家，美國地球物理學(xué)會(huì )會(huì )士。他長(cháng)期專(zhuān)注于巖漿分離與運移、巖漿混染/混合與斑巖型銅礦床、大陸伸展作用等方面的研究，在澳大利亞西南部的Yilgarn地體、阿根廷安第斯山脈和喜馬拉雅山南麓的構造演化方面取得顯著(zhù)研究成果。在Geology，EPSL, Tectonics, GSAB等國際重要刊物上發(fā)表論文100余篇。
報告內容簡(jiǎn)介:
Widespread anatexis was a regional response to the evolution of the Himalayan-Tibetan Orogen that occurred some 30 m.yr. after collision between Asia and India. This talk reviews the nature, timing, duration and conditions of anatexis and leucogranite formation, comparing the Greater Himalayan Sequence (GHS), and the Karakoram mountains. Himalayan leucogranites and migmatites generally share a number of features, such as similar timing and duration of magmatism, common source rocks and clockwise P-T paths. Despite these common aspects, most papers emphasize how anatectic rocks in different regions deviate from this general pattern, indicating a fine-tuned local response to the dominant driving forces. The impact of melting on the evolution of the Himalayas has been widely debated. The weakening of the crust due to melting has been used to support channel flow models for extrusion of the GHS from underneath Tibet, or alternatively, to suggest it triggered a change in the critical taper of the front or a combination. In view of the wide variety of timing of anatexis and activation of the STD, it is plausible that anatexis had only a second-order effect in modulating strain distribution in the Himalayas, with little effect on the general arc shape of the orogen. The arc shape was maintained because forward movement was fundamentally controlled by the imposed convergence history rather than local responses.