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      報告題目：Mantle transition zone beneath the central Tien Shan: possible lithospheric delamination and mantle plumes
      
										
      
											撰稿：       
											    
											發(fā)布時(shí)間：2017-12-01 

										
      
										
      各位老師和同學(xué)： 
      應鄧陽(yáng)凡副研究員和孫新蕾研究員邀請，俄羅斯科學(xué)院地球物理研究所Lev Vinnik教授近期訪(fǎng)問(wèn)我所，并將于本周三做“同位素室學(xué)術(shù)報告”2017年第41次報告。歡迎大家參加并積極參與討論！ 
      報告題目：Mantle transition zone beneath the central Tien Shan: possible lithospheric delamination and mantle plumes 
      報 告 人 ： Prof. Lev Vinnik（俄羅斯科學(xué)院地球物理研究所） 
      報告時(shí)間：11月22日（周三）上午10:00 
      報告地點(diǎn)：綜合樓701會(huì )議室 
      報告人簡(jiǎn)介: 
      Lev Vinnik 教授，主要從事地震學(xué)，構造地球物理，地球動(dòng)力學(xué)方面的研究。歐洲科學(xué)院院士，AGU Fellow, EGU Gutenberg medal獲得者，美國地震學(xué)會(huì )Reid medal 獲得者。 
      報告摘要: 
      We investigate structure of the mantle transition zone (MTZ) under the central Tien Shan by using recordings of seismograph stations in Kyrgyzstan, Kazakhstan and adjacent North-western China. Our data reveal a reduction of thickness of the MTZ of 10 - 15 km under the Fergana basin, in the neighborhood of the region of small-scale basaltic volcanism at the time near the Cretaceous-Paleogene boundary. The reduced thickness of the MTZ is the effect of a depressed 410-km discontinuity, similar to that found in many hotspots. This depression suggests a positive temperature anomaly of about 100- 150 K, consistent with the presence of a thermal mantle plume. A similar depression on the 410-km discontinuity is found under part of the Tarim basin.
      
									
      
								
      
								
      
												
					
      
						
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