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《Geology-geochemistry》 2003-03
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ORIGIN OF LOW-VELOCITY LAYER IN THE LOWER CRUST OF SOUTHWEST TARIM: LIMITS OF VELOCITY AND ATTENUATION FOR PLAGIOCLASE AMPHIBOLITE

YUE Lanxiu1,2, XIE Hongsen1, ZHOU Wenge1, LIU Congqiang1, WU Fengchang1 (1 Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002; 2 Graduate School of the Chinese Academy of Sciences, Beijing 100039)  
Compressional wave velocity (Vp) and attenuation (Q) in amphibolite collected from Kudi, Xinjiang, were measured at high pressure (10 GPa) and high temperature (up to 1200℃) The experimental results showed that Vp and Q values decrease with increasing temperature, reflecting that Vp and Q are influenced by partial melting The relationship of Vp and Q with depth, in the light of the correlations between Vp and Q and temperature and pressure, shows that Vp and Q increase with depth The tendency of increasing is the same as that obtained by seismological studies The lowvelocity layer appears at the depth of 32km, at which the Vp and Q decrease rapidly Seismic study in Tarim and its vicinity yielded the same result The lowvelocity layer is measured from 32km to 44km in the Kuytun, Tianshan and Alamtu areas So it may be concluded that amphibolite probably exits in the lower crust of Southwest Tarim And partial melting is the main reason for the existence of the lowervelocity layer
【Fund】: 国家自然科学基金(10299040和49902020);; 中国科学院创新项目(KJCX-N12)
【CateGory Index】: P542
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