%0 Journal Article
%T Discovery of high-pressure pelitic granulite in Ailaoshan orogenic belt, southeastern Tibet, and its tectonic implications<br>青藏高原东南缘哀牢山构造带泥质高压麻粒岩的发现及其构造意义
%A QI XueXiang
%A ZHAO YuHao
%A ZHU LuHua
%A LI ZhiQun
%A <br>戚学祥
%A 赵宇浩
%A 朱路华
%A 李志群
%J 岩石学报
%D 2012
%I 
%X High-pressure pelitic granulite containing porphyroblasts of garnet(Grt),sillimanite(Sil),K-feldspar(Kf) and plagioclase(Pl),and inclusions of spinel(Spl),kyanite(Ky),sapphirine(Spr) and rutile(Rut) have been found from the Ailaoshan orogenic belt,southeastern Tibet,regarded as a key indicator for identification of the boundary between the Indochina and South China blocks.The temperatures and pressures calculated by garnet-biotite-plagioclase-quartz geothermobarometery and hightemperature equilibrium spinel + quartz assemblage show the formation and evolution of the graunlite had experienced clockwise P-T path from high-pressure/-temperature to mid-temperature and low-pressure metamorphism.That are:1) the high-pressure/-temperature metamorphism(HP/HT) is characterized by an assemblage of Ky + Sil + Grt1 + Kf1 + Pl1 + Spr + Ter(Kf + Pl) + Bt1 + Spl + Qtz + Ilm1 + Rut1,and the peak P-T conditions of ≥ 10.4kbar at 850 ～ 919℃;2) the mid-temperature and low-pressure retrogressive metamorphism characterized by an assemblage of Grt2 + Bt2 + Pl2 + Ms + Qtz + Ilm2 + Rut2,and two stage P-T conditions of 4.9 ～ 6.5kbar at 664 ～ 754℃ and 3.5 ～ 3.9kbar at 572 ～ 576℃ respectively.The dynamic metamorphic path was that the metapelitic rock experienced high-pressure/-temperature granulite-facies metamorphism in lower continental crust(≥30km) exhumated to mid-upper crust rapidly,it might be related to the continental collision and underthrusting between the Indochina and South China blocks,and exhumation and slip shearing lately.
%K High-pressure pelitic granulite
%K High-pressure/-temperature metamorphism
%K Continental collision
%K Ailaoshan orogenic belt<br>泥质高压麻粒岩
%K 高压/高温变质作用
%K 大陆碰撞
%K 哀牢山构造带
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=2013B5467E3054B1614CEC199353FCED&aid=098B0100FA077930A75219340E97CCC0&yid=99E9153A83D4CB11&vid=D3E34374A0D77D7F&iid=B31275AF3241DB2D&sid=B1F4011810AAA181&eid=9F5F5A017B7EC6D9&journal_id=1000-0569&journal_name=岩石学报&referenced_num=0&reference_num=47