西藏定结高压基性麻粒岩(退变榴辉岩)的变质P-T轨迹及构造意义
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摘要
定结(Dinggye)位于藏南高喜马拉雅结晶岩系的中部,研究该区域麻粒岩的变质P-T轨迹对于理解青藏高原的碰撞和抬升过程至关重要.通过对该地区的高压基性麻粒岩(退变榴辉岩)的岩相学观察,确定了4期矿物组合:(1)峰期榴辉岩相矿物组合(M_1)由石榴子石(核部)+绿辉石(假象)+石英+金红石组成;(2)高压麻粒岩相矿物组合(M_2)主要由石榴子石(幔部)+单斜辉石+斜长石+钛铁矿+角闪石+黑云母组成;(3)中压麻粒岩相矿物组合(M_3)由石榴子石(边缘)+斜方辉石+斜长石+钛铁矿+黑云母组成;(4)角闪岩相矿物组合(M_4)主要由角闪石+斜长石组成.在NCFMASHTO体系下,用THERMOCALC软件对该高压基性麻粒岩进行了热力学模拟.结合传统温压计和平均温压计计算结果,求得M_2、M_3、M_4阶段的温压条件分别为786~826℃、0.78~0.96GPa;798~850℃、0.71~0.75GPa;610~666℃、0.51~0.60GPa,这指示了一条以峰期后近等温降压(ITD)为特征的顺时针P-T轨迹.结合已有地质资料,表明定结高压基性麻粒岩(退变榴辉岩)是喜马拉雅碰撞造山的产物,峰期后经历了近等温降压的构造抬升过程.
Dinggye is located in the central part of the Greater Himalayan crystalline complex(GHC)in southern Tibet.It is essential to investigate the metamorphic P-T path of granulite in this area to better understand the collision and uplifting process of the Tibetan plateau.The petrological study of the high-pressure mafic granulite(retrograded eclogite)from the region indicates four stages:(1)peak eclogite facies mineral assemblage(M_1)consists of garnet(core)+omphacite(psedomorph)+ quartz+rutile;(2)high-pressure granulite facies mineral assemblage(M_2)comprises garnet(mantle)+clinopyroxene+plagioclase+ilmenite+amphibole+biotite;(3)medium-pressure granulite facies assemblage(M_3)is composed of garnet(rim)+orthopyroxene+plagioclase+biotite;(4)amphibolite facies mineral assemblage(M_4)consists ofamphibole+plagioclase.Using the THERMOCALC program,the thermodynamic modeling in the NCFMASHTO system has been undertaken for the high-pressure mafic granulite.Combined with the conventional thermobarometers and the average P-T estimates,the P-Tconditions of the different metamorphic stages are estimated to be 786-826℃,0.78-0.96 GPa(M_2);798-850℃,0.71-0.75 GPa(M_3);and 610-666℃,0.51-0.60 GPa(M_4),respectively,indicating apost-peak clockwise P-T path characterized by nearly isothermal decompression.Combined with geological data available,we propose that the highpressure mafic granulite(retrograded eclogite)of the Dinggye formed during the Himalayan collisional orogeny,and underwent apost-peak tectonic uplift process of nearly isothermal decompression.
Dinggye is located in the central part of the Greater Himalayan crystalline complex(GHC)in southern Tibet.It is essential to investigate the metamorphic P-T path of granulite in this area to better understand the collision and uplifting process of the Tibetan plateau.The petrological study of the high-pressure mafic granulite(retrograded eclogite)from the region indicates four stages:(1)peak eclogite facies mineral assemblage(M_1)consists of garnet(core)+omphacite(psedomorph)+ quartz+rutile;(2)high-pressure granulite facies mineral assemblage(M_2)comprises garnet(mantle)+clinopyroxene+plagioclase+ilmenite+amphibole+biotite;(3)medium-pressure granulite facies assemblage(M_3)is composed of garnet(rim)+orthopyroxene+plagioclase+biotite;(4)amphibolite facies mineral assemblage(M_4)consists ofamphibole+plagioclase.Using the THERMOCALC program,the thermodynamic modeling in the NCFMASHTO system has been undertaken for the high-pressure mafic granulite.Combined with the conventional thermobarometers and the average P-T estimates,the P-Tconditions of the different metamorphic stages are estimated to be 786-826℃,0.78-0.96 GPa(M_2);798-850℃,0.71-0.75 GPa(M_3);and 610-666℃,0.51-0.60 GPa(M_4),respectively,indicating apost-peak clockwise P-T path characterized by nearly isothermal decompression.Combined with geological data available,we propose that the highpressure mafic granulite(retrograded eclogite)of the Dinggye formed during the Himalayan collisional orogeny,and underwent apost-peak tectonic uplift process of nearly isothermal decompression.
引文
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