TY - JOUR
T1 - Ultrahigh-pressure metamorphism in western Tianshan, China
T2 - Part I. Evidence from inclusions of coesite pseudomorphs in garnet and from quartz exsolution lamellae in omphacite in eclogites
AU - Zhang, Lifei
AU - Ellis, David J.
AU - Jiang, Wenbo
PY - 2002
Y1 - 2002
N2 - Inclusions of coesite pseudomorphs in garnets have been found in type I eclogites interlayered with mafic blueschists and carbonate eclogites, and quartz exsolution lamellae in omphacites have been recognized in type II eclogites with pillow structure in western Tianshan, China. Based on mineralogy and petrology, the metamorphic evolution of western Tianshan eclogites can be divided into three stages: (1) pre-peak, ultrahigh-pressure (UHP), eclogite-facies stage (356-443 °C, 8-10 kb); (2) UHP eclogite-facies stage (496-598 °C, 25.7-26.7 ± 1 kbar); and (3) retrograde epidote blueschist-facies stage (500-530 °C, 10-12 kbar). Consequently, the eclogites from the western Tianshan region of China have undergone unambiguous UHP metamorphism.
AB - Inclusions of coesite pseudomorphs in garnets have been found in type I eclogites interlayered with mafic blueschists and carbonate eclogites, and quartz exsolution lamellae in omphacites have been recognized in type II eclogites with pillow structure in western Tianshan, China. Based on mineralogy and petrology, the metamorphic evolution of western Tianshan eclogites can be divided into three stages: (1) pre-peak, ultrahigh-pressure (UHP), eclogite-facies stage (356-443 °C, 8-10 kb); (2) UHP eclogite-facies stage (496-598 °C, 25.7-26.7 ± 1 kbar); and (3) retrograde epidote blueschist-facies stage (500-530 °C, 10-12 kbar). Consequently, the eclogites from the western Tianshan region of China have undergone unambiguous UHP metamorphism.
UR - http://www.scopus.com/inward/record.url?scp=0036060309&partnerID=8YFLogxK
U2 - 10.2138/am-2002-0707
DO - 10.2138/am-2002-0707
M3 - Article
SN - 0003-004X
VL - 87
SP - 853
EP - 860
JO - American Mineralogist
JF - American Mineralogist
IS - 7
ER -