Confirmation of pelitic granulite in the Altai orogen and its geological significance |
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| Authors: | Wei Wang ChunJing Wei Tao Wang YuXing Lou and Hang Chu |
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| Institution: | (1) MOE Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing, 100871, China;(2) School of Geosciences, University of Sydney, Sydney, 2006, Australia;(3) Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China |
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| Abstract: | The existence of pelitic granulite in the Altai orogen was confirmed for the first time by detailed petrographic research
and P-T pseudosection modeling. The pelitic granulite has the assemblage of garnet + cordierite + K-feldspar + biotite + sillimanite
+ plagioclase + quartz with some samples containing the paragenesis of cordierite + spinel. Peak conditions of the pelitic
granulite determined from the P-T pseudosection involved P = 0.5−0.6 GPa, T = 780−800°C, belonging to medium- to low-pressure type. SHRIMP U-Pb dating of zircon presented a metamorphic age of 292.8
± 2.3 Ma. The discovery of pelitic granulite reflects an extensional environment with high heat flow in the southern margin
of the Altai orogen during the Early Permian, which provides an important petrological constraint on the evolution of the
Altai orogen.
Supported by National Natural Science Foundation of China (Grant No. 40525006), the Ministry of Education of China (Grant
No. 20060001062) and China Survey of Geology |
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| Keywords: | pelitic granulite Altai orogen P-T pseudosection SHRIMP dating |
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