Discovery of granulite from the Fuping area in southern Qinling Mountains and its geological significance |
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Authors: | Chunjing Wei Chonghui Yang Shouguang Zhang Rongshe Li |
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Institution: | WEI Chunjing+1, YANG Chonghui+2, ZHANG Shouguang+2 and LI Rongshe+31. Department of Geology, Peking University, Beijing 100871, China; 2. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China; 3. Institute of Regional Geology, Bureau of Geology and Exploration of Shaanxi Province, Xianyang 712000, China |
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Abstract: | Two-pyroxene-bearing granulites were discovered for the first time in the Hercynian-Indosinian metamorphic belt of the southern Qinling Mountains. The granulites occur in the lower part of the Fuping complex and are dominated by intermediate-acidic rocks intercalated with a small amount of bands and lenses of basic granulites. The main metamorphic minerals include orthopyroxene, clinopyroxene, biotite, plagioclase and quartz, and orthopyroxenes are often retrogressively transformed into amphiboles. The metamorphic conditions have been estimated to be %T%=720-780℃ and %P%=0.6 GPa. The granulite-bearing Fuping complex probably belongs to early Proterozoic in age. Whether it occurs as the crystalline basement of the southern Qinling Hercynian-Indosinian orogenic belt or as a thrusted slice in the collisional process needs further study. |
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Keywords: | granulite Fuping complex Qinling orogenic belt |
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