Geochronology of source materials from high-pressure and ultrahigh-pressure metamorphic rocks in Jurassic sedimentary rocks of Hefei Basin |
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Authors: | Email author" target="_blank">Renwei?LiEmail author Haiqing?Sang Renhu?Zhang Zhuyin?Chu Shuangyin?Li Fuquan?Jin Maosheng?Jiang |
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Institution: | (1) Institute of Geology and Geophysics, Chinese Academy of Sciences, 100029 Beijing, China;(2) Department of Resource and Environment Sciences, Hefei Industrial University, 230026 Hefei, China |
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Abstract: | In this report, it is proven through stable isotopic geochronological study that for the Jurassic sedimentary rocks in the Dushan area of Anhui Province, the source materials derived from high-pressure and ultrahigh-pressure metamorphic rocks are the products of subduction and exhumation of the Yangtze plate under the North China plate during the Triassic period. The cobble of high-pressure or ultrahigh-pressure metamorphic rock in the Fenghuangtai Formation of Hefei Basin has Rb-Sr isotopic isochron age of phengite, apatite and whole rock, 232.1±2.1 Ma (MSWD = 0.59). Plateau ages of 40Ar/39Ar age spectra of detrital phengites in the Sanjianpu and Fenghuangtai formations are concordant, and they are 216.5±0.6 Ma and 217.4±1.3 Ma, respectively. |
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Keywords: | Dabie orogenesis Hefei Basin source materials high-pressure and ultrahigh-pressure metamorphic rocks isotopic ages |
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