Late Mesozoic Huangbeiling S-type granite in the East Qinling Orogen,China: Geochronology,petrogenesis and implications for tectonic evolution |
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Authors: | Zesheng Qian Fan Yang Chao Liu Fei Xue M. Santosh Bo Yang Shuai Zhang Sung Won Kim |
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Affiliation: | 1. Key Laboratory of Mineral Resources in Western China (Gansu Province), School of Earth Sciences, Lanzhou University, Lanzhou 730000, China;2. MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;3. Shandong Provincial Lunan Geo-engineering Exploration Institute (The Second Geological Brigade of Shandong Geological Exploration Bureau), Jining 272100, China;4. School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China;5. School of Earth Sciences and Resources, China University of Geosciences Beijing, 29 Xueyuan Road, Beijing 100083, China;6. Department of Earth Sciences, School of Physical Sciences, The University of Adelaide, South Australia 5005, Australia;7. School of Environmental and Life Sciences, College of Engineering Science and Environment, The University of Newcastle, New South Wales 2308, Australia;8. China Aero Geophysical Survey and Remote Sensing Center for Natural Resources, Beijing 100083, China;9. Geological Research Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Republic of Korea |
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Abstract: | S-type granites are typical features of collisional orogenic belts and could provide insights into the tectonic process associated with the final phase of orogeny. The East Qinling Orogen, one of significant segments in the Central China Orogen, witnessed complex tectonic evolution during the Late Mesozoic. The rare S-type granites in this orogen can be used as important proxies to understand the Late Mesozoic tectonic processes. Although a few previous studies suggested that the Huangbeiling pluton in the East Qinling Orogen might be S-type granite, detailed studies are lacking. Thus, we report the results from a systematic petrological, whole-rock geochemical and zircon U-Pb-Lu-Hf isotopic studies on the Huangbeiling pluton, with a view to constrain the timing of magmatism, petrogenetic evolution and genetic type, and to evaluate the implications for Late Mesozoic tectonic evolution of the East Qinling Orogen. Zircon U-Pb analysis yield 206Pb/238U spot ages in the range of 156.7–132.2 Ma, with weighted 206Pb/238U mean ages varying from 146.8 to 141.9 Ma, suggesting the Huangbeiling pluton formed during the Late Jurassic to Early Cretaceous. Zircon Lu-Hf isotopic data show negative εHf(t) values of ?21.5 to ?14.9 and two-stage Hf model ages of 2546–2131 Ma, which are correlated with the Neoarchean to Paleoproterozoic (3.0–2.1 Ga) meta-sedimentary rocks from nearby Taihua Group, indicating that the magma was sourced from reworked ancient crustal components involving meta-sedimentary rocks. Whole-rock geochemical data display enrichment of LREEs, Pb, Hf and Y as well as depletion in HREEs, Ba and HFSEs (e.g., Ta, P, Ti), with weakly negative Eu anomalies. The Huangbeiling granitoids are identified as S-type granites, which generated through partial melting of lower-middle crust and upper crustal fractional crystallization in syn-collisional settings. In conjunction with published information related to the tectonic evolution of the East Qinling Orogen, we propose that the Late Mesozoic Huangbeiling S-type granites might response to the complex tectonic evolution related to extensional tectonics induced by multi-directional (intra-continental) subductions from the Yangtze and North China Cratons as well as the Paleo-Pacific Plate during the Late Mesozoic. |
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Keywords: | Geochemistry Zircon U-Pb-Lu-Hf isotopes S-type granite Tectonic evolution Huangbeiling pluton East Qinling Orogen |
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