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Garnet-bearing tonalitic porphyry from East Kunlun, Northeast Tibetan Plateau: implications for adakite and magmas from the MASH Zone

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Abstract

A garnet-bearing tonalitic porphyry from the Achiq Kol area, northeast Tibetan Plateau has been dated by SHRIMP U-Pb zircon techniques and gives a Late Triassic age of 213 ± 3 Ma. The porphyry contains phenocrysts of Ca-rich, Mn-poor garnet (CaO > 5 wt%; MnO < 3 wt%), Al-rich hornblende (Al2O3 ~ 15.9 wt%), plagioclase and quartz, and pressure estimates for hornblende enclosing the garnet phenocrysts yield values of 8–10 kbar, indicating a minimum pressure for the garnet. The rock has SiO2 of 60–63 wt%, low MgO (<2.0 wt%), K2O (<1.3 wt%), but high Al2O3 (>17 wt%) contents, and is metaluminous to slightly peraluminous (ACNK = 0.89–1.05). The rock samples are enriched in LILE and LREE but depleted in Nb and Ti, showing typical features of subduction-related magmas. The relatively high Sr/Y (~38) ratios and low HREE (Yb < 0.8 ppm) contents suggest that garnet is a residual phase, while suppressed crystallization of plagioclase and lack of negative Eu anomalies indicate a high water fugacity in the magma. Nd–Sr isotope compositions of the rock (εNdT = −1.38 to −2.33; 87Sr/86Sri = 0.7065–0.7067) suggest that both mantle- and crust-derived materials were involved in the petrogenesis, which is consistent with the reverse compositional zoning of plagioclase, interpreted to indicate magma mixing. Both garnet phenocrysts and their ilmenite inclusions contain low MgO contents which, in combination with the oxygen isotope composition of garnet separates (+6.23‰), suggests that these minerals formed in a lower crust-derived felsic melt probably in the MASH zone. Although the rock samples are similar to adakitic rocks in many aspects, their moderate Sr contents (<260 ppm) and La/Yb ratios (mostly 16–21) are significantly lower than those of adakitic rocks. Because of high partition coefficients for Sr and LREE, fractionation of apatite at an early stage in the evolution of the magma may have effectively decreased both Sr and LREE in the residual melt. It is suggested that extensive crystallization of apatite as an early phase may prevent some arc magmas from evolving into adakitic rocks even under high water fugacity.

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Acknowledgments

We thank Qian Mao, Yuguang Ma and Ms. Ying Liu for their help with the analytical work. The authors benefited from discussions with Drs Guochun Zhao, Hongfu Zhang, Nengsong Chen, Chunming Wu and Petra Bach. We also appreciate the constructive and encouraging comments of reviewers Ali Polat and Fu-yuan Wu, which helped us to improve and clarify the manuscript. This work was supported by research grants from the National Basic Research Program of China (973 Program) 2007CB411308, NSFC Projects 40421303, 40572043, 40725009 and Hong Kong RGC (HKU 7040/04).

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Authors and Affiliations

  1. Key Laboratory of Isotope Geochronology and Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China

    Chao Yuan, Xianhua Li & Xiaoping Long

  2. Department of Earth Sciences, The University of Hong Kong, Pokflam Road, Hong Kong, China

    Min Sun & Xiaoping Xia

  3. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China

    Wenjiao Xiao, Xiaohan Liu, Kai Ye & Jiliang Li

  4. Department of Applied Geology, Curtin University of Technology, Perth, Australia

    Simon Wilde

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  1. Chao Yuan
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Correspondence to Chao Yuan.

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Yuan, C., Sun, M., Xiao, W. et al. Garnet-bearing tonalitic porphyry from East Kunlun, Northeast Tibetan Plateau: implications for adakite and magmas from the MASH Zone. Int J Earth Sci (Geol Rundsch) 98, 1489–1510 (2009). https://doi.org/10.1007/s00531-008-0335-y

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