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Partial melting of oceanic sediments in subduction zones and its contribution to the petrogenesis of peraluminous granites in the Chinese Altai

Published online by Cambridge University Press:  25 January 2018

QUN LUO
Affiliation:
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China Unconventional Natural Gas Institute, China University of Petroleum, Beijing 102249, China
CHEN ZHANG
Affiliation:
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China College of Geoscience, China University of Petroleum, Beijing 102249, China Basin and Reservoir Research Center, China University of Petroleum, Beijing 102249, China
SHU JIANG
Affiliation:
Energy & Geoscience Institute, University of Utah, Salt Lake City 84108, UT, USA
LUOFU LIU
Affiliation:
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China College of Geoscience, China University of Petroleum, Beijing 102249, China Basin and Reservoir Research Center, China University of Petroleum, Beijing 102249, China
DONGDONG LIU
Affiliation:
Unconventional Natural Gas Institute, China University of Petroleum, Beijing 102249, China
XIANGYE KONG
Affiliation:
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China Unconventional Natural Gas Institute, China University of Petroleum, Beijing 102249, China
XIAOYU LIU
Affiliation:
College of Geoscience, China University of Petroleum, Beijing 102249, China
XINPENG WANG
Affiliation:
College of Geoscience, China University of Petroleum, Beijing 102249, China
Corresponding
E-mail address:

Abstract

Late Carboniferous magmatism in the Chinese Altai provides an important view of geodynamic processes active during crustal growth in the Central Asian Orogenic Belt (CAOB). In this study, five representative peraluminous granite plutons from the Chinese Altai were selected for systematic geochronological, geochemical and Sr–Nd–Hf isotopic analyses (Table 1). These granites were emplaced between 449 and 327 Ma in an active subduction zone, and have moderate to high SiO2 (66.54–76.13 wt%), moderate Na2O+K2O (6.27–7.66 wt%), and high Al2O3 contents (12.43–16.18 wt%). All granite samples in this study showed significant decoupling of the Nd and Hf isotope systems. Results show negative εNd(t) values (−3.3 to −0.9), and predominantly positive εHf(t) values (+0.24 to +8.01, n=57) except for a few negative εHf(t) values (−7.44 to −0.03, n=9), high Mg# values (28.69–53.33), high Nd/Hf ratios (4.26–43.57), and enrichment of large-ion lithophile elements (LILEs; e.g. Pb, Th, and U), suggesting that the granites were derived from the partial melting of oceanic sediments and the associated mantle wedge, with fractionation of plagioclase, K-feldspar and biotite. In situ zircon Hf isotopic analyses yield negative εHf(t) values from −30.6 to −13.7 for the zircon xenocrysts. The U–Pb ages and Hf isotopic ratios of these zircon xenocrysts were probably inherited from oceanic sediments. Zircon saturation temperatures suggest that these peraluminous granites were emplaced at 537–765°C. We propose that: (1) the Nd isotopic system more faithfully reflects the source of peraluminous magmas in the Chinese Altai than the Hf isotopic system, and (2) the oceanic sediment recycling was an important process during continental growth in the CAOB.

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Original Article
Copyright
Copyright © Cambridge University Press 2018 

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Partial melting of oceanic sediments in subduction zones and its contribution to the petrogenesis of peraluminous granites in the Chinese Altai
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