Decoupling between Oxygen and Radiogenic Isotopes: Evidence for Generation of Juvenile Continental Crust by Partial Melting of Subducted Oceanic Crust

Xuan-Ce Wang; Qiuli Li; Simon A. Wilde; Zheng-Xiang Li; Chaofeng Li; Kai Lei; Shao-Jie Li; Linlin Li; Manoj K. Pandit

doi:10.1007/s12583-020-1095-2

Volume 32 Issue 5

Oct 2021

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Journal of Earth Science > 2021 > 32(5): 1212-1225.

Xuan-Ce Wang, Qiuli Li, Simon A. Wilde, Zheng-Xiang Li, Chaofeng Li, Kai Lei, Shao-Jie Li, Linlin Li, Manoj K. Pandit. Decoupling between Oxygen and Radiogenic Isotopes: Evidence for Generation of Juvenile Continental Crust by Partial Melting of Subducted Oceanic Crust. Journal of Earth Science, 2021, 32(5): 1212-1225. doi: 10.1007/s12583-020-1095-2

Citation:

Xuan-Ce Wang, Qiuli Li, Simon A. Wilde, Zheng-Xiang Li, Chaofeng Li, Kai Lei, Shao-Jie Li, Linlin Li, Manoj K. Pandit. Decoupling between Oxygen and Radiogenic Isotopes: Evidence for Generation of Juvenile Continental Crust by Partial Melting of Subducted Oceanic Crust. Journal of Earth Science, 2021, 32(5): 1212-1225. doi: 10.1007/s12583-020-1095-2

Citation:

Xuan-Ce Wang, Qiuli Li, Simon A. Wilde, Zheng-Xiang Li, Chaofeng Li, Kai Lei, Shao-Jie Li, Linlin Li, Manoj K. Pandit. Decoupling between Oxygen and Radiogenic Isotopes: Evidence for Generation of Juvenile Continental Crust by Partial Melting of Subducted Oceanic Crust. Journal of Earth Science, 2021, 32(5): 1212-1225. doi: 10.1007/s12583-020-1095-2

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Decoupling between Oxygen and Radiogenic Isotopes: Evidence for Generation of Juvenile Continental Crust by Partial Melting of Subducted Oceanic Crust

doi: 10.1007/s12583-020-1095-2

1.
School of Earth Sciences, Yunnan University, Kunming 650500, China
2.
School of Earth Science and Resources, Chang'an University, Xi'an 710054, China
3.
State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
4.
ARC Centre of Excellence for Core to Crust Fluid Systems and The Institute for Geoscience Research, Department of Applied Geology, Curtin University, Perth 6845, Australia
5.
Department of Geology, University of Rajasthan, Jaipur 302004, India

More Information

Corresponding author: Wang Xuan-Ce, x.wang4@uq.edu.au
Received Date: 27 Apr 2020
Accepted Date: 11 Sep 2020
Publish Date: 01 Oct 2021

Abstract

Abstract

There is increasing evidence indicating that melts derived from subducted oceanic crust and sediments may have played a key role in building continental crust. This mechanism predicts that juvenile arc crust should have oxygen isotope characteristics ranging from mantle-like to supracrustal, but consistent mantle-like radiogenic (Nd-Hf) isotopic signatures. Here we present in-situ zircon U-Pb dating, Hf-O isotope analyses, and whole rock major-trace element and Nd isotope analyses of a granitoid from NW India. In-situ secondary ion mass spectrometry (SIMS) zircon U-Pb dating yields a weighted mean ²⁰⁷Pb/²⁰⁶Pb age of 873±6 Ma for the granitoid. It displays mantle-like zircon ε_Hf(ε_{Hf(873 Ma)}=+9.3 to +10.9) and whole-rock Nd (ε_{Nd(873 Ma)}=+3.5) values but supracrustal δ¹⁸O values, the latter mostly varying between 9‰ and 10‰. The calculated whole-rock δ¹⁸O value of 11.3‰±0.6‰ matches well with those of hydrothermally-altered pillow lavas and sheeted dykes from ophiolites. The major and trace element composition of the granitoid is similar to petrological experimental melts derived from a mixture of MORB+sediments. Thus, the granitoid most likely represents the product of partial melting of the uppermost oceanic crust (MORB+sediments). We propose that the decoupling between Hf-Nd and O isotopes as observed in this granitoid can be used as a powerful tool for the identification of slab melting contributing to juvenile continental crustal growth. Such isotopic decoupling can also account for high δ¹⁸O values observed in ancient juvenile continental crust, such as Archean tonalite-trondhjemite-granodiorite suites.
- zircon,
- Hf-Nd and O isotopes,
- decoupling,
- slab melting,
- Neoproterozoic continental crustal growth

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References(61)

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