Nd-Hf Isotopic Decoupling of the Silurian-Devonian Granitoids in the Chinese Altai: A Consequence of Crustal Recycling of the Ordovician Accretionary Wedge?

Yanqiong Huang; Yingde Jiang; Yang Yu; Stephen Collett; Sheng Wang; Tan Shu; Kang Xu

doi:10.1007/s12583-019-1217-x

Volume 31 Issue 1

Jan 2020

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Journal of Earth Science > 2020 > 31(1): 102-114.

Yanqiong Huang, Yingde Jiang, Yang Yu, Stephen Collett, Sheng Wang, Tan Shu, Kang Xu. Nd-Hf Isotopic Decoupling of the Silurian-Devonian Granitoids in the Chinese Altai: A Consequence of Crustal Recycling of the Ordovician Accretionary Wedge?. Journal of Earth Science, 2020, 31(1): 102-114. doi: 10.1007/s12583-019-1217-x

Citation:

Yanqiong Huang, Yingde Jiang, Yang Yu, Stephen Collett, Sheng Wang, Tan Shu, Kang Xu. Nd-Hf Isotopic Decoupling of the Silurian-Devonian Granitoids in the Chinese Altai: A Consequence of Crustal Recycling of the Ordovician Accretionary Wedge?. Journal of Earth Science, 2020, 31(1): 102-114. doi: 10.1007/s12583-019-1217-x

Citation:

Yanqiong Huang, Yingde Jiang, Yang Yu, Stephen Collett, Sheng Wang, Tan Shu, Kang Xu. Nd-Hf Isotopic Decoupling of the Silurian-Devonian Granitoids in the Chinese Altai: A Consequence of Crustal Recycling of the Ordovician Accretionary Wedge?. Journal of Earth Science, 2020, 31(1): 102-114. doi: 10.1007/s12583-019-1217-x

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Nd-Hf Isotopic Decoupling of the Silurian-Devonian Granitoids in the Chinese Altai: A Consequence of Crustal Recycling of the Ordovician Accretionary Wedge?

doi: 10.1007/s12583-019-1217-x

Yanqiong Huang^{1,2
,},
Yingde Jiang^{1
,
,
,},
Yang Yu¹,
Stephen Collett³,
Sheng Wang^1,2,
Tan Shu^1,2,
Kang Xu^1,2

1.
State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
Center for Lithospheric Research, Czech Geological Survey, Prague, Czech Republic

More Information

Corresponding author: Yingde Jiang
Received Date: 14 Nov 2018
Accepted Date: 10 Apr 2019
Publish Date: 01 Feb 2020

Abstract

Abstract

Voluminous Silurian-Devonian granitoids intruded a greywacke-dominated Ordovician accretionary wedge in the Chinese Altai. These granitoids are characterized by significant Nd-Hf isotopic decoupling, the underlying mechanism of which, so far, has been poorly understood. This issue is addressed in this study by the integration of our new and regional published geological and geochemical data. Geological studies indicated a close spatial relationship between the regional anatexis of the Ordovician wedge and the formation of the granitoids, which is characterized by a gradual textural evolution from the partial molten Ordovician wedge sedimentary rocks (the Habahe Group) to the granitoid bodies. Compositionally, these granitoids and the Ordovician Habahe Group rocks displayed close geochemical similarities, in the form of arc-like trace elemental signatures as well as comparable Nd isotopic characteristics. Combined with regional available data, we suggest that the Silurian-Devonian granitoids originated from the immature and chemically primitive Habahe Group rocks. Since Nd and Hf isotopic data for the Habahe Group rocks show significant Nd-Hf isotopic decoupling, we propose that the Silurian-Devonian granitoids inherited the Nd and Hf isotopic signatures from their sources, i.e., the Habahe Group rocks. In other words, the Nd-Hf decoupling in the Habahe Group rocks is the primary causative factor leading to the prevailing Nd-Hf isotopic decoupling of the Silurian-Devonian granitoids in the Chinese Altai.
- granitoids,
- crustal recycling,
- Ordovician wedge sediments,
- partial melting,
- Nd-Hf decoupling,
- Chinese Altai,
- geochemistry

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References(94)

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