Is the Songshugou Complex, Qinling Belt, China, an Eclogite Facies Neoproterozoic Ophiolite?

Thomas Bader; Lifei Zhang; Xiaowei Li

doi:10.1007/s12583-019-1221-1

Volume 30 Issue 3

Jun 2019

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Journal of Earth Science > 2019 > 30(3): 460-475.

Thomas Bader, Lifei Zhang, Xiaowei Li. Is the Songshugou Complex, Qinling Belt, China, an Eclogite Facies Neoproterozoic Ophiolite?. Journal of Earth Science, 2019, 30(3): 460-475. doi: 10.1007/s12583-019-1221-1

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Thomas Bader, Lifei Zhang, Xiaowei Li. Is the Songshugou Complex, Qinling Belt, China, an Eclogite Facies Neoproterozoic Ophiolite?. Journal of Earth Science, 2019, 30(3): 460-475. doi: 10.1007/s12583-019-1221-1

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Is the Songshugou Complex, Qinling Belt, China, an Eclogite Facies Neoproterozoic Ophiolite?

doi: 10.1007/s12583-019-1221-1

1.
Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China

Funds:

the Open Research Project of the State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences GPMR201820

the National Natural Science Foundation of China 41872066

the National Natural Science Foundation of China 41750110483

the National Natural Science Foundation of China 41730426

the National Natural Science Foundation of China 41350110224

More Information

Corresponding author: Thomas Bader
Received Date: 21 Nov 2018
Accepted Date: 21 Mar 2019
Publish Date: 01 Jun 2019

Abstract

Abstract

Ophiolites play a key role in understanding subduction-accretion-collision processes. Herein, we discuss origin and metamorphic evolution of an enigmatic, Neoproterozoic ophiolite candidate-the mafic-ultramafic Songshugou Complex, Qinling belt, China-summarizing published thermobarometry, U/Pb geochronology, and geochemistry and presenting new phase equilibrium modeling. Garnet, rarely preserved in amphibolites of the Songshugou Complex, has prograde zoning and low-pyrope cores[Alm_54-71 (Grs+And)_25-30Prp_1-6Sps_5-12]. It formed at quartz eclogite facies conditions of 1.93-2.54 GPa, 462-542¦. During exhumation, garnet first was mantled by plagioclase-rich coronas at about 0.7-1.2 GPa, 660-710¦. During an isothermal uplift to 0.5-0.8 GPa, these coronas evolved widely into σ-shaped aggregates and eventually into whitish ribbons oriented with a steeply southwest dipping mineral stretching lineation. The exhumation into middle-upper crustal levels proceeded till the Late Devonian. The oceanic protoliths of the eclogites were emplaced into continental crust in the Neoproterozoic and dragged into a subduction zone in North Qinling in the Cambrian. The ultramafic rocks of the Songshugou Complex were not subducted with the mafic rocks in a coherent block given the absence of garnet but ubiquitous occurrence of spinel implies a P maximum of~1.7 GPa. Rather, mafic and ultramafic rocks belonged to downgoing and overriding plate, respectively. They were juxtaposed at 0.8-1.7 GPa at Early Ordovician time.
- Qinling belt,
- Songshugou Complex,
- garnet isopleth thermobarometry,
- eclogite,
- Early Paleozoic

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References(98)

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