Olivine Compositional Mapping of Mafic-Ultramafic Complexes in Eastern Xinjiang (NW China): Implications for Cu-Ni
Mineralization and Tectonic Dynamics

Benxun Su; Kezhang Qin; He Sun; Dongmei Tang; Qinghua Xiao; Pingping Liu; Patrick Asamoah Sakyi

doi:10.1007/s12583-012-0232-y

Volume 23 Issue 1

Feb 2012

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Journal of Earth Science > 2012 > 23(1): 41-53.

Benxun Su, Kezhang Qin, He Sun, Dongmei Tang, Qinghua Xiao, Pingping Liu, Patrick Asamoah Sakyi. Olivine Compositional Mapping of Mafic-Ultramafic Complexes in Eastern Xinjiang (NW China): Implications for Cu-NiMineralization and Tectonic Dynamics. Journal of Earth Science, 2012, 23(1): 41-53. doi: 10.1007/s12583-012-0232-y

Citation:

Benxun Su, Kezhang Qin, He Sun, Dongmei Tang, Qinghua Xiao, Pingping Liu, Patrick Asamoah Sakyi. Olivine Compositional Mapping of Mafic-Ultramafic Complexes in Eastern Xinjiang (NW China): Implications for Cu-Ni Mineralization and Tectonic Dynamics. Journal of Earth Science, 2012, 23(1): 41-53. doi: 10.1007/s12583-012-0232-y

Citation:

Benxun Su, Kezhang Qin, He Sun, Dongmei Tang, Qinghua Xiao, Pingping Liu, Patrick Asamoah Sakyi. Olivine Compositional Mapping of Mafic-Ultramafic Complexes in Eastern Xinjiang (NW China): Implications for Cu-Ni Mineralization and Tectonic Dynamics. Journal of Earth Science, 2012, 23(1): 41-53. doi: 10.1007/s12583-012-0232-y

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Olivine Compositional Mapping of Mafic-Ultramafic Complexes in Eastern Xinjiang (NW China): Implications for Cu-Ni Mineralization and Tectonic Dynamics

doi: 10.1007/s12583-012-0232-y

1.
Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
2.
Department of Geology, University of Ghana, Legon-Accra, Ghana

Funds:

the National Natural Science Foundation of China 41030424

the National Natural Science Foundation of China 41173011

the Knowledge Innovation Program of the Chinese Academy of Sciences KZCX2-YW-107

the China Postdoctoral Science Foundation to Benxun Su

More Information

Corresponding author: Benxun Su, subenxun@mail.iggcas.ac.cn; Kezhang Qin, kzq@mail.iggcas.ac.cn
Received Date: 08 Jun 2011
Accepted Date: 15 Sep 2011
Publish Date: 01 Feb 2012

Abstract

Abstract

Early Permian mafic-ultramafic complexes in eastern Xinjiang (新疆) are mainly distributed in the Beishan (北山) area, Mid-Tianshan (天山) massif and Jueluotage (觉罗塔格) belt. Systematic compositional mapping of olivines from these Early Permian mafic-ultramafic complexes demonstrates that an apparently spatial distribution and heterogeneous partial melting in the mantle source exists from the Beishan area, across the Mid-Tianshan massif, to the Jueluotage belt from the south to the north. This is probably consistent with the spatial evolutional differences and tectonic features of these three belts. The decreasing degree of partial melting, as revealed by decreasing Fo contents of olivines, from south to north and from east to west reflects the southward subduction of the Paleo-Asian Ocean and the south location of the indistinct mantle plume in the Permian. Simultaneously, NiO and Fo-mapping in olivine also indicates that sulfide segregation before olivine crystallization played an important role in Ni-Cu mineralization in the mafic-ultramafic complexes. Olivines with the compositional range of Fo (77–86) and NiO (less than 0.22 wt.%) are more favorable for Ni-Cu sulfide mineralization.
- mafic-ultramafic complex,
- olivine compositional mapping,
- Ni-Cu sulfide mineralization,
- Beishan,
- Mid-Tianshan massif,
- Jueluotage belt

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References(69)

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