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Compositional Variation and Mineral Chemistry of Jinshajiang and Lancangjiang Serpentinites, Yunnan Province, SW China

Compositional Variation and Mineral Chemistry of Jinshajiang and Lancangjiang Serpentinites,... Dec. 2015 MASOUD Ahmed Elsaid, YANG Jingsui and LIU Fei, 2015. Compositional Variation and Mineral Chemistry of Jinshajiang and Lancangjiang Serpentinites, Yunnan Province, SW China. Acta Geologica Sinica (English Edition), 89(supp. 2): 60. Compositional Variation and Mineral Chemistry of Jinshajiang and Lancangjiang Serpentinites, Yunnan Province, SW China MASOUD Ahmed Elsaid1, 2, 3, YANG Jingsui1, 2* and LIU Fei2 1 Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China 2 State Key Laboratory of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China 3 Geology Department, Faculty of Science, Tanta University, Tanta, Egypt We present the whole-rock and the mineral chemical data for upper mantle peridotites from the San-Jiang region in Yunnan Province, SW China. These peridotites are part of a Paleo-Tethyan ophiolite belt occurring along the Jinshajiang and Lancangjiang suture zones. All samples of Jinshajiang and Lancangjiang ultramafic rocks are completely serpentinized. The Jinshajiang serpentinites are characterized by no relict of Olivine and Pyroxene, and the Cr number of spinels is 0.32-0.49. The Lancangjiang serpentinites were collected from two different locations; the northern location which has some relict of Opx (Al2O3 is 0.13-2.20 wt%, TiO2 is 0.004-0.057 wt% and Mg number is 0.895-0.933) and the Cr number of spinel is 0.26-0.55; the southern location, which has some relict of Olivine (Fo= 90-92.5 and NiO=0.12-0.26 wt%), and spinel Cr# ranging from 0.41 to 0.57. The whole rock and the mineral chemistry data imply that the Jinshajiang and Lancangjiang serpentinites representing abyssal perdiotites that residues after ~15% -20% partial melting for Jinshajiang and Lancangjiang serpentinites (south location), and ~11%19% partial melting for Lancangjiang serpentinites (north location). In addition, the Lancangjiang serpentinites imply that MORB melt-peridotite interaction process played a significant role during their evolution. These processes are evidenced by an increase in Cr# and TiO2 of the spinels from it, whereas the spinels of Jinshajiang serpentinites display increase in Cr# with decrease TiO2, which might representing MOR-type perditotites for both of Lancangjiang and Jinshajiang serpentinites. * Corresponding author. E-mail: yangjsui@163.com http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acta Geologica Sinica (English Edition) Wiley

Compositional Variation and Mineral Chemistry of Jinshajiang and Lancangjiang Serpentinites, Yunnan Province, SW China

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Publisher
Wiley
Copyright
© 2015 Geological Society of China
ISSN
1000-9515
eISSN
1755-6724
DOI
10.1111/1755-6724.12308_38
Publisher site
See Article on Publisher Site

Abstract

Dec. 2015 MASOUD Ahmed Elsaid, YANG Jingsui and LIU Fei, 2015. Compositional Variation and Mineral Chemistry of Jinshajiang and Lancangjiang Serpentinites, Yunnan Province, SW China. Acta Geologica Sinica (English Edition), 89(supp. 2): 60. Compositional Variation and Mineral Chemistry of Jinshajiang and Lancangjiang Serpentinites, Yunnan Province, SW China MASOUD Ahmed Elsaid1, 2, 3, YANG Jingsui1, 2* and LIU Fei2 1 Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China 2 State Key Laboratory of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China 3 Geology Department, Faculty of Science, Tanta University, Tanta, Egypt We present the whole-rock and the mineral chemical data for upper mantle peridotites from the San-Jiang region in Yunnan Province, SW China. These peridotites are part of a Paleo-Tethyan ophiolite belt occurring along the Jinshajiang and Lancangjiang suture zones. All samples of Jinshajiang and Lancangjiang ultramafic rocks are completely serpentinized. The Jinshajiang serpentinites are characterized by no relict of Olivine and Pyroxene, and the Cr number of spinels is 0.32-0.49. The Lancangjiang serpentinites were collected from two different locations; the northern location which has some relict of Opx (Al2O3 is 0.13-2.20 wt%, TiO2 is 0.004-0.057 wt% and Mg number is 0.895-0.933) and the Cr number of spinel is 0.26-0.55; the southern location, which has some relict of Olivine (Fo= 90-92.5 and NiO=0.12-0.26 wt%), and spinel Cr# ranging from 0.41 to 0.57. The whole rock and the mineral chemistry data imply that the Jinshajiang and Lancangjiang serpentinites representing abyssal perdiotites that residues after ~15% -20% partial melting for Jinshajiang and Lancangjiang serpentinites (south location), and ~11%19% partial melting for Lancangjiang serpentinites (north location). In addition, the Lancangjiang serpentinites imply that MORB melt-peridotite interaction process played a significant role during their evolution. These processes are evidenced by an increase in Cr# and TiO2 of the spinels from it, whereas the spinels of Jinshajiang serpentinites display increase in Cr# with decrease TiO2, which might representing MOR-type perditotites for both of Lancangjiang and Jinshajiang serpentinites. * Corresponding author. E-mail: yangjsui@163.com

Journal

Acta Geologica Sinica (English Edition)Wiley

Published: Dec 1, 2015

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