Geochronology, Geochemistry and Formation Mechanism of Malashan Granite in Tethyan Himalaya

WANG Xiaoxian; ZHANG Jinjiang; YANG Xiongying

Northwestern Geology > 2015 > 48(4): 70-87.

WANG Xiaoxian, ZHANG Jinjiang, YANG Xiongying. Geochronology, Geochemistry and Formation Mechanism of Malashan Granite in Tethyan Himalaya[J]. Northwestern Geology, 2015, 48(4): 70-87.

Citation:

WANG Xiaoxian, ZHANG Jinjiang, YANG Xiongying. Geochronology, Geochemistry and Formation Mechanism of Malashan Granite in Tethyan Himalaya[J]. Northwestern Geology, 2015, 48(4): 70-87.

Citation:

WANG Xiaoxian, ZHANG Jinjiang, YANG Xiongying. Geochronology, Geochemistry and Formation Mechanism of Malashan Granite in Tethyan Himalaya[J]. Northwestern Geology, 2015, 48(4): 70-87.

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Geochronology, Geochemistry and Formation Mechanism of Malashan Granite in Tethyan Himalaya

1.
Key Laboratory of Crustal Dynamics, Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China;Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China
2.
Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China

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Received Date: February 14, 2015
Revised Date: July 06, 2015
Published Date: December 04, 2015

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Abstract

Abstract

The Malashan granite was exposed in the west of the Tethyan Himalayan sedimentary sequence(THS).It is characterized by gneissic texture and the assemblage of quartz, K-feldspar, muscovite and biotite.LA-MC-ICP-MS zircon U-Pb dating results indicated that the granite recorded two episodes of anatexis at(28.0±0.5) Ma and(18.4±0.3) Ma, respectively.The age of(18.4±0.3) Ma represents the final crystallized time of Malashan granite.Geochemical data show that these samples are characterized by high SiO₂(72.36%-72.51%), Al₂O₃(15.22%-15.37%), CaO(1.64%-1.66%) and high value of K₂O/Na₂O(0.97-1.05) and A/CNK(1.15-1.20), and the enrichment in Rb, Th, U and K, the depletion in Ba, Nb, Sr and Zr, weak negative Eu anomalies(δEu=0.80-0.89), and strong fractionation between LREE and HREE((La/Yb)_N=7.09-19.68).These features suggest that they are high potassium calc-alkaline and peraluminous granites.The relatively low Rb/Sr ratios(0.90-1.10)and high CaO/Na₂O ratios(0.44-0.46)imply that the magma source was probably psammitolite.The(⁸⁷Sr/⁸⁶Sr)_I(0.742522-0.744097) and ε_Nd(t)(-14.5--13.7) can compare well with those of the metasedimentary rocks in the Greater Himalaya Crystalline complex(GHC), so these granite wasgenerated from partial melting of the GHC metasedimentary rocks.The features of relatively low(⁸⁷Sr/⁸⁶Sr)_i and high Sr content,and the constant Rb/Sr ratios relative to large variations in Ba concentrations approve that, the Malashangranite wasderived from fluxed melting of the GHC metasedimentary rocks,possibly associated tightly with the E-W extension along the North-South trend rift system(NSTR).
- Malashan granite,
- geochronology,
- geochemistry,
- formation mechanism,
- Tethyan Himalaya

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Geochronology, Geochemistry and Formation Mechanism of Malashan Granite in Tethyan Himalaya

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