东昆仑南缘布青山构造混杂带得力斯坦南MOR型玄武岩地质、地球化学特征及岩石成因

李瑞保; 裴先治; 李佐臣; 陈有炘; 刘成军; 裴磊; 徐通; 刘战庆; 魏博

doi:10.3799/dqkx.2015.096

Volume 40 Issue 7

Jul. 2015

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Li Ruibao, Pei Xianzhi, Li Zuochen, Chen Youxin, Liu Chengjun, Pei Lei, Xu Tong, Liu Zhanqing, Wei Bo, 2015. Geological and Geochemical Features of Delisitannan Basalts and Their Petrogenesis in Buqingshan Tectonic Mélange Belt, Southern Margin of East Kunlun Orogen. Earth Science, 40(7): 1148-1162. doi: 10.3799/dqkx.2015.096

Citation:

Li Ruibao, Pei Xianzhi, Li Zuochen, Chen Youxin, Liu Chengjun, Pei Lei, Xu Tong, Liu Zhanqing, Wei Bo, 2015. Geological and Geochemical Features of Delisitannan Basalts and Their Petrogenesis in Buqingshan Tectonic Mélange Belt, Southern Margin of East Kunlun Orogen. Earth Science, 40(7): 1148-1162. doi: 10.3799/dqkx.2015.096

Citation:

Li Ruibao, Pei Xianzhi, Li Zuochen, Chen Youxin, Liu Chengjun, Pei Lei, Xu Tong, Liu Zhanqing, Wei Bo, 2015. Geological and Geochemical Features of Delisitannan Basalts and Their Petrogenesis in Buqingshan Tectonic Mélange Belt, Southern Margin of East Kunlun Orogen. Earth Science, 40(7): 1148-1162. doi: 10.3799/dqkx.2015.096

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Geological and Geochemical Features of Delisitannan Basalts and Their Petrogenesis in Buqingshan Tectonic Mélange Belt, Southern Margin of East Kunlun Orogen

doi: 10.3799/dqkx.2015.096

Li Ruibao^{1, 2
,},
Pei Xianzhi^{1, 2
,
,},
Li Zuochen^{1, 2},
Chen Youxin²,
Liu Chengjun²,
Pei Lei³,
Xu Tong²,
Liu Zhanqing⁴,
Wei Bo²

1.
Key Laboratory of Western Mineral Resources and Geological Engineering, Ministry of Education, Chang'an University, Xi'an 710054, China
2.
Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Chang'an University, Xi'an 710054, China
3.
College of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
4.
School of Earth Sciences, Guilin University of Technology, Guilin 541004, China

Received Date: 2014-12-05
Publish Date: 2015-07-15

Abstract

Abstract

OIB-type basalts outcropped in the Buqingshan tectonic mélange belt, southern margin of East Kunlun, are closely related to mantle plume petrogeneticly. The MOR-type basalts are also another types of seamount basalts developed in the Paleotethys ocean. The Delisitannan basalts in Buqinshan area are located in the southern margin of the East Kunlun region. Field investigations show that the basalts are composed of pillow basalts, fumarolic-amygdaloidal basalts, breccia basalts and massive basalts, which are covered by lamellar fuchsia silicon mudstone. Geochemical data show that the basalts are subdivided into abyssal tholeiite and oceanic ridge tholeiite series. The contents of REE range from 34.51×10^-6-61.60×10^-6, LREE/HREE=0.89-1.37, (La/Yb)_N=0.30-0.56. The chondrite-normalized REE pattern shows left-dipped incline and weak negative Eu abnormity (δEu=0.90-1.18), which is identical to NMORB REE distribution pattern. The Delisitannan basalts are aschistic in HSFE (Nb, Ta, Zr, Hf), and Zr/Nb ratios range from 24.59-57.69, Nb/La ratios range from 0.45-0.94, Hf/Ta ratio ranges from 18.29-31.94, which are all similar to those of NMORB basalts, and are obviously different from EMORB and OIB basalts. All of the trace element characteristics indicate that the basalts formed in an NMORB tectonic environment. The petrogenesis study shows that the rocks originated from depleted mantle, and are the product of 10% partial melting of mantle lherzolite roughly.
- East Kunlun,
- basalt,
- Buqingshan,
- paleotethyan ocean,
- geochemistry,
- petrology

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References(93)

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Geological and Geochemical Features of Delisitannan Basalts and Their Petrogenesis in Buqingshan Tectonic Mélange Belt, Southern Margin of East Kunlun Orogen

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