Geochemical Characteristics and Petrogenesis of Permian Basaltic Rocks in Keping Area, Western Tarim Basin: A Record of Plume-Lithosphere Interaction

Junchuan Yu; Xuanxue Mo; Xuehui Yu; Guochen Dong; Qiang Fu; Fengcun Xing

doi:10.1007/s12583-012-0267-0

Volume 23 Issue 4

Aug 2012

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Journal of Earth Science > 2012 > 23(4): 442-454.

Junchuan Yu, Xuanxue Mo, Xuehui Yu, Guochen Dong, Qiang Fu, Fengcun Xing. Geochemical Characteristics and Petrogenesis of Permian Basaltic Rocks in Keping Area, Western Tarim Basin: A Record of Plume-Lithosphere Interaction. Journal of Earth Science, 2012, 23(4): 442-454. doi: 10.1007/s12583-012-0267-0

Citation:

Junchuan Yu, Xuanxue Mo, Xuehui Yu, Guochen Dong, Qiang Fu, Fengcun Xing. Geochemical Characteristics and Petrogenesis of Permian Basaltic Rocks in Keping Area, Western Tarim Basin: A Record of Plume-Lithosphere Interaction. Journal of Earth Science, 2012, 23(4): 442-454. doi: 10.1007/s12583-012-0267-0

Citation:

Junchuan Yu, Xuanxue Mo, Xuehui Yu, Guochen Dong, Qiang Fu, Fengcun Xing. Geochemical Characteristics and Petrogenesis of Permian Basaltic Rocks in Keping Area, Western Tarim Basin: A Record of Plume-Lithosphere Interaction. Journal of Earth Science, 2012, 23(4): 442-454. doi: 10.1007/s12583-012-0267-0

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Geochemical Characteristics and Petrogenesis of Permian Basaltic Rocks in Keping Area, Western Tarim Basin: A Record of Plume-Lithosphere Interaction

doi: 10.1007/s12583-012-0267-0

Junchuan Yu^{1, 2},
Xuanxue Mo^{1, 2
,
,},
Xuehui Yu^{1, 2},
Guochen Dong^{1, 2},
Qiang Fu³,
Fengcun Xing^{4, 5}

1.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China
4.
School of Earth Sciences and Mineral Resources, China University of Geosciences, Beijing 100083, China
2.
Beijing General Research Institute of Mining & Metallurgy, Beijing 100070, China
3.
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
5.
State Key Laboratory of Oil/Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China

Funds:

the National 973 Program of China 2011CB403102

the National 973 Program of China 2009CB421002

the SINOPEC Forward-Looking Project YPH08114

More Information

Corresponding author: Xuanxue Mo, moxx@cugb.edu.cn
Received Date: 08 Dec 2011
Accepted Date: 09 Mar 2012
Publish Date: 01 Aug 2012

Abstract

Abstract

The two basalt flows in Kupukuziman (库普库兹满) Formation of Keping (柯坪) area are the typical products of Permian magmatism. Based on systematic field investigations, we carried out geochemical studies on representative Keping basalts. The results show that the SiO₂ contents in basalts range from 44.69 wt.% to 51.68 wt.%, and the total alkalis range from 4.05 wt.% to 5.5 wt.%, belonging belonging to alkaline basalts. The Ti/Y=468.27–565.35 and TiO₂=(2.88–3.82) wt.% compared to those of the high-Ti basalts in Emeishan (峨眉山) large igneous province (LIP) (TiO₂=(3.58–5.21) wt.%, Ti/Y > 500, Xiao et al., 2004). The contents of MgO and compatible elements Cr (12.9–18.6 ppm), Ni (13.7–22.7 ppm), and Co (39.6–50.2 ppm) are low, which suggest that the samples have undergone varying grades of fractional crystallization. All the samples have uniform REE and other trace element characteristics, with enriched LREE and LILE relative to HREE and HFS, similar REE patterns without Eu anomaly. The basalts are also show slightly depleted of Ta and Nb. They have higher initial⁸⁷Sr/⁸⁶Sr ratios (0.707 211–0.708 300), lower ɛ_Nd(t) values (−2.47 to −4.14), and a narrow range of (²⁰⁸Pb/²⁰⁴Pb)_t=37.535 2–38.297 7, (²⁰⁷Pb/²⁰⁴Pb)_t=15.435 7–15.517 0, and (²⁰⁶Pb/²⁰⁴Pb)_t=17.206 5–17.874 7 ratios. The Ce/Y versus Zr/Nb diagram shows that the parent magmas were originated from low-degree partial melting of the garnet-lherzolite. The analysis results based on geochemical studies seem all point to the same conclusion that the Keping basalts have formed as a product of the interaction between the plume-derived melts and the lithosphere.
- Tarim basin,
- Permian,
- large igneous province,
- mantle plume,
- geochemical characteristics

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References(46)

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