西准噶尔晚古生代中基性岩墙群岩石学成因及地质意义

贺新星; 肖龙; 王国灿; 高睿; 杨钢; 鄢圣武

doi:10.3799/dqkx.2015.064

Volume 40 Issue 5

May 2015

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Article Navigation > Earth Science > 2015 > 40(5): 777-796

He Xinxing, Xiao Long, Wang Guocan, Gao Rui, Yang Gang, Yan Shengwu, 2015. Petrogenesis and Geological Implications of Late Paleozoic Intermediate-Basic Dyke Swarms in Western Junggar. Earth Science, 40(5): 777-796. doi: 10.3799/dqkx.2015.064

Citation:

He Xinxing, Xiao Long, Wang Guocan, Gao Rui, Yang Gang, Yan Shengwu, 2015. Petrogenesis and Geological Implications of Late Paleozoic Intermediate-Basic Dyke Swarms in Western Junggar. Earth Science, 40(5): 777-796. doi: 10.3799/dqkx.2015.064

Citation:

He Xinxing, Xiao Long, Wang Guocan, Gao Rui, Yang Gang, Yan Shengwu, 2015. Petrogenesis and Geological Implications of Late Paleozoic Intermediate-Basic Dyke Swarms in Western Junggar. Earth Science, 40(5): 777-796. doi: 10.3799/dqkx.2015.064

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Petrogenesis and Geological Implications of Late Paleozoic Intermediate-Basic Dyke Swarms in Western Junggar

doi: 10.3799/dqkx.2015.064

He Xinxing^{1, 2
,},
Xiao Long^{2
,
,},
Wang Guocan^{2, 3},
Gao Rui^{2, 4},
Yang Gang^{2, 5},
Yan Shengwu^{2, 6}

1.
Geological Survey of Jiangsu Province, Nanjing 210018, China
2.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
3.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
4.
College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China
5.
Key Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Administration, Wuhan 430071, China
6.
Geological Survey of Sichuan Province, Chengdu 610081, China

Received Date: 2014-10-15
Publish Date: 2015-05-15

Abstract

Abstract

Understanding of the formation and occurrence of intermediate-basic dyke swarms can facilitate future studies on the magmatic evolution and tectonic settings. The Xiaerpu and Xiaoxihu intermediate-basic dyke swarms in West Junggar are principally composed of dioritic porphyrite, with minor diabase. LA-ICP-MS zircon U-Pb dating results indicate that the Xiaerpu dyke swarm is emplaced with age of 308.6±5.5 Ma. It is concluded that these dykes are the products of magmatism in Late Carboniferous based on the geological relationship between the dykes and host granitic rocks, and previous chronological studies. The dykes are characterized by high Mg^#(> 40), high MgO(> 3%) and Al₂O₃(> 16%), belonging to calc-alkaline rocks and metaluminous rocks (with A/CNK approximately at 0.9 and A/NK > 2). The rocks have lower total REE (most are concentrated in 40×10^-6-60 ×10^-6), with enriched LREE and slightly positive Eu anomalies ((La/Yb)_N=3.03-11.32, δEu=1.00-1.20). All samples are highly depleted in (Nb, Ta, Ti and Th), and enriched in (Sr, Ba, K and Rb). Meanwhile, the high contents of Sr (> 500×10^-6), low contents of Y and Yb, high values of Sr/Y ratios (36.98-95.74), indicate the rocks (except sample XEP01, XEP02 and XXH06) are analogous to Mg-enriched adakitic rocks. Dykes have depleted Sr-Nd isotopic composition ((⁸⁷Sr/⁸⁶Sr)_i=0.703 58-0.703 80, ε_Nd(t)=5.76-6.34). Geochemical and isotopic compositions indicate that depleted-mantle components and materials related to subduction have prominent significance in the origin source of these dykes. Combined with the district geological evolution history and previous studies, we propose that West Junggar was under a post-collisional regime in Late Carboniferous. Due to the melting of remnant subducted oceanic slab, the slab melts interacted with the mantle materials to varying extent during ascent, and then accompanied fractional crystallization of clinopyroxene that generated the Mg-enriched adakitic rocks in Xiaerpu and Xiaoxihu intermediate-basic dyke swarms; and fractional crystallization of clinopyroxene of depleted-mantle materials metasomatised by slab melts can account for the formation of the diabase in Xiaerpu dyke swarm and the amphibolic diorite in Xiaoxihu dyke swarm. The emplacement of large-scale intermediate-basic dyke swarms further show that West Junggar was under a post-collisional extensional environment in Late Carboniferous.
- western Junggar,
- intermediate-basic dyke swarm,
- remnant subducted oceanic slab,
- depleted-mantle,
- petrology,
- geochemistry

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References(119)

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Petrogenesis and Geological Implications of Late Paleozoic Intermediate-Basic Dyke Swarms in Western Junggar

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