新疆塔什库尔干塔阿西一带火山岩成因及地质意义

高晓峰; 校培喜; 康磊; 朱海平; 过磊; 奚仁刚; 董增产

doi:10.3799/dqkx.2013.116

Volume 38 Issue 6

Jun. 2013

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Article Navigation > Earth Science > 2013 > 38(6): 1169-1182

GAO Xiao-feng, XIAO Pei-xi, KANG Lei, ZHU Hai-ping, GUO Lei, XI Ren-gang, DONG Zeng-chan, 2013. Origin of the Volcanic Rocks from the Ta'axi Region, Taxkorgan Xinjiang and Its Geological Significance. Earth Science, 38(6): 1169-1182. doi: 10.3799/dqkx.2013.116

Citation:

GAO Xiao-feng, XIAO Pei-xi, KANG Lei, ZHU Hai-ping, GUO Lei, XI Ren-gang, DONG Zeng-chan, 2013. Origin of the Volcanic Rocks from the Ta'axi Region, Taxkorgan Xinjiang and Its Geological Significance. Earth Science, 38(6): 1169-1182. doi: 10.3799/dqkx.2013.116

Citation:

GAO Xiao-feng, XIAO Pei-xi, KANG Lei, ZHU Hai-ping, GUO Lei, XI Ren-gang, DONG Zeng-chan, 2013. Origin of the Volcanic Rocks from the Ta'axi Region, Taxkorgan Xinjiang and Its Geological Significance. Earth Science, 38(6): 1169-1182. doi: 10.3799/dqkx.2013.116

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Origin of the Volcanic Rocks from the Ta'axi Region, Taxkorgan Xinjiang and Its Geological Significance

doi: 10.3799/dqkx.2013.116

GAO Xiao-feng^{1, 2
,},
XIAO Pei-xi^{1, 2},
KANG Lei^{1, 2},
ZHU Hai-ping³,
GUO Lei^{1, 2},
XI Ren-gang^{1, 2},
DONG Zeng-chan^{1, 2}

1.
Research Center for Orogenic Geology, Xi'an Center of Geological Survey, China Geological Survey, Xi'an 710054, China
2.
Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Xi'an Center of Geological Survey, China Geological Survey, Xi'an 710054, China
3.
Shaanxi Geological Survey, Xi'an 710065, China

Received Date: 2012-11-29
Publish Date: 2013-06-01

Abstract

Abstract

This paper presents petrological and geochemical features and zircon U-Pb age of a suite of bimodal volcanic rocks in the Bulunkuole Group from the Taishuihai Massif, NW China. The zircon U-Pb dating results yield a mean ²³⁸U/²⁰⁶Pb age of 521.3±3.3 Ma, representing the extrusion time of the dacites in the Middle Cambrian, which indicates that the previously defined Paleoproterozoic Bulunkuole Group also includes early Paleozoic volcanic rocks. The basalts and dacites belong to low-K affinities. The basalts show enrichment in Rb, Ba, K and LREE, and depletion in Nb-Ta and Th, suggesting that they were derived from a previously metasomatized depleted mantle. The dacites also show more enrichment in LILE and Th, and larger depletion in Nb-Ta, Sr and Ti in comparison with the basalts. Different REE patterns and trace element features between the two rock types, and the absence of differentiation trend from the basalts to dacites, argue against the origin for the dacites as the differentiates of the basalts. Combining the dacites geochemical features and the experimental data suggest that they are melts of lower crustal mafic protoliths heated by contemporaneous underplating basaltic magmas at relatively low pressure conditions. The occurrence of the bimodal volcanic rocks reflects that the region experienced an extensional tectonic-magmatic event during early Paleozoic. The new data suggests that the previously defined "Paleoproterozoic Bulunkuole Group" includes at least three components: (1) the Paleoproterozoic khondalite series; (2) the Indo-Sinian high-pressure metamorphic complexes and (3) the early Paleozoic volcano-sedimentary associations.
- petrogenesis,
- volcanic rocks,
- bulunkuole Group,
- taxkorgan region,
- zircon,
- geochemistry

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References(71)

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Origin of the Volcanic Rocks from the Ta'axi Region, Taxkorgan Xinjiang and Its Geological Significance

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