Geochronology, geochemistry and petrogenesis of diabase dyke swarms in East Tianshan, Xinjiang, NW China

Zhang, Zuoheng, Chai, Fengmei, Wang, Tuanhua, Cheng, Yanbo, Xu, Lingang, and Yuan, Shunda (2012) Geochronology, geochemistry and petrogenesis of diabase dyke swarms in East Tianshan, Xinjiang, NW China. Acta Geologica Sinica, 86 (6). pp. 1500-1514.

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Abstract

Diabase dyke swarms are widespread in the East Tianshan and Beishan regions. LA-ICP-MS zircon U-Pb ages of these diabase vary from 305 Ma to 278 Ma, showing that these dykes were formed during Late Carboniferous-Early Permian magmatism. All diabase samples are subalkali calc-alkali, characterized by slight LREE and LILEs enrichment, and weak negative Ti, Nb and Ta anomalies. The diabase samples have positive ε(Nd)(t) values (>+3), high Sr isotopic compositions (initial 87Sr/86Sr values=0.7030–0.7097), and large variation of Pb isotopic compositions, indicating they were derived from a deplete mantle source. Regional geology and geochemistry evidences indicate that these diabase dyke swarms were generated in a lithosphere extensional setting and had the same magma sources. Initial magmas may be a mixture of depleted asthenosphere mantle and enriched lithospheric mantle during rapid magma ascending.

Item ID: 40110
Item Type: Article (Research - C1)
ISSN: 1755-6724
Keywords: diabase; geochemistry; LA-ICP-MS zircon U-Pb dating; East Tianshan
Funders: National Natural Science Foundation of China (NNSFC), Central Public-interest Scientific Institution Basal Research Fund (BRF)
Projects and Grants: NNSFC No. 40973028, BRF K1107
Date Deposited: 20 Aug 2015 03:28
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040307 Ore Deposit Petrology @ 100%
SEO Codes: 84 MINERAL RESOURCES (excl. Energy Resources) > 8401 Mineral Exploration > 840199 Mineral Exploration not elsewhere classified @ 100%
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