Zircon U–Pb geochronology and geochemistry of rhyolitic tuff, granite porphyry and syenogranite in the Lengshuikeng ore district, SE China: implications for a continental arc to intra-arc rift setting

Wang, Changming, Zhang, Da, Wu, Ganguo, Xu, Yigan, Carranza, Emmanuel John M., Zhang, Yaoyao, Li, Huaikun, and Geng, Jianzhen (2013) Zircon U–Pb geochronology and geochemistry of rhyolitic tuff, granite porphyry and syenogranite in the Lengshuikeng ore district, SE China: implications for a continental arc to intra-arc rift setting. Journal of Earth System Science, 122 (3). pp. 809-830.

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Abstract

SE China is well known for its Mesozoic large-scale granitoid plutons and associated ore deposits. Here, zircon U–Pb geochronological and geochemical data have been used to better constrain the petrogenesis of the igneous rocks associated with porphyry Ag–Pb–Zn deposits in the Lengshuikeng ore district, SE China. The Lengshuikeng rhyolitic tuff, granite porphyry and syenogranite yielded zircon U–Pb ages of 161, 155 and 138 Ma, respectively. The Lengshuikeng granite porphyries belong to calc-alkaline series and show fractionated I-type affinities. The rhyolitic tuffs show almost similar characteristics as the granite porphyries. The Lengshuikeng syenogranites are all alkali-rich and show A-type affinities. The syenogranites have high contents of high field strength elements such as Nb, Ta, Zr, Hf; with Zr + Nb + Ce + Y contents of >350 ppm. Chondrite-normalized REE patterns show relative enrichment of LREEs and strong negative Eu anomalies. The Lengshuikeng granite porphyries, syenogranites and tuffs were probably derived from partial melting of underlying Proterozoic metasedimentary rocks with minor addition of mantle-derived magmas, accompanied by fractional crystallization. Detailed petrologic and geochemical data for the Jurassic igneous rocks from the Lengshuikeng ore district imply that during the Late Jurassic, SE China on the southeast of the Shi-Hang zone was a continental arc associated with the subduction of the Palaeo-Pacific plate and that since the beginning of the Early Cretaceous an intra-arc rift has been formed along the Shi-Hang zone.

Item ID: 27945
Item Type: Article (Research - C1)
ISSN: 0973-774X
Keywords: A-type, I-type, continental arc, rifting, Lengshuikeng, southeast China
Funders: China Bureau of Geological Survey, National Basic Research Program of China, Fundamental Research Funds for the Central Universities
Projects and Grants: 1212011085472, 1212010533105, 1212010981048, 2009CB421008, 2010ZY02
Date Deposited: 04 Jul 2013 23:33
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040303 Geochronology @ 50%
04 EARTH SCIENCES > 0402 Geochemistry > 040202 Inorganic Geochemistry @ 50%
SEO Codes: 84 MINERAL RESOURCES (excl. Energy Resources) > 8401 Mineral Exploration > 840199 Mineral Exploration not elsewhere classified @ 100%
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