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Geochronology of the diorite porphyrites in Ning-Wu basin and their metallogenic significances

Citation

Fan, Y and Zhou, TF and Yuan, F and Zhang, LJ and Qian, B and Ma, L and Cooke, DR, Geochronology of the diorite porphyrites in Ning-Wu basin and their metallogenic significances, Yanshi Xuebao (Acta Petrologica Sinica), 26, (9) pp. 2715-2728. ISSN 1000-0569 (2010) [Refereed Article]

Abstract

Ning-Wu basin is the important parts of the Middle-Lower Yangtze River Valley metallogenic belt, where there are widespread porphyry-like type ( magnetite-apatite type) iron deposits. However, the researches on precise ore-forming and magmatic activity epoch and tectonic setting are very weak. Based on detailed field geological work, we carried out systematic geochronological study of diorite porphyrite plutons related to porphyry-like type iron deposits in the basin. LA-ICP-MS zircon U-Pb dating for seven diorite porphyrite plutons such as Washan, Taocun, Heshangqiao, Dongshan, Baixiangshan, Hemushan and Gushan intrusions, has been carried out. LA-ICP-MS zircon U-Pb dating yield the ages of 130.22.O Ma, 130.71.8 Ma, 131.11.5 Ma, 131.13.1 Ma, 130.01.4 Ma, 131.11.9 Ma and 129.21.7 Ma for intrusions respectively. The dating result indicates that different diorite porphyrite plutons in Ning-Wu volcanic basin are all formed in the early stage of Early Cretaceous about 130Ma, which can nearly represent the metallogenetic epoch of the porphyry-like type iron deposits. There are three periods (145-136 Ma, 135-127 Ma, 126-123 Ma) of ore-forming and magmatic activity in the Middle-Lower Yangtze River Valley metallogenic belt. The diorite porphyrite plutons in Ning-Wu basin were the products of the second period magmatic activity and obviously later than the high-k calc-alkaline intrusions related to skarn-porphyry Cu-Au deposits in uplift areas in the Middle-Lower Yangtze River Valley metallogenic belt. The diorite porphyrite plutons in Ning-Wu volcanic basin were thought to be formed under regional lithospheric and thinning environment.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Geology
Research Field:Geochronology
Objective Division:Mineral Resources (excl. Energy Resources)
Objective Group:Mineral Exploration
Objective Field:Copper Ore Exploration
Author:Zhang, LJ (Mr Lejun Zhang)
Author:Cooke, DR (Professor David Cooke)
ID Code:67979
Year Published:2010
Web of Science® Times Cited:25
Deposited By:Centre for Ore Deposit Research - CODES CoE
Deposited On:2011-03-08
Last Modified:2014-10-15
Downloads:0

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