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Geology and geochronology of magnetite–apatite deposits in the Ning-Wu volcanic basin, eastern China
Zhou, T and Fan, Y and Yuan, F and Zhang, L and Qian, B and Ma, L and Yang, X, Geology and geochronology of magnetite-apatite deposits in the Ning-Wu volcanic basin, eastern China, Journal of Asian Earth Sciences, 66 pp. 90-107. ISSN 1367-9120 (2013) [Refereed Article]
Copyright 2013 Published by Elsevier Ltd.
The Ning-Wu volcanic basin is an important part of the Middle-Lower Yangtze River Valley metallogenic belt in eastern China, where magnetite–apatite deposits are common. These magnetite–apatite deposits can be classified into two types. The first type includes the Washan, Taocun, Heshangqiao and Dongshan deposits, which are hosted in diorite porphyry and adjacent volcanic rocks. The second type includes Gushan, Baixiangshan and Hemushan deposits, developed at the contact between gabbro–diorite and sedimentary rocks. We used 40Ar–39Ar dating on phlogopite and U–Pb LA-ICP MS dating of zircon in ore-related diorite porphyry and gabbro–diorite to determine the timing of iron mineralization in the basin. The ages of the magnetite–apatite deposits such as Washan, Taocun, Heshangqiao Gushan Baixiangshan Hemushan deposits are from 130 Ma to 131 Ma. Thus the magnetite–apatite deposits in the Ning-Wu volcanic basin all formed at about 130 Ma, later than the skarn and porphyry Cu–Au deposits in the adjacent fault-uplift areas such as Edongnan, Jiu-Rui, Anqing-Guichi and Tongling clusters that are between 146 Ma and 135 Ma. Based on available petrological and geochemical data, the magnetite–apatite deposits in the Ning-Wu volcanic basin are interpreted to have formed under regional lithospheric extension and thinning, and ore-forming elements were derived from basaltic melts sourced from enriched lithospheric mantle and the crust.
|Item Type:||Refereed Article|
|Keywords:||metallogenic epoch, magnetite–apatite deposits, the Middle-Lower Yangtze River Valley metallogenic belt, tectonic setting|
|Research Division:||Earth Sciences|
|Research Field:||Stratigraphy (incl. biostratigraphy, sequence stratigraphy and basin analysis)|
|Objective Division:||Mineral Resources (Excl. Energy Resources)|
|Objective Group:||Mineral exploration|
|Objective Field:||Aluminium ore exploration|
|UTAS Author:||Zhang, L (Dr Lejun Zhang)|
|Web of Science® Times Cited:||31|
|Deposited By:||Centre for Ore Deposit Research - CODES CoE|
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