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Multiple generations of titanites and their geochemical characteristics record the magmatic-hydrothermal processes and timing of the Dongguashan porphyry-skarn Cu-Au system, Tongling district, Eastern China

Citation

Xiao, X and Zhou, T and White, NC and Zhang, LJ and Fan, Yu and Chen, X, Multiple generations of titanites and their geochemical characteristics record the magmatic-hydrothermal processes and timing of the Dongguashan porphyry-skarn Cu-Au system, Tongling district, Eastern China, Mineralium Deposita: International Journal of Geology, Mineralogy, and Geochemistry of Mineral Deposits ISSN 0026-4598 (2020) [Refereed Article]


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DOI: doi:10.1007/s00126-020-00962-0

Abstract

Dongguashan is one of the largest porphyry-skarn Cu-Au deposits in eastern China and titanite is found in the ore system. Five types of bothmagmatic and hydrothermal titanites are distinguished, based on their textural and chemical characteristics. Types 1 and 2 titanites are magmatic in origin whereas types 3, 4, and 5 are hydrothermal. Magmatic titanites are wedge-shaped and display concentric and sector zoning,whereas hydrothermal titanites show a wide range of textures that vary with different alteration stages. REE, Sn,Mo, and Cu are enriched inmagmatic titanites (types 1 and 2). In contrast, vanadium and HFSE are enriched in hydrothermal titanites, especially in type 4 titanite from the propylitic alteration zone.Magmatic titanite (type 1) coexists with magnetite and K-feldspar and crystallized in oxidized and H2O-rich magma at 730760 C. Type 2 titanite contains ilmenite inclusions reflecting changes in the fO2 of themagma chamber, possibly caused by input ofmafic magma. Themobility and enrichment of HFSE and association with fluorapatite reflect the F-rich composition of the magmatic-hydrothermal fluid at Dongguashan. The relationship between titanite textures and chemistry indicates that titanite can serve as a recorder of magmatic-hydrothermal processes in porphyry copper systems. U-Pb dating of type 4 titanite from the propylitic alteration zone and type 5 titanite from skarn yielded ages of 139.0 2.6 Ma and 137.0 2.0 Ma, respectively, indicating that it formed synchronously with the associated quartz monzodiorite.

Item Details

Item Type:Refereed Article
Keywords:Dongguashan porphyry-skarn Cu-Au deposit, magmatic and hydrothermal titanites, u-Pb geochronology, trace elements, magmatismand ore-forming processes
Research Division:Earth Sciences
Research Group:Geology
Research Field:Ore Deposit Petrology
Objective Division:Mineral Resources (excl. Energy Resources)
Objective Group:Mineral Exploration
Objective Field:Copper Ore Exploration
UTAS Author:Zhang, LJ (Dr Lejun Zhang)
ID Code:138246
Year Published:2020
Deposited By:CODES ARC
Deposited On:2020-03-30
Last Modified:2020-03-30
Downloads:0

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