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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

Xiao, X, Zhou, T, White, NC, Zhang, LJ, Fan, Yu and Chen, X 2020 , '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 , doi: 10.1007/s00126-020-00962-0.

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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 ofbothmagmatic and hydrothermal titanites are distinguished, based on their textural and chemical characteristics. Types 1 and 2 titanitesare magmatic in origin whereas types 3, 4, and 5 are hydrothermal. Magmatic titanites are wedge-shaped and display concentric andsector zoning,whereas hydrothermal titanites show a wide range of textures that vary with different alteration stages. REE, Sn,Mo, andCu are enriched inmagmatic titanites (types 1 and 2). In contrast, vanadium and HFSE are enriched in hydrothermal titanites, especiallyin type 4 titanite from the propylitic alteration zone.Magmatic titanite (type 1) coexists with magnetite and K-feldspar and crystallizedin oxidized and H2O-rich magma at 730–760 °C. Type 2 titanite contains ilmenite inclusions reflecting changes in the fO2 of themagmachamber, possibly caused by input ofmafic magma. Themobility and enrichment of HFSE and association with fluorapatite reflect theF-rich composition of the magmatic-hydrothermal fluid at Dongguashan. The relationship between titanite textures and chemistryindicates that titanite can serve as a recorder of magmatic-hydrothermal processes in porphyry copper systems. U-Pb dating of type 4titanite 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 Type: Article
Authors/Creators:Xiao, X and Zhou, T and White, NC and Zhang, LJ and Fan, Yu and Chen, X
Keywords: Dongguashan porphyry-skarn Cu-Au deposit, magmatic and hydrothermal titanites, u-Pb geochronology, trace elements, magmatismand ore-forming processes
Journal or Publication Title: Mineralium Deposita: International Journal of Geology, Mineralogy, and Geochemistry of Mineral Deposits
Publisher: Springer
ISSN: 0026-4598
DOI / ID Number: 10.1007/s00126-020-00962-0
Copyright Information:

Copyright 2020 Springer-Verlag GmbH Germany, part of Springer Nature

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