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Protolith-related thermal controls on the decoupling of Sn and W in Sn-W metallogenic provinces; insights from the Nanling region, China

Yuan Shunda, Anthony E. Williams-Jones, Rolf L. Romer, Zhao Panlao and Mao Jingwen
Protolith-related thermal controls on the decoupling of Sn and W in Sn-W metallogenic provinces; insights from the Nanling region, China
Economic Geology and the Bulletin of the Society of Economic Geologists (August 2019) 114 (5): 1005-1012

Abstract

The Nanling region of South China hosts the largest W-Sn metallogenic province in the world, accounting for more than 54% of global tungsten resources as well as important resources of tin and rare metals. An important feature of this province, which is shared by a number of other W-Sn metallogenic provinces, is that W deposits occur separately from Sn and Sn-W deposits, with the latter concentrated in the western part of the region (especially along the deep, NE-trending Chenzhou-Linwu fault) and the W deposits to the east of them. All the deposits are associated with ilmenite series, peraluminous granites. However, the granites associated with the Sn and Sn-W deposits can be distinguished from the W granites by their higher bulk-rock ?Nd values and their higher zircon ?Hf values. Most importantly, the Sn and Sn-W granites are characterized by higher zircon saturation temperatures (800 + or - 20 degrees C) than the W granites (650-750 degrees C). The Sn and Sn-W granites also contain abundant mantle-derived mafic microgranular enclaves, whereas such enclaves are rare in the W granites. A model is proposed in which the protolith to the W granites released W to the melt as a result of the breakdown of muscovite. The temperature of melting, however, was too low for biotite to melt. In the west, particularly along the Chenzhou-Linwu fault (the location of the Sn and Sn-W deposits), higher temperatures enabled the breakdown of both muscovite and biotite and the consequent release of both Sn and W to form Sn and Sn-W granites. This model, which is based on differences in the protolith melting temperature and thus mobilization temperatures for Sn and W, is potentially applicable to any Sn-W metallogenic province in which the Sn and Sn-W deposits are spatially separated from the W deposits.


ISSN: 0361-0128
EISSN: 1554-0774
Coden: ECGLAL
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 114
Serial Issue: 5
Title: Protolith-related thermal controls on the decoupling of Sn and W in Sn-W metallogenic provinces; insights from the Nanling region, China
Affiliation: Chinese Academy of Geological Sciences, Institute of Mineral Resources, MLR Key Laboratory of Metallogeny and Mineral Assessment, Beijing, China
Pages: 1005-1012
Published: 201908
Text Language: English
Publisher: Economic Geology Publishing Company, Lancaster, PA, United States
References: 69
Accession Number: 2019-065664
Categories: Economic geology, geology of ore depositsIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, geol. sketch map
N24°00'00" - N27°00'00", E110°00'00" - E116°00'00"
Secondary Affiliation: McGill University, CAN, CanadaDeutsches GeoForschungsZentrum Potsdam, DEU, Germany
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, Copyright, Society of Economic Geologists. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201934
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