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New Insights into the Indosinian Mineralization in the Nanling Range: Evidence from the Gaoling Tungsten Deposit
Author(s) -
ZHANG Di,
ZHANG Wenlan,
WANG Rucheng,
HUA Renmin,
CHEN Wendi
Publication year - 2014
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.12378_34
Subject(s) - mineralization (soil science) , zhàng , library science , geochemistry , engineering , geology , china , archaeology , geography , computer science , soil science , soil water
associated with the Jura-Cretaceous granitic intrusions. However, recent studies have identified the Triassic tungsten mineralization in the Western Nanling Range (Li et al, 2012; Wu et al, 2012; Yang et al, 2013). The Miao’ershan–Yuechengling intrusive complex is the largest granitic batholith in the Western Nanling Range with an exposure area of more than 3000 km. Available geochronological data indicates that this complex formed by repeated intrusive activities in the Silurian-Devonian (435382 Ma) and late Triassic (ca. 220 Ma). There are more than 100 tungsten, tin and rare metal deposits and occurrences in the periphery of this batholith. Among them, the Youmaling tungsten deposit is located in the southeastern margin of the Miao’ershan pluton. This deposit consists of four mineralization styles (Fig. 1): quartz-vein (type 1), mineralized skarn (type 2), fracture-infillings (type 3) and W-bearing-greisen (type 4) (Yang et al, 2013). The Gaoling tungsten deposit occurs in the northern part of the Youmaling mine and is dominated by vein type mineralization. The quartz veins are about 0.1 to 1.2 m wide and 300 m long. They strike NNE and dip 75°80° to southeast. The mineralization is hosted in mediumand fine-grained two-mica granite that consists of quartz (30% ~35%), K-feldspar (25%~30%), plagioclase (25%~30%), muscovite (8%) and biotite (5%). The accessory minerals are mainly apatite, zircon, monazite, xenotime, allanite and uraninite. The ore minerals are mainly wolframite and scheelite, with subordinate columbite, pyrite, chalcopyrite and molybdenite. The gangue minerals are mostly chlorite, quartz and calcite. The ore-related alteration mainly includes greisenization, chloritization and pyritization. Tungsten mineralization took place in two stages: hightemperature wolframite formation and low-temperature scheelite formation. The wolframite [(Fe0.84Mn0.21)1.05(Nb0.01W0.98)0.99O4] is brownish black, lath shaped, and has high Fe/Mn ratiosindicating its formation at a high temperature condition. The scheelite is pale yellow and paragenetically associated with pyrite, chalcopyrite and molybdenite. It occurs as dissemination and is commonly present as interstial grains between the wolframite crystals (Fig. 2). ZHANG Di , ZHANg Wenlan, WANG Rucheng, HUA Renmin and CHEN Wendi, 2014. New Insights into the Indosinian Mineralization in the Nanling Range: Evidence from the Gaoling Tungsten Deposit. Acta Geologica Sinica (English Edition), 88(supp. 2): 1033-1034.