DOI:10.19762/j.cnki.dizhixuebao. 2021101
 
The occurrence and genesis of Bi deposits in the Nanling region
Author NameAffiliationE-mail
FANG Guicong 1) Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration, College of Earth Science, Guilin University of Technology, Guilin, Guangxi, 541004
 2) MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, 100037 
fanggcong@163.com 
WANG Denghong 2) MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, 100037  
CHEN Yuchuan 3) Chinese Academy of Geological Sciences, Beijing, 100037  
HUANG Fan 2) MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, 100037  
WANG Yan 2) MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, 100037  
ZHAO Yunbiao 1) Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration, College of Earth Science, Guilin University of Technology, Guilin, Guangxi, 541004  
LIU Yizhi 1) Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration, College of Earth Science, Guilin University of Technology, Guilin, Guangxi, 541004  
YANG Feng 1) Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration, College of Earth Science, Guilin University of Technology, Guilin, Guangxi, 541004  
Abstract:The Nanling region is the most important Bi metallogenic area in China and even in the world. Despite early efforts, their occurrence and genesis remain unclear. Ourcomprehensive study of the geological survey data and previous research has allowed us to obtain understanding of their spatial and temporal distribution, bismuth mineral characteristics,ore forming material source, and factors influencing precipitation. There are three metallogenic zones (South Hunan province, Chong Yu You and Yu Gan) and six styles of Bi mineralization (hydrothermal quartz vein, skarn, altered granite, fracturezone, filling metasomatism and porphyry). Hydrothermal quartz vein type has the most extensive distribution, but the skarn type enjoys the largest reserves.Both the Bi mineralization and related granitic magma emplacement in the Nanling region mainly occurred at 170~150 Ma. More than thirty bismuth minerals have been found in this region, including natural element, sulfide, sulfosalt, oxide, oxysalt, telluride, bismuthide and fluoride, with the sulfosalt being the most abundant. The bismuth mineral assemblages vary in different deposits, but show certain spatial zonal rules. The ore forming material was derived mainly from granitic magma with the addition ofmantle fluid. The mixture between magmatic fluid and air saturated water at the middle late fluid evolution stagemay have accounted for the mass Bi precipitation.
keywords:bismuth deposit  occurrence characteristics  deposit genesis  Nanling region
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