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Geoscience ›› 2019, Vol. 33 ›› Issue (06): 1286-1294.DOI: 10.19657/j.geoscience.1000-8527.2019.06.14

• Petrology and Ore Deposits • Previous Articles     Next Articles

Geochemical Features and Genesis Analysis of the Zhongba Scaly Graphite Deposit in Sichuan Province

XIA Jinsheng1,2,3(), SUN Li1,4(), XIAO Keyan1,4, WANG Junzhu2, CHEN Xian3, CUI Ning1,4   

  1. 1. MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
    2. Natural Resources Bureau of Liupanshui, Liupanshui, Guizhou 553000, China
    3. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
    4. Center of Metallogenic Regularity and Prediction, China Geological Survey, Beijing 100037, China
  • Received:2018-04-18 Revised:2019-03-30 Online:2019-12-26 Published:2019-12-27
  • Contact: SUN Li

Abstract:

The Zhongba scaly graphite deposit, one of the important graphite deposits in China, with a proved reserve of 15.55 million tons, located on the western margin of central Xikang-Yunnan axis. The study on the geological and geochemical features could be used to help define the genesis of the deposit. Through the field and microscopic observation combining with major and trace elements analysis,the graphite ore bodies are hosted in white mica quartz schist of Datian Formation, Huili Group in Pre-Sinian system in the form of layers and lens. The average grade is 12.19%. Big flake graphite (>0.15 mm) occupies 67% of the total graphite while the small to mediate ones occupies 33%. The graphite-bearing metamorphic rock is rich in SiO2 with poor CaO and LOI. The high field strength elements vary little in the ore. Ni/Co value varies from 15.92 to 41.04 indicating oxygen poor or anaerobic environment. The total REE content is relatively high with high differentiation degree. Light REE content is higher than that of HREE with negative Eu and Ce value. The test results of graphite δ13C is from -27.64% to -28.44%, and the average is -28.14%, indicating the causes of graphite is the organic carbon. So, the Zhongba deposit is a regional metamorphic scaly graphite deposit of organic carbon origin.

Key words: Zhongba,Sichuan, scaly graphite deposit, geochemical feature, ore genesis

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