|Table of Contents|

Geochemical Characteristics of Organic Matters and Metallogenesis of Mayuan Pb-Zn Deposit in the Northern Margin of Yangtze Plate, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2021年第02期
Page:
276-290
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Geochemical Characteristics of Organic Matters and Metallogenesis of Mayuan Pb-Zn Deposit in the Northern Margin of Yangtze Plate, China
Author(s):
GAO Yong-bao1; 2;  LI Kan2;  ZHANG Jiang-wei2;  GUO Wang2;  HAN Yi-xiao2;  LIU Tian-hang1;  CHAO Yin-yin1
(1. Xi'an Center of Mineral Resources Survey, China Geological Survey, Xi'an 710100, Shaanxi, China; 2. Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits of Ministry of Natual Resources, Xi'an Center of Geological Survey, China Geological Survey, Xi'an 710054, Shaanxi, China)
Keywords:
biomarker combination;  C isotope;  Pb isotope;  organic matter;  Pb-Zn deposit;  paleo-oil reservoir;  fluid mixing;  the northern margin of Yangtze plate
PACS:
P611; P618
DOI:
10.19814/j.jese.2021.01037
Abstract:
The relationship between organic matter and metal mineralization has attracted much interest in recent years. The spatial relationships between paleo-oil reservoirs, asphalt and Mayuan Pb-Zn deposit, which is an ideal area in the northern margin of Yangtze plate for studying the relationship between organic matter and Pb-Zn mineralization, are superimposed. The mineralized area is characterized by organic matter, asphalt, and hydrocarbons. The biomarker combinations have low-carbon n-alkanes characteristic of an algae source in the shallow sea environment, and all of them are over-mature evolution. The Pb isotope compositions of the asphalt are 17.946-18.071 206Pb/204Pb, 15.593-15.703 207Pb/204Pb, and 37.812-38.072 208Pb/204Pb with the model ages of 612-478 Ma, which indicate that the asphalt has a Cambrian source. The probable source is Lower Cambrian Guojiaba Formation deposited in a strongly reducing and anoxic highly saline environment, as deduced from the oil-source correlation. The C isotope compositions of various organic matter are the same with δ13C values of -35.3‰--31.4‰, which are consistent with the C isotope compositions for methane and ethane in sphalerite fluid inclusions. All these data are typical for organic carbon. The mineralization of Mayuan Pb-Zn deposit is therefore genetically related to organic matter, and the thermal cracking of the paleo-oil reservoir and TSR produces reduction sulphur. It is deposited in a reducing environment involving the mixture of Pb-Zn-rich brine and fluids containing CH4 and H2S.

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