Characteristics of Pyrite SulfurIsotope of Mn Deposit from Datangpo Formationin Songtao Area,East Guizhou Province and Its Geological Significance
Wang Ping
Zhou Qi
Du Yuansheng
Yu Wenchao
Xu Yuan
Qi Liang
Yuan Liangj un
Abstract：Songtao area,East Guizhou Province,is an important area rich in manganese ore deposit,of which there are relative-ly big differences between pyriteδ34 S values.This paper focuses on the sulfur isotope composition of pyrite from dialogite sam-ples in Lij iawan,Daotuo and Xixibao areas in Songtao.CF-IRSM results indicate two obvious characteristics:(1 )the pyrites mostly have extremely highδ34 S values,which vary between 47.69‰-66.76‰;(2)theδ34 S values of pyrites in shallow wa-ter Lijiawan area (47.69‰-59.15‰)are obviously lower than those in deep water Daotuo area (53.85‰-62.86‰)in the same basin,and theδ34 S values of pyrites in central facies (53.85‰-66.76‰)are obviously higher than those in transition fa-cies (47.69‰-59.15‰),the sulfur isotope compositions of pyrites have distinctive depth gradient effect.The extremely highδ34 S values and distinctive depth gradient features of pyrites in Mn deposit in Datangpo Formation indicate that the ocean has extremely low sulfate concentration and obvious stratified phenomenon.The deep ocean has not been completely oxidized at the beginning of interglacial period after Neoproterozoic sturtian glaciation.
Keywords：Mn depositS isotopeDatangpo FormationSongtaostratigraphy
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 2031-2040 )