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Oxygen Isotope Study of Magnetite from Chengchao Iron Deposit, Southeastern Hubei Province
Author(s) -
LI Wei,
XIE Guiqing,
ZHU Qiaoqiao,
SONG Yingxin,
ZHANG Zhiyuan
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 - 10.1111/1755-6724.12368_13
Subject(s) - beijing , metallogeny , china , chinese academy of sciences , geology , geochemistry , archaeology , geography , pyrite , sphalerite
The Chengchao iron deposit, which contains 270 Mt Fe ores, is the largest skarn iron deposit in the Middle-Lower Yangtze River Valley metallogenic belt, which is a world class Fe-Cu-Au polymetallic ore belt. Therefore, study the ore genesis of Chengchao iron deposit has crucial scientific and economic significance, but its ore genesis has long been contentious, mainly including the follow opinions: (1) directly from ore magma (Shi et al., 1981), (2) both ore magma and hydrothermal metasomatism (Zhai et al., 1992), (3)hydrothermal metasomatism (Shu et al.,1992; Xie et al.,2012). It can be obviously seen that these debates mainly focus on whether there exited ore magma processes. Magnetite, as the most important ore mineral, can provide convincing evidence to constraint this debate. Previous studies show that there are obvious differences on composition and oxygen isotope of magnetite from both typical ore magma and hydrothermal replacement deposits. Meanwhile, the EMP analyses on the magnetite indicate that the magnetite were formed through hydrothermal metasomatism of the marine carbonates by magmatic-derived fluids in the Chengchao deposit (Hu et al., 2014). In this contribution, oxygen isotope analyses of magnetite samples without multiple generations were carried out, aiming to further constraint on the ore genesis and ore formation process.