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Petrographic and Fe Isotopic Constraints on the Genesis of the Shilu Fe Ore Deposit in Hainan Province, China
Author(s) -
SUN Jian,
ZHU Xiangkun,
LI Zhihong
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 - 10.1111/1755-6724.12384_13
Subject(s) - chinese academy of sciences , beijing , geology , china , petrography , structural geology , isotope geochemistry , geochemistry , marine geology , earth science , library science , archaeology , isotope , oceanography , geography , physics , quantum mechanics , computer science
The Shilu Fe ore deposit in Hainan province, China, is known as the richest Feore deposit in Asia. This deposit comprises hematite-rich Fe-ores, locally with magnetiterich Fe-ores and subordinate Co, Cu, Ni, Pb– Zn and Ag resources, as well as dolomite, barite, gypsum and sulfur. The ores are hosted in dolomite marble of Neoproterozoic Shilu Group. The deposit consists of many lensshape Orebodies, with the largest one named as Beiyi Orebody, which possess nearly 80% iron resources of the Shilu deposit. The iron ores are mostly high-grade hematite ores, associated with some low-grade hematitemagnetite ores and jasper. The deposit was overprinted by multi-stages of metamorphism and deformation (SCISTCAS, 1986; Xu et al., 2013). Its genesis is still unclear due to its complicated geological characteristics. Several models have been proposed: 1) high-temperature hydrothermal origin (skarn type deposit). It is suggested that the ores were formed as a result of high-T hydrothermal contact-metasomatism; 2) Magmaticvolcanic origin. It is believed that the ores were actually erupted volcano. 3) Exhalative sedimentary origin. The ores were resulted from the volcano-related exhalation, overprinted by multiple stages of memorphism and deformation (SCISTCAS, 1986). Here the jasper, especially the fine-grained jasper that may not be detected by naked eye, and Fe ores from the deposit are carefully investigated for their geological characters. Based on these, the Fe isotope compositions of the jasper and ores were investigated. The results provide robust evidence for the exhalative sedimentary origin of the original deposit.