Details
| Original language | English |
|---|---|
| Pages (from-to) | 1207-1222 |
| Number of pages | 16 |
| Journal | Economic geology |
| Volume | 114 |
| Issue number | 6 |
| Publication status | Published - 1 Sept 2019 |
Abstract
Submarine volcanic-hosted iron deposits are important sources of iron ore in northwestern China. Here we present the petrological characteristics and coupled Fe-O, C, and Si isotope data of iron ores from the Shikebutai submarine volcanic-hosted hematite deposit in the Western Tianshan region. Several stratiform and lenticular hematite-dominated orebodies occur in Carboniferous submarine volcano-sedimentary sequences in this region. The ores are mainly composed of hematite, quartz, and minor siderite with distinct alternating iron-rich and silica-rich bands. The hematite shows δ56Fe and δ18O values in the range of –0.31 to 0.80 and 2.2 to 7.0, respectively, and the jasper yields δ30Si values of –1.90 to –1.20. Iron and Si were both derived from hydrothermal fluids related to submarine magmatism/volcanism. The Fe-bearing minerals in the Shikebutai deposit define distinct formation pathways. Hematite is the primary dehydrated Fe(III) oxyhydroxide, and the Fe isotope data indicate fractionation resulting from the partial oxidation of Fe(II). The O isotope data reflect inheritance from the submarine hydrothermal fluids source. Jasper was produced during coprecipitation of silica adsorbed onto the Fe(III) oxyhydroxides. The siderite-rich iron ore/volcaniclastic rock samples with a high and variable total organic carbon content (0.14–5.57%) show negative δ13C values (–3.0 to –1.1) and light δ56Fe values (–1.11 to –0.84). Our isotope data, together with the common occurrence of hematite inclusions in siderite, suggest that siderite was mainly produced by microbial dissimilatory iron reduction during diagenesis. The geologic, petrological, and isotopic data suggest that the Carboniferous Shikebutai deposit was precipitated through chemical and biogenic processes.
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geophysics
- Earth and Planetary Sciences(all)
- Geology
- Earth and Planetary Sciences(all)
- Geochemistry and Petrology
- Earth and Planetary Sciences(all)
- Economic Geology
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In: Economic geology, Vol. 114, No. 6, 01.09.2019, p. 1207-1222.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - The Carboniferous Shikebutai Iron Deposit in Western Tianshan, Northwestern China
T2 - Petrology, Fe-O-C-Si Isotopes, and Implications for Iron Pathways
AU - Yang, Xiuqing
AU - Mao, Jingwen
AU - Jiang, Zongsheng
AU - Santosh, M.
AU - Zhang, Zuoheng
AU - Duan, Shigang
AU - Wang, Dachuan
PY - 2019/9/1
Y1 - 2019/9/1
N2 - Submarine volcanic-hosted iron deposits are important sources of iron ore in northwestern China. Here we present the petrological characteristics and coupled Fe-O, C, and Si isotope data of iron ores from the Shikebutai submarine volcanic-hosted hematite deposit in the Western Tianshan region. Several stratiform and lenticular hematite-dominated orebodies occur in Carboniferous submarine volcano-sedimentary sequences in this region. The ores are mainly composed of hematite, quartz, and minor siderite with distinct alternating iron-rich and silica-rich bands. The hematite shows δ56Fe and δ18O values in the range of –0.31 to 0.80 and 2.2 to 7.0, respectively, and the jasper yields δ30Si values of –1.90 to –1.20. Iron and Si were both derived from hydrothermal fluids related to submarine magmatism/volcanism. The Fe-bearing minerals in the Shikebutai deposit define distinct formation pathways. Hematite is the primary dehydrated Fe(III) oxyhydroxide, and the Fe isotope data indicate fractionation resulting from the partial oxidation of Fe(II). The O isotope data reflect inheritance from the submarine hydrothermal fluids source. Jasper was produced during coprecipitation of silica adsorbed onto the Fe(III) oxyhydroxides. The siderite-rich iron ore/volcaniclastic rock samples with a high and variable total organic carbon content (0.14–5.57%) show negative δ13C values (–3.0 to –1.1) and light δ56Fe values (–1.11 to –0.84). Our isotope data, together with the common occurrence of hematite inclusions in siderite, suggest that siderite was mainly produced by microbial dissimilatory iron reduction during diagenesis. The geologic, petrological, and isotopic data suggest that the Carboniferous Shikebutai deposit was precipitated through chemical and biogenic processes.
AB - Submarine volcanic-hosted iron deposits are important sources of iron ore in northwestern China. Here we present the petrological characteristics and coupled Fe-O, C, and Si isotope data of iron ores from the Shikebutai submarine volcanic-hosted hematite deposit in the Western Tianshan region. Several stratiform and lenticular hematite-dominated orebodies occur in Carboniferous submarine volcano-sedimentary sequences in this region. The ores are mainly composed of hematite, quartz, and minor siderite with distinct alternating iron-rich and silica-rich bands. The hematite shows δ56Fe and δ18O values in the range of –0.31 to 0.80 and 2.2 to 7.0, respectively, and the jasper yields δ30Si values of –1.90 to –1.20. Iron and Si were both derived from hydrothermal fluids related to submarine magmatism/volcanism. The Fe-bearing minerals in the Shikebutai deposit define distinct formation pathways. Hematite is the primary dehydrated Fe(III) oxyhydroxide, and the Fe isotope data indicate fractionation resulting from the partial oxidation of Fe(II). The O isotope data reflect inheritance from the submarine hydrothermal fluids source. Jasper was produced during coprecipitation of silica adsorbed onto the Fe(III) oxyhydroxides. The siderite-rich iron ore/volcaniclastic rock samples with a high and variable total organic carbon content (0.14–5.57%) show negative δ13C values (–3.0 to –1.1) and light δ56Fe values (–1.11 to –0.84). Our isotope data, together with the common occurrence of hematite inclusions in siderite, suggest that siderite was mainly produced by microbial dissimilatory iron reduction during diagenesis. The geologic, petrological, and isotopic data suggest that the Carboniferous Shikebutai deposit was precipitated through chemical and biogenic processes.
UR - http://www.scopus.com/inward/record.url?scp=85072947408&partnerID=8YFLogxK
U2 - 10.5382/econgeo.4681
DO - 10.5382/econgeo.4681
M3 - Article
AN - SCOPUS:85072947408
VL - 114
SP - 1207
EP - 1222
JO - Economic geology
JF - Economic geology
SN - 0361-0128
IS - 6
ER -