Origin of the volcanic-hosted Yamansu Fe deposit, Eastern Tianshan, NW China: constraints from pyrite Re-Os isotopes, stable isotopes, and in situ magnetite trace elements
Origin of the volcanic-hosted Yamansu Fe deposit, Eastern Tianshan, NW China: constraints from pyrite Re-Os isotopes, stable isotopes, and in situ magnetite trace elements
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中国西北部东天山火山雅曼苏铁矿床成因：黄铁矿 Re-Os 同位素、稳定同位素和原位磁铁矿微量元素的约束
DOI：
10.1007/s00126-018-0794-4
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发表时间：
2018-01
影响因子：
4.8
通讯作者：
Lyu Chuan
中科院分区：
文献类型：
--
作者：
Huang Xiao-Wen;Zhou Mei-Fu;Beaudoin Georges;Gao Jian-Feng;Qi Liang;Lyu Chuan
中国西北部东天山造山带中的雅满苏铁矿床(含铁51%)产于早石炭世火山-沉积岩中，空间上与夕卡岩共生。共生序列包括石榴石-透辉石(I)、磁铁矿(II)、水合硅酸盐-硫化物(III)和方解石-石英(IV)阶段。与磁铁矿共生的黄铁矿Re-Os等时线年龄为322 ± 7 Ma，代表了黄铁矿的成矿时代，由此推断出磁铁矿的成矿时代。黄铁矿的δ34SVCDT值为− 2.2~+ 2.9‰，δ34SH2S值为− 3.1~2‰，表明硫来源于岩浆。II和IV期方解石的δ13CVPDB值分别为− 2.5~− 1.2‰和− 1.1~1.1‰，δ18OVSMOW值分别为11.8~12.0‰和− 7.7~− 5.2‰。流体CO2的δ~(13)C值和水的δ~(18)O值的计算表明，II期热液来源于岩浆岩，IV期热液与大气降水混合。有些矿石中含有磁铁矿，其化学分带明显，在BSE图像上由暗区和浅区组成。暗区的镁、铝、钙、锰、钛含量较高，而铁、铬含量较低。化学分带是由于流体成分和/或物理化学条件的波动(振荡分带)，或由于晚期大气水稀释的岩浆热液渗入而产生的溶解-沉淀(不规则分带)。铁主要来自与矽卡岩型矿床类似的流体。
The Yamansu Fe deposit (32 Mt at 51% Fe) in the Eastern Tianshan Orogenic Belt of NW China is hosted in early Carboniferous volcano-sedimentary rocks and spatially associated with skarn. The paragenetic sequence includes garnet-diopside (I), magnetite (II), hydrous silicate-sulfide (III), and calcite-quartz (IV) stages. Pyrite associated with magnetite has a Re-Os isochron age of 322 ± 7 Ma, which represents the timing of pyrite and, by inference, magnetite mineralization. Pyrite hasδ34SVCDTvalues of − 2.2 to + 2.9‰, yieldingδ34SH2Svalues of − 3.1 to 2‰, indicating the derivation of sulfur from a magmatic source. Calcite from stages II and IV hasδ13CVPDBvalues from − 2.5 to − 1.2‰, and − 1.1 to 1.1‰, andδ18OVSMOWvalues from 11.8 to 12.0‰ and − 7.7 to − 5.2‰, respectively. Calculatedδ13C values of fluid CO2and waterδ18O values indicate that stage II hydrothermal fluids were derived from magmatic rocks and that meteoric water mixed with the hydrothermal fluids in stage IV. Some ores contain magnetite with obvious chemical zoning composed of dark and light domains in BSE images. Dark domains have higher Mg, Al, Ca, Mn, and Ti but lower Fe and Cr contents than light domains. The chemical zoning resulted from a fluctuating fluid composition and/or physicochemical conditions (oscillatory zoning), or dissolution-precipitation (irregular zoning) via infiltration of magmatic-hydrothermal fluids diluted by late meteoric water. Iron was mainly derived from fluids similar to that in skarn deposits.
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DOI：
10.1007/978-3-319-78527-1
发表时间：
1973
期刊：
Stable Isotope Geochemistry
影响因子：
--
作者：
J. Hoefs
通讯作者：
J. Hoefs
影响因子：
3.3
作者：
Jiahao Zheng;J. Mao;Fuquan Yang;F. Chai;Yongfeng Zhu
通讯作者：
Jiahao Zheng;J. Mao;Fuquan Yang;F. Chai;Yongfeng Zhu
中亚造山带南缘晚泥盆世镁铁质—超镁铁质侵入岩的地球化学和岩石成因意义
影响因子：
3.5
作者：
Xie Wei;Song Xie-Yan
通讯作者：
Song Xie-Yan
影响因子：
2.9
作者：
I. Chou;H. Eugster
通讯作者：
I. Chou;H. Eugster
中国西北部新疆雅曼苏铁矿床中的富铁碎屑：对成矿作用的制约
影响因子：
3
作者：
Zhao-Chong Zhang;Li-Xing Li;Jing Chen;Tong Yao
通讯作者：
Tong Yao