| 辽东砖庙矿区硼矿床的海相蒸发成因——来自硼、硫、碳同位素的证据 |
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| 关键词:Liaohe Group Lieryu Formation Zhuanmiao Mg-borate ore district boron isotope sulfur isotope carbon isotope |
| 基金项目:国土资源部公益性行业科研专项(编号: 201211074-2; 200911043-20) |
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| Marine Evaporative Genesis of Mg-borate Deposits in the Zhuanmiao Ore District, Eastern Liaoning Province: Evidence from B, S, C Isotopes |
| Zhuanmiao Mg-borate ore bodies exhibit layered or lenticular structure in the wall rocks of serpentinized marbles, which are located in the lower strata of volcanic-sedimentary Lieryu Formation in Kuandian County of eastern Liaoning Province. The authors applied LA-MC-ICP-MS in-situ technology to analyze the B isotopic composition of borate ores in the Zhuangmiao Mg-borate ore district, and systematically studied the S and C stable isotopic compositions of the ores and marbles. The δ11BNIST SRM-951 values of Mg-borate ores vary from 12.6‰ to 13.9‰, showing marine evaporative characteristics; the δ34SV-CDT values of Mg-borate ores and serpentinized marble vary from 11.6‰ to 24.3‰, suggesting marine sedimentary characteristics; (3) the δ13CV-PDB values of serpentinized marble vary from –4.6‰ to –0.5‰, while those of marble vary from 4.1‰ to 4.6‰, exhibiting positive carbon isotopic anomaly of Paleoproterozoic marine carbonates. Therefore, the ore-forming environment of the Mg-borate deposit in Zhuanmiao area was probably an alternate cycle of marine sedimentation and volcanism of the littoral facies, while a suite of homochronous Mg-rich ultrabasic volcanic rocks covered the borate deposits and preserved the borate ores during hydrothermalism and metamorphism at late stages, and formed a unique rock unit of borate minerals, carbonates and ultrabasic minerals. |
| HU Gu-yue,FAN Chang-fu,LI Yan-he,HOU Ke-jun,LIU Yi,CHEN Xian.2014.Marine Evaporative Genesis of Mg-borate Deposits in the Zhuanmiao Ore District, Eastern Liaoning Province: Evidence from B, S, C Isotopes[J].Acta Geoscientica Sinica,35(4):445-453. |
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