新疆阿尔泰托莫尔特铁(锰)矿成矿作用
Metallogenesis of the Tuomoerte Fe-(Mn) Deposit in Altay, Xinjiang
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摘要: 新疆托莫尔特中型铁(锰)矿床赋存于上志留-下泥盆统康布铁堡组上亚组变质火山-沉积岩系中。本研究利用硫同位素和年代学,探讨该矿床的成矿物质来源、成矿时代和成矿作用。结果表明,矿床的形成经历火山沉积期、岩浆热液叠加改造期和区域变质期。火山沉积期为铁和锰主要成矿期,岩浆热液叠加改造期形成少量铁和铜矿化。火山沉积期黄铁矿的δ34S变化于6.2‰~13.1‰和-20‰,表明硫主要来自火山岩,也有少量来自细菌还原海水中的硫酸盐。岩浆热液叠加改造期硫化物的δ34S变化于-1.8‰~8.5‰,主要集中在-1.8‰~3.8‰,表明硫主要来自黑云母花岗斑岩脉。含矿岩系变流纹岩锆石SHRIMP U-Pb年龄为(406.7±4.3)Ma,穿切矿体的黑云母花岗斑岩脉锆石激光剥蚀-多接收器电感耦合等离子体质谱(LA-MC-ICPMS) U-Pb年龄为(401.6±0.6) Ma,表明托莫尔特铁矿火山沉积期形成的Fe-Mn矿化及岩浆热液叠加改造期形成的Fe-Cu矿化出现在早泥盆世(407~401 Ma),为火山喷发沉积和岩浆侵入活动的产物。Abstract: The Tuomoerte medium type iron deposit can be found in the metavolcanic-sedimentary sequence of the upper Kangbutiebao Formation from the Upper Silurian to Lower Devonian. The source of ore materials, mineralogenetic epoch and metallogenesis were studied by S stable isotope and geochronology and are reported in this paper. Three periods of mineralization can be distinguished on the basis of field evidence and petrographic analyses: volcano-sedimentation, magmatic-hydrothermal, and regional metamorphism. The majority of the Fe-Mn metallogenic activity occurred during the volcano-sedimentation period, some Fe and the majority of Cu mineralization occurred during the magmatic-hydrothermal period. The δ34S values of pyrite from the volcano-sedimentation period ranged from 6.2‰ to 13.1‰ and -20‰, indicating that the sulfur was mainly derived from the volcanic rocks, with some minor contributions from the bacteria-reduced sulphate in the seawater. The δ34S values of pyrite from the magmatic-hydrothermal period ranged from -1.8‰ to 8.5‰ and cluster between -1.8‰ to 3.8‰, indicating that the sulfur was mainly derived from the biotite granite porphyry dyke. The zircon U-Pb age by Laser Ablation-Multicollector Inductively Coupled Plasma-Mass Spectrometry (LA-MC-ICP-MS) of the meta-rhyolite of the Third Member of upper Kangbutiebao Fm is (406.7±4.3) Ma, and the age of biotite granite porphyry dyke, which intrude into Fe orebody, is (401.6±0.6) Ma. The zircon U-Pb ages indicate that the Fe-Mn mineralization period during the volcano-sedimentation and magmatic-hydrothermal periods coincides with early Devonian timing (401-407 Ma). The Fe-Mn and Fe-Cu mineralization were found to be related to volcanic eruption deposition and magma intrusion activities, respectively.
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Keywords:
- iron /
- deposits /
- geological /
- characteristics /
- metallogenesis
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