岩矿测试

文章摘要

杨富全,郭旭吉,黄承科,刘锋,柴凤梅,耿新霞,张保江.新疆阿尔泰托莫尔特铁(锰)矿成矿作用[J].岩矿测试,2012,31(5):906-914

YANG Fu-quan,GUO Xu-ji,HUANG Cheng-ke,LIU Feng,CHAI Feng-mei,GENG Xin-xia,ZHANG Bao-jiang.Metallogenesis of the Tuomoerte Fe-(Mn) Deposit in Altay, Xinjiang[J].Rock and Mineral Analysis,2012,31(5):906-914.DOI:

新疆阿尔泰托莫尔特铁(锰)矿成矿作用

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Metallogenesis of the Tuomoerte Fe-(Mn) Deposit in Altay, Xinjiang

投稿时间：2012-02-22

DOI：

中文关键词: 铁矿床地质特征成矿作用托莫尔特阿尔泰

英文关键词: iron deposits geological characteristics metallogenesis Tuomoerte Altay

基金项目:国家科技支撑计划项目(2006BAB07B02-01,2011BAB06B03-02); 国土资源部公益性行业专项经费项目(201211073)

作者	单位
杨富全	国土资源部成矿作用与资源评价重点实验室, 中国地质科学院矿产资源研究所, 北京 100037
郭旭吉	新疆维吾尔自治区有色地质勘查局706队, 新疆阿勒泰 836500
黄承科	新疆维吾尔自治区有色地质勘查局706队, 新疆阿勒泰 836500
刘锋	国土资源部成矿作用与资源评价重点实验室, 中国地质科学院矿产资源研究所, 北京 100037
柴凤梅	新疆大学新疆中亚造山带大陆动力学与成矿预测实验室, 新疆乌鲁木齐 830046
耿新霞	国土资源部成矿作用与资源评价重点实验室, 中国地质科学院矿产资源研究所, 北京 100037
张保江	河北省地矿局第四水文工程地质大队, 河北沧州 061000

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中文摘要:

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。

英文摘要:

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.

主管单位：	中国科学技术协会
主办单位：	中国地质学会岩矿测试技术专业委员会国家地质实验测试中心