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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第34卷

期数:

2012年第03期

页码:

17-31

栏目:

基础地质与矿产地质

出版日期:

2012-09-20

文章信息/Info

Title:

Ore-forming Fluid and Metallogenic Process of Iron Deposit in Altay of Xinjiang

作者:

杨富全¹; 刘锋¹; 柴凤梅²; 张志欣³; 耿新霞¹; 吕书君⁴

1.中国地质科学院矿产资源研究所 国土资源部成矿作用与资源评价重点实验室,北京 100037; 2.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 830004; 3.中国科学院新疆生态与地理研究所 新疆矿产资源研究中心,新疆 乌鲁木齐 830011; 4.中国地质大学北京地球科学与资源学院,北京 100083

Author(s):

YANG Fu-quan¹;  LIU Feng¹;  CHAI Feng-mei²;  ZHANG Zhi-xin³;  GENG Xin-xia¹;  LU Shu-jun⁴

1. Key Laboratory of Metallogeny and Mineral Assessment of Ministry of Land and Resources, Institute ofMineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China; 2. Xinjiang Key Laboratory for Geodynamic Processes and Metallogenic Prognosis of the Central Asian Orogenic Belt, Xinjiang University, Urumqi 830004, Xinjiang, China; 3. Xinjiang Research Center for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, China; 4. School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China

关键词:

铁矿;  地质特征;  成矿流体;  成矿过程;  构造演化;  阿尔泰;  新疆

Keywords:

iron deposit;  geological characteristic;  ore-forming fluid;  metallogenic process;  tectonic evolution;  Altay;  Xinjiang

分类号:

P618.31

DOI:

-

文献标志码:

-

摘要:

以新疆阿尔泰铁矿为研究对象,综述铁矿成矿背景,划分成因类型和成矿时期,对典型矿床地质特征进行描述,研究成矿流体的温度和盐度以及成矿流体来源,最后探讨构造演化与铁矿成矿作用。结果表明:铁矿成因类型可划分为火山岩型、矽卡岩型、伟晶岩型、与花岗岩有关的热液型、与基性岩体有关的钒钛磁铁矿型和砂矿型; 矽卡岩矿床流体包裹体从矽卡岩阶段到退化蚀变阶段再到石英-硫化物-碳酸盐阶段的均一温度(从200 ℃～500 ℃到200 ℃～350 ℃,再到160 ℃～300 ℃)以及流体盐度(NaCl_eq)峰值(从4.5%～21.5%到3.5%～20.5%,再到1.5%～17.5%)逐渐降低; 托莫尔特铁(锰)矿沉积期成矿流体以中低温(集中在160℃～300℃)、低盐度(主要集中在4%～9%和14%～20%)为特征; 两棵树伟晶岩型铁矿成矿流体为中温(173 ℃～290 ℃)、低盐度(0.35%～16.05%); 氢和氧同位素特征表明,火山沉积型铁矿沉积期成矿流体是海水与岩浆水的混合,矽卡岩阶段成矿流体主要为岩浆水,石英-硫化物-碳酸盐阶段成矿流体主要为大气降水,混合少量岩浆水,同时两棵树伟晶岩型铁矿成矿流体主要来源于岩浆水和大气降水的混合; 碳和氧同位素表明,矽卡岩型铁矿成矿流体中碳主要来自深部岩浆,少量来自海相碳酸盐岩。

Abstract:

Based on the iron deposits in Altay of Xinjiang, the metallogenic setting of iron deposits were reviewed, the genetic types and mineralization period of iron deposits were divided, geological characteristics of typical deposits were described, the temperature and salinity of ore-forming fluid and its source were analyzed, and the tectonic evolution and metallogenesis were discussed. The results showed that the genetic types of iron deposits were dominantly volcanic rock, skarn, pegmatite, hydrothermal related with granite, V-Ti-magnetite related with basic massif and placer; homogenization temperatures of fluid inclusion in skarn type deposit from skarn to retrograde alteration until quartz-sulfide-carbonate stages gradually decreased from 200 ℃-500 ℃ to 200 ℃-350 ℃ until 160 ℃-300 ℃, and the peak of fluid salinities(NaCl_eq)also decreased from 4.5%-21.5% to 3.5%-20.5% until 1.5%-17.5%, respectively; ore-forming fluids in the sedimentation period of Tuomoerte iron(manganese)deposit were characterized by low-medium temperature(mainly 160 ℃-300 ℃)and low salinity(mainly 4%-9% and 14%-20%); ore-forming fluids in Liangkeshu iron deposit with pegmatite type were characterized by medium temperature(173 ℃-290 ℃)and low salinity(0.35%-16.05%). Hydrogen and oxygen isotope compositions suggested that the ore-forming fluids in the sedimentation period of iron deposit with volcanic sedimentary type were mainly derived from the mixture of seawater and magmatic fluid; the ore-forming fluids in skarn and quartz-sulfide-carbonate stages were mainly derived from magmatic fluid and atmospheric precipitation mixed with a little of magmatic fluid, respectively; the ore-forming fluids in Liangkeshu iron deposit with pegmatite type were mainly derived from the mixture of magmatic fluid and atmospheric precipitation. Carbon and oxygen isotope compositions suggested that the carbon in the ore-forming fluids of iron deposits with skarn type was mainly derived from deep magmatic, and a little from marine carbonate rocks.

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备注/Memo

备注/Memo:

收稿日期:2012-06-11
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科研专项经费项目(201211073)
作者简介:杨富全(1968-),男,河北蔚县人,研究员,博士研究生导师,E-mail:fuquanyang@163.com。

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更新日期/Last Update: 2012-09-20