| 张海东.山西平顺西安里铁矿成矿流体特征及演化[J].地质与勘探,2014,50(1):67-76 |
| 山西平顺西安里铁矿成矿流体特征及演化 |
| Characteristics and Evolution of Ore-forming Fluids in the Xi'anli Iron Deposit in Pingshun, Shanxi Province |
| 投稿时间：2012-05-15 修订日期：2013-01-11 |
| DOI： |
| 中文关键词: 新田金矿 平顶山组 播卡金矿 汤丹群 会东 |
| 英文关键词: Xi'anli iron deposit, characteristics of ore-forming fluids, natriumzation, H-O isotopes |
| 基金项目:国家自然科学基金(编号41040020, 41073027)、中国地质调查局项目(编号1212011121076)和中央高校基金(编号CHD2011ZY005, CHD2011JC168)资助 |
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| 中文摘要: |
| [摘 要]对西安里铁矿床蚀变矿物（透辉石、石榴子石、绿帘石和方解石）流体包裹体进行了岩相学、均一温度、盐度和H-O同位素组成分析研究，结果表明：透辉石中流体包裹体均一温度为515℃～622℃，盐度（w（NaCl））为48～75；石榴子石均一温度为475℃～525℃，w（NaCl）均小于26wt%NaCl；绿帘石均一温度为390～440℃，盐度主要分布在40 wt%NaCl左右；方解石均一温度为141～4066oC，w（NaCl）为6.74～21.11；石榴石、透辉石的δDSMOW值介于-106‰～-86‰，δ18OSMOW值介于6.7～8.7‰，δ18OH2O值介于2.7‰～8.7‰。磁铁矿δ18OH2O值介于2.6‰～6.2‰。综合分析认为：热液主要来源于岩体，在上升过程中萃取了围岩中Na和Cl，Na的加入使大量Fe析出并与Cl结合进行迁移，流体物理化学特征具有显著的变化，导致Fe质析出形成西安里铁矿床。 |
| 英文摘要: |
| Abstract: This work studies the fluid inclusions from altered minerals (diopside, garnet, epidote, and calcite) in the Xi’anli iron deposit of Shanxi Province based on their petrography, homogenization temperature, salinity, and H-O isotopic compositions. The results show that homogenization temperature of the fluid inclusions in diopside varies from 515℃ to 622℃, and their salinity is between 48 and 75. Fluid inclusion homogenization temperature of garnet is from 475℃ to 525℃, with w(NaCl) less than 26 wt%. Fluid inclusion homogenization temperature of epidote is in 390~440℃, with salinity 40wt% NaCl. Fluid inclusion homogenization temperature and salinity of calcite are in the rang of 141~4066oC with 6.74~21.11wt%NaCl. δDSMOW of garnet and diopside ranges from -106‰ to -86‰, δ18OSMOW ranges from 6.7 to 8.7‰, and δ18OH2O from 2.7‰ to 8.7‰. δ18OH2O of magnetite is from 2.6‰ to 6.2‰. The synthetic analysis suggests that the hydrothermal fluid mainly originated from rock mass. During the rising process, the magmatic hydrothermal solution extracted Na and Cl from surrounding rocks. The addition of Na resulted in the precipitation of much Fe, and made Fe combine with Cl, and then migrate. The significant variations of physical and chemical properties led to the precipitation of Fe and the formation of the Xi'anli iron deposit. |
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