| 王自力.河北省西石门金矿稳定同位素特征
及其成矿地质意义[J].地质与勘探,2011,47(6):1026-1034 |
| 河北省西石门金矿稳定同位素特征
及其成矿地质意义 |
| Characteristics and Geological Significance of Stable Isotopesin the Xishimen Gold Deposit of Hebei Province |
| 投稿时间：2009-11-19 修订日期：2010-07-06 |
| DOI： |
| 中文关键词: 金矿 同位素 地质意义 西石门 河北 |
| 英文关键词: gold deposit,isotope,geological significance,Xishimen,HeBei Province |
| 基金项目:国家自然科学基金项目(40872137,40272088)、河北省自然科学基金(D2007000751、D2008000534)资助 |
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| 中文摘要: |
| [摘 要]西石门金矿位于阜平幔枝构造轴部,燕山期麻棚岩体的东南侧。本文对矿区及区域上部分金属矿床的硫、铅、氢、氧、碳同位素进行了系统研究,研究结果表明:矿石中金属硫化物的δ34S 介于-0.3‰～+1. 4‰,平均0.63‰,,与区域上硫同位素组成相一致,均落入幔源硫范围,表明硫主要来自深源;铅同位素变化范围较小, 与区域上的铅组成相一致,表明它们具有相同的来源。在铅构造模式图上,所有的铅同位素均位于上地幔与下地壳之间;氢、氧同位素表明成矿流体早期以岩浆水为主,后期混入了部分大气降水;碳同位素表明矿区成矿热液中来自地幔,因此研究认为矿区内的成矿物质主要来源于地球深部,导致成矿物质向上迁移的动力机制为地幔热柱多级演化。在其上升过程中,混入了部分壳源物质,使得同位素往往表现出介于幔源与壳源之间的特征。 |
| 英文摘要: |
| Abstract:Xishimen gold deposit is located in axis of Fuping mantle branch structure, Southeast of Yanshanian Mapeng granitic intrusion. In this paper, based systematic analysis on sulfur, lead, hydrogen, oxygen and carbon isotopic composition of Xishimen deposit and deposits in the region, the results show that: the sulfide δ34S ranges from -0.3‰～+1.4‰, average 0.63‰, consistent with sulfur isotopic composition of the region, Falling
into the range of mantle-derived sulfur, indicating that sulfur is mainly deep source; lead isotope range narrowly, consistent with lead isotopic composition of the region, indicating that they are of the same source. In the Lead isotopic composition, all the lead isotopes falled between the upper mantle and lower crust; hydrogen and oxygen isotopes show that the ore-forming fluids are mainly magmatic water in the early stage and mixed with some of the meteoric water in the later; carbon isotopes show that the ore-forming hydrothermal fluids derived from the mantle, Therefore, it have shown that the ore-forming materials of Xishimen gold deposit should come from the deep interior of the Earth, and the dynamic mechanism of ore-forming materials moving upwards is the multi-stage evolution of mantle plume. During the multi-stage evolution of mantle plume, especially the ore-forming materials found their way into the crust vias the mantle, it is inevitable that some crustal material would have been involved. Therefore, the measured isotope data always fall between the typical mantle-source area and the crust-source area. |
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