期刊文献+

内蒙乌拉山金矿床钾长石的矿物化学及有序度的分析(英文) 被引量:8

Chemical and structural characteristics of K feldspars and their constrains to formation conditions of the Wulashan gold deposit, China
下载PDF
导出
摘要 采用电子探针显微分析(EMPA)和粉末X射线衍射(XRD)分析了采自乌拉山金矿床含金钾长石石英脉、石英脉以及其他类型岩石中的10 0多个钾长石样品的化学成分和结果状态,并采用R和Q模式聚类分析、Spearman等级相关分析方法对实验数据进行了统计分析。结果表明,含金矿脉、岩浆热液脉和蚀变花岗岩中的钾长石为中等到最大微斜长石,其特征为K2 O含量高,但相对而言,Na2 O、CaO和BaO的含量低。其他岩石类型中的钾长石的化学成分和结果状态变化很大,可以从透长石、正长石到微斜长石,其特征为K2 O的含量相对较低,但Na2 O、CaO和BaO的含量相对较高。含金样品中的钾长石通常更富K2 O ,表明金的成矿作用与富钾的热液流体和碱质交代作用有关。乌拉山金矿床的成矿作用分为两个阶段,主要的含金钾长石石英脉中的钾长石富K2 O ,形成温度为30 7~379℃,平均为35 3℃;第二阶段含金石英脉中的钾长石含K2 O较低,形成温度为2 6 0~318℃,平均为2 81℃。这些结果表明成矿流体与岩浆热液作用有关,流体朝温度降低、K2 O含量降低的方向演化,K2 O含量高的热液流体和2 6 0~380℃的形成温度有利于金的成矿作用。 More than one hundred K feldspars were collected from gold-bearing Vein Ⅰ (K feldspar-quartz vein) and Vein Ⅱ (quartz vein) as well as various other rock types in the Wulashan gold deposit, China. Chemical compositions of K feldspars were analyzed using electron microprobe analysis (EMPA). The powder X-ray diffraction (XRD) patterns of K feldspars were collected using Cu Kα source. Au contents of the corresponding ore samples were analyzed by fire assay. Q- and R-mode cluster analysis and Spearman rank correlation analysis of the experimental data were performed. The results indicate that K feldspars from gold-bearing veins, magmatic hydrothermal veins and altered wall rocks are intermediate to maximum microclines characterized by higher content of K-2O, lower contents of Na-2O, CaO and BaO, and relatively small variations in chemical compositions. K feldspars from other rock types are likely sanidine, orthoclase or microclines that show greater variations in chemical compositions and are characterized by lower content of K-2O but higher contents of Na-2O, CaO and BaO. K feldspars from auriferous samples are much richer in K-2O, indicating that gold mineralization might have been related to potassic hydrothermal fluids and intense K feldspar metasomatism. There exist two gold mineralization stages in the Wulashan deposit. K feldspars from the major K feldspar-quartz veins are characterized by higher K-2O and higher formation temperatures of 307~379℃ with an average of 353℃. K feldspars from the quartz veins of the second stage are characterized by lower K-2O and lower formation temperatures of 260~318℃ with an average of 281℃. These results indicate that the mineralization fluids were associated with magmatic hydrothermal events and evolved toward lower temperatures and lower content of K-2O, but the hydrothermal fluids of higher K-2O and the temperatures of 260~380℃ may favor gold mineralization.
机构地区 中国地质大学
出处 《岩石矿物学杂志》 CAS CSCD 北大核心 2005年第3期221-230,共10页 Acta Petrologica et Mineralogica
基金 教育部科学技术研究基金资助项目 (95 49115 )
关键词 乌拉山金矿床 钾长石 矿物化学 Al-Si有序度 统计分析 The Wulashan gold deposit K feldspar, mineral chemistry Al-Si degree of order statistical analysis
  • 相关文献

参考文献5

二级参考文献29

  • 1武警黄金指挥部.内蒙古自治区哈达门沟伟晶岩金矿地质[M].北京:地震出版社,1995.. 被引量:3
  • 2BARTH, T.F.W. 1951. The feldspar geologic thermometers. Neues Jahrb. Mineral. Abh., 82: 143-154. 被引量:1
  • 3BENCE, A.E. & ALBEE, A.L. 1968. Empirical correction factors for electron microanalysis of silicates and oxides. J. Geol., 76: 382-403. 被引量:1
  • 4ELKINS, L.T. & GROVE, T.L. 1990. Ternary feldspar experiments and thermodynamic Models. Am. Mineral., 75: 544-559. 被引量:1
  • 5FUHRMAN, M.L. & LINDSLEY, D.H. 1988. Ternary feldspar modeling and thermometry. Am. Mineral., 74: 201-215. 被引量:1
  • 6GAN, S.F., QIU, Y.M., YANG, H.Y. & VAN REENEN, D.D. 1994. The Hadamengou mine: a typical gold deposit in the Archean granulite facies terrane of the North China craton. Int. Geol Rev., 36: 850-866. 被引量:1
  • 7GHIORSO, M.S. 1984. Activity/composition relations in the ternary feldspars. Contrib. Mineral. Petrol., 87: 282-296. 被引量:1
  • 8GREEN, N.L. & UDANSKY, S.I. 1986. Ternary-feldspar mixing relations and feldspar thermometry. Am. Mineral., 71: 1 100-1 108. 被引量:1
  • 9HART, C.J.R., GOLDFARB, R.J. & QIU, Y.M. 2002. Gold deposits of the northern margin of the North China Craton: multiple late Paleozoic-Mesozoic mineralizing events. Mineral. Deposita., 37: 326-351. 被引量:1
  • 10HESELTON, H.T. Jr., HOVIS, G.L., HEMINGWAY, B.S. & ROBIE, R.A. 1983. Calorimetric investigation of the excess entropy of mixing in analbite-sanidine solid solutions: Lack of evidence for Na, K short-range order and implications for two feldspar thermo 被引量:1

共引文献32

同被引文献95

引证文献8

二级引证文献33

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部