| 范宏瑞,谢奕汉,赵瑞,王英兰.豫西熊耳山地区岩石和金矿床稳定同位素地球化学研究[J].地质找矿论丛,1994,(1):54-64 |
| 豫西熊耳山地区岩石和金矿床稳定同位素地球化学研究 |
| STABLE ISOTOPE GEOCHEMISTRY OF ROCKS AND GOLD DEPOSITS IN THE XIONGERSHAN AREA WESTERN HENAN PROVINCE |
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| DOI：10.6053/j.issn.1001-1412.1994.1. 007 |
| 中文关键词: 变质岩 花岗岩 金矿床 稳定同位素 地球化学 熊耳山 |
| 英文关键词: |
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| 中文摘要: |
| 对豫西熊耳山地区岩石和金矿床的铅、硫、氧和氢等同位素系统研究表明,尽管本区金矿床的类型不同,赋矿围岩性质也不尽一致,但成矿物质主要来自基底太古界太华群变质岩,成矿热液来源于燕山期花岗岩浆热液活动,金沉淀成矿阶段有大气水的混入。本区不同金矿床甚至同一矿床不同成矿阶段硫同位素组成差异的根本原因不是硫源的不同,而是受控于热液的物理化学条件及其变化。 |
| 英文摘要: |
| The Xiongershan area is located on the southern margin of the north China plateform.Gold deposits in this area can be divided into three types,structral altered rock type,quartz vein type,and blasting-breccia type.Except that blasting-breccia type gold deposit related to granite-porphyry, the other two types can occur in either Archean metamorphic rocks of Taihua group or Proterozoic volcanic rocks of Xionger group.Lead isotope composition and calculated second isochron model-age of gold deposits indicated that material sources for the formation of granitic batholith and gold deposits were mainly from the Archean Taihua group metamorphic rocks.Ranges of δ34S‰ for metamorphic rocks,volcanic rocks and granite are 1.3 to 5.7, 2.5 to 5.4, 1.8 to 5.4, respectively.Sulfur isotope composition for all types gold deposits are different.δ34S‰ for blasting-breccia gold deposit is near zero,indicated that the ore-forming hydrothermal fluid derived from magmatism of granite-porphyry.δ34S‰ for other two types are either positive or negative,even that δ34S‰ for different mineralizing stages for a deposit are inconsistent.For example, δ34S‰ for early stage and gold-deposition stage of the Shanggong deposit are 2.1 to 4.2,-6.3 to -16.3, respectively.The reason causing this difference is physio-chemical condition and variation of hydrothrmal fluids.Respective fluid δ18O‰ and δD‰ for the (1) metamorphic fluids during regional metamorphism-migmatization, (2) magmatic fluids expelled from the granite, (3) gold-bearing hydrothermal fluids of early stage, (4) hydrothermal fluids of gold deposition are :(1) 5.8 to 6.8,and -24.5 to -27.6; (2) 6.6 to 8.5,and -64.7 to -68.7; (3)5.2 to 8.9,and -45.1 to -70.6;and (4) 1.5 to 5.0,and -55.2 to -83.6.These data highlight that ore-forming fluids were related with Yianshanian granitic magmatism,and mixed with meteoric water during gold mineralization.Combined with the geological background,formation of gold deposits in this area is related to activity of syn-tectonic granitic magmatism hydrothermal fluid. |
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