| The Isotopic Composition of Noble Gases in Gold Deposits and the Source of Ore- Forming Materials in the Region of North Hebei, China |
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| 作者姓名： | 王宝德 牛树银 孙爱群 李红阳 |
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| 作者单位： | Shijiazhuang University of Economics，Shijiazhuang University of Economics，Shijiazhuang University of Economics，Shijiazhuang University of Economics Shijiazhuang 050031，China，Shijiazhuang 050031，China，Shijiazhuang 050031，China，Shijiazhuang 050031，China |
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| 基金项目： | FundedjointlybytheNationalNaturalScienceFoundationofChina (No .4 0 2 72 0 88)，theGeologicalSurveyingProject (No .2 0 0 0 1 1 0 1 0 0 0 38)，andtheFoundationforBack boneTeachersatHigherLearningSchools (No .J 2 0 0 0 2 5 ) . |
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| 摘 要： | 1IntroductionOnthenorthernmarginoftheNorthChinaplatformislocatedoneofthemostimportantAu Ag polymetallicore concentratedzones,wherethereareavarietyoforetypes .Soithasbeenat tractingeverincreasingattentionofmanygeologists (PeiRongfuetal.,1 998;ShenBaofengetal.,1 994 ;LuSongnianetal.,1 997;HuShouxietal.,1 994 ;ChenYuchuan ,1 999;ZhaiYushengetal.,1 999) .Manyscholarspresentedtheirresearchresultsinvariousaspects.How ever ,thesourceofore formingmaterialshaslongbeenafocusofdiscussion .Studieso…
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| 关 键 词： | gold deposit source of 0re-forminE nmterial He，Ar isotopic composition mantle-branch structure mantle plume |
The isotopic composition of noble gases in gold deposits and the source of ore-forming materials in the region of North Hebei,China |
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| Wang?Baode,Niu?Shuyin,Sun?Aiqun,Li?Hongyang.The Isotopic Composition of Noble Gases in Gold Deposits and the Source of Ore- Forming Materials in the Region of North Hebei, China[J].Chinese Journal of Geochemistry,2003,22(4):313-319. |
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| Authors: | Wang Baode Niu Shuyin Sun Aiqun Li Hongyang |
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| Institution: | (1) Shijiazhuang University of Economies, 050031 Shijiazhuang, China |
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| Abstract: | The source of ore-forming materials has long been a controversial focus both in metallogenic theory and in ore-searching practice.
This study deals with the helium and argon isotopic characteristics of pyrites from 11 gold deposits and some country rocks
in the gold mineralizationconcentrated areas within the three mantle-branch structures in the region of North Hebei Province.
It is indicated that3He/4He ratios in the gold deposits are within the range of 0.93 × 10−6 –7.3 × 10−6, with an average of 3.55 × 10−6; R/Ra = 0.66−4.93, averaging 2.53;40Ar/39 Ar ratios vary between 426 and 2073, with the average value of40Ar being 8.32; and the average of4He/40 Ar ratios is 2.17.3He/4He ratios in gneiss and granite in the periphery of the mining district are within the range of 0.001 × 10−6–0.55 × 10−6, reflecting significant differences in their sources.3He and4He fall near the mantle, as is shown in the He concentration diagram. Studies have shown that the ore-forming materials in
this region should come from the deep interior of the Earth. With the multi-stage evolution of mantle plume, ore-forming fluids
in the deep interior were moving upwards to shallow levels (crust). Under such circumstances, there would be inevitably occur
crust/mantle fluid mixing, so their noble gas isotopic characteristics are intermediate between the mantle and the crust.
Funded jointly by the National Natural Science Foundation of China (No. 40272088), the Geological Surveying Project (No. 2000110100038),
and the Foundation for Back-bone Teachers at Higher Learning Schools (No. J-2000-25). |
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| Keywords: | gold deposit He Ar isotopic composition source of ore\|forming material mantle plume mantle\|branch structure North Hebei |
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