Study on Mineralization Age of Xiaoban Gold Deposit, Fujian Province

作     者：Chen Bailin Institute of Geomechanics, CAGS, Beijing 100081 Wu Ganguo Faculty of Earth Sciences and Mineral Resources, China University of Geosciences, Beijing 100083 Zhang Da Institute of Geomechanics, CAGS, Beijing 100081 Huang Rensheng West Fujian Geological Party of FBGMRE, Sanming 365000 Wu Jianshe Fujian Bureau of Geological and Mineral Resources Exploration, Fuzhou 350003 

作者机构：Institute of Geomechanics CAGS Beijing 100081 Faculty of Earth Sciences and Mineral Resources China University of Geosciences Beijing 100083 West Fujian Geological Party of FBGMRE Sanming 365000 Fujian Bureau of Geological and Mineral Resources Exploration Fuzhou 350003 

出 版 物：《Journal of China University of Geosciences》 (中国地质大学学报（英文版）)

年 卷 期：2002年第13卷第3期

页      面：225-233页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：ThispaperisfinanciallysupportedbytheScienceandTechnologyProspectingProjectofNationPlanningCommission (JGG 9471 90 9)andGeologicalSurveyProjectofANewCircleSurveyingonLandandMaterialResourcesofChinaGeo logicalSurvey (1 9991 0 2 0 1 1 0 0 0 3) 

主　　题：mineralization age early yanshanian epoch xiaoban gold deposit fujian 

摘      要：The Xiaoban gold deposit is a large-size deposit recently found in middlearea of Fujian Province. It belongs to magmatic hydrothermal type occurred in Mayuan Groupmetamorphic rocks of Middle Proterozoic and is controlled by low angle fault (detachment)structures. The contents of Au in Mayuan Group metamorphic rocks, Caledonian-Indosinian deformedgranite and early Yanshanian granite are higher with Au enrichment coefficient of 2. 06-5.68, 5.11and 6.67 than those in other geological bodies. And the higher enrichment coefficients (2) of Ag,S, Sn and Te are similar to those of gold ore. Meanwhile, the distribution of Au in Mayuan Groupmetamorphic rocks and early Yanshanian granite with a low D-value (0.58 and 0.67) is favorable togold mineralization. REE characteristics of gold ore, ratios of (LREE/HREE), (La/Sm)_n, (Yb/Lu)_n,(La/Tb)_n and (Sm/Nd)_n are similar to Mayuan Group metamorphic rocks, only non or little normal Euabnormal of ore is dissimilar to metamorphic rocks. The δ(^(34)S) of the gold ore, with a highhomogenization, is (-4.7X10^(-3) - (-2.7X 10^(-3)). The study of inclusion indicates 180-249℃ ofmineralization temperature, 3. 69 %-11. 81 % of salinities and 0. 869-0.991 g/cm^3 of densities ofmineralization fluid. Based on hydrogen and oxygen isotope (δ(^(18)O) = 11. 0 X 10^(-3) -11.7 X10^(-3), δ(D) = (-48 X 10^(-3)) - (-62 X 10^(-3))) and initial w(^(87)Sr)/w(^(86)Sr) =0. 715,combining to the analysis of geological history, regional metamorphism and magamtic activity, theauthors confirm that the source for the ore fluid was mainly from magmatic, partly from metamorphicwater, and with a little influence of meteoric water. Isotopic dating made on Rb-Sr isochron age of182 Ma, by using alteration minerals of gold-ores from the deposit, indicates that themineralization occurs in early Yanshanian epoch. This is close to the age of 187 Ma of the Anchunmagmatite with a similar alteration and gold mineralization to the Xiaoban gold deposit. The age ofearly Yanshan