新疆阿尔泰铁木尔特铅锌矿床稳定同位素组成特征.pdf

2010年12月
矿床地质
第29卷第6期
December, 2010
MINERAL DEPOSTTS
Vol. 29 No. 6
文章编号:0258-7106(2010)06-1088-13
新疆阿尔泰铁木尔特铅锌矿床稳定同位素组成特征
耿新霞,杨富全,杨建民1,郭正林2,郭旭吉2,黄承科2,刘锋
柴风梅3,张志欣1
(1中国地质科学院矿产资源研究所国士资源部成矿作用与资源评价重点实验室,北京100037
2新疆维吾尔自治区有色地勘局706地质队,新疆阿勒泰83600;3新疆大学地质与查工程学院,
新疆乌鲁木齐830046)
摘要新疆阿尔泰山南缘克兰盆地中的铁木尔特中型铅锌矿床赋存于上志留统一下泥盆统康布铁堡组上亚
组第二岩性段,容矿岩石为大理岩、録泥石英片岩、变钙质粉砂岩、砂卡岩。矿床经历了喷流沉积期、叠加改造期和
表生期。喷流沉积期硫化物δS值集中于-27.8%~-16.0%,峰值为~26.0%,少量1.7%~3.4%,表明硫主要
来自细菌还原海水硫酸盐及岩浆活动。氢、氧同位素组成表明,叠加改造期石英和方解石的8D变化于-122%
61%,8S0变化于9.5%~10.9%,88O水为-5.8%~4.8%,表明叠加改造期成矿流体具有多来源特征,是岩浆
水、大气降水和变质水的混合产物。铁木尔特铅锌矿床在成因类型上为VMS型,矿床形成后又经历了叠加改造。
关键词地球化学;铅锌矿;稳定同位素;成矿机制;铁木尔特;阿尔泰
中图分类号:P618.42;P618.43
文献标志码:A
Stable isotope characteristics of Tiemurte Pb-zn deposit in Altay, Xinjiang
GENG Xin Xia, YANG Fuquan YANG Jianmin, GUO Zhenglin?, UO Xw]?, HUANG Chengke?
LIU Feng, CHAI Fengmei'and ZHANG Zhixin
(1 MLR Key Laboratory of Metallogeny and Mineral Assesment Institue of Mineral Resources, Chinese Academy of Geological
cines, Beijing 100037, ha; 2 No. 7 local Pay, X j n Gxl n urea or Onerous Metals, Altay, Xin
j ang 839000 hina lle of y an rting ng P am Xi an Un i Omi 830046, Xin ang, Chin
bstract
Lying in Kelang basin on the southern margin of Altay, thetiemurte medium-size lead-zinc deposit occurs
in 2nd lithological member of Upper Silur an- Lower Devonian Kangbutiebao Formation, with the host rocks be
ing marble, chlorite quart schist, calcareous ar illaceous siltstone and skarn. The ore deposit has experienced
three evolutionary periods i.e., sedimentary exhalative period, superposed reforming period and hypergenic pe-
riod. The s values of the sedimentary exhalative period range mainly from.8% to -16.0% with the
peak value being -26.0% and a few values varying from 1. 7%o to 3. 4%o, suggesting that the ore-forming flu
id was mainly derived from the mixed fluid of meteoric water and magmatic water. In the sedimentary exhalative
period D values of quar z and calcite are from -122% to -61%o, O values change from 9.5%o to 10.9%
and Oo values vary from 5. 8% to.8%, implying that the ore- forming fluid was probably the mixture of
本文为国家重点基础研究发展计划项目(编号2007C3411302)、中央级公益性科研院所基本科研业务费专项资金项目(编号:KO924)、国
家科技支撑计划重点项目(编号:2006BABO7BO2-05;2006BABO7EBO7-02)、国土资源大调查项目(编号:12120107860060共同资助
第一作者简介耿新霞,女,1979年生,在读博土研究生,矿产普查与资源评价专业。Email:gengxinxia0536asina.com
收稿日期2010-01-10。改回日期2010-10-15。张錡玲编辑。