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浙江治岭头钼铅锌金多金属矿床矿质来源的硫、铅同位素示踪及成矿时代
投稿时间:2019-07-09  修订日期:2019-11-22  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020034
摘要点击次数: 52
全文下载次数: 58
作者单位E-mail
楚克磊 中国地质科学院 chukelei@163.com 
陈小荣 浙江省第七地质大队
浙江省第七地质大队 
 
齐刚 浙江省第七地质大队
浙江省第七地质大队 
 
高翔 浙江省第七地质大队
浙江省第七地质大队 
 
胡博 浙江省第七地质大队
浙江省第七地质大队 
 
中文摘要:治岭头矿床上部(火山岩盖层)以铅锌矿床、硫矿床为主,中间(变质岩基底)以金银矿、铅锌矿为主,深部(侵入岩体)以斑岩型钼矿床为主的“三层楼”模式。本文在前人研究的基础上,通过辉钼矿Re-Os同位素定年技术对治岭头矿床进行了成矿时代的厘定。6件辉钼矿样品的模式年龄为113.7~114.6 Ma,加权平均年龄为114.03±1.78 Ma,表明治岭头钼多金属矿床成矿作用发生于早白垩世晚期。该矿床辉钼矿样品的Re含量变化于16.05~66.29 μg/g,表明其成矿物质具有壳幔混源的特征。矿石硫同位素组成变化范围较窄(-2.1‰~2.6‰),达到同位素分馏平衡,说明硫具有相对均一的来源,可能主要来自上地幔或下地壳的深源岩浆,但也可能受到陆壳沉积物的混染。治岭头钼铅锌金多金属矿床矿石铅同位素组成变化范围比较小,208Pb/204Pb、207Pb/204Pb、206Pb/204Pb的范围分别为38.765~39.137、15.523~15.751、18.450~18.667,具有明显的壳幔混合特征。治岭头钼多金属矿床成矿年龄的厘定为下一步在区内开展同时期的斑岩成矿系统找矿勘探提供了重要的线索,同时为进一步深入研究中国东南沿海大陆边缘成矿带成岩成矿作用提供了新的资料和证据。
中文关键词:治岭头钼铅锌金多金属矿床  辉钼矿Re-Os定年  成矿物质来源  东南沿海成矿带
 
Sulfur and Lead Isotope Tracing for Sources of Ore-forming Material and Ore-forming Age of the Zhilingtou Mo-Pb-Zn-Au Polymetallic Deposit in Zhejiang Province
Author NameAffiliationE-mail
chu kelei Chinese Academy of Geological Sciences chukelei@163.com 
CHEN Xiaorong No. 7 Geological Party of Zhejiang Province  
QI Gang No. 7 Geological Party of Zhejiang Province  
gao xiang No. 7 Geological Party of Zhejiang Province  
hu bo No. 7 Geological Party of Zhejiang Province  
Abstract:The Zhilingtou deposit has a "three-story" mode, the upper (volcanic rock caprock) is dominated by lead-zinc deposits and sulfur deposits, the middle (metamorphic rock basement) is dominated by gold-silver and lead-zinc deposits, and the deep (intrusive rock) is dominated by porphyry molybdenum deposits. Based on the previous studies, this paper determined the ore-forming age of the Zhilingtou deposit through the molybdenite Re-Os isotope dating. The model age of the six molybdenite samples was 113.7~114.6 Ma, and the weighted average age was 114.03±1.78 Ma, indicating that the mineralization of the Zhilingtou Mo polymetallic deposit occurred in the late stages of the Early Cretaceous. The Re content of the molybdenum sample in this deposit changed from 16.05 to 66.29 μg/g, indicating that its ore-forming material has the characteristics of crust-mantle mixed source. The sulfur composition of sulphide has a narrow range of changes (-2.1‰~2.6‰), which reaches the equilibrium of isotope fractionation. It may be mainly from the deep magma of the upper mantle or the lower crust. It has a relatively uniform source of sulfur, but may also be affected by continental crust. The range of lead isotope composition of the ore minerals from Zhilingtou Mo-Pb-Zn-Au polymetallic deposit is relatively small. The values of 208Pb/204Pb, 207Pb/204Pb, and 206Pb/204Pb are 38.765~39.137, 15.523~15.751, 18.450~18.667, respectively, which has obvious crust-mantle mixing characteristics. The determination of the ore-forming age of the Zhilingtou Mo polymetallic deposit provides an important clue for the prospecting of contemporary porphyry ore-forming systems in the region, and also highlights new information and evidence for further studying on the petrogensis and metallogeny of the Southeast coastal metallogenic belt.
keywords:Zhilingtou Mo-Pb-Zn-Au polymetallic deposit  Molybdenite Re–Os dating  Sources of ore-forming materials  Southeast coastal metallogenic belt
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