摘要
本文通过对都龙锡锌多金属矿床的铅、锶、硫同位素地球化学特征的系统研究 ,揭示该矿床成矿物质具有多来源的特点 :成矿金属主要来源于基底前寒武系变质岩和老君山花岗岩 ;硫主要来源于中寒武世热水沉积期还原的海水硫酸盐和深部岩浆房 ,同时 ,燕山期老君山花岗岩为后期叠加成矿作用提供了硫源 ,变质围岩也提供了一部分成矿物质。矿石中单矿物的铷 -锶等时线年龄为 (76 .7± 3.3)× 10 6a ,反映矿床明显受到燕山晚期岩浆热液作用的叠加。
Isotopic characteristics of the Dulong Sn\|Zn polymetallic deposit suggested that there should be several sources of its ore\|forming material. Ore\|forming metals may be mostly derived from pre\|Cambrian metamorphic rocks and Laojunshan granite. Ore\|forming sulfur may stem chiefly from seawater sulfate and Laojunshan granite. Regional metamorphism also offered some ore\|forming material. The Rb\|Sr isochron age indicated that this deposit had been superimposed by magmatic hydrothermalism in the late stage of the Yanshanian period.\;IsotopiccharacteristicsoftheDulongSn Znpolymetallicdepositsuggestedthatthereshouldbeseveralsourcesofitso
出处
《地质地球化学》
CSCD
北大核心
2000年第4期75-82,共8页
Geology-Geochemistry
基金
国家自然科学基金重点项目! (批准号 :4963 3 110 )
"攀登计划"项目 !(编号 :A3 0 -15 )
中关村地区联合测试基金 (批准号 :96K5 1
关键词
锡锌多金属矿床
同位素地球化学
成矿物质
来源
Sn\|Zn polymetallic deposit
isotope geochemistry
source of ore\|forming material
Dulong
Yunnan
