摘要
锆石SHRIMPU Pb年代学及全岩和含矿石英脉锶同位素组成研究表明 ,东天山三岔口铜矿区矿化斜长花岗斑岩的岩浆侵位年龄为 2 78± 4Ma(95 %可信度 ) ,即成岩成矿时代为早中二叠世 ;矿化斜长花岗斑岩、英云闪长 (玢 )岩及含矿石英脉的 (87Sr/ 86Sr) i 在测定误差内一致 ,介于 0 .70 370～ 0 .70 4 37之间 ,而计算得到的εSr(t)值变化于 - 8.5～ +2 .7之间。锶同位素组成特征表明 ,成矿岩体为典型的I型花岗岩 ,可能是幔源火山岩或上地幔物质部分熔融的产物。
Zircon SHRIMP U-Pb dating and strontium isotope analyses of granites and copper-bearing quartz veins show that the mineralized plagiogranite porphyry in the Sanchakou deposit of East Tianshan Mountains has an emplacement age of 278±4 Ma(95% Conf.),which means that the rock-forming and ore-forming event took place during early-middle Permian. The( 87 Sr/ 86 Sr)_ i values of mineralized plagiogranite porphyry,tonalite(porphyry)and copper-bearing quartz veins are consistent in test errors,ranging from 0.70370 to 0.70437,and the calculated ε_ Sr ( t )values vary from -8.5 to +2.7,showing that the mineralized intrusions are I-type granitoids and might have been derived from the upper mantle.
出处
《地球学报》
EI
CAS
CSCD
北大核心
2004年第2期191-195,共5页
Acta Geoscientica Sinica
基金
国家重点基础研究发展规划项目 (编号 :G19990 43 2 0 1和 2 0 0 1CB40 910 )
国家科技攻关计划"新疆优势矿产资源勘查综合研究"(编号 :2 0 0 1BA60 9A 0 7 18)资助
