摘要
详细的野外地质调查和系统的室内研究 ,揭示了石英闪长斑岩是沙溪斑岩铜 (金 )矿床的含矿岩体。其成因、演化和分布明显受郯庐深断裂控制。矿物学研究证明石英闪长斑岩中暗色矿物富Mg、Ti,贫Fe。全岩的主要元素、微量元素和稀土元素表明石英闪长斑岩中富碱、富钠、富轻稀土 ,铕异常不明显。8个全岩Rb -Sr同位素等时线年龄值为 (12 7.9± 1.6 )Ma ,属于燕山晚期产物 ;(87Sr/ 86Sr)i为 0 .70 5 8,说明成岩物质主要来自上地幔 。
Detailed field geology, mineralogy,petrology and geochemistry investigations have been made on the quartz diorite porphyry in Shaxi porphyry copper(gold) deposit,Investigation results have shown that the quartz diorite porphyry is the main ore-bearing stock of this deposit and its distribution, evolution and genesis are controlled obviously by the Tancheng-Lujiang deep fault. Mafic minerals of stock are rich in magnesium, titanium,but poor in iron.Chemically, the quartz diorite porphyry is rich in alkali,sodium and LREE and lack of obvious europium negative anomaly. Rb-Sr isochron age of the stock is (127.9±1.6)Ma and ( 87 Sr/ 86 Sr)i ratio equals 0.7058, these data suggest that the quartz diorite porphyry was formed during late Yanshanian and the rockforming materials were originated from upper mantle, but has been contaminated by crustal materials during its ascent process.
出处
《地质与勘探》
CAS
CSCD
北大核心
2000年第4期36-40,共5页
Geology and Exploration
基金
国家自然科学基金!(49472 110 )
地矿部 95 0 110 2 -0 4-0 1项目资助
关键词
石英闪长斑岩
地质地球化学
铜矿床
金矿床
porphyry Cu(Au)deposit
quartz diorite porphyry
geological and geochemical
Anhui Province
