Geochronology and geochemistry of the ore-bearing porphyry in Qulong Cu(Mo)ore deposit,Tibet.
Geochronology and geochemistry of the ore-bearing porphyry in Qulong Cu(Mo)ore deposit,Tibet.
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发表时间：
2006
影响因子：
1.8
通讯作者：
W. Liang;Dong-sheng Guo
中科院分区：
文献类型：
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作者：
W. Liang;Dong-sheng Guo
青藏高原拉萨地块冈底斯斑岩铜矿存款带的发现及进一步研究，是近5年来西藏找矿工作中最引人注目的发现之一，具有成为一条巨型铜多金属成矿带的潜力，目前对该成矿带的研究仍在进行中。本文介绍了含矿花岗闪长岩的地球化学研究和同位素测年的新成果，并对成矿作用进行了讨论。在详细野外工作和地球化学研究的基础上，采用SHRIMP锆石U-Pb法和辉橄榄岩Re-Os定年法测定了成岩成矿年龄。两个锆石SHRIMP U-Pb年龄分析（16.35±0.40Ma和16.38±0.46Ma）和四个Re-Os模式年龄本文对驱龙存款矿ZK 003钻孔岩芯中15.82-16.85Ma的岩石年龄进行了测定，所得数据与已发表的数据非常接近，进一步支持了驱龙矿存款成岩成矿作用连续的结论，冈底斯斑岩铜矿存款带成矿时间为12 ~ 17 Ma，持续时间约为5 Ma。
The discovery and further study of the Gangdese porphyry copper ore deposit belt in Lhasa block,Tibetan plateau,is one of the most attractive findings in the ore exploration in Tibet in the past 5 years.It has potential of being a giant copper and polymetallic ore-forming belt in the future.Study on the belt is still under going now.Qulong porphyry Cu(Mo)ore deposit is located in eastern part of the belt and only a small amount works has been performed.This mostly attributes to its inconvenient condition for field work in Qulong region.New geochemical studies and isotopic dating results on the ore-beating granodiorites were presented in this paper. On the basis of detailed field work and geochemical study,SHRIMP zircon U-Pb method and Re-Os dating of molybdenites method were used for determining the rock-forming and ore-forming ages.Analysis of two SHRIMP zircon U-Pb ages(16.35±0.40Ma and 16.38±0.46Ma)and four Re-Os model age of molybdenites(15.82-16.85Ma)sampled in the drilling core of ZK003 in Qulong ore deposit were carried out.Data in this paper are very close to the other published data,further supporting the conclusion that the rock- forming and ore-forming processes are continuously in Qulong ore deposit,which lasting for a short period of less than approximately 1Ma.The time for ore-forming in Gangdese porphyry copper ore deposit belt range from 12 to 17Ma,lasting for about 5Ma.