地质学报2017，Vol.91Issue(9)：1942-1958,17.
藏北东窝东铜多金属矿床含矿斑岩年代学、Sr-Nd-Pb同位素及成矿预测
Geochronology and Sr-Nd-Pb Isotopic Geochemistry of Ore-bearing Porphyry in the Dongwodong Copper Polymetallic Deposit, North Tibet and Their Implications for Exploration Direction
摘要
Abstract
The Dongwodong copper polymetallic deposit is a newly discovered important prospect area, which is located in the southern margin of Qiangtang terrane, the western part of Bangong Co-Nujiang mineralization belt, near by the Duolong copper gold deposit cluster.In order to further analyze metallogenic geological conditions and prospecting potential of the Dongwodong deposit area, and based on the detail geological investigation and logging, this study carried out zircon chronology study of ore-bearing porphyry using ion probe (SHRIMP) and geochemical and Sr, Nd, Pb isotopic analysis using plasma mass spectrometer (ICP-MS).The results indicate that the ore-bearing porphyry crystallization age is ca.122Ma, suggesting it is the product of early Cretaceous metallogenic event in the Duolong deposit cluster.Sr, Nd, Pb isotopic analysis shows that initial Sr value ranges from 0.7052 to 0.7062, 143 Nd/144 Nd ratio from 0.512365 to 0.512409, eNd(t) from-4.05 to-3.88, 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb are18.691～18.823, 15.638～115.796, 38.649～38.924 respectively, revealing that the ore-bearing porphyry is characterized by a crust-mantle mixing source and may be the juvenile crust derived from subduction environment of Bannu Ocean.After the comprehensive analysis of geological situation, geophysical(1/10000 magnetic survey and induced polarization survey) and geochemical (1/10000 stream sediment survey) exploration data, it has been concluded that the Dongwodong deposit has a good metallogenic condition and prospecting potential.It is suggested that porphyry-epithermal copper polymetallic metallogenic system should be the direction for deposit exploration.关键词
SHRIMP锆石U-Pb年代学/Sr-Nd-Pb同位素/东窝东/班怒成矿带/西藏Key words
SHRIMP zircon U-Pb geochronology/Sr-Nd-Pb isotopic/Dongwodong/Bangong Co-Nujiang mineralization belt/Tibet引用本文复制引用
林彬,李彦波,杨欢欢,陈列,付燕刚,陈毓川,唐菊兴,宋扬,王勤,方向,刘治博,王艺云,冯军..藏北东窝东铜多金属矿床含矿斑岩年代学、Sr-Nd-Pb同位素及成矿预测[J].地质学报,2017,91(9):1942-1958,17.基金项目
本文为公益性行业科研专项(编号201511017) （编号201511017）
中国地质科学院基本业务费项目(编号YYWF 201608),国家自然科学基金项目(编号41402178) （编号YYWF 201608）
青藏专项地质调查项目(编号12120114050401) （编号12120114050401）
中铝资源西藏金龙矿业股份有限公司项目(编号XZJL-2013-JS03)资助成果. （编号XZJL-2013-JS03）
