矿床地质2017，Vol.36Issue(4)：893-904,12.DOI:10.16111/j.0258-7106.2017.04.007
内蒙古东北部得耳布尔铅锌银矿床闪锌矿Rb-Sr年龄及地质意义
Rb-Sr isochron age of De'rbur Pb-Zn-Ag deposit in Erguna massif of northeast Inner Mongolia and its geological significance
摘要
Abstract
The De'rbur Pb-Zn-Ag deposit is located in the middle of the Erguna massif,northeast Inner Mongolia.Brecciated and massive ores,especially sphalerite and galena coarse aggregations,constitute the main ore structures in the deposit.Eight integral sphalerite samples were chosen to conduct further Rb-Sr isotopic analysis after petrographic observitions under microscope.The results show good linear relationship between 87Rb/86Sr and 87Sr/86Sr,being in the range of 0.0824～8.957 and 0.712 902～0.730 753,respectively.An isochron age of (144 ± 13) Ma from all eight samples was obtained,and further result of (141.6 ± 1.9) Ma (MSWD=1.8) was obtained after elimination of two deviated samples.The De'rbuer Pb-Zn-Ag deposit was formed in Early Cretaceous by this study,in agreement with the achivements on the Pb-Zn-Ag deposits in the Erguna massif by previous researchers.The Mongol-Okhotsk orogenic process in the E'rguna massif affected the Mesozoic mineralization,and the late-orogenic stage triggered Late Jurassic to Early Cretaceous hypabyssal magmatic intrusions in the region.The deposition of ore-forming materials in the De'rbur deposit was related to the comprehensive magmatic intrusion activities in the region.关键词
地球化学/闪锌矿/Rb-Sr同位素年龄/地质意义/得耳布尔铅锌银矿床/额尔古纳Key words
geochemistry/sphalerite/Rb-Sr isotopic age/geological significance/De'rbur Pb-Zn-Ag deposit/Erguna massif分类
天文与地球科学引用本文复制引用
赵岩,吕骏超,张德宝,周永恒,邵军,王冰..内蒙古东北部得耳布尔铅锌银矿床闪锌矿Rb-Sr年龄及地质意义[J].矿床地质,2017,36(4):893-904,12.基金项目
本文受到国家自然科学基金青年基金(编号:41501093)和中国地质调查项目(编号:DD20160346、201311018-03)联合资助 （编号:41501093）
