中国地质2013，Vol.40Issue(4)：1189-1201,13.
桂东北越城岭—苗儿山地区印支期成矿作用:油麻岭和界牌矿区成矿花岗岩锆石U-Pb年龄和Hf同位素制约
Indosinian metallogentic activity in Yuechengling-Miaoershan area,northeastern Guangxi:implications from zircon U-Pb ages and Hf isotopic constraint on ore-forming granites in Youmaling and Jiepai deposits
摘要
Abstract
Youmaling and Jiepai are two newly-discovered tungsten-tin polymetallic deposits with middle-scale metal resources.Their main ore bodies occur in skarn and fractured rocks adjacent to the fine to medium gained monzogranite contacts.In this paper,in situ LA-MC-ICP-MS technology was employed to measure the U-Th-Pb and Hf isotopes of these granites from inner contacts of the Youmaling and Jiepai deposits.Zircon U-Pb isotopic results show that the granites were formed at Ca.220±1 Ma (MSWD=0.035) and 215±1 Ma (MSWD=0.055) respetively,indicating that Indosinian metallogentic activity took place in Yuechengling-Miaoershan area.e Hf (t) values of granite from Youmaling vary between-2.47 and-6.67,and those from Jiepai vary between-3.52 and-6.79,suggesting that they were both remelted from crust rocks.In contrast to other tungsten mineralized granites in the Nanling Mountains,the sources of two granites have higher εHf (t) values.A appropriate reason is that some Neoproterozoic island arc materials with positive ε Hf (t) values were involved during the remelting of the source materials.Isotopic ages from this paper and previous work indicate that intense Indosinian petrogenetic and metallogentic activities took place in this area.As we all know,fruitful exploration achievements have been obtained in the vicinity of contacts of Indosinian granites in the Nanling Mountains,so more attention must be paid to the exploration and evaluation in this area in the next few years.关键词
印支期/成矿花岗岩/LA-MC-ICP-MS/锆石U-Pb年龄/Hf同位素/桂东北Key words
Indosinian/ ore-forming granite/ LA-MC-ICP-MS/ zircon U-Pb ages/ Hf isotope/ northeastern Guangxi引用本文复制引用
程顺波,付建明,马丽艳,蒋桂新,陈希清,卢友月,童喜润..桂东北越城岭—苗儿山地区印支期成矿作用:油麻岭和界牌矿区成矿花岗岩锆石U-Pb年龄和Hf同位素制约[J].中国地质,2013,40(4):1189-1201,13.基金项目
中国地质调查局地质大调查项目(1212010981028和1212011120804)资助. （1212010981028和1212011120804）
