福建将乐新路口钨矿是闽西北地区石英脉型钨矿的代表性矿床之一,然而对其成矿时代尚未开展过研究。为了了解新路口石英脉型钨矿床的成矿时代和矿石成份,对黑钨矿进行了电子探针成份分析和LA-ICPMS U-Pb测年,结果显示:黑钨矿WO3为74.147%...福建将乐新路口钨矿是闽西北地区石英脉型钨矿的代表性矿床之一,然而对其成矿时代尚未开展过研究。为了了解新路口石英脉型钨矿床的成矿时代和矿石成份,对黑钨矿进行了电子探针成份分析和LA-ICPMS U-Pb测年,结果显示:黑钨矿WO3为74.147%~75.491%,MnO的含量为9.601%~16.311%,FeO的含量为8.921%~14.903%;FeO/MnO平均值为0.784,总体富锰,属于钨锰铁矿;黑钨矿LA-ICP-MS U-Pb的T-W下交点年龄为147.0 ± 2.6 Ma (MSWD = 0.51),校正后的206Pb/238U加权平均年龄为145.2 ± 2.6 Ma (n = 21, MSWD = 1.6),成矿年龄为晚侏罗世。The Xinlukou tungsten deposit in Jiangle, Fujian Province is one of the representative deposits of quartz vein type tungsten deposits in northwestern Fujian, however, its metallogenic age has not been studied. In order to understand the metallogenic age and ore composition of the Xinlukou quartz vein type tungsten deposit, the electron microprobe composition analysis and LA-ICPMS U-Pb dating of wolframite were carried out. The results show that the content of WO3 is 74.147%~75.491%, the content of MnO is 9.601%~16.311%, and the content of FeO is 8.921%~14.903%. The average value of FeO/MnO is 0.784, which is rich in manganese and belongs to tungsten manganese iron ore. The LA-ICP-MS U-Pb T-W lower intercept age of the wolframite is 147.0 ± 2.6 Ma (MSWD = 0.51), the corrected 206Pb/238U weighted average age is 145.2 ± 2.6 Ma (n = 21, MSWD = 1.6), and the metallogenic age is Late Jurassic.展开更多
U-Pb dating was conducted on different domains of zircons from metamorphosed leucosomes in Delingha （ 德令哈） complex, the lower basement rocks of the Olongbuluke （欧龙布鲁克 ） microcontinent, North Qaidam, in or...U-Pb dating was conducted on different domains of zircons from metamorphosed leucosomes in Delingha （ 德令哈） complex, the lower basement rocks of the Olongbuluke （欧龙布鲁克 ） microcontinent, North Qaidam, in order to review its complex tectonothermal history. The zircon core is comprised of highly-modified magmatic zircon relicts, the zircon mantle was produced in response to anatexis of a Late Protoproterozoic thermal event; age and isotopic composition of both the zircon core and the zircon mantle have been seriously disturbed due to the thermal event related with growth of the zircon overgrowth rim. The 207 PIV 206 Pb apparent age of the overgrowth rim was estimated to be - 1 030 Ma. This Late Mesoproterozoic thermal event has been interpreted as a response to the global Rodinia supercontinent assembly event in the Olongbuluke microcontinent, Northwest China.展开更多
文摘福建将乐新路口钨矿是闽西北地区石英脉型钨矿的代表性矿床之一,然而对其成矿时代尚未开展过研究。为了了解新路口石英脉型钨矿床的成矿时代和矿石成份,对黑钨矿进行了电子探针成份分析和LA-ICPMS U-Pb测年,结果显示:黑钨矿WO3为74.147%~75.491%,MnO的含量为9.601%~16.311%,FeO的含量为8.921%~14.903%;FeO/MnO平均值为0.784,总体富锰,属于钨锰铁矿;黑钨矿LA-ICP-MS U-Pb的T-W下交点年龄为147.0 ± 2.6 Ma (MSWD = 0.51),校正后的206Pb/238U加权平均年龄为145.2 ± 2.6 Ma (n = 21, MSWD = 1.6),成矿年龄为晚侏罗世。The Xinlukou tungsten deposit in Jiangle, Fujian Province is one of the representative deposits of quartz vein type tungsten deposits in northwestern Fujian, however, its metallogenic age has not been studied. In order to understand the metallogenic age and ore composition of the Xinlukou quartz vein type tungsten deposit, the electron microprobe composition analysis and LA-ICPMS U-Pb dating of wolframite were carried out. The results show that the content of WO3 is 74.147%~75.491%, the content of MnO is 9.601%~16.311%, and the content of FeO is 8.921%~14.903%. The average value of FeO/MnO is 0.784, which is rich in manganese and belongs to tungsten manganese iron ore. The LA-ICP-MS U-Pb T-W lower intercept age of the wolframite is 147.0 ± 2.6 Ma (MSWD = 0.51), the corrected 206Pb/238U weighted average age is 145.2 ± 2.6 Ma (n = 21, MSWD = 1.6), and the metallogenic age is Late Jurassic.
基金The paper is supported by Key Project ( No .104039) and Special Doc-toral Project (No .20050491506) from the Ministry of Education , China ,the Open Research Program of the Key Laboratory of Continental Dynamics , Northwest University ,and NSFC Special Grant for National Education Base of Geology (No .J0530147) .
文摘U-Pb dating was conducted on different domains of zircons from metamorphosed leucosomes in Delingha （ 德令哈） complex, the lower basement rocks of the Olongbuluke （欧龙布鲁克 ） microcontinent, North Qaidam, in order to review its complex tectonothermal history. The zircon core is comprised of highly-modified magmatic zircon relicts, the zircon mantle was produced in response to anatexis of a Late Protoproterozoic thermal event; age and isotopic composition of both the zircon core and the zircon mantle have been seriously disturbed due to the thermal event related with growth of the zircon overgrowth rim. The 207 PIV 206 Pb apparent age of the overgrowth rim was estimated to be - 1 030 Ma. This Late Mesoproterozoic thermal event has been interpreted as a response to the global Rodinia supercontinent assembly event in the Olongbuluke microcontinent, Northwest China.
