佟匡胤 1革晓东 2郭继海 3唐辉 3秦克章 4宋国学5
作者信息
- 1. 察哈尔右翼前旗博海矿业有限公司,内蒙古 乌兰察布 013764||黑龙江宝山矿业有限公司,黑龙江 黑河 164343
- 2. 长庆油田分公司技术监测中心,陕西 西安 710021
- 3. 黑龙江宝山矿业有限公司,黑龙江 黑河 164343
- 4. 中国科学院地质与地球物理研究所,北京 100029
- 5. 中国科学院大学地球与行星科学学院,北京 100049
- 折叠
摘要
Abstract
The Lesser Xing'an Range region,situated in the eastern segment of the Central Asian-Xingmeng Orogenic Belt,occupies a superimposed domain of three paleoplates:the Siberian,North China,and Pacific Plates.As a significant molybdenum metallogenic belt in Northeast China,this area is characterized by 200～170 Ma Mo deposits.Recent studies on the Wudaogou Mo deposit in the northern margin of the Lesser Xing'an Range have,for the first time,identified Permian Mo mineralization through magmatic geochronology,establishing this deposit as a critical target for investigating Permian Mo metallogenesis,ore-forming settings,and host-rock petrology in the region.This work conducted detailed field and indoor geological investigations of the Wudaogou molybdenum deposit in the northern margin of the Lesser Xing'an Range.The basic characteristics of the deposit,including common hydrothermal alteration mineral assemblages,ore mineral assemblages,and mineralization types in the area were determined.Based on these findings,geochronological studies were carried out,yielding a Re-Os isotopic age of 170.4±1.3 Ma for molybdenite from the Wudaogou deposit,a zircon U-Pb age of 186.8±0.81 Ma for coarse-grained alkali feldspar granite,and detrital ages of 371～690 Ma for siltstone,with the age lower limit constrained to the Late Devonian.This study reveals that:(1)The molybdenum mineralization in the deposit occurred during the Middle Jurassic(～170 Ma),rather than the Permian,which is consistent with the timing of major molybdenum deposits in the Lesser Xing'an Range.(2)The alkali feldspar granite in the mining area serves as the ore-hosting wall rock for the molybdenum orebodies,and its formation age predates the mineralization significantly.(3)The Wudaogou molybdenum deposit is a porphyry-type deposit,with a potential deep-seated porphyry mineralization system.(4)From the Paleozoic to the Early Mesozoic,the Wudaogou area developed a relatively continuous series of sedimentary rocks and intermediate-acidic magmatic rocks,which corresponded to the tectonic settings of subduction,collision,and post-orogenic extension related to the Nenjiang-Heihe Ocean.The Early-Middle Jurassic magmatic rocks and the associated Wudaogou molybdenum deposit were formed in a tectonic setting related to the subduction of the Paleo-Pacific Plate.关键词
小兴安岭/五道沟钼矿/斑岩成矿系统/早中侏罗世/中酸性岩浆岩/古太平洋板块Key words
Lesser Xing'an Range/Wudaogou molybdenum deposit/porphyry mineralization system/Early-Middle Jurassic/intermediate-acidic magmatic rocks/Paleo-Pacific Plate分类
天文与地球科学
