东昆仑地区打柴沟金矿地球物理特征及深部找矿预测

doi:10.11720/wtyht.2024.1126

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摘要

东昆仑成矿带是我国重要的金属矿成矿带,分布有大量造山型金矿床,其中较大规模的有昆仑河、沟里和五龙沟金矿集区。打柴沟是五龙沟金矿田近年来新发现的大型金矿床,有较大的成矿潜力,但是矿带向西延展情况不明,为此开展了激电和广域电磁法测深工作。研究表明,已知矿带位于区域重力异常梯级带、正负弱磁异常过渡区域,在激电异常上位于激电异常边部或电性梯度带位置,区域构造带发育区位于大面积激电异常区段;区域构造带表现为大范围的低阻异常带,已知矿带Ⅳ号蚀变带异常表现为低阻异常带开口位置,Ⅲ号蚀变带位于浅部电性异常梯度带。基于上述认识和西延段几条平行剖面的电磁法异常变化规律,推断区域控矿构造向W-NWW向延伸稳定,在矿区西延段形成有利的找矿空间。在打柴沟矿区开展的深部物探工作成果显示,地球物理方法在深部地质找矿研究工作中具有明显优势,为东昆仑金矿区深部找矿提供了成功经验。

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关键词 ：地球物理, 金矿, 深部找矿, 东昆仑, 打柴沟

Abstract：

The eastern Kunlun metallogenic belt, as a significant metal metallogenic belt in China, hosts extensive orogenic gold deposits and large-scale Kunlunhe, Gouli, and Wulonggou gold concentration areas. The Dachaigou gold deposit is a large-scale gold deposit newly discovered in the Wulonggou gold field in recent years. Despite its high metallogenic potential, the western extension of its ore belt has not been defined. Hence, this study conducted induced polarization (IP) sounding and wide-field electromagnetic sounding in the deposit. The results show that the known ore belt is situated in the regional gravity anomaly gradient zone, the transition zone of positive and negative weak magnetic anomalies, the edge of IP anomalies, or the electrical gradient zone. The development zone of the regional tectonic belt resides in the large-scale IP anomaly section. The regional tectonic belt is characterized by a wide range of low-resistivity anomaly zones. The IV and III alteration zones of the known ore belt are located in the opening position of the low-resistivity anomaly zone and the shallow electrical anomaly gradient zone, respectively. Based on the above understanding and the electromagnetic anomaly change patterns of several parallel profiles in the western extension segment, it was inferred that the regional ore-controlling structure extends steadily in the W-NWW direction, forming a favorable prospecting space in the western extension segment of the deposit. The results of deep geophysical exploration in the Dachaigou deposit indicate that geophysical methods manifest significant advantages in deep geological prospecting research, providing successful experience for deep prospecting in the eastern Kunlun gold deposit area.

Key words： geophysics gold deposit deep prospecting eastern Kunlun Dachaigou

收稿日期: 2023-03-22 修回日期: 2023-09-27 出版日期: 2024-02-20

ZTFLH:

P631

基金资助:青海省地质勘查基金项目(2017042014ky014);青海学者专项(QHS201802);青海省地矿局高层次人才培养项目(青地矿科[2021]61号)

通讯作者: 严玲琴(1983-),女,青海西宁市人,高级工程师,工学硕士,主要从事地质矿产勘查和产业研究工作。Email:45061885@qq.com

作者简介: 喻忠鸿(1983-),男,四川内江市人,高级工程师,工学硕士,主要从事地球物理勘查应用研究工作。Email:piscesfish@163.com

引用本文:

喻忠鸿, 严玲琴, 张占雄, 李鹏, 李凤廷, 付佳. 东昆仑地区打柴沟金矿地球物理特征及深部找矿预测[J]. 物探与化探, 2024, 48(1): 40-47.
YU Zhong-Hong, YAN Ling-Qin, ZHANG Zhan-Xiong, LI Peng, LI Feng-Ting, FU Jia. Geophysical characteristics and deep prospecting prediction of the Dachaigou gold deposit in the eastern Kunlun area. Geophysical and Geochemical Exploration, 2024, 48(1): 40-47.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2024.1126 或 https://www.wutanyuhuatan.com/CN/Y2024/V48/I1/40

Fig.1 五龙沟金矿田地质(据文献[16]修改)
1—第四纪冲洪积物;2—新元古代丘吉东沟组;3—中元古代长城纪小庙组;4—古元古代金水口岩群;5—晚三叠世钾长花岗岩;6—早华力西期黑云母二长花岗岩;7—早华力西期蚀变斜长花岗岩;8—早加里东期黑云花岗闪长岩;9—新元古代黑云花岗闪长岩;10—新元古代含暗色包体花岗岩;11—新元古代石英闪长岩;12—基性岩脉;13—黑云母花岗岩脉;14—地质界线;15—走滑断层;16—实测正断层;17—推测逆断层;18—韧性剪切带;19—金矿床(点);20—多金属矿点;21—含金蚀变带及编号;22—矿区位置

Fig.2 打柴沟区域剩余重力异常

Fig.3 打柴沟矿区1∶5万地磁ΔT异常剖面平面

Fig.4 打柴沟矿区地质及物探工作布置
1—全新统洪冲积;2—更新统洪冲积;3—金水口岩群绢云石英片岩;4—金水口岩群灰岩;5—金水口岩群片岩夹变砂岩夹片麻岩;6—金水口岩群灰黑色黑云斜长片麻岩;7—金水口岩群大理岩;8—金水口岩群灰黑色斜长角闪片麻岩;9—正长花岗岩;10—二长花岗岩;11—花岗闪长岩;12—花岗岩;13—闪长岩;14—断裂;15—矿带及编号;16—物探剖面及编号;17—打柴沟矿区

Table 1 打柴沟矿区电物性参数

Fig.5 打柴沟矿区地质—视电阻率综合成果
1—全新统洪冲积;2—更新统洪冲积;3—金水口岩群绢云石英片岩;4—金水口岩群灰岩;5—金水口岩群片岩夹变砂岩夹片麻岩;6—金水口岩群灰黑色黑云斜长片麻岩;7—金水口岩群大理岩;8—金水口岩群灰黑色斜长角闪片麻岩;9—正长花岗岩;10—二长花岗岩;11—花岗闪长岩;12—花岗岩;13—闪长岩;14—断裂;15—矿带及编号;16—推断构造;17—打柴沟矿区

Fig.6 打柴沟矿区地质—视极化率综合成果
1—全新统洪冲积;2—更新统洪冲积;3—金水口岩群绢云石英片岩;4—金水口岩群灰岩;5—金水口岩群片岩夹变砂岩夹片麻岩;6—金水口岩群灰黑色黑云斜长片麻岩;7—金水口岩群大理岩;8—金水口岩群灰黑色斜长角闪片麻岩;9—正长花岗岩;10—二长花岗岩;11—花岗闪长岩;12—花岗岩;13—闪长岩;14—断裂;15—矿带及编号;16—推断构造;17—打柴沟矿区

Fig.7 打柴沟8勘探线地质—WFEM反演成果
1—矿带;2—矿体\矿化体;3—炭质层;4—钻孔

Fig.8 打柴沟矿区广域电磁法反演结果三维展示

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