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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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

Received: 22 March 2023 Published: 26 February 2024

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	Zhong-Hong YU
	Ling-Qin YAN
	Zhan-Xiong ZHANG
	Peng LI
	Feng-Ting LI
	Jia FU

Cite this article:

Zhong-Hong YU,Ling-Qin YAN,Zhan-Xiong ZHANG, et al. Geophysical characteristics and deep prospecting prediction of the Dachaigou gold deposit in the eastern Kunlun area[J]. Geophysical and Geochemical Exploration, 2024, 48(1): 40-47.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1126 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I1/40

16])
1—Quaternary alluvial proluvial; 2—Neoproterozoic Qiujidonggou formation; 3—Mesoproterozoic Changcheng Xiaomiao formation; 4—Paleoproterozoic Jinshuikou group; 5—late Triassic K-feldspar granite; 6—early Variscan biotite monzogranite; 7—early Variscan altered plagioclase granite; 8—early Caledonian biotite granodiorite; 9—Neoproterozoic biotite granodiorite; 10—Neoproterozoic dark enclave bearing granite; 11—Neoproterozoic quartz diorite; 12—basic dyke; 13—biotite granite veins; 14—geological boundary; 15—strike slip fault; 16— measured normal fault; 17—inferred reverse fault; 18—ductile shear zone; 19—gold deposit (occurrence); 20—polymetallic occurrences; 21—gold bearing alteration zone and its number; 22—mine location
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Geological sketch of Wulonggou gold field(modified by reference [16])
1—Quaternary alluvial proluvial; 2—Neoproterozoic Qiujidonggou formation; 3—Mesoproterozoic Changcheng Xiaomiao formation; 4—Paleoproterozoic Jinshuikou group; 5—late Triassic K-feldspar granite; 6—early Variscan biotite monzogranite; 7—early Variscan altered plagioclase granite; 8—early Caledonian biotite granodiorite; 9—Neoproterozoic biotite granodiorite; 10—Neoproterozoic dark enclave bearing granite; 11—Neoproterozoic quartz diorite; 12—basic dyke; 13—biotite granite veins; 14—geological boundary; 15—strike slip fault; 16— measured normal fault; 17—inferred reverse fault; 18—ductile shear zone; 19—gold deposit (occurrence); 20—polymetallic occurrences; 21—gold bearing alteration zone and its number; 22—mine location

Regional residual gravity anomaly in Dachaigou mining area

Section plan of 1∶50 000 ΔT geomagnetism anomaly in Dachaigou mining area

Geological and geophysical exploration layout of Dachaigou mining area
1—Holocene alluvial sediments; 2—Pleistocene alluvial sediments; 3—sericite quartz schist of Jinshuikou group; 4—limestone of Jinshuikou group; 5—schist interbedded with metamorphic sandstone interbedded with gneiss of Jinshuikou group; 6—gray black biotite plagioclase gneiss of Jinshuikou group; 7—marble of Jinshuikou group; 8—grayish black amphibolite gneiss of Jinshuikou group; 9—syenogranite; 10—monzogranite; 11—granodiorite; 12—granite; 13—diorite; 14—fracture; 15—ore belt and number; 16—geophysical profile; 17—Dachaigou mine

Statistical table of electrical and physical parameters in Dachaigou mining area

Comprehensive results of geological and apparent resistivity in Dachaigou mining area
1—Holocene alluvial sediments; 2—Pleistocene alluvial sediments; 3—sericite quartz schist of Jinshuikou group; 4—limestone of Jinshuikou group; 5—schist interbedded with metamorphic sandstone interbedded with gneiss of Jinshuikou group; 6—gray black biotite plagioclase gneiss of Jinshuikou group; 7—marble of Jinshuikou group; 8—grayish black amphibolite gneiss of Jinshuikou group; 9—syenogranite; 10—monzogranite; 11—granodiorite; 12—granite; 13—diorite; 14—fracture; 15—ore belts; 16—inferred structure; 17—Dachaigou mine.

Comprehensive results of geological and apparent polarizability in Dachaigou mining area
1—Holocene alluvial sediments; 2—Pleistocene alluvial sediments; 3—sericite quartz schist of Jinshuikou group; 4—limestone of Jinshuikou group; 5—schist interbedded with metamorphic sandstone interbedded with gneiss of Jinshuikou group; 6—gray black biotite plagioclase gneiss of Jinshuikou group; 7—marble of Jinshuikou group; 8—grayish black amphibolite gneiss of Jinshuikou group; 9—syenogranite; 10—monzogranite; 11—granodiorite; 12—granite; 13—diorite; 14—fracture; 15—ore belt and number; 16—inferred structure; 17—Dachaigou mine

Geological and WFEM inversion results of Dachaigou line 8

Three-dimensional display of WFEM inversion results in Dachaigou mining area

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