岩屑地球化学测量在甘肃北山干旱戈壁荒漠区的找矿效果——以三白墩地区金砷矿的发现为例

doi:10.11720/wtyht.2022.1246

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Abstract

Based on the landscape characteristics of the arid Gobi desert in the Beishan area, Gansu Province, this study carried out a 1:50,000 stream sediment survey in the Sanbaidun area and delineated 10 integrated anomalies. Then, the As-3 anomaly was preferentially selected for detail inspection by taking lithic fragments with grain sizes of 2~20 mm at multiple locations within 1/3 line spacing using a grid density of 100 m × 20 m. As a result, three integrated anomalies of lithic fragments were delineated and their characteristics were investigated. The dominant ore-forming elements were identified as As and Au, and two integrated anomalies were preferentially selected for detailed inspection using methods such as geochemical profile and trenching. Consequently, four Au orebodies, two As orebodies, one Au mineralized body, and one As mineralized body were found. The prospecting results indicate that the geochemical survey of lithic fragments can achieve ideal prospecting effects in the arid Gobi desert landscape area of Beishan and that 1:10,000 surveys of lithic fragments can be used to verify the anomalies of 1:50,000 stream sediment surveys.

Key words： Beishan, Gansu Province arid Gobi desert geochemical cuttings survey of lithic fragments gold-arsenic deposit Sanbaidun area

Received: 04 May 2021 Published: 21 June 2022

ZTFLH:

P632

Corresponding Authors: CHEN Jie E-mail: 719252554@qq.com;491699357@qq.com

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	Zi-Qiang LEI
	Jie CHEN
	Shi-Ming CHEN
	Cheng-Hao FANG
	Zhen-Xi YANG
	WANG-Zhen

Cite this article:

Zi-Qiang LEI,Jie CHEN,Shi-Ming CHEN, et al. Application of geochemical survey of lithic fragments in ore prospecting in arid Gobi desert of the Beishan area, Gansu Province: A case study of the discovery of the gold-arsenic deposit in Sanbaidun area[J]. Geophysical and Geochemical Exploration, 2022, 46(3): 585-596.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1246 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I3/585

Ⅱ 2 1—Dunhuang stratigraphic division;

Ⅱ 22

—Luoyachushan-Liuyuan stratigraphic division;

Ⅲ 31

—Alxa stratigraphic division;

Ⅳ 41

—Zoulang stratigraphic division;

Ⅳ 42

—stratigraphic division of north Qilian;

Ⅳ 43

—stratigraphic division of middle Qilian;

Ⅳ 44

—stratigraphic division of south Qilian
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Regional geological map of Sanbaidun area
a—regional stratigraphic division; b—regional lithology distribution; c—regional geological map;1—Quaternary alluvium; 2—Quaternary eluvial and Deluvial deposits; 3—rock group B of Dunhuang rock group; 4—rock group C of Dunhuang rock group; 5—quartz diorite; 6—quartz monzonite diorite; 7—monzogranite; 8—granodiorite; 9—tonalite; 10—Archean granitic tonalite gneiss; 11—Paleoproterozoic middle and low-grade metamorphic rocks; 12—Carboniferous-Permian shallow marine clastic rock; 13—basic-ultrabasic rock; 14—Caledonian-Wallician quartz diorite and granite; 15—ductile shear zone and strong strain zone; 16—fault; 17—geological boundary; 18—gold deposit; 19—stratigraphic boundary; 20—stratigraphic boundary; 21—study area; Ⅱ—Tarim stratigraphic area;Ⅲ—North China stratigraphic area; Ⅳ—Kunlun -Qilian-Qinling stratigraphic area;

Ⅱ 21

—Dunhuang stratigraphic division;

Ⅱ 22

—Luoyachushan-Liuyuan stratigraphic division;

Ⅲ 31

—Alxa stratigraphic division;

Ⅳ 41

—Zoulang stratigraphic division;

Ⅳ 42

—stratigraphic division of north Qilian;

Ⅳ 43

—stratigraphic division of middle Qilian;

Ⅳ 44

—stratigraphic division of south Qilian

Comprehensive anomaly map of 1:50 000 stream sediment survey in Sanbaidun area
1—Quaternary system; 2—rock group B of Dunhuang rock group; 3—rock group C of Dunhuang rock group; 4—syenogranite; 5—quartz monzonite diorite; 6—quartz diorite;7—tonalite; 8—monzogranite; 9—granodiorite; 10—granite; 11—porphyritic granite; 12—porphyritic monzogranite; 13—monzonitic granitic mylonite; 14—measured normal fault; 15—measured right lateral translation fault; 16—faults of unknown nature; 17—mylonitization zone; 18—comprehensive abnormal location and number

Location map of Sanbaidun cuttings
1—Quaternary alluvium; 2—monzogranite; 3—granodiorite; 4—quartz schist; 5—amphibolite schist; 6—biotite plagioclase gneiss; 7—hornblende plagioclase gneiss; 8—sericite; 9—granite vein; 10—quartz vein; 11—rock cuttings sampling point; 12—sampling points of repeated rock cuttings

Analysis methods of rock cuttings samples

Statistics of rock debris anomaly lower limit in the study area

Characteristics of geochemical parameters in the study area

R-type cluster analysis pedigree of rock debris measment in Sanbaidun area

Orthogonal rotation factor load matrix

Orthogonal rotation factor load diagram

Comprehensive anomaly map of the study area
1—Quaternary alluvium; 2—monzogranite;3—granodiorite; 4—quartz schist; 5—amphibolite schist; 6—biotite plagioclase gneiss; 7—hornblende plagioclase gneiss; 8—quartzite; 9—granite vein; 10— quartz vein; 11—location and number of probe groove;12—geological boundary; 13—Au ore body and number; 14—As ore body and number; 15—comprehensive anomaly and number of 1 : 10 000 rock cuttings measurement

Analysis of Ay1 anomaly in 1:10 000 cuttings measurement
1—Quaternary alluvium; 2—biotite plagioclase gneiss; 3—hornblende plagioclase gneiss; 4—granite; 5—quartz vein; 6—1:10 000 rock cuttings measurement; 7—anomaly and number of Au measured by 1:10 000 rock cuttings; 8—extreme point of element; 9—Au abnormality; 10—As abnormality; 11—Sb abnormality; 12—Ag abnormality; 13—Cu abnormality; 14—W abnormality; 15—Pb abnormality; 16—Mo abnormality

Statistical table of abnormal characteristic parameters of Ay1 measured by 1:10 000 rock cuttings

Analysis of Ay3 anomaly in 1:10 000 cuttings measurement
1—Quaternary alluvium; 2—biotite plagioclase gneiss; 3—amphibolite schist; 4—quartz schist; 5—granite; 6—granodiorite; 7—monzogranite; 8—comprehensive abnormal position and number; 9—abnormal position and number of single element; 10—extreme point; 11—Au abnormality; 12—As abnormality; 13—Pb abnormality

Statistical table of abnormal characteristic parameters of Ay1 measured by 1:10 000 rock cuttings

Project deployment of Sanbaidun gold arsenic mine
1—Quaternary alluvium; 2—biotite plagioclase gneiss; 3—hornblende plagioclase gneiss; 4—granite; 5—quartz vein;6—gold ore body; 7—gold mineralized body; 8—arsenic ore body; 9—arsenic mineralized body; 10—location and number of probe groove

Macroscopic and microscopic characteristics of Sanbaidun gold deposit

Sketch of STC5 trench in Sanbaidun
1—Quaternary system; 2—hornblende plagioclase gneiss; 3—biotite plagioclase gneiss; 4—cataclastic rock; 5—granodiorite; 6—quartz vein; 7—fault; 8—occurrence; 9—spectrum; 10—sampling location and number of chemical samples

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