甘肃北山老君庙北金矿土壤地球化学特征及找矿前景

doi:10.11720/wtyht.2024.1342

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Abstract

Thenorthern Laojunmiao gold deposit is located in the southern zone of the Beishan area, Gansu Province, and on the northeastern margin of the Tarim block. It resides in a tectonic environment of the Yaodongliang-Xiaoxigong Paleoproterozoic rift basin. This study delineated five comprehensive anomaly zones in the area through a 1∶10,000 geochemical soil survey. As verified by trenching exploration, three gold ore bodies, one gold-silver ore body, and two low-grade gold ore bodies were identified in the comprehensive anomaly zones, suggesting satisfactory prospecting results. Based on the comprehensive geological and geochemical anomaly characteristics of the deposit, this study established an integrated geological-geochemical prospecting model centering on the HT1 comprehensive anomaly zone. Moreover, it proposed the subsequent prospecting direction, providing a significant reference for the deep and peripheral prospecting in the area.

Key words： northern Laojunmiao gold deposit soil geochemical characteristics prospecting model

Received: 07 August 2023 Published: 19 September 2024

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	Wen-Bin ZHANG
	Xian-Jun ZHOU
	Cui-Xia HOU
	Ning-Zu WANG
	Ping-Yuan SUN
	Zhen-Guan ZHAO
	Bi HE

Cite this article:

Wen-Bin ZHANG,Xian-Jun ZHOU,Cui-Xia HOU, et al. Geochemical characteristics of soils and prospecting potential of the northern Laojunmiao gold deposit in the Beishan area, Gansu Province[J]. Geophysical and Geochemical Exploration, 2024, 48(4): 945-953.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1342 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I4/945

3]
1—class Ⅰ metallogenic domain and code;2—class Ⅱ metallogenic province and code;3—class Ⅲ metallogenic zone and its code;4—class Ⅳ metallogenic subzone and code;5—Dunhuang (massif) gold-phosphorus-miscanthus metallogenic belt;6—Qiaowan-Xiqianluzi Caledonian-Varissian gold-iron-tungsten-lead-zinc-copper-potash mineralization subbelt;7—study area location
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Geotectonic location (a) and metallogenic belt division (b) of north Laojunmiao gold deposit in Beishan, Gansu Province^[3]
1—class Ⅰ metallogenic domain and code;2—class Ⅱ metallogenic province and code;3—class Ⅲ metallogenic zone and its code;4—class Ⅳ metallogenic subzone and code;5—Dunhuang (massif) gold-phosphorus-miscanthus metallogenic belt;6—Qiaowan-Xiqianluzi Caledonian-Varissian gold-iron-tungsten-lead-zinc-copper-potash mineralization subbelt;7—study area location

12]
1—Quaternary;2—D rock formation of Dunhuang rock group;3—C rock formation of Dunhuang rock group;4—B rock formation of Dunhuang rock group;5—A rock formation of Dunhuang rock group;6—monzogranite;7—dolomite diorite;8—potassium feldsparinite;9—quartz monzonite;10—quartz syenite;11—granite porphyry;12—diabase;13—thrust faults;14—translational faults;15—mylonite belt;16—gold deposits (points);17—study area location;18—1∶10,000 soil measurement range
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Regional geological map of north Laojunmiao gold deposit in Beishan,Gansu Province^[12]
1—Quaternary;2—D rock formation of Dunhuang rock group;3—C rock formation of Dunhuang rock group;4—B rock formation of Dunhuang rock group;5—A rock formation of Dunhuang rock group;6—monzogranite;7—dolomite diorite;8—potassium feldsparinite;9—quartz monzonite;10—quartz syenite;11—granite porphyry;12—diabase;13—thrust faults;14—translational faults;15—mylonite belt;16—gold deposits (points);17—study area location;18—1∶10,000 soil measurement range

8]
1—Quaternary;2—mafic plagioclase gneiss;3—nicolt plagioclase metagranulite;4—amphibole;5—milocite quartz schist;6—marble;7—quartzite;8—chlorite schist;9—dolomite quartz schist;10—quartz monzonite;11—quartz syenite;12—alteration zone;13—quartz veins;14—reverse faults;15—translational faults;16—faults of unknown nature;17—gold ore body;18—gold and silver ore bodies;19—comprehensive exception and number;20—soil profile and number
">

Geological map and comprehensive anomaly map of north Laojunmiao gold deposit^[8]
1—Quaternary;2—mafic plagioclase gneiss;3—nicolt plagioclase metagranulite;4—amphibole;5—milocite quartz schist;6—marble;7—quartzite;8—chlorite schist;9—dolomite quartz schist;10—quartz monzonite;11—quartz syenite;12—alteration zone;13—quartz veins;14—reverse faults;15—translational faults;16—faults of unknown nature;17—gold ore body;18—gold and silver ore bodies;19—comprehensive exception and number;20—soil profile and number

1∶10,000 soil survey geochemistry map of north Laojunmiao gold deposie

综合异常编号	面积/km²	元素组合	异常特征
HT1	0.22	Au-Ag-As-Sb	位于研究区西北部,异常呈NW向带状展布,长轴长920 m,短轴宽245 m,异常元素组合齐全,以Au、Ag、As、Sb、Pb、W、Mo、Bi为主,以Au、Ag、As、Sb异常套合好,浓集中心明显,Au、Ag、As发育三级浓度分带,异常峰值高,其中Au峰值为5 454.8×10^-9,Ag峰值为1.78×10^-6,As峰值为1 330×10^-6,Sb峰值为7.36×10^-6。异常区主要出露敦煌岩群B岩组大理岩、二云石英片岩,发育NWW向断裂构造(图5)
HT2	0.87	Au-Ag- As-Sb-Pb	位于研究区北部,呈NW向带状展布,长轴长1 760 m,短轴宽620 m,异常元素主要有Ag、Au、As、Sb、Pb、Zn、W,以Ag、Au、As、Sb、Pb套合最好,浓集中心明显,Au、Ag、As、Sb三级浓度分带明显,异常规模较大,其中Au峰值为366.9×10^-9,Ag峰值为16.56×10^-6,As峰值为2 491.8×10^-6,Sb峰值为60.15×10^-6。异常区主要出露敦煌岩群B岩组大理岩、二云石英片岩,硅化、褐铁矿化强烈,发育NW向展布的断裂构造(图6)
HT3	0.08	Au-Ag-As-Sb	位于研究区西部,呈椭圆状分布,异常元素主要有Au、Ag、As、Sb、Bi,其中Au、Ag、As、Sb套合极佳,异常浓集中心明显,异常强度高,Au峰值为323.4×10^-9,Ag峰值为1.55×10^-6,As峰值为4 022×10^-6,Sb峰值为9.87×10^-6。异常区主要出露敦煌岩群B岩组二云石英片岩、黑云斜长变粒岩、黑云斜长片麻岩,石英脉发育,异常与NW向展布的含石英脉蚀变黑云斜长变粒岩关系密切
HT4	0.04	Au-Mo-Bi	位于研究区西部,呈椭圆状分布,异常元素组合单一,主要有Au、Bi、Mo,规模较小,但异常套合好,浓集中心明显,且异常强度高,其中Au的峰值为1 097.5×10^-9
HT5	0.16	Au-Ag-Cu- Pb-Zn-W-Mo	位于研究区东部,呈NW向带状分布,向东未封闭。异常元素主要有Au、Ag、Cu、Pb、Zn、W、Mo,整体沿NW向展布,异常套合好,浓集中心明显,且异常强度高,其中Au峰值为130.2×10^-9、Ag峰值为2.62×10^-6、Cu峰值为359.2×10^-6、Pb峰值为338.3×10^-6。异常区主要出露敦煌岩群B岩组二云石英片岩、斜长角闪岩,地表见孔雀石化石英脉

Comprehensive abnormal feature statistics

HT1 anomaly analysis
1—milocite quartz schist;2—marble;3—quartzite;4—quartz monzonite;5—quartz syenite;6—faults of unknown nature;7—measured geological boundaries;8—synthesis of anomalies and numbers;9—gold ore bodyand numbers;10—trench and numbers;11—soil profile and numbers

HT2 anomaly analysis
1—quaternary;2—amphibole;3—milocite quartz schist;4—marble;5—quartzite;6—chlorite schist;7—dolomite quartz schist;8—alteration zone;9—granite veins;10—quartz veins;11—faults of unknown nature;12—measured geological boundaries;13—gold-silver ore bodyand numbers;14—synthesis of anomalies and numbers;15—trench and numbers

Horizontal zoning sequence parameters of PM04 profile

Geological-geochemical metallogenic elements and prospecting model of north Laojunmiao gold deposit

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