构造地球化学岩屑测量在甘肃党河南山地区找金中的应用

doi:10.11720/wtyht.2021.0098

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Abstract

Danghe Nanshan is one of the important gold metallogenic areas in Gansu Province. A number of important gold deposits have been discovered there, such as Jiagongtai, Heicigou and Langchagou, suggesting that the metallogenic conditions are very favorable. However, due to the special geochemical landscape of this area, the peripheral prospecting effect is not good. When carrying out the 1:50 000 mineral prospect survey project in Heidaban-Danghe Nanshan area and aiming at the low and gentle anomalies in the area, the authors introduced the 1:10 000 tectono-geochemical debris survey method into the gold prospecting work for the first time, and analyzed the geochemical characteristics and element combination characteristics in this area. Combined with the metallogenic geological background, 13 comprehensive geochemical anomalies were delineated, and it was found that the main metallogenic elements Au, Pb and Pb and exploration elements As and Sb are intensively enriched in favorable structural positions. Through trenching, 6 new gold mineralization zones were discovered and 15 gold orebodies were delineated. This method was further applied to the gold prospecting in adjacent areas, with good prospecting results achieved. The successful application of this method is of great significance for prospecting in the geochemical landscape area of shallow covered Alpine desert.

Key words： cuttings survey tectonic geochemistry Danghe Nanshan gold deposit shallow overburden area alpine desert quick-stone area

Received: 24 February 2021 Published: 20 August 2021

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	Ji-Chang ZHAO
	Ying FAN
	Yi-Lan LEI
	Bin-Bin YAO

Cite this article:

Ji-Chang ZHAO,Ying FAN,Yi-Lan LEI, et al. The application of tectonogeochemical cuttings survey to gold prospecting in Nanshan area of Danghe, Gansu Province[J]. Geophysical and Geochemical Exploration, 2021, 45(4): 923-932.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.0098 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I4/923

Regional geological map of the study area
a—geotectonic location of the study area;b—the outcrop of the study area;1—Quaternary modern glaciers;2—Quaternary alluvial proluvial;3—Paleogene Baiyanghe formation;4—Triassic Junzihe Group;5—Permian Nuoyinhe Group;6—Carboniferous Dangheshan formation;7—Devonian-Carboniferous Amunik formation;8—Ordovician Yanchiwan formation;9—Caledonian monzogranite;10—the boundary of unconformity;11—measured reverse fault;12—measured left lateral strike slip fault;13—the fault of unknown nature is measured;14—occurrence of strata;15—gold mine origin (point);16—study area

Landscape characteristics of the study area

元素组合	异常强度			异常面积 S/km²	衬度 (K= $X ˉ$ /T)	异常NAP值 (K×S)	浓度分带
元素组合	$X ˉ$	T	峰值	异常面积 S/km²	衬度 (K= $X ˉ$ /T)	异常NAP值 (K×S)	浓度分带
As-21	54.3	13.21	11542	90.32	4.11	371.22	内、中、外
Au-32	7.24	3.50	65.7	75.6	2.07	156.49	内、中、外
Sb-25	4.4	0.94	885.1	77.7	4.7	365.19	内、中、外
W-13	1.9	1.36	4.8	49.5	1.4	69.30	中、外
Sn-27	2.5	1.79	4.6	25	1.4	35.00	中、外
Mo-44	1.6	1.23	2.7	11.4	1.3	14.82	外
Cu-12	41.0	34.17	61.5	32.3	1.2	38.76	外
Pb-34	40.9	37.18	46.3	18.3	1.1	20.13	外

Comprehensive anomaly characteristics of AS-7 in 1∶50 000 stream sediment survey

Analysis of AS-7 comprehensive anomaly in 1∶50 000 stream sediment survey
1—Quaternary system;2—Paleogene Baiyanghe formation;3—Triassic Junzihe Group;4—the upper member of Ordovician Yanchiwan formation;5—Ordovician Tenglong limestone;6—the lower member of Ordovician Yanchiwan formation;7—diorite;8—conformity boundary/unconformity boundary;9—measured reverse fault;10—faults of unknown nature;11—comprehensive abnormality and its number;12—gold producing area and its number

地层代号	岩性	样本数	Pb	Zn	W	As	Sb	Ag	Au
地层代号	岩性	样本数	$X ˉ$	$X ˉ$	$X ˉ$	$X ˉ$	$X ˉ$	$X ˉ$	$X ˉ$	S	C_v
Oyc¹	变岩屑长石砂岩粉砂质板岩	2136 310	23.54 23.42	51.77 58.68	1.32 1.29	22.42 17.71	1.11 1.06	63.48 86.45	7.05 4.58	55.84 6.05	6.54 3.65
Otl	灰岩变岩屑长石砂岩	730 1755	45.77 28.91	24.56 68.22	1.04 1.18	10.48 30.18	0.93 3.94	52.71 89.58	3.63 4.52	7.12 20.96	2.74 4.28
Oyc²	粉砂质板岩	1859	30.75	64.19	1.17	33.29	3.63	86.27	6.35	9.27	3.64
δ	闪长岩	267	23.59	62.53	1.85	39.88	5.12	84.11	10.13	165.22	6.69

Statistical table of element background value in study area

Load matrix of orthogonal rotation factor and information extraction table of factor analysis

Orthogonal rotation factor load diagram

Geological map and comprehensive anomaly distribution map of the study area
1—the fifth lithologic member of upper member of Ordovician Yanchiwan formation;2—the fourth lithologic member of the upper member of Ordovician Yanchiwan formation;3—the third lithologic member of the upper member of Ordovician Yanchiwan formation;4—the second lithologic member of the upper member of Ordovician Yanchiwan formation;5—the first lithologic member of upper member of Ordovician Yanchiwan formation;6—Ordovician Tenglong limestone;;7—the first lithologic member of the lower member of Ordovician Yanchiwan formation;8—diorite porphyrite;9—diorite;10—diabase porphyrite;11—gabbro;12—altered fracture zone;13—gold ore body;14—measured reverse fault;15—occurrence of strata;16—Au anomaly;17—As anomaly;18—As anomaly

异常编号	元素组合	异常强度		异常面积 S/km²	衬度 ( K= $X ˉ$ /T)	异常NAP值 (K×S)	浓度分带
异常编号	元素组合	$X ˉ$	峰值	异常面积 S/km²	衬度 ( K= $X ˉ$ /T)	异常NAP值 (K×S)	浓度分带
AR-4	Au-9	226	1505	0.22	41.09	9.04	内、中、外
	Ag-8	352.3	5050	0.41	5.21	2.14	内、中、外
	Sb-7	5.28	14.47	0.013	10.34	0.13	内、中、外
	Sb-8	7.17	27.85	0.03	19.89	0.60	内、中、外
	As-7	51.98	363	0.25	2.89	0.72	内、中、外
	Zn-3	167.5	1142	0.21	1.90	0.40	内、中、外
	W-2	2.28	12.23	2.59	1.42	3.68	内、中、外
	Cu-6	164.4	956	0.1	4.62	0.46	内、中、外
AR-6	Au-14	76.1	1084	0.47	10.95	5.15	内、中、外
	Au-18	31.3	31.3	0.02	4.5	0.09	内、中、外
	Sb-11	6.4	116.8	1.3	2.9	3.77	内、中、外
	As-15	70.3	336.8	1.2	3.4	4.08	内、中、外
	W-6	8.4	20.6	0.06	6.4	0.38	内、中、外
	Ag-45	152	880	0.77	1.9	1.46	中、外
	Mo-11	0.84	3.2	0.74	1.5	1.11	中、外
	Mo-10	0.74	0.94	0.05	1.4	0.07	外
	Cu-3	49.4	146	0.45	1.5	0.68	外
AR-8	Au-34	268.6	2462	0.47	38.6	18.14	内、中、外
	As-35	77.5	425.5	1	3.7	3.70	内、中、外
	Sb-12	5.47	19.34	0.04	3.91	0.16	内、中、外
	Sb-29	2.64	7.68	0.09	1.88	0.17	内、中、外
	Ag-26	159.3	859	0.3	1.9	0.57	中、外
AR-10	Au-26	35.43	1030	0.8	6.44	5.15	内、中、外
	As-22	138.12	1080	0.22	7.67	1.69	内、中、外
	As-23	56.60	118	0.08	3.14	0.25	内、中、外
	Sb-17	4.24	11.79	0.13	3.03	0.39	内、中、外
	Sb-18	3.27	6.79	0.05	2.34	0.12	内、中、外
	Ag-24	106.50	438	0.22	1.58	0.35	内、中、外
	Mo-16	1.67	17.61	0.14	2.79	0.39	中、外
AR-12	Au-29	63.89	502	0.38	11.62	4.42	内、中、外
	As-28	76.9	341.4	0.51	3.7	1.89	内、中、外
	Sb-21	2.98	11.57	0.15	2.13	0.32	内、中、外
	Sb-24	3.53	9.03	0.11	2.52	0.28	内、中、外
	W-11	3.1	4.8	0.02	2.4	0.05	外
	W-12	2.3	3.7	0.03	1.8	0.05	外
	Mo-12	4	7.7	0.06	7.2	0.43	外

Characteristics of main comprehensive anomalies in the study area

Rose diagram of anomalous strike in the study area
1—measured reverse fault;2—gold bearing alteration zone

Characteristics of gold ore bodies in the study area
a—surface features of ore bodies; b—altered cataclastic sandstone type gold ore bodies outcrop; c—altered cataclastic diorite type gold ore bodies outcrop; d—outcrops of quartz vein type Au,Ag,Pb and Zn ore bodies

Comparison of geochemical profiles
1—metalithic arkose;2—diabase;3—gold bearing alteration zone;4—Au content curve;5—As content curve;6—Sb content curve;7—Cu content curve;8—Pb content curve;9—Ag content curve

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