多维度化探异常研究在黔西南者相金矿床深部成矿预测中的应用

doi:10.11720/wtyht.2023.1338

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Abstract

Due to the lack of effective deep exploration techniques, it has become a key and difficult task to expand the scale of prospecting by obtaining the mineralization information in the deep and peripheral areas of the proven typical deposits of the Huijiabao anticline in southwestern Guizhou. To truly reflect the characteristics of deep geological anomalies, this study investigated the deep ore-bearing Longtan Formation of the Zhexiang gold deposit in the eastern Huijiabao anticline. The information on deep Au anomalies was extracted through geochemical exploration in boreholes of any azimuth according to the profiles, longitudinal profiles, and deep 3D planes of survey lines. Then this study summarized the distribution patterns of geochemical anomalies and evaluated the deep metallogenic potential of the Zhexiang gold deposit. The geochemical data obtained from deep boreholes were processed using the iterative histogram method and the sample length weighted average grade method, respectively. The results show that the Longtan Formation in the mining area had Au anomaly background values of (0.04~0.12)×10^-6 and an anomaly threshold of about 0.24×10^-6. As revealed by the anomaly contour maps generated from the processed data using the above two methods, the distribution characteristics of Au anomalies are in high agreement with those of deep ore bodies, and the distribution ranges of high Au anomalies in all profiles are highly consistent with the morphologies of the proved ore-bearing zones (bodies). Moreover, the large-scale and unclosed high Au anomalies follow the dip direction of fault F₂₀ in the first member of the Longtan Formation. The 3D distribution of Au anomalies shows that the nearly EW-directed high anomaly zone in the central mining area is consistent with the axial region of the Huijiapu anticline. As indicated by the analysis of the multi-dimensional geochemical anomalies and the geological characteristics of the study area, fault F₂₀ is the main ore transmitting and controlling fault in the mining area, and the northern and eastern deep parts around the mining area have great metallogenic and prospecting potential. In addition, two prospecting targets were delineated, needing further engineering verification. This study plays an important demonstration role in guiding the exploration of other mining areas in the Huijiabao anticline. The feasible study methods can be referenced for the study of geochemical anomalies in other mining areas.

Key words： metallogenic prediction Longtan formation deep multidimensional anomaly Zhexiang gold deposit sample length weighted average grade method prospecting target

Received: 03 July 2022 Published: 11 October 2023

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	Wen-Xing TAI
	Cheng-Fu YANG
	Xiao-Ye JIN
	Yun-Bin SHAO
	Guang-Fu LIU
	Ping ZHAO
	Ze-Peng WANG
	Li-Jin TAN

Cite this article:

Wen-Xing TAI,Cheng-Fu YANG,Xiao-Ye JIN, et al. Application of the multi-dimensional study of geochemical anomalies in deep metallogenic prediction of the Zhexiang gold deposit in southwestern Guizhou, China[J]. Geophysical and Geochemical Exploration, 2023, 47(4): 856-867.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.1338 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I4/856

3])
1—Quaternary floating soil;2—clay rocks of the second sub-member of the first member of Jialingjiang formation of Triassic system;3—dolomite limestone of the first sub-member of the first member of Jialingjiang formation of Triassic system;4—calcareous clay rocks of the third member of the Yelang formation of Triassic system;5—bioclastic limestone of the second member of the Yelang formation of Triassic system;6—normal fault;7—thrust fault;8—anticline;9—gold deposit;10—line of survey
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Distribution of Huijiapu anticline ore field (a) and geology of Zhexiang gold deposit (b) in southwest of Guizhou Province(revised according to reference [3])
1—Quaternary floating soil;2—clay rocks of the second sub-member of the first member of Jialingjiang formation of Triassic system;3—dolomite limestone of the first sub-member of the first member of Jialingjiang formation of Triassic system;4—calcareous clay rocks of the third member of the Yelang formation of Triassic system;5—bioclastic limestone of the second member of the Yelang formation of Triassic system;6—normal fault;7—thrust fault;8—anticline;9—gold deposit;10—line of survey

3D distribution map of borehole sampling with Longtan formation in Zhexiang gold deposit

Normal distribution-histogram of Au element anomaly background values of the six exploration lines

Background values and lower limits of geochemical anomalies of the six exploration lines

The variation rule of Au anomaly background value and anomaly lower limit of the six exploration lines in Zhexiang gold depodit

Au element anomaly map of six lines in Zhexiang gold deposit

3])
1—drilling holes;2—ore body and its number;3—line of omission;4—geological boundary line;5—the (presumed) fracture;6—Permian Maokou formation;7—structural erosion variant;8—Permian Longtan formation;9—Permian Changxing formation and Dalong formation;10—Triassic Yelang formation;11—Triassic Jialingjiang formation
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Ore distribution map of Lontan formation in Zhexiang gold deposit(revised according to reference [3])
1—drilling holes;2—ore body and its number;3—line of omission;4—geological boundary line;5—the (presumed) fracture;6—Permian Maokou formation;7—structural erosion variant;8—Permian Longtan formation;9—Permian Changxing formation and Dalong formation;10—Triassic Yelang formation;11—Triassic Jialingjiang formation

Normal distribution-histogram of Au element anomaly background values in profile line 624 and 625

Comparison of Au element anomalies and orebody characteristics in 624 and 625 profile

钻孔	总样长/ m	样品数	线金属量	Au加权平均品位/ 10^-6	钻孔	总样长/ m	样品数	线金属量	Au加权平均品位/ 10^-6	钻孔	总样长/ m	样品数	线金属量	Au加权平均品位/ 10^-6
ZK40764	229.45	210	929.53	0.41	ZK60064	165.58	161	294.47	0.18	ZK60801	208.56	204	122.45	0.06
ZK41924	244.45	226	596.89	0.24	ZK60024	252.95	236	914.03	0.36	ZK60824	184.50	175	466.04	0.25
ZK41916	197.72	188	259.01	0.13	ZK43901	282.09	256	397.89	0.14	ZK60832	252.88	249	533.41	0.21
ZK42308	261.40	248	589.34	0.23	ZK60924	395.53	380	1156.56	0.29	ZK60848	163.18	163	210.14	0.13
ZK42301	254.81	240	738.35	0.29	ZK43916	287.45	269	559.61	0.20	ZK60840	175.31	164	372.23	0.21
ZK42309	144.00	139	408.61	0.28	ZK60940	295.15	286	694.79	0.24	ZK43941	214.88	196	597.61	0.28
ZK42733	369.54	334	1229.94	0.33	ZK60908	346.72	359	1147.11	0.33	ZK42380	128.84	122	170.49	0.13
ZK40780	252.70	227	209.14	0.08	ZK43932	219.44	205	508.39	0.23	ZK60440	197.92	193	223.81	0.11
ZK41564	259.96	237	421.62	0.16	ZK43948	211.29	199	486.53	0.23	ZK60448	195.39	184	257.33	0.13
ZK42324	188.91	173	177.30	0.09	ZK61708	241.26	230	326.99	0.14	ZK60456	172.32	172	379.21	0.22
ZK42316	265.88	242	1199.16	0.45	ZK45501	203.65	191	691.86	0.34	ZK60432	270.21	259	380.15	0.14
ZK62016	196.87	189	409.46	0.21	ZK62516	335.30	321	832.74	0.25	ZK60424	246.10	239	1153.89	0.47
ZK62024	201.76	189	200.19	0.10	ZK45516	189.12	177	459.33	0.24	ZK42396	235.92	218	563.21	0.24
ZK45301	268.37	252	745.93	0.28	ZK40708	176.52	169	272.65	0.15	ZK43917	315.30	286	1468.45	0.47
ZK41580	271.83	255	323.68	0.12	ZK40716	296.61	269	509.79	0.17	ZK60001	395.31	365	684.65	0.17
ZK42332	244.74	235	82.53	0.03	ZK40717	253.44	255	356.46	0.14	ZK60048	175.49	167	268.81	0.15
ZK61601	311.69	305	561.75	0.18	ZK40720	155.87	151	396.81	0.26	ZK41132	200.35	182	294.94	0.15
ZK61616	194.82	181	243.22	0.13	ZK40724	146.50	122	168.82	0.12	ZK41140	130.80	123	203.31	0.16
ZK61624	234.21	230	729.29	0.31	ZK40732	197.55	190	763.95	0.39	ZK41501	336.71	308	363.42	0.11
ZK61632	166.74	158	611.43	0.37	ZK40740	150.05	143	357.78	0.24	ZK41508	99.76	92	266.52	0.27
ZK42348	329.20	281	840.39	0.26	ZK40748	305.67	287	921.37	0.30	ZK41516	274.65	247	633.97	0.23
ZK61216	254.63	241	367.28	0.14	ZK41108	99.41	93	78.48	0.08	ZK41520	114.39	110	815.82	0.71
ZK61224	205.88	197	429.88	0.21	ZK41116	221.30	214	174.94	0.08	ZK41524	186.61	174	914.88	0.49
ZK61240	238.77	249	437.91	0.18	ZK41120	197.52	187	662.82	0.34	ZK41532	248.35	230	404.43	0.16
ZK61232	247.55	240	634.79	0.26	ZK41124	150.55	140	263.39	0.18	ZK41548	155.85	255	392.24	0.25
ZK42364	270.69	250	821.25	0.30	ZK41128	135.57	131	414.28	0.31	ZK41901	218.79	213	291.80	0.13
ZK41904	197.55	255	448.63	0.23	ZK41909	141.37	135	480.25	0.34
ZK41908	269.65	254	836.51	0.31	ZK42317	194.47	199	389.46	0.20

Weighted average grade value of each borehole sample length in deep Longtan formation of Zhexiang gold deposit

3D anomaly map of Au element of deep Longtan formation in Zhexiang gold deposit

Deep structural ore-conttrolling model map in Zhexiang gold deposit
1—ore body;2—fracture;3—limestone;4—silted sandstone;5—clay rock;6—silty clay rock;7—direction of hydrothermal flow;8—variation of corrosion

The map of prospecting target area in the periphery of Zhexiang gold deposit

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