安徽省祁门—黟县地区水系沉积物地球化学特征及找矿方向

doi:10.11720/wtyht.2020.1060

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Abstract

Based on 1∶50 000 stream sediments survey and mathematical statistics of analytical results of 5 386 samples, the authors conducted an in-depth study of the geochemical characteristics of ore-forming elements of Qimen-Yixian area in Anhui Province. Through element geochemical characteristics analysis and R cluster analysis, the element combination was divided into three types, namely, high temperature anomaly, medium temperature anomaly and low temperature anomaly. The distribution law of combined anomalies shows polymetallic element enrichment in Qimen-Yixian area, mainly controlled by Yanshanian magmatic-tectonic mineralization system and Cambrian black rock series. On such a basis, six polymetallic metallogenic prospective areas were delineated according to geological and mineral resources features. Gold was selected as the dominant mineral, and the target deposit types are magmatic hydrothermal filling and skarn types. Anomaly verification and mineral exploration were carried out in Huanggutian, Guxi, Jinjiashan areas of Qimen County based on the results of the stream sediments survey. A batch of gold, tungsten, molybdenum orebodies were discovered, indicating that there exists great application value of prospecting in this area.

Key words： stream sediments geochemical characteristics contrast value anomaly metallogenic prospective province Qimen-Yixian area

Received: 24 January 2019 Published: 03 March 2020

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	Wang-Fei WENG
	De-En WANG
	Bang-Min WANG
	Yong DING
	Yong-Jun WANG

Cite this article:

Wang-Fei WENG,De-En WANG,Bang-Min WANG, et al. Geochemical characteristics of stream sediments and prospecting direction in Qimen-Yixian area of Anhui Province[J]. Geophysical and Geochemical Exploration, 2020, 44(1): 1-12.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.1060 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I1/1

8](a) and regional geological minerals sketch diagram(b) of Qimen-Yixian area
1—Cenozoic strata; 2—continental sedimentary caprock of Jurassic-Cretaceous system; 3—marine sedimentary caprock of Nanhua-Triassic system; 4—metamorphic basement of Meso-Neoproterozoic strata; 5—granite of late Yanshanian period; 6—granite of early-middle Yanshanian period; 7—granite of late Jinning period; 8—granite of early Jinning period; 9—ophiolite suite (Fuchuan village of Shexian county); 10—major faults; 11—deposit points (yellow—gold mine, green—copper mine, blue—lead zinc ore; purple—tungsten ore); 12—research area; F1—Jiangnan fault; F2—Chengan-Zhentou fault; F3—Qimen-Sanyang fault; F4—Qimen-Wucheng fault; F5—Wucheng-Jixi fault; F6—Jiangwan-Jiekou fault
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Geotectonic map^[8](a) and regional geological minerals sketch diagram(b) of Qimen-Yixian area
1—Cenozoic strata; 2—continental sedimentary caprock of Jurassic-Cretaceous system; 3—marine sedimentary caprock of Nanhua-Triassic system; 4—metamorphic basement of Meso-Neoproterozoic strata; 5—granite of late Yanshanian period; 6—granite of early-middle Yanshanian period; 7—granite of late Jinning period; 8—granite of early Jinning period; 9—ophiolite suite (Fuchuan village of Shexian county); 10—major faults; 11—deposit points (yellow—gold mine, green—copper mine, blue—lead zinc ore; purple—tungsten ore); 12—research area; F1—Jiangnan fault; F2—Chengan-Zhentou fault; F3—Qimen-Sanyang fault; F4—Qimen-Wucheng fault; F5—Wucheng-Jixi fault; F6—Jiangwan-Jiekou fault

9]
1—continental sedimentary caprock of Jurassic-Cretaceous system; 2—marine sedimentary caprock of Nanhua-Cambrian system; 3—shallow metamorphic clastic rock of Qingbaikou system; 4—shallow metamorphic clastic rock of Meso-Neoproterozoic strata; 5—Granodiorite porphyry of Jurassic period;6—biotite granodiorite of Qingbaikou period; 7—granite-porphyry vein; 8—quartz diorite porphyry vein; 9—diabase; 10—garrbo; 11—fault; 12—brittle-ductile shear zone; 13—deposit(mining points). F1—thrust compression fault zone of Chengan-Zhentou; F2—Qimen-Sanyang fault zone; F3—ductile shear zone of Shejing-Qinglingshan-Guzhulin; F4—Ruokeng fault; F5—Puling fault; F6—Dongyuan-Likou fault; F7—Guantian-Liudu fault; F8—Qinglingshan fault; F9—Yuting fault; F10—Xianyushan fault; F11—Dongyuan-Baixi fault;(1)—copper, lead and zinc polymetallic ore point of Ruokeng in Qimen county; (2)—copper mine point of Xiangdong in Qimen county; (3)—copper mineralization point of Beikeng in Qimen county; (4)—tungsten molybdenum ore of Dongyuan in Qimen county(large mine); (5)—gold mine of Huanggutian in Qimen county;(6)—gold mine of Liaojia in Qimen county(small mine); (7)—gold mine of Jinjiashan in Qimen county(small mine); (8)—gold mine of Wangjiatan in Qimen county; (9)—antimony ore of Taofengshan in Qimen county; (10)—Lead-zinc ore of Sanbao in Qimen county(middle mine); (11) —tungsten ore point of Guanluxia in Yixian county; (12)— Lead-zinc ore of Pingshan in Yixian county; (13) —vanadium ore of Shishan in Yixian county(middle mine)
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Geological minerals sketch diagram of Qimen-Yixian area^[9]
1—continental sedimentary caprock of Jurassic-Cretaceous system; 2—marine sedimentary caprock of Nanhua-Cambrian system; 3—shallow metamorphic clastic rock of Qingbaikou system; 4—shallow metamorphic clastic rock of Meso-Neoproterozoic strata; 5—Granodiorite porphyry of Jurassic period;6—biotite granodiorite of Qingbaikou period; 7—granite-porphyry vein; 8—quartz diorite porphyry vein; 9—diabase; 10—garrbo; 11—fault; 12—brittle-ductile shear zone; 13—deposit(mining points). F1—thrust compression fault zone of Chengan-Zhentou; F2—Qimen-Sanyang fault zone; F3—ductile shear zone of Shejing-Qinglingshan-Guzhulin; F4—Ruokeng fault; F5—Puling fault; F6—Dongyuan-Likou fault; F7—Guantian-Liudu fault; F8—Qinglingshan fault; F9—Yuting fault; F10—Xianyushan fault; F11—Dongyuan-Baixi fault;(1)—copper, lead and zinc polymetallic ore point of Ruokeng in Qimen county; (2)—copper mine point of Xiangdong in Qimen county; (3)—copper mineralization point of Beikeng in Qimen county; (4)—tungsten molybdenum ore of Dongyuan in Qimen county(large mine); (5)—gold mine of Huanggutian in Qimen county;(6)—gold mine of Liaojia in Qimen county(small mine); (7)—gold mine of Jinjiashan in Qimen county(small mine); (8)—gold mine of Wangjiatan in Qimen county; (9)—antimony ore of Taofengshan in Qimen county; (10)—Lead-zinc ore of Sanbao in Qimen county(middle mine); (11) —tungsten ore point of Guanluxia in Yixian county; (12)— Lead-zinc ore of Pingshan in Yixian county; (13) —vanadium ore of Shishan in Yixian county(middle mine)

Analytic technique and detection limit of stream sediment samples

参数	Sb	Pb	As	Bi	Cu	Ag	Zn	Hg	Mo	W	Au
平均值( $X ˉ$ )	1.77	32.44	14.36	0.86	29.03	115.81	122.36	136.08	1.65	3.82	2.73
最大值(X_max)	100	1000	295.10	100	400	10000	501.2	10665	93.88	263.74	291.89
标准离差(S)	2.83	22.98	15.50	2.59	20.67	301.17	44.26	284.35	4.06	7.80	8.60
变异系数(C_v)	1.60	0.71	1.08	3.00	0.71	2.60	0.36	2.09	2.46	2.04	3.15
背景值	1.24	30.99	11.05	0.63	26.35	83.68	119.52	102.83	0.86	2.83	1.81
浓集系数(K)	2.17	1.21	1.37	2.24	1.14	0.92	1.64	2.11	1.32	1.35	1.08

Geochemical parameters of stream sediments in Qimen-Yixian area

Variation coefficients of ore-forming elements in Qimen-Yixian area
C_v1—coefficient of variation before cyclic elimination of high and low values; C_v2—coefficient of variation after cyclic elimination of high and low values

元素	参数	地层单元
元素	参数	Pt_2-3	Nh-∈	J-K	γ
	$X ˉ$	2.61	2.61	3.11	3.89
Au	S	8.57	3.04	13.24	9.83
	C_v	3.29	1.17	4.26	2.53
	$X ˉ$	91.02	416.68	156.71	91.28
Ag	S	97.79	905.94	792.24	61.35
	C_v	1.07	2.17	5.06	0.67
	$X ˉ$	29.76	37.15	17.96	19.41
Cu	S	19.71	29.75	11.08	18.20
	C_v	0.66	0.80	0.62	0.94
	$X ˉ$	32.55	43.19	24.43	25.35
Pb	S	12.25	73.38	8.98	11.78
	C_v	0.38	1.70	0.37	0.47
	$X ˉ$	125.49	146.24	77.97	88.73
Zn	S	36.31	84.46	35.08	41.15
	C_v	0.29	0.58	0.45	0.46
	$X ˉ$	3.24	4.08	3.94	9.08
W	S	5.94	4.36	3.30	17.90
	C_v	1.84	1.07	0.84	1.97
	$X ˉ$	126.01	216.11	302.29	110.04
Hg	S	193.82	378.44	1135.94	130.78
	C_v	1.54	1.75	3.76	1.19
	$X ˉ$	0.97	8.13	1.24	2.91
Mo	S	1.12	10.14	0.93	7.45
	C_v	1.15	1.25	0.75	2.56
	$X ˉ$	0.69	1.20	0.52	2.34
Bi	S	1.60	2.54	0.30	6.74
	C_v	2.32	2.12	0.59	2.88
	$X ˉ$	13.84	24.75	25.42	7.15
As	S	12.91	31.03	22.41	8.78
	C_v	0.93	1.25	0.88	1.23
	$X ˉ$	1.69	3.17	2.85	0.97
Sb	S	2.55	5.24	4.03	0.92
	C_v	1.51	1.65	1.42	0.95

Geochemical parameters of stream sediments in different geological units

R-cluster analysis diagram of ore-forming elements in Qimen-Yixian rear

Anomalous maps of major metallogenic element of stream sediments and metallogenic prospect province in Qimen-Yixian area

Geological minerals sketch diagram in Jin Jiashan area of Qimen
1—lower segment of Proterozoic Niuwu formation; 2—Proterozoic huansha formation; 3—special lithological layer: purple-red argillaceous siltstone; 4—granite-porphyry vein; 5—quartz vein; 6—quartz diorite porphyry vein; 7—andesitic porphyry vein; 8—fault structural zone; 9—gold anomaly in soil geochemical prospecting; 10—arsenic anomaly in soil geochemical prospecting; 11—plate occurrence; 12—location and number of groove project; 13—gold ore body; 14—river and flow

Pictures of gold ore in Qimen area
a—altered rock type gold ore with arsenopyrite mineralization in Jinjiashan abnormal verification area; b—quartz vein type gold ore with arsenopyrite mineralization in Huanggutian abnormal verification area; c—tectonic altered rock type gold ore with arsenopyrite mineralization in Huanggutian abnormal verification area.

Geological minerals sketch diagram in Huang Gutian area of Qimen
1—lower segment of Proterozoic Niuwu formation; 2—upper segment of Proterozoic Niuwu formation; 3—Proterozoic Huansha formation; 4—lamprophyre vein; 5—quartz vein; 6—fault; 7—stratigraphic boundary; 8—groove project; 9—gold orebody; 10—attitude of strata; 11—gold anomaly and arsenic anomaly of soil geochemical exploration and their lower abnormal limit; 12—river and flow

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