玲珑金矿田含矿断裂的基岩地球化学特征及找矿潜力评价

doi:10.11872/j.issn.1005-2518.2022.04.064

Abstract

Abstract:

The mineralization of Linglong gold ore-field is controlled by faults.In the process of gold mineralization，the fault is not only the channel of mineralization fluid，but also the surrounding rocks in direct contact with mineralization fluid.The fluid and wall rocks on both sides of the fault must have metasomatic reactions.Therefore，it is of great significance to study the geochemical characteristics of bedrock in fault profile for metallogenic research and prospecting prediction.Based on the study of geochemical characteristics of bedrock profiles of ore-bearing faults and Zhaoping fault in Linglong gold field，taking ascertain orebody as research template，a comprehensive study of the correlation between Au and other trace elements in orebody-wall rock，lean-rich ore，local-whole was conducted.Combined with mineralogical characteristics and geo-chemical characteristics of element halo of gold deposit，application research on metallogenic prediction of unknown orebodies was performed.Regarding 7 orebodies profile as the research object，by comparing the correlation between Au and trace elements in orebody and surrounding rock，the variation characteristics and correlation of trace elements in orebody profile in local range were analyzed，and the best indicator elements of Au in typical orebodies in the ore field were summarized.According to the gold grade，352 orebodies can be divided into five types （super rich ore，rich ore，lean ore，super lean ore，surrounding rock）.The average content of trace elements in various orebodies was counted， and the difference in the indication meaning of trace elements in rich and poor ores was compared.On the premise of a large number of sample data statistics， the correlation between Au and other trace elements in the Linglong ore field was summarized through scatter plots. Combined with the occurrence form of gold and various trace elements， the geological significance of Au and various trace elements， and the diagenesis and mineralization mechanism of Linglong gold ore field were discussed.The above research results were applied to other faults in Linglong gold field，and the primary halo geochemical halo method was used to predict fault mineralization.The following understandings are obtained：The best indicator element combination of primary halo in Linglong gold field is Au，Ag，Bi，As and Co，and the positive correlation of power exponent among Au with Ag，Bi，As and Co elements is good.Gold exists in the form of silver gold ore，mainly in the form of fine grains or veins in the fissures and crystal gaps of pyrite.The geochemical survey of bedrock profile of Zhaoping fault shows two gold mineralization anomalies，which are supposed to be ore-induced anomalies and have good prospecting potential，especially in the 1021 profile of east Qianhuayuancun.Based on the geochemical survey method of bedrock in fault profile，the prospecting object is expanded by changing prospecting into halo，and the deep metallogenic prospect can be predicted according to the difference of halo forming element distribution.

Key words: indicator elements combination, bedrock geochemical, mineralization anomalies, prospecting and evaluation, Zhaoping fault, Linglong gold field, Jiaodong

CLC Number:

P618.51

Baoqun HU,Haidong GAO,Yun WANG,Baolin ZHANG,Guxian LV,Yuke SHEN,Tao GUO. Bedrock Geochemical Characteristics and Prospecting Potential Evaluation of Ore-Bearing Faults in Linglong Gold Ore-field[J].Gold Science and Technology, 2022, 30(4): 518-531.

Figures/Tables 9

Fig.1

Table 1

Composition variation of typical orebody profiles（×10-6）"

采样位置	样号	岩性	点距/m	Au	Ag	As	Bi	Co	Cu	Hg	Mn	Mo	Ni	Pb	Sb	Th	U	V	Zn
剖面1： -570 m 175支2 的84川	LL008	弱钾化花岗岩	0	0.034	0.02	0.2	0.03	1	4	<0.005	104	0.33	<1	19	<0.05	6.3	0.25	4	14
	LL009	红色强钾化花岗岩	5.0	0.149	0.13	0.1	0.08	2	1	<0.005	77	0.34	<1	17	<0.05	7.1	0.42	3	8
	LL010	灰绿色蚀变岩（原岩花岗岩）	1.5	0.714	0.18	1.3	0.33	3	12	<0.005	383	0.26	1	8	0.07	6.6	1.18	35	24
	LL011	石英硫化物矿石（矿体）	1.5	52.200	16.20	83.4	32.00	381	5	0.049	45	1.72	16	16	0.33	4.0	1.67	17	4
	LL012	石英硫化物矿石（矿体）	1.5	40.500	12.35	41.3	17.70	177	3	0.010	68	1.36	14	5	0.11	2.7	0.76	5	4
	LL013	富硫化物中等硅化花岗质碎裂岩（矿体）	1.5	63.300	20.90	64.3	26.10	284	3	0.014	53	1.32	18	10	0.23	5.0	1.11	22	5
	LL014	中等硅化花岗岩	2.0	0.296	0.23	2.0	0.32	4	14	<0.005	164	1.51	1	38	0.06	3.4	0.16	4	21
剖面2： -620 m 175支2 的74川	LL021	强钾化花岗岩	0	0.014	0.02	0.4	0.02	1	6	<0.005	133	0.49	2	20	<0.05	4.9	0.20	4	28
	LL022	基性岩脉	2.0	0.088	0.03	0.1	0.18	14	3	<0.005	603	1.19	40	12	0.05	2.1	0.65	79	71
	LL023	中等硅化弱钾化花岗岩	3.0	0.216	0.05	0.9	0.18	1	2	<0.005	86	0.41	1	20	0.05	1.5	0.12	4	16
	LL024	硅化硫化物（矿体）	1.5	48.300	6.06	40.6	27.80	196	11	0.008	77	1.22	17	22	0.58	2.4	0.17	5	9
	LL025	弱钾化强硅化花岗岩	2.0	0.082	0.02	0.2	0.14	1	2	<0.005	184	0.45	2	13	0.05	1.2	0.23	3	11
	LL026	中等硅化花岗岩	4.0	0.075	0.65	0.9	1.53	3	4	0.066	207	0.47	1	83	0.07	1.5	0.36	3	10
剖面3： -670 m 175支2 的88川	LL036	中等钾化花岗岩	0	0.061	0.05	0.7	0.11	6	2	<0.005	131	0.48	2	14	<0.05	6.0	0.31	4	13
	LL037	含矿钾化花岗岩	1.0	4.190	2.81	18.3	1.04	13	53	<0.005	169	0.34	1	223	0.08	4.3	0.23	4	44
	LL038	石英硫化物（矿体）	2.0	7.210	3.41	73.8	3.82	63	2	<0.005	48	8.14	8	11	0.07	0.8	0.45	38	8
	LL039	石英硫化物（矿体）	1.5	6.000	1.87	7.9	19.65	18	2	<0.005	116	4.82	3	13	<0.05	2.0	0.68	7	10
	LL040	硅化、泥化构造岩（矿体）	2.0	13.350	4.25	8.2	13.40	24	12	0.005	103	3.02	4	34	0.16	3.6	0.75	14	34
	LL041	强硅化花岗岩	1.5	1.960	1.48	26.1	4.63	36	2	<0.005	499	0.32	8	48	0.09	7.2	1.36	58	21
	LL042	强硅化弱钾化花岗岩	2.0	0.074	0.08	2.0	0.13	2	13	<0.005	224	0.29	1	30	0.11	5.9	0.26	3	17
剖面4： -720 m 47支3 的97川	LL101	中等钾化花岗岩	0	0.002	0.02	0.2	0.01	2	3	<0.005	165	0.60	1	22	0.05	4.7	0.16	4	45
	LL102	弱钾化花岗岩	0	0.002	0.02	0.4	0.04	4	4	<0.005	568	0.34	10	<2	<0.05	6.6	0.40	39	28
	LL103	中等钾化花岗岩	4.0	0.004	0.01	0.2	0.01	2	2	<0.005	163	0.33	<1	19	<0.05	5.3	0.19	4	31
	LL104	黄铁矿化花岗岩	3.0	2.740	3.85	24.6	20.90	325	11	<0.005	68	0.93	24	17	0.07	3.0	0.49	5	12
	LL105	强钾化花岗岩	1.0	0.239	0.29	1.6	0.95	19	4	<0.005	119	0.42	1	15	<0.05	3.3	0.18	3	10
	LL106	中等钾化花岗岩	2.0	34.000	4.60	4.6	15.45	34	33	<0.005	164	0.98	3	17	<0.05	4.6	0.26	5	12
	LL107	中等钾化花岗岩	3.0	0.041	0.02	0.1	0.04	2	7	<0.005	125	0.47	<1	20	<0.05	5.7	1.34	4	27
	LL108	花岗岩	0	0.028	0.06	0.3	0.15	3	6	<0.005	394	0.49	12	3	<0.05	8.3	0.42	17	22
剖面5： -620 m 47号脉 87线	LL293	钾化花岗岩	0	0.023	0.02	0.8	0.08	1	<1	<0.005	109	0.61	<1	23	<0.05	6.6	0.18	3	7
	LL294	硅化硫化物（矿体）	2.5	0.466	0.98	22.0	3.70	39	<1	<0.005	25	0.35	4	14	0.05	1.3	0.11	18	<2
	LL295	中等硅化花岗岩	2.0	0.027	0.06	0.4	0.13	2	<1	<0.005	240	0.28	2	28	<0.05	1.2	0.39	4	2
	LL296	弱钾化花岗岩	1.0	0.105	0.11	2.1	0.25	2	6	<0.005	257	0.34	3	19	<0.05	7.0	0.30	3	6

Table 1

Fig.2

Table 2

Table 3

Fig.3

Fig.4

Table 4

Fig.5

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剖面号	矿体及位置	最佳指示元素	弱指示意义元素	指示意义不明的元素
1	-570 m175支2的84川	Au，Ag，Bi，As，Ni，Co	Sb，Hg，U	Cu，Pb，Mn，Mo，Th，V，Zn
2	-620 m175支2的74川	Au，Ag，Bi，As，Sb	Co，Ni，Cu，Mo	Hg，Mn，Pb，Th，U，V，Zn
3	-670 m175支2的88川	Au，Ag，Bi，As	Mo，Ni，Co，V	Cu，Hg，Mn，Pb，Sb，Th，U，Zn
4	-720 m47支3的97川	Au，Ag，Bi，As，Co	Cu，Mo	Hg，Mn，Ni，Pb，Sb，Th，U，V，Zn
5	-620 m47号脉87线	Au，Ag，Bi，As，Co	V，Ni	Cu，Hg，Mn，Mo，Pb，Sb，Th，U，Zn
6	-570 m50号脉88川	Au，Ag，As，Bi，Co	Cu，Mo，Ni	Hg，Mn，Pb，Sb，Th，U，V，Zn
7	-420 m48号脉92线	Au，Ag，As，Bi，Co，Mo	Sb，Hg，Cu，Pb，Zn	Mn，Ni，Th，U，V

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[2]	Yifan LI,Hongkui LI,Xuelin HAN,Ke GENG,Yubo ZHANG,Guodong CHEN. Genesis of Xiadian Gold Deposit in Jiaodong：Evidence from Fluid Inclusions and Isotopes [J]. Gold Science and Technology, 2021, 29(2): 184-199.
[3]	Zhen ZHANG, Shengyuan NING, Zengtian XU. Mineralogy of Gold-bearing Pyrite and Its Significance for Deep Prospecting in the Jiuqu Gold Deposit，Linglong Area，Jiaodong Peninsula [J]. Gold Science and Technology, 2020, 28(3): 328-336.
[4]	Yumin CHEN,Qingdong ZENG,Zhifu SUN,Zhaokun WANG,Hongrui FAN,Fengli XIAO,Shaoxiong CHU. Study on Geochemical Background Field of the Gold Deposits in Jiaodong，China [J]. Gold Science and Technology, 2019, 27(6): 791-801.
[5]	Yumin CHEN, Huafeng ZHANG, Congying ZHANG, Huanlong HU, Zhaokun WANG, Qingdong ZENG, Hongrui FAN. Pyrite Typomorphic Characteristics：Implication for Deep Gold Mineralization in the Sanshandao Gold Deposit，Jiaodong Peninsula [J]. Gold Science and Technology, 2019, 27(5): 637-647.
[6]	Weiqing SUN,Shen LIU,Caixia FENG,Yan FAN,Yongchang LIU. Research on Ore-Control Conditions and Metallogenic Law of Gold Deposits in Central Zhaoping Fault，Eastern Shandong Province [J]. Gold Science and Technology, 2019, 27(3): 315-327.
[7]	Shipeng LIU,Shuya WANG,Xinxin FENG,Chuanyin YIN. Intergrated Geophysical Constraint to the NW-trending Fault Zone in the Xiling Gold Deposit，Sanshandao，Shandong Province [J]. Gold Science and Technology, 2019, 27(1): 25-32.
[8]	Guanghe LIANG. Discussion on Several Key Problems of the Tanlu Fault [J]. Gold Science and Technology, 2018, 26(5): 543-558.
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Bedrock Geochemical Characteristics and Prospecting Potential Evaluation of Ore-Bearing Faults in Linglong Gold Ore-field

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矿体编号	金含量区间	样品数量	Au	Ag	As	Sb	Bi	Hg	Mn	Cu	Pb	Zn	Mo	Co	Ni	V	Th	U
背景	背景区	16	0.001	0.01	0.13	<0.05	0.01	0.007	146	2.5	25	22	0.39	1.07	2	3	7.3	0.27
175号	>10	13	35.070	8.06	60.08	0.22	16.46	0.010	93	4.1	18	21	2.90	277.00	22	20	3.5	1.11
	1~10	14	3.888	1.89	26.39	0.11	4.42	0.005	134	68.6	35	18	1.35	58.21	11	26	4.0	0.56
	0.1~1.0	24	0.484	0.58	4.80	0.08	1.87	0.005	159	6.0	58	111	0.76	18.42	3	8	4.0	0.44
	0.01~0.10	39	0.040	0.07	0.99	0.05	0.13	0.007	188	5.5	20	32	0.48	2.64	2	7	5.0	0.37
	<0.01	16	0.005	0.02	0.28	0.06	0.03	0.005	136	7.1	17	18	0.39	1.81	2	6	3.7	0.44
47号	>100	1	957.000	99.80	16.20	0.07	105.00	0.021	52	8.0	60	32	10.95	56.00	6	19	2.1	0.85
	10~100	4	17.288	6.47	23.90	0.13	7.88	0.010	129	84.5	324	99	2.03	27.50	5	10	3.1	0.22
	1~10	13	2.376	2.21	23.77	0.09	3.72	0.008	268	115.1	214	139	1.03	40.85	9	15	3.8	0.38
	0.1~1.0	31	0.364	0.77	9.61	0.06	1.37	0.005	201	58.9	51	19	0.49	8.29	5	6	3.9	0.25
	0.01~0.10	46	0.038	0.10	2.32	0.06	0.21	0.005	208	5.9	21	33	0.50	3.26	4	7	3.9	0.31
	<0.01	21	0.004	0.03	1.23	0.05	0.03	0.005	157	5.3	20	27	0.35	1.84	3	7	3.6	0.28
50号	>10	1	13.600	8.07	41.60	0.17	2.15	0.005	1905	889.0	94	12	2.05	22.00	4	2	0.6	0.10
	1~10	13	2.500	2.90	14.69	0.10	0.55	0.005	457	297.7	197	176	0.87	6.92	3	4	2.1	0.10
	0.1~1.0	25	0.250	0.44	5.64	0.08	0.34	0.005	481	21.4	26	25	0.63	3.48	10	10	3.4	0.26
	0.01~0.10	34	0.046	0.12	1.24	0.06	0.11	0.006	233	23.9	21	11	0.46	1.68	2	3	4.1	0.23
	<0.01	16	0.006	0.02	0.38	0.05	0.05	0.006	173	4.1	19	13	0.37	1.38	3	4	4.6	0.36
48号	1~10	1	7.670	9.71	40.80	0.69	1.29	0.012	71	29.0	450	301	3.32	14.00	5	4	0.7	0.30
	0.1~1.0	4	0.437	1.74	22.90	0.22	0.65	0.012	220	43.3	639	1 787	1.25	21.75	4	5	3.4	0.24
	0.01~0.10	12	0.026	0.12	1.38	0.06	0.11	0.005	241	4.0	27	35	0.39	2.33	3	4	5.6	0.35
	<0.01	8	0.004	0.03	0.19	0.05	0.03	0.005	132	1.5	26	9	0.42	1.13	1	3	6.9	0.34

剖面编号及位置	样品编号	采样位置	点位 /m	Au	Ag	As	Bi	Co	Cu	Hg	Mn	Mo	Ni	Pb	Th	U	V	Zn
1012剖面（郭家埠南侧小公路）	1012-5	钾化碎裂花岗岩	164	0.001	0.02	0.2	0.15	4	3	<0.005	166	0.19	21	10	3.2	0.20	35	50
	1012-7	绢英岩化碎裂岩	197	0.017	0.04	0.1	0.15	3	14	<0.005	730	0.85	9	14	3.6	1.06	22	70
	1012-7C	白色断层泥	197	0.008	0.11	1.4	0.25	5	18	<0.005	831	0.64	14	48	2.6	0.80	24	61
	1012-8	褐铁矿化绢英岩	192	0.007	0.05	0.3	0.05	2	6	<0.005	2 720	1.32	4	25	2.3	2.03	11	63
	1012-9	褐铁矿化绢英岩	199	<0.001	0.01	0.1	0.02	1	2	<0.005	840	0.54	3	11	2.4	0.27	14	15
	1012-10	褐铁矿化绢英岩化花岗岩	200	<0.001	0.01	0.1	0.01	1	1	<0.005	846	1.13	2	11	8.0	0.36	10	11
	1012-12	弱绢英岩化碎裂花岗岩	218.5	<0.001	0.01	0.1	0.01	<1	1	<0.005	382	0.36	1	15	3.9	0.28	2	11
	1012-14	绢英岩化碎裂岩	268	0.006	0.02	0.3	0.15	4	1	<0.005	1 050	0.83	3	13	3.0	0.22	13	13
	1012-16	糜棱岩化花岗岩	446	0.001	0.01	0.1	0.01	<1	1	<0.005	75	0.24	<1	33	8.1	1.55	2	33
1021剖面（前花园村东300 m处公路旁）	1021-1	强钾化花岗岩	53	<0.001	0.09	1.1	0.03	<1	7	<0.005	148	0.44	1	19	5.4	0.61	1	18
	1021-2	褐铁矿化硅化花岗岩	58	0.447	0.44	29.4	2.45	1	75	<0.005	69	1.20	1	71	3.9	0.46	3	57
	1021-3	钾化绢英岩化花岗岩	70	0.009	0.03	1.3	0.11	<1	9	<0.005	97	0.83	2	19	6.5	0.29	2	15
	1021-5	绢英岩	301	0.001	0.09	0.3	0.25	<1	12	<0.005	83	0.30	1	25	6.4	0.21	4	41
	1021-8	钾化花岗岩	337	<0.001	0.09	1.4	0.06	<1	9	<0.005	47	0.42	2	81	5.1	0.20	4	182