Geological-Geochemical Modeling and Deep Exploration of Jiaochong Au Deposit in Tongling District of Anhui Province

doi:10.19657/j.geoscience.1000-8527.2018.02.13

Abstract

Abstract:

The Yangtze River’s middle and lower reaches are important Cu (Au) metallogenic belts in China. Tongling ore concentration area of Anhui Province is located in the belt and it is also a deep mineral exploration demonstration district in China. The study area (Jiaochong gold deposit) is located in a favorable prospecting zone at the southwest of Shizishan ore field in Tongling district. In this paper, the three-dimensional models of orebodies, Au-bearing rocks and lithologic strata in the study area are constructed using GOCAD modeling method, which is based on the middle section of -420 m to -820 m levels and drillhole dataset in Jiaochong gold deposit. Geological characteristics, the thermoelectricity features of pyrite as regularity of Au-bearing standard mineral were analyzed, and two prospecting targets were identified. The research results have an important reference for the deep mineral exploration and mining in the Yangtze River’s middle and lower reaches.

Key words: 3D geological modeling, GOCAD software, thermoelectricity of pyrite, space analysis, gold deposit, Tong-ling ore concentration area

CLC Number:

P618.51
P62

PANG Zong, WANG Gongwen, ZHANG Shuai, GUO Dongwei, CHEN Linjie, XIE Jiayu. Geological-Geochemical Modeling and Deep Exploration of Jiaochong Au Deposit in Tongling District of Anhui Province[J]. Geoscience, 2018, 32(02): 344-356.

Figures/Tables 21

Fig.1 Geological map of Jiaochong gold deposit in Tongling district, Anhui Province(after No.321 Geological Team, Anhui Bureau of Geology and Mineral Resources)

Fig.2 Types of skarn gold ores in Jiaochong gold deposit

Fig.3 Textures of skarn gold ores in Jiaochong gold deposit

Table 1 Division of the metallogenic stages in the Jiaochong skarn type gold deposit

Fig.4 Types of Au-bearing sulfide ores in Jiaochong gold deposit

Fig.5 Textures of Au-bearing sulfide ores in Jiaochong gold deposit

Table 2 Division of the metallogenic stages in Jiaochong Au-bearing sulfides gold deposit

Table 3 The information of 3D modeling database

钻孔/个	测斜数据/个	测井解译结果/个	岩性描述/条	中段图/张
74	438	1 071	1 027	10

Table 4 The geological borehole database field list

标题名	数据的主要字段
钻孔数据	钻孔编号、X坐标、Y坐标、高程H、终孔深度D
测斜数据	钻孔编号、测斜深度、天顶角、方位角、倾角
化验数据	钻孔编号、取样从、取样到、金品位、硫品位
岩性数据	钻孔编号、取样从、取样到、厚度、岩性描述

Fig.6 3D geological modeling steps based on GOCAD software

Fig.7 The synthetic 3D model of rock mass, ore body and boreholes in the study area

Table 5 Thermoeletric coefficients of pyrite grains from cores of various drillholes in Jiaochong gold deposit

标高/m	样号	N型电动势α/(μV·℃^-1)			频率/%	P型电动势α/(μV·℃^-1)			频率/%
标高/m	样号	最大值	最小值	平均值	频率/%	最大值	最小值	平均值	频率/%
-370.0	5.0	350.9	350.9	350.9	2	350.3	12.4	255.0	98
-370.0	7.0	153.6	3.4	60.1	6	324.4	43.2	236.7	94
-370.0	8.0	163.9	16.3	80.3	16	328.9	14.8	210.2	84
-370.0	10.0	295.3	25.7	154.2	54	247.4	12.1	115.2	46
-370.0	39.0	286.2	286.2	286.2	2	345.1	66.5	289.4	98
-370.0	41.0	167.2	78.9	121.8	12	343.6	108.2	259.1	88
-370.0	42.0	85.1	5.3	51.0	6	352.2	51.1	270.4	94
-579.6	k16-3	168.6	3.4	69.5	18	343.2	18.5	171.5	82
-580.0	49.0	323.3	5.1	152.7	44	318.1	25.3	186.6	56
-580.0	50.0	295.6	51.5	167.2	18	344.3	20.5	216.2	82
-580.0	51.0	286.0	8.5	128.7	46	348.0	45.2	211.3	54
-580.0	53.0	174.1	174.1	174.1	2	346.0	17.2	247.8	98
-580.0	55.0	298.8	62.3	148.6	14	349.0	27.6	148.6	86
-593.0	k19-2	73.3	5.2	43.0	8	265.5	25.6	121.4	92
-594.0	k32-27	249.1	12.1	104.8	14	330.5	10.2	162.3	86
-595.0	k17-5	207.8	11.7	89.3	42	317.1	3.3	125.4	58
-610.0	k19-6	106.6	12.3	48.7	30	254.3	13.8	78.6	70
-610.6	k16-2	253.9	43.9	122.6	94	307.8	238.7	278.2	6
-611.7	k12-11	93.1	6.7	43.6	14	331.1	41.1	248.2	86
-615.8	k11-1	197.7	34.0	107.7	84	175.9	11.3	105.6	16
-618.1	k16-1	147.7	3.4	43.7	38	274.9	10.0	83.2	62
-622.0	k12-12	112.4	11.4	60.3	38	292.2	16.4	133.2	62
-630.0	k12-13	120.0	9.7	65.8	18	251.2	11.1	102.2	82
-631.0	k28-1	284.2	1.8	135.2	52	344.5	17.4	177.3	48
-640.0	k30-3	215.3	23.6	83.0	16	309.4	12.8	219.7	84
-641.0	k32-17	298.1	7.0	136.1	38	339.7	10.3	128.0	62
-642.0	k30-2	250.0	16.8	128.9	20	321.4	20.2	192.7	80
-654.8	k11-14	104.6	4.9	42.2	32	311.6	13.0	103.4	68
-655.0	k19-5	10.9	10.8	10.9	4	303.5	54.7	186.7	96
-663.0	k11-3	—	—	—	—	332.2	1.7	244.0	100
-667.0	k11-15	225.0	225.0	225.0	2	340.7	20.2	249.3	98
-670.0	k11-4	300.8	55.4	168.6	12	306.6	25.2	230.7	88
-690.3	k11-5	224.5	39.7	103.3	46	251.7	20.0	142.8	54
-700.0	k32-21	330.5	20.8	165.2	24	333.3	76.0	238.7	76
-706.9	k11-10	103.5	103.5	103.5	2	313.3	11.6	231.6	98
-718.0	k11-9	218.3	40.5	101.8	6	330.5	75.2	251.9	94
-722.0	k11-6	128.6	95.5	112.0	4	334.5	61.2	253.2	96
-748.0	k32-24	305.5	58.0	152.2	80	293.0	3.3	152.4	20
-757.0	k32-18	196.9	3.5	77.6	10	310.6	1.6	232.6	90
-774.0	k32-32	298.5	77.2	170.2	18	339.6	24.0	248.0	82
-780.0	k12-9	281.8	16.1	80.9	16	321.5	14.5	226.7	84
-790.0	k32-19	333.9	88.7	213.8	10	335.6	78.4	201.6	90
-800.0	k32-7	156.7	51.8	98.5	8	334.5	33.8	223.5	92
-810.0	k32-23	269.5	6.8	156.7	18	322.6	1.7	194.2	82
-842.0	k32-31	292.8	4.2	169.6	58	311.8	15.4	146.8	42
-860.0	k32-40	332.2	102.5	218.0	84	275.4	57.2	147.1	16
标高/m	样号	N型电动势α/(μV·℃^-1)			频率/%	P型电动势α/(μV·℃^-1)			频率/%
标高/m	样号	最大值	最小值	平均值	频率/%	最大值	最小值	平均值	频率/%
-868.0	k32-36	340.7	3.4	197.0	44	337.9	20.3	172.4	56
-880.0	k11-13	174.5	5.2	96.9	32	326.4	29.5	193.5	68
-906.0	k21-4	44.7	44.7	44.7	2	325.9	10.2	230.6	98
-961.9	k12-3	183.1	16.6	114.4	56	313.8	19.7	164.2	44
-988.8	k11-17	—	—	—	—	337.3	156.6	272.6	100
-1 200.0	k10-3	174.3	116.9	145.6	4	337.3	49.2	230.9	96
-1 242.1	k32-13	—	—	—	—	309.5	18.5	238.5	100
-1 348.0	k10-11	283.8	20.0	128.0	52	326.7	62.3	202.4	48

Table 5 Thermoeletric coefficients of pyrite grains from cores of various drillholes in Jiaochong gold deposit

标高/m	样号	N型电动势α/(μV·℃^-1)			频率/%	P型电动势α/(μV·℃^-1)			频率/%
标高/m	样号	最大值	最小值	平均值	频率/%	最大值	最小值	平均值	频率/%
-370.0	5.0	350.9	350.9	350.9	2	350.3	12.4	255.0	98
-370.0	7.0	153.6	3.4	60.1	6	324.4	43.2	236.7	94
-370.0	8.0	163.9	16.3	80.3	16	328.9	14.8	210.2	84
-370.0	10.0	295.3	25.7	154.2	54	247.4	12.1	115.2	46
-370.0	39.0	286.2	286.2	286.2	2	345.1	66.5	289.4	98
-370.0	41.0	167.2	78.9	121.8	12	343.6	108.2	259.1	88
-370.0	42.0	85.1	5.3	51.0	6	352.2	51.1	270.4	94
-579.6	k16-3	168.6	3.4	69.5	18	343.2	18.5	171.5	82
-580.0	49.0	323.3	5.1	152.7	44	318.1	25.3	186.6	56
-580.0	50.0	295.6	51.5	167.2	18	344.3	20.5	216.2	82
-580.0	51.0	286.0	8.5	128.7	46	348.0	45.2	211.3	54
-580.0	53.0	174.1	174.1	174.1	2	346.0	17.2	247.8	98
-580.0	55.0	298.8	62.3	148.6	14	349.0	27.6	148.6	86
-593.0	k19-2	73.3	5.2	43.0	8	265.5	25.6	121.4	92
-594.0	k32-27	249.1	12.1	104.8	14	330.5	10.2	162.3	86
-595.0	k17-5	207.8	11.7	89.3	42	317.1	3.3	125.4	58
-610.0	k19-6	106.6	12.3	48.7	30	254.3	13.8	78.6	70
-610.6	k16-2	253.9	43.9	122.6	94	307.8	238.7	278.2	6
-611.7	k12-11	93.1	6.7	43.6	14	331.1	41.1	248.2	86
-615.8	k11-1	197.7	34.0	107.7	84	175.9	11.3	105.6	16
-618.1	k16-1	147.7	3.4	43.7	38	274.9	10.0	83.2	62
-622.0	k12-12	112.4	11.4	60.3	38	292.2	16.4	133.2	62
-630.0	k12-13	120.0	9.7	65.8	18	251.2	11.1	102.2	82
-631.0	k28-1	284.2	1.8	135.2	52	344.5	17.4	177.3	48
-640.0	k30-3	215.3	23.6	83.0	16	309.4	12.8	219.7	84
-641.0	k32-17	298.1	7.0	136.1	38	339.7	10.3	128.0	62
-642.0	k30-2	250.0	16.8	128.9	20	321.4	20.2	192.7	80
-654.8	k11-14	104.6	4.9	42.2	32	311.6	13.0	103.4	68
-655.0	k19-5	10.9	10.8	10.9	4	303.5	54.7	186.7	96
-663.0	k11-3	—	—	—	—	332.2	1.7	244.0	100
-667.0	k11-15	225.0	225.0	225.0	2	340.7	20.2	249.3	98
-670.0	k11-4	300.8	55.4	168.6	12	306.6	25.2	230.7	88
-690.3	k11-5	224.5	39.7	103.3	46	251.7	20.0	142.8	54
-700.0	k32-21	330.5	20.8	165.2	24	333.3	76.0	238.7	76
-706.9	k11-10	103.5	103.5	103.5	2	313.3	11.6	231.6	98
-718.0	k11-9	218.3	40.5	101.8	6	330.5	75.2	251.9	94
-722.0	k11-6	128.6	95.5	112.0	4	334.5	61.2	253.2	96
-748.0	k32-24	305.5	58.0	152.2	80	293.0	3.3	152.4	20
-757.0	k32-18	196.9	3.5	77.6	10	310.6	1.6	232.6	90
-774.0	k32-32	298.5	77.2	170.2	18	339.6	24.0	248.0	82
-780.0	k12-9	281.8	16.1	80.9	16	321.5	14.5	226.7	84
-790.0	k32-19	333.9	88.7	213.8	10	335.6	78.4	201.6	90
-800.0	k32-7	156.7	51.8	98.5	8	334.5	33.8	223.5	92
-810.0	k32-23	269.5	6.8	156.7	18	322.6	1.7	194.2	82
-842.0	k32-31	292.8	4.2	169.6	58	311.8	15.4	146.8	42
-860.0	k32-40	332.2	102.5	218.0	84	275.4	57.2	147.1	16
标高/m	样号	N型电动势α/(μV·℃^-1)			频率/%	P型电动势α/(μV·℃^-1)			频率/%
标高/m	样号	最大值	最小值	平均值	频率/%	最大值	最小值	平均值	频率/%
-868.0	k32-36	340.7	3.4	197.0	44	337.9	20.3	172.4	56
-880.0	k11-13	174.5	5.2	96.9	32	326.4	29.5	193.5	68
-906.0	k21-4	44.7	44.7	44.7	2	325.9	10.2	230.6	98
-961.9	k12-3	183.1	16.6	114.4	56	313.8	19.7	164.2	44
-988.8	k11-17	—	—	—	—	337.3	156.6	272.6	100
-1 200.0	k10-3	174.3	116.9	145.6	4	337.3	49.2	230.9	96
-1 242.1	k32-13	—	—	—	—	309.5	18.5	238.5	100
-1 348.0	k10-11	283.8	20.0	128.0	52	326.7	62.3	202.4	48

Fig.8 The relationship between thermoelectric coefficient and temperature of pyrite from Jiaochong gold deposit

Fig.9 The histogram of thermoelectric coefficient values of pyrite from Jiaochong gold deposit(from -337.7 to -370 m, -591 to -596 m,-600 to -700 m and the overall thermoelectric coefficient of space distribution as an example)

Table 6 The thermoelectricity of different levels

标高/m	N型黄铁矿出现率/%	$α - N$ / (μV·℃^-1)	P型黄铁矿出现率%	$α - P$ / (μV·℃^-1)
-337.7~-370	6.30	117.80	93.70	254.14
-579~-596	22.67	144.50	77.33	203.60
-600~-700	29.30	83.51	70.70	188.18
-700~-800	18.10	114.23	81.90	225.00
-800~-885	33.30	153.50	66.70	203.30
-906~-988	28.00	107.00	72.00	242.00
-1 191~-1 348	11.70	128.00	88.30	243.00

Table 6 The thermoelectricity of different levels

标高/m	N型黄铁矿出现率/%	$α - N$ / (μV·℃^-1)	P型黄铁矿出现率%	$α - P$ / (μV·℃^-1)
-337.7~-370	6.30	117.80	93.70	254.14
-579~-596	22.67	144.50	77.33	203.60
-600~-700	29.30	83.51	70.70	188.18
-700~-800	18.10	114.23	81.90	225.00
-800~-885	33.30	153.50	66.70	203.30
-906~-988	28.00	107.00	72.00	242.00
-1 191~-1 348	11.70	128.00	88.30	243.00

Fig.10 The scatter diagram of frequency of P-type pyrite and dispersion

Fig.11 The distribution of sampling locations

Fig.12 The plane map and vertical section showing distribution of Ⅰore body

Fig.13 Prospecting line profile map of Jiaochong gold deposit

Fig.14 The interpolation map of thermoelectric coefficient dispersion (a), frequency of P-type pyrite(b), P-type pyrite forming temperature (c)

Fig.15 The 3D model of prospecting target area in Jiaochong gold deposit

References 23

[1]	李瑞喜, 王功文, 张寿庭, 等. 地学信息三维定量化提取与集成——以河南栾川钼矿区为例[J]. 地质通报, 2014, 33(6):883-893.
[2]	朱彦彦, 王功文, 张寿庭, 等. 河南栾川钼、多金属矿集区三维地质建模[J]. 西北地质, 2012, 45(S1):190-193.
[3]	侯满堂. 陕西镇安太白庙金矿黄铁矿热电性特征研究及其应用[J]. 黄金, 2000, 21(7):5-10.
[4]	要梅娟, 申俊峰, 李胜荣, 等. 河南嵩县前河金矿黄铁矿的热电性、热爆特征及其与金矿化的关系[J]. 地质通报, 2008, 27 (5):649-656.
[5]	戢兴忠, 杨立强, 王中亮. 胶东新城金矿床黄铁矿热电性特征[J]. 现代地质, 2013, 27(1):37-45.
[6]	许杰辉, 葛文胜, 邢德超, 等. 新疆东天山康古尔金矿黄铁矿热电性与微量元素特征及其地质意义[J]. 现代地质, 2015, 29(3):542-552.
[7]	储国正, 杜卫国, 许卫. 安徽深部矿产资源勘查的思考[C]// 安徽省地质学会.加强地质工作促进社会经济和谐发展——2007年华东六省一市地学科技论坛论文集. 合肥: 合肥工业大学出版社, 2007:103-108.
[8]	杜静国, 杜杨松, 曹毅, 等. 安徽铜陵焦冲闪长玢岩岩体的年代学和地球化学特征及其成矿意义[J]. 矿物岩石地球化学通报, 2015, 34(4):804-811.
[9]	王功文, 郭远生, 杜杨松, 等. 基于GIS的云南普朗斑岩铜矿床三维成矿预测[J]. 矿床地质, 2007, 26(6):651-658.
[10]	陈建平, 于淼, 于萍萍, 等. 重点成矿带大中比例尺三维地质建模方法与实践[J]. 地质学报, 2014, 88(6):1187-1195.
[11]	孔亮, 王功文, 汪程. 基于Gocad三维地质建模与深部成矿预测——以河南灵宝市灵金一矿为例[J]. 矿物学报, 2015, 35(S1):866-867.
[12]	刘冲昊, 刘家军, 王建平, 等. 陕西省铧厂沟金矿床主矿带黄铁矿热电性特征及其地质意义[J]. 地学前缘, 2013, 20(4):264-272.
[13]	申峻峰, 申旭辉, 刘倩. 几种天然半导体矿物热电特性对地震电场变化的启示意义[J]. 地学前缘, 2009, 16(4):313-319.
[14]	申俊峰, 李胜荣, 马广钢, 等. 玲珑金矿黄铁矿标型特征及其大纵深变化规律与找矿意义[J]. 地学前缘, 2013, 20(3): 55-75.
[15]	陈海燕, 李胜荣, 张秀宝, 等. 胶东金青顶金矿床黄铁矿热电性标型特征及其地质意义[J]. 矿床地质, 2010, 29(6):1125-1137.
[16]	于洪军, 申俊峰, 王磊, 等. 玲珑金矿黄铁矿热电性与微量元素标型及深部金矿化评价[J]. 地质与勘探, 2011, 47(4): 615-623.
[17]	曾祥涛, 王建平, 刘必政, 等. 陕西省双王金矿床五号矿体黄铁矿标型特征研究[J]. 地质与勘探, 2012, 48(1):76-84.
[18]	Андреев Б С. Пирит золоторудных месторождений[M].Москва:Изд.Наука, 1992:51-63.
[19]	张方方, 王建平, 刘冲昊, 等. 陕西双王金矿黄铁矿晶体形态和热电性特征对深部含矿性的预测[J]. 中国地质, 2013, 40(5):1634-1643.
[20]	曹烨, 李胜荣, 敖翀, 等. 黄铁矿热电性特征在冀西石湖金矿床中的应用[J]. 中国地质, 2008, 35(4):746-753.
[21]	刘平, 邱朝霞. 某些金矿床中黄铁矿热电系数值的分布特点及其意义[J]. 矿物学报, 1991, 11(1):60-70.
[22]	刘坤, 刘家军, 吴杰, 等. 甘肃马坞金矿床8号矿体黄铁矿热电性特征及其地质意义[J]. 现代地质, 2014, 28(4):711-720.
[23]	贾文娟, 王功文, 韩江伟, 等. 河南栾川鱼库Mo矿床黄铁矿热电性特征及成矿规律[J]. 现代地质, 2016, 30(6):1209-1218.