广西贵港六梅金矿的成因类型及找矿意义

doi:10.11872/j.issn.1005-2518.2020.04.050

Abstract

Abstract:

Liumei gold deposit is located in the northeast of Dapingtianshan stock，Guigang，Guangxi Province.According to mineral composition and pulse cutting relation,the deposit hydrothermal activity process is divided into four stages:（1）quartz-pyrite stage；（2）pyrite arsenopyrite-quartz stage；（3）galena-sphalerite-chalcopyrite-tennantite-ankerite-quartz stage；（4）quartz-ankerite stage.The second stage as the main metal-logenic stage.The main gold carriers are arsenopyrite and pyrite. EPMA analysis shows that Au mainly exists in the form of “invisible” submicroscopic-supermicroscopic inclusion gold.Fluid inclusion test shows that the inclusions in quartz or calcite are mainly gas-liquid two-phase，the average temperature in the main metallogenic stage is about 181 ℃，the average salinity [w（NaCl）] is 9.36%，and the density is 0.946 g/cm³, indicating that the ore-forming fluid is low-temperature,low-salinity,low-density fluid.The hydrogen and oxygen isotopic composition (δD value between -73‰~-57‰， $δ 18 O H 2 O$ value between 2.3‰~6.1‰) indicates that the ore-forming fluid may be related to the magmatic hydrothermal fluid and was mixed by meteoric precipitation in the later period.The value of the gold-bearing δ³⁴S is between -0.8‰ and 0.5‰，indicating that the ore-forming material comes from magmatic rock.These features indicate that Liumei gold deposit is very different from typical carlin-type gold deposits，especially it is lack of characteristic of the low temperature carlin-type gold mineral combination (orpiment-realgar-cinnabar)，but instead contain more base metals mineral galena-sphalerite-chalcopyrite)，so it is closer to related to magmatic activities of distal low temperature hydrothermal deposit.Based on the spatial distribution characteristics of regional ore deposits and rock masses，the metallogenic model of Dapingtianshan magmatic hydrothermal system for porphyry gold and copper deposits (Longtoushan gold deposit)，skarn-type silver lead and zinc deposits (Touzha Ag-Pb-Zn deposit) and distal low temperature hydrothermal gold deposits (Liumei gold deposit) is proposed.The model implies that there should be intermediate temperate hydrothermal vein and skarn type silver-lead-zinc deposits deep in Liumei gold deposit and in the direction of Dapingtianshan rock mass.The model of magmatic hydrothermal metallogenic system established in this paper has important guiding significance for similar ore deposits in Dayaoshan area.

Key words: magmatic hydrothermal metallogenic system, arsenopyrite, pyrite, invisible gold, distal low temperature magmatic-hydrothermal deposit, Liumei gold deposit, Guigang City,Guangxi

CLC Number:

P618.51

Gang CHEN, Maohong CHEN, Kezhong MA, Rui GE, Shenxiang GUO, Qiqiang WU, Qisheng YUAN. Genetic Types and Prospecting Significance of Liumei Gold Deposit，Guigang，Guangxi Province，China[J].Gold Science and Technology, 2020, 28(4): 479-496.

Figures/Tables 20

Fig.1

Fig.2

Fig.3

Fig.4

Table 1

Fig.5

Fig.6

Fig.7

Table 2

EPMA analysis results of arsenopyrite"

样品特征	样品编号	元素含量/%											w（S）/ w（As）
样品特征	样品编号	As	Au	Pb	Sb	Ag	S	Sn	Fe	Cu	Zn	Total	w（S）/ w（As）
自形毒砂	LM13-1-8	43.630	0.046	0.174	0	0	22.88468	0	33.33421	0.019	0	100.0879	1.226
	LM13-1-9	43.140	0	0	0.000947	0	23.66006	0	34.33910	0.004	0.008	101.1481	1.282
	LM13-1-10	42.600	0.025	0.076	0.022720	0	23.89940	0	34.00003	0	0.019	100.6462	1.311
	LM1-3-2-4	45.380	0	0.111	0.004733	0	21.66721	0	33.18569	0.006	0	100.3546	1.116
	LM1-3-2-5	44.493	0	0	0	0	21.92732	0	33.41824	0.017	0.015	99.8706	1.152
	LM1-3-2-6	44.653	0.039	0.165	0	0	21.70468	0	33.51693	0.001	0	100.0796	1.136
	LM1-3-2-9	45.728	0	0	0	0	21.57017	0.008	33.59182	0	0.034	100.9320	1.102
	LM1-3-2-10	45.483	0.097	0.102	0	0.002	21.65028	0	33.25978	0	0	100.5941	1.112
	LM1-2-1-8	45.247	0	0.118	0.038813	0.016	21.35940	0	33.29703	0	0	100.0762	1.103
	LM1-2-1-9	46.717	0.045	0.089	0.017987	0	21.78985	0	33.07542	0	0	101.7342	1.090
	LM1-2-1-10	44.475	0	0.135	0.098453	0	22.50380	0	33.43422	0	0.005	100.6515	1.182
	LM3-5-1-6	45.879	0.087	0.072	0.029347	0.009	21.05391	0.027	33.60449	0	0.003	100.7647	1.072
	LM3-5-1-7	44.463	0.06	0.072	0.012307	0	21.63743	0	34.91733	0	0.018	101.1799	1.137
	LM3-5-1-8	45.515	0.064	0.009	0	0.001	21.79380	0.017	33.77152	0	0	101.1716	1.119
	LM3-5-1-9	45.406	0	0.175	0.028400	0.001	22.27248	0	33.95701	0.016	0.015	101.8711	1.146
	LM12-1-1	44.974	0.165	0.072	0.023667	0	22.58896	0	33.77521	0	0.030	101.6292	1.174
	LM12-1-2	44.830	0	0.102	0	0.004	22.43864	0.001	33.63956	0	0	101.0148	1.170
	LM12-1-3	44.354	0	0.203	0.039760	0.005	22.92918	0.009	33.02530	0	0.017	100.5825	1.208
	LM12-1-4	45.077	0.045	0.093	0.079520	0	22.69677	0	33.55558	0	0.015	101.5619	1.176
	LM12-1-5	44.652	0.163	0.017	0	0.023	22.46732	0	34.41808	0	0	101.7400	1.176
	LM12-2-6	45.003	0.060	0.03	0.015147	0	22.64237	0	33.40548	0	0.002	101.1579	1.176
	LM12-2-7	45.708	0.070	0	0.049227	0	21.52699	0	33.29447	0	0	100.6484	1.100
	LM12-2-8	46.384	0.050	0.098	0.019880	0.021	21.19248	0.001	33.91321	0	0.034	101.7137	1.068
	LM12-2-9	45.054	0.104	0	0.033133	0.005	21.96193	0.052	34.38637	0.006	0.013	101.6150	1.139
	LM12-2-10	42.563	0.010	0.11	0.007573	0.011	22.76699	0	34.66572	0.019	0	100.1529	1.250
	LM3-2-1-4	44.666	0.163	0.06	0	0	21.65435	0	34.09677	0.024	0.007	100.6711	1.133
	LM3-2-1-5	44.454	0.059	0	0	0.025	22.63138	0	33.67913	0	0.005	100.8535	1.190
	LM3-2-1-6	44.800	0.097	0	0	0	21.98072	0.016	34.18471	0	0.049	101.1274	1.146
	LM3-2-1-7	45.185	0.153	0.138	0	0.008	21.65534	0	33.96388	0.002	0.003	101.1082	1.120
他形毒砂	LM11-1-3	41.141	0.082	0.181	0.614387	0	22.61841	0	34.85795	0.016	0.052	99.5627	1.285
	LM11-1-4	44.326	0.003	0	0.210160	0	22.68984	0	34.17787	0.002	0	101.4089	1.196
	LM11-1-5	42.231	0	0.148	0.559480	0.003	21.14863	0	34.95566	0	0	99.0458	1.170

Table 2

Fig.8

Table 3

EPMA analysis results of pyrite"

样品特征	样品编号	测点	元素含量/%
样品特征	样品编号	测点	As	Au	Pb	Sb	Ag	S	Sn	Fe	Cu	Zn	Total
粒状黄铁矿	LM11-1	1	5.869	0.106	0.064	0	0	49.12803	0	45.63346	0.079	0	100.8795
	LM11-1	2	1.298	0.072	0.357	0.008520	0.016	51.78429	0.014	46.87734	0	0	100.4271
	LM3-2-1	1	2.625	0.048	0.432	0.014200	0.008	52.15242	0	46.21192	0.015	0.020	101.5265
		2	1.813	0.026	0.350	0.004733	0	52.54407	0	45.87383	0	0.020	100.6316
		3	2.797	0.043	0.412	0.023667	0.034	52.17616	0.001	46.29106	0	0.015	101.7929
	LM1-3-2	1	4.448	0	0.227	0	0	50.81034	0	45.95591	0.023	0	101.4642
		2	4.502	0.024	0.255	0	0	50.93495	0	46.04581	0.046	0	101.8078
		3	4.516	0.021	0.297	0.005680	0	49.71847	0	45.80739	0.012	0	100.3775
		7	3.886	0.005	0.272	0.004733	0	51.33352	0.011	46.13863	0	0.020	101.6709
		8	3.163	0	0.419	0.008520	0	51.71033	0.003	46.14352	0	0	101.4474
	LM3-5-1	1	3.611	0	0.205	0.000947	0.013	51.02297	0	46.29790	0.062	0.018	101.2308
		2	2.816	0.011	0.333	0	0	51.63418	0	47.07764	0.018	0	101.8898
		3	3.761	0.018	0.223	0	0	50.86968	0.008	46.63599	0	0	101.5157
		4	2.658	0.072	0.324	0.008520	0.004	51.54220	0	46.54023	0.007	0	101.156
		5	2.457	0.045	0.352	0.014200	0.025	50.74506	0.010	46.49724	0.002	0	100.1475
	LM12-1-	6	6.083	0.018	0.510	0	0.002	48.52177	0	45.29929	0.019	0	100.4531
		7	3.922	0	0.237	0	0	50.78363	0.021	46.46304	0	0.011	101.4377
		8	3.892	0	0.464	0.001893	0	50.75693	0	45.68427	0.046	0.017	100.8621
		9	2.640	0.018	0.226	0	0	50.80045	0	46.74054	0.010	0.025	100.4600
		10	4.105	0	0.318	0.009467	0	49.69078	0	45.85234	0.018	0.021	100.0146
	LM12-2	1	7.196	0	0.285	0.007573	0	47.49419	0	45.31101	0.006	0.012	100.3118
		2	4.332	0	0.456	0	0.003	50.62638	0	46.54707	0.015	0	101.9794
		3	2.389	0.005	0.335	0	0	51.92297	0	46.87929	0.034	0	101.5653
		4	4.226	0.047	0.266	0	0	49.60078	0	45.61196	0.044	0	99.7957
		5	3.905	0.023	0.283	0	0	50.31781	0	46.66530	0.025	0	101.2191
环带	LM13-1	1	4.934	0.083	0.288	0.018933	0	49.84407	0.017	45.16933	0.048	0.015	100.4173
环带		2	6.694	0	0.287	0.042600	0	48.89265	0	44.89280	0.040	0.039	100.8881
环带		3	5.672	0.007	0.332	0	0.002	49.25858	0	45.31101	0.029	0	100.6116
核部		4	3.164	0.065	0.303	0.017987	0.010	51.18418	0.023	45.70284	0.003	0.015	100.488
核部		5	0.051	0.042	0.068	0	0.020	53.46286	0	46.55000	0.014	0.059	100.2669
核部		6	0.106	0.103	0.250	0	0	53.45000	0.021	45.75715	0.014	0	99.70115
粒状黄铁矿		7	5.711	0.039	0.311	0.017987	0	49.41089	0.014	45.31687	0.079	0.012	100.9117
1-7号点位由边部到核部，再由核部到边部，4号点为核部	LM1-2-1	1	4.573	0.018	0.196	0.006627	0	51.02891	0	45.04445	0	0	100.8670
		2	3.895	0.01	0.303	0	0	51.06847	0	45.45238	0	0	100.7288
		3	3.378	0.064	0.236	0	0	51.32561	0	45.67071	0	0	100.6743
		4	3.737	0	0.408	0	0	51.45022	0	45.83158	0	0.016	101.4428
		5	3.935	0.018	0.209	0.000947	0	51.36616	0.017	45.85839	0.020	0.021	101.4455
		6	3.684	0.071	0.349	0	0	50.92506	0.011	45.53186	0.005	0	100.5769
		7	3.797	0.026	0.362	0	0.001	51.53330	0.032	45.84595	0	0.022	101.6192
1号点到10号点依次从边部到核部	LM1-3-1	1	3.397	0.109	0.425	0.044493	0.009	50.93693	0	45.57874	0.020	0.027	100.5472
		2	2.638	0.005	0.214	0	0	51.86165	0.018	46.20801	0	0	100.9447
		3	4.457	0	0.183	0	0	50.32363	0	45.67645	0.040	0.008	100.6881
		4	4.013	0.039	0.415	0	0	50.55803	0.002	45.24221	0.019	0	100.2882
		5	3.415	0.007	0.308	0	0	50.70836	0	46.12202	0.009	0.010	100.5794
		6	4.668	0.029	0.057	0.031240	0.017	49.35451	0	45.60219	0.011	0	99.7699
		7	4.721	0.037	0.283	0.017040	0	51.22408	0	44.39056	0	0	100.6727
		8	0.088	0	0.215	0	0	53.29077	0	46.82359	0	0	100.4174
		9	0.065	0.017	0.354	0	0	53.77341	0	46.65260	0	0	100.8620
		10	0.031	0.051	0.405	0	0.016	53.73088	0	46.26468	0	0	100.4986

Table 3

Fig.9

Table 4

Fig.10

Table 5

Hydrogen and oxygen isotopic compositions of Liumei gold deposit"

成矿期次	样品编号	样品名称	δ¹⁸O_V-SMOW‰	$δ 18 O H 2 O$ ‰	$δ D H 2 O$ ‰
Ⅱ阶段	LMJK-2	石英	17.6	6.1	-57
	LMJK-3	石英	17.3	5.8	-59
	LMJK-6	石英	17.0	5.5	-61
Ⅳ阶段	LMJK-4	石英	14.2	2.7	-71
Ⅳ阶段	LMJK-7	石英	13.8	2.3	-73

Table 5

Fig.11

Table 6

Fig.12

Table 7

Fig.13

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矿体编号	长度/m	厚度/m	产状	金品位/（×10^-6）
矿体编号	长度/m	厚度/m	产状	最高	最低	平均
（20）-1	545	2.46	84°∠85°	41.9	1.71	7.34
（20）-2	328	2.91	93°∠88°	6.83	1.74	4.30
（20）-3	325	3.13	254°∠77°	8.21	1.88	4.23
（20）-4	75	0.56	85°∠78°	3.26	-	3.26
（20）-5	30	2.53	284°∠85°	5.89	1.25	2.43
（20）-6	130	1.78	80°∠75°	3.42	2.95	3.26
（20）-7	123	0.85	106°∠75°	1.50	-	1.50
（20）-8	95	0.89	100°∠82°	8.94	1.56	4.30

成矿阶段	数量/组	均一温度/℃		平均盐度 [w（NaCl）]/%	平均密度 /(g·cm^-3)
成矿阶段	数量/组	范围	均值	平均盐度 [w（NaCl）]/%	平均密度 /(g·cm^-3)
Ⅰ	7	233~244	234	14.75	0.888
Ⅱ	66	161~198	181	9.36	0.946
Ⅳ	5	126~135	129	4.15	0.993

矿床类型	矿物组合	元素组合	金的赋存状态	蚀变	成矿流体	物质来源	资料来源
六梅金矿	主要为黄铁矿和毒砂，次要为黄铜矿、方铅矿、闪锌矿和辉锑矿	Au-As-Cu-Pb-Zn-Sb	不可见金	硅化、绢云母化，石英—铁白云石—绢云母脉	均一温度范围集中于140~260 ℃。为中低温、低盐度、低密度流体。H-O同位素示踪流体来自于岩浆水和大气降水混合	S同位素表明成矿物质来源于岩浆岩	本文
卡林型金矿	主要为黄铁矿和毒砂，次要为雌黄、雄黄、辉锑矿、辰砂、萤石和重晶石	Au-As-Sb-Hg-Tl	不可见金	去碳酸化、硫化物化、硅化、泥化	均一温度范围集中于220~320 ℃。为中低温、低盐度、低密度流体。H-O同位素示踪具有变质流体和盆地流体的性质	S同位素示踪显示复杂的来源，也有显示岩浆来源的	[29-34]

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Genetic Types and Prospecting Significance of Liumei Gold Deposit，Guigang，Guangxi Province，China

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成矿期次	样号	样品名称	δ³⁴S_V-CDT/‰
Ⅱ阶段	LM-1-3	毒砂	0.1
	LM-3-1	毒砂	-0.1
	LM-3-5	毒砂	0.2
	LM-7	毒砂	0.3
	LM-8	毒砂	-0.1
	LM-9	毒砂	-0.2
	LM-10	毒砂	0.3
	LM-1-3-A	黄铁矿	-0.5
	LM-3-1-A	黄铁矿	0.0
	LM-7-A	黄铁矿	0.0
	LM-8-A	黄铁矿	0.5
	LM-9-A	黄铁矿	-0.8