坦桑尼亚PL7184金矿床矿石特征与金的赋存状态

doi:10.11872/j.issn.1005-2518.2019.06.826

Abstract

Abstract:

The greenstone belt around Victoria Lake in Northwest Tanzania is one of the famous gold metallogenic belts in the world，about 90% of the gold deposits are related to the BIF type gold deposits，but its overall research level is low，especially lack of researching on ore characteristics，gold-bearing properties，gold minerals and occurrence of gold，etc.Based on the study of ore characteristics and gold occurrence state of the greenstone belt gold deposit around Victoria Lake in Tanzania，the genesis of the deposit was comprehensively analyzed to guide ore processing and metallurgical process.By means of field observation，optical thin section identification，electron microscopy and electron probe analysis，the ore characteristics and occurrence of gold in PL7184 gold deposit have been systematically studied and analyzed.The results show that the PL7184 gold deposit belongs to altered rock type gold deposit controlled by ductile shear zone.It is a subclass of greenstone belt type gold deposit.Its gold orebodies mainly occur in shear fracture zone between banded iron-bearing formation rock and acid volcanic sedimentary rock.The gold ores are divided into four natural types in this area，they are dense disseminated pyrrhotite，sparse disseminated pyrrhotite，veinlet pyrrhotitand star-bearing point pyrrhotite.Among them，the dense disseminated gold pyrrhotite ore has the richest gold content，accompanied by strong pyrrhotitization，silicification and arsenopyrite alteration.The primary ore mineral symbiotic assemblages in this area are mainly silver-gold deposit+natural gold（small amount）+pyrite+quartz+chlorite+arsenopyrite+pyrrhotite.Some of the marenatural gold+pyrite+quartz+chlorite，natural gold（small amount）+pyrite+quartz.The content of Au in gold minerals is 65.63% to 85.36%，with an average of 74.77%.The content of Ag is 12.25% to 33.79%，with an average of 24.27%.The ratio of w(Ag)/w(Au) is 0.14 to 0.51，mainly concentrated in 0.25 to 0.34.The main types are silver-gold deposits，with a small amount of natural gold.The fineness of silver-gold deposits is 656.3‰ to 791.8‰，with an average of 734.5‰，and the fineness of natural gold is relatively high，the highest is 853.6‰.The occurrence of gold minerals is mainly intergranular gold，followed by encapsulated gold and fissure gold.Meanwhile，the particle size of gold minerals is mainly medium-fine grains，and the particle size is 0.01 mm to 0.07 mm in more.

Key words: gold deposit, ore characteristics, native gold, electrum, the occurence status of gold, Tanzania

CLC Number:

P618.51

Kechuan ZHANG,Qingwei LUO,Aiwen YI,Deyu QIN,Cheng QUAN,Jibing YANG. Ore Characteristics and Gold Occurrence Status of PL7184 Gold Deposit in Tanzania[J].Gold Science and Technology, 2019, 27(6): 826-834.

Figures/Tables 8

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References 19

1	崔小军，王建光，彭俊，等.坦桑尼亚维多利亚湖东部绿岩带金矿床地质特征及成因浅析[J].地质与勘探，2014，50（4）：789-794.
	Cui Xiaojun，Wang jianguang，Peng Jun，et al.Geological characteristics and matallogeny of the gold deposits in the East Victoria greenstone belt of Tanzania[J].Geology and Exploration，2014，50（4）：789-794.
2	Borg G，Krogh T.Isotopic age data of single zircons from the Archean Sukuma land greenstone belt，Tanzania［J］.Journal of African Earth Sciences，1999，29（2）：301-312.
3	任军平，王杰，刘晓阳，等.坦桑尼亚Nzega绿岩带Golden Pride金矿床研究进展[J].地质调查与研究，2013，36（1）：47-53.
	Ren Junping，Wang Jie，Liu Xiaoyang，et al.New progress on the Golden Pride gold deposit research of the Nzega Greenstone Belt in Tanzania[J].Geological Survey and Research，2013，36（1）：47-53.
4	杨东潮，白德胜，曹琼.坦桑尼亚太古宙绿岩带中BIF型金矿床的勘查标志——以Maheiga金矿床为例[J].黄金科学技术，2013，21（4）：1-8.
	Yang Dongchao，Bai Desheng，Cao Qiong.The BIF gold mine exploration criteria in greenstone belt of Archaean，Tanzania：Taking Maheiga gold mine for example[J].Gold Science and Technology，2013，21（4）：1-8.
5	Borg G，吴礼道.坦桑尼亚盖塔和朱比利里夫太古代条带状铁建造中金矿床的成因探讨[J].国外火山地质，1992（1）：32-43.
	Borg G，Wu Lidao.Discussion on the genesis of gold deposits in Archean BIF in Getia and Jubilee Reef of Tanzania[J].International Volcanology，1992（1）：32-43.
6	张同中，白德胜，庞绪成.坦桑尼亚金矿勘查中的地球物理综合找矿研究[J].河南理工大学学报（自然科学版），2010，29（1）：45-50.
	Zhang Tongzhong，Bai Desheng，Pang Xucheng.Study of comprehensive geophysical exploration ore in Tanzania's gold ore survey[J].Journal of Henan Polytechnic University（Natural Science），2010，29（1）：45-50.
7	张雷，贾晓东，陈丽娜，等.坦桑尼亚维多利亚湖Maheiga金矿勘查区成矿地质特征及矿床成因[J].资源导刊·地球科技版，2012（3）：19-21.
	Zhang Lei，Jia Xiaodong，Chen Lina，et al.Metallogenic geological characteristics and genesis of Maheiga gold exploration mine in the Victoria Lake，Tanania[J].Resource Guide（Earth Science and Technology），2012（3）：19-21.
8	刘军，朱谷昌.坦桑尼亚汉德尼金矿床地质特征与找矿方向分析[J].地质与勘探，2012，48（1）：177-184.
	Liu Jun，Zhu Guchang.Geological characteristics of the Handeni gold deposit in Tanzania and its ore-search direction[J].Geology and Exploration，2012，48（1）：177-184.
9	谭代卫，付芝康，郭磊，等.坦桑尼亚辛阳嘎地区PL7017/2011研究区综合找矿初步研究[J].贵州大学学报（自然科学版），2013，30（3）：52-55.
	Tan Daiwei，Fu Zhikang，Guo Lei，et al.Preliminary synthetic geological exploration study on PL7017/2011 Shinyanga District，Tanzania[J].Journal of Guizhou University（Natural Sciences），2013，30（3）：52-55.
10	李水平，袁杨森，司建涛，等.坦桑尼亚姆瓦莫拉金矿综合找矿模式[J].中国地质，2016，43（4）：1409-1419.
	Li Shuiping，Yuan Yangsen，Si Jiantao，et al.An integrated ore prospecting model for the Mwamola gold deposit，Tanzania[J].Geology in China，2016，43（4）：1409-1419.
11	张克川，义爱文，杨继兵，等.坦桑尼亚芒果金矿成矿地质特征及金赋存状态研究[J].矿产勘查，2018，9（4）：761-765.
	Zhang Kechuan，Yi Aiwen，Yang Jibing，et al.Study on geological characteristics and gold occurrence of Manangu gold mine in Tanzania[J].Mineral Exploration，2018，9（4）：761-765.
12	崔小军，彭俊，李水平，等.坦桑尼亚绿岩带构造蚀变岩型金矿床找矿方法[J].物探与化探，2015，39（4）：722-727.
	Cui Xiaojun，Peng Jun，Li Shuiping，et al.The prospecting method for tectonic rock type gold deposits in the greenstone belt，Tanzania[J].Geophysical and Geochemical Exploration，2015，39（4）：722-727.
13	袁杨森，张雷，陈璐璐，等.坦桑尼亚马嘿嘎金矿床地质特征和找矿方法研究[J].矿产勘查，2016，7（5）：844-854.
	Yuan Yangsen，Zhang Lei，Chen Lulu，et al.Geological characteristics and prospecting method of Maheiga gold deposit in Tanzania[J].Mineral Exploration，2016，7（5）：844-854.
14	程华，李水平，袁杨森，等.坦桑尼亚条带状铁建造和辉绿岩磁异常特征的识别与找矿研究[J].地球物理学进展，2015，30（6）：2623-2632.
	Cheng Hua，Li Shuiping，Yuan Yangsen，et al.Identify magnetic anomaly characteristics of the banded iron formatio and diabase in Tanzania and ore-prospecting[J].Progress in Geophysics，2015，30（6）：2623-2632.
15	程华，李水平，邵江波，等.坦桑尼亚Maheiga金矿区航空、地面磁力异常特征与找矿研究[J].黄金科学技术，2015，23（4）：24-29.
	Cheng Hua，Li Shuiping，Shao Jiangbo，et al.The air and ground magnetic anomaly characteristics and prospetting research on the Meheiga gold field in Tanzania[J].Gold Science and Technology，2015，23（4）：24-29.
16	许涛，苏妤芸，廖占丕，等.贵州水银洞含金黄铁矿中金的赋存形式探讨[J].黄金科学技术，2013，21（5）：86-92.
	Xu Tao，Su Yuyun，Liao Zhanpi，et al.Study on modes of occurrence of gold for Shuiyindong gold bearing pyrite in Guizhou Province[J].Gold Science and Technology，2013，21（5）：86-92.
17	河南省有色金属地质矿产局第七地质大队.坦桑尼亚欣延加（Shinyanga）区Mawemeru地区PL7184金矿预查报告[R].郑州：河南省有色金属地质矿产局第七地质大队，2015.
	Henan Provicial Non-ferrous Metals Geological and Mineral Resources Bureau No.7 Geological Team.Pre-exploration report of PL7184 gold deposit in Mawemeru area，District Shinyanga，Tanzania [R].Zhengzhou：Henan Provicial Non-ferrous Metals Geological and Mineral Resources Bureau No.7 Geological Team，2015.
18	河南省地矿局第二地质矿产调查院.坦桑尼亚Mwamola地区Maheiga金矿详查报告[R].郑州：河南省地矿局第二地质矿产调查院，2012.
	No.2 Institude of Geological and Mineral Resources Survey of Henan. Detailed exploration report of Maheiga gold deposit in Mwamola area，Tanzania[R].Zhengzhou：No.2 Institude of Geological and Mineral Resources Survey of Henan，2012.
19	韦龙明.金矿物统计研究中容易忽略的问题[J].地质与勘探，2000，36（1）：29-30.
	Wei Longming.Some easily neglected problems in the studying of gold mineral statistics[J].Geology and Exploration，2000，36（1）：29-30.

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光片编号	Ag	Au	Cu	Zn	Pb	Fe	S	总量
22-1	19.76	79.18	0.10	0.02	-	0.12	0.20	99.38
	21.47	77.82	0.13	0.04	0.01	0.06	0.17	99.70
	24.53	73.40	0.07	0.03	-	0.09	0.28	98.40
2-7	24.03	75.57	0.03	0.02	-	0.18	0.07	99.90
3-3	33.32	66.28	0.01	0.03	-	0.10	0.14	99.88
	33.79	65.63	0.05	-	0.02	0.11	010	99.70
	24.21	75.27	0.03	-	-	0.07	0.21	99.79
	25.06	74.43	-	0.02	-	0.12	0.15	99.78
22-1	12.25	85.36	0.11	0.04	0.02	0.10	0.22	98.10

光片编号	w（Ag）/%	w（Au）/%	w（Ag）/w（Au）	成色/‰	定名
22-1	19.76	79.18	0.25	791.8	银金矿
	21.47	77.82	0.28	778.2
	24.53	73.40	0.33	734.0
2-7	24.03	75.57	0.32	755.7
3-3	33.32	66.28	0.50	662.8
	33.79	65.63	0.51	656.3
	24.21	75.27	0.32	752.7
	25.06	74.43	0.34	744.3
22-1	12.25	85.36	0.14	853.6	自然金

光片编号	矿石类型	粒度				粒度合计	赋存形态
光片编号	矿石类型	粗粒	中粒	细粒	微粒	粒度合计	粒间金	包裹金	裂隙金
42-2	细脉状	0	0	1	0	1	0	1	0
43-4	稀疏浸染状	0	0	8	0	8	5	1	2
43-8	稠密浸染状	0	1	34	0	35	33	0	2
44-2	稠密浸染状	2	3	7	0	12	12	0	0
3-3	细脉状	0	0	4	1	5	0	3	2
2-7	细脉状	0	0	1	0	1	0	1	0
22-1	细脉状	0	3	2	1	6	2	4	0
合计		2	7	57	2	68	52	10	6
占比/%		2.9	10.3	83.8	2.9		76.5	14.7	8.8

Ore Characteristics and Gold Occurrence Status of PL7184 Gold Deposit in Tanzania

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