广东怀集地区矽卡岩型铁多金属矿床同位素地球化学特征及其地质意义

doi:10.11872/j.issn.1005-2518.2021.06.217

Abstract

Abstract:

The Huaiji area belongs to the middle section of the Nanling metallogenic belt in Guangdong Province.The metallogenic geological conditions of the Huaiji area are superior.A large number of deposits（points） such as iron，lead，zinc and silver have been found in the area，but their genetic relationship with granite has not been studied in depth.In order to determine the source of minerals，S，Pb，H and O isotope geochemistry studies were carried out to explore the source of metallogenic minerals.On the basis of the background analysis of ore-forming elements，the Pb and S isotope analysis of sulfide in the ore，and the O，H，C isotope analysis of the quartz and carbonate in the altered rock and ore were carried out to trace the mineralization and the source of ore-forming fluids reveals the coupling relationship between magmatic activity and mineralization.The results show that：δ³⁴S_CDT（‰） is -0.12‰~6.58‰，the mean value is 3.23‰，the peak is in the 3‰~5‰，there is a clear tower-like distribution.Since there is no sulfate in the ore，most of the S in the ore-forming fluid is H₂S，which is in a low f（O₂） and low pH environment.The δ³⁴S value of pyrite is approximately equal to the δ³⁴S∑S value of the fluid.Therefore，its sulfur source mainly comes from deep sources，and a small part comes from sulfate materials in stratigraphic marine carbonate rocks.The Pb isotopic composition of most ores is similar to that of Late Cretaceous granite potash feldspar，but the ²⁰⁷Pb/²⁰⁴Pb value of the ores is generally slightly lower.The ore-forming material may mainly come from granite，but there is a small amount of mantle-derived material during the mineralization.The test results of the H and O isotopes of the representative quartz fluids related to the Late Cretaceous granites in the survey area are input into the fluid hydrogen and oxygen isotope composition diagram.Except for the Jiangjuntou deposit，all fall into the range of magmatic water，indicating the main source of ore-forming hydrothermal fluids in magma water.Through the study，it is further confirmed that the ore-forming materials and ore-forming fluids of the skarn type and skarn-hydrothermal vein type deposits in Huaiji area are mainly derived from the late Cretaceous granite.

Key words: isotope geochemical characteristics, granite, source of metallogenic materials, metallogenic conditions, skarn type polymetallic deposit, Huaiji area, Guangdong Province

CLC Number:

P618.4

Yuanhong XIAN,Huasi ZHAN,Jiantang LI. Isotope Geochemical Characteristics and Geological Significance of Skarn Type Iron Polymetallic Deposit in Huaiji Area，Guangdong Province[J].Gold Science and Technology, 2021, 29(6): 805-816.

Figures/Tables 10

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矿床名称	矿体形态	规模	成因类型	成矿地质体	矿石类型	主要矿化和蚀变
东园磁铁矿	透镜状	中型	矽卡岩型	产于黄石脑侵入体与金鸡组砂岩接触带	富磁铁矿矿石	磁铁矿化、矽卡岩化、滑石化、蛇纹石化和绿泥石化
东坑磁铁矿	透镜状	中小型	矽卡岩型	产于黄石脑侵入体与金鸡组砂岩和连县组白云质灰岩的接触带	富磁铁矿矿石	磁铁矿化、褐铁矿化、矽卡岩化和绿泥石化
格仔塘铅锌多金属矿	透镜状	中型	矽卡岩—热液脉型	产于小云雾山组细砂岩中，大桂山岩体的外围	铅锌银硫化物为主的矽卡岩型矿石	方铅矿化、闪锌矿化、黄铁矿化、矽卡岩化、硅化和萤石化
横石铅锌多金属矿	似层状	中型	矽卡岩—热液脉型	产于三岗山岩体与连县组灰岩接触带	铅锌铜硫化物为主的矽卡岩型矿石	方铅矿化、闪锌矿化、黄铜矿化、矽卡岩化、硅化和萤石化
筱鼻磁铁辉铋矿	透镜状	小型	矽卡岩—热液脉型	产于鸡笼岭小岩体与新隆组接触带	富磁铁矿矿石	磁铁矿化、褐铁矿化和矽卡岩化
将军头铁多金属矿	透镜状	中型	矽卡岩—热液脉型	产于将军头岩体与高滩组砂页岩接触带	铁锌钼硫化物为主的矽卡岩型矿石	磁铁矿化、闪锌矿化和矽卡岩化
墩头银铅锌多金属矿	脉状	中小型	破碎蚀变岩型	产于新隆组粉砂岩蚀变带	铅锌银硫化物为主的蚀变岩型矿石	磁铁矿化、铅锌矿化绿泥石化、硅化和角岩化

矿床名称	样品编号	矿物名称	δ³⁴S_CDT/‰
汶朗茶场铁多金属矿	DP191-TW2	磁黄铁矿	0.35
	DP191-TW5	磁黄铁矿	0.06
	DP191-TW10	黄铁矿	3.59
	DP191-TW10	黄铁矿	3.62
格仔塘铅锌多金属矿	DP261-TW1	磁黄铁矿	4.85
	DP261-TW2	黄铁矿	4.39
	DP261-TW4	黄铁矿	4.17
	DP261-TW6	黄铁矿	3.99
	DP261-TW6	黄铁矿	4.02
	DP261-TW8-a	闪锌矿	4.05
	DP261-TW8-b	方铅矿	1.26
横石铅锌多金属矿	D0112-TW-a	方铅矿	6.58
	D0112-TW-b	闪锌矿	4.71
	D0112-TW-c	黄铁矿	5.04
	D0112-TW-4	黄铁矿	5.22
东坑磁铁矿	D0126-TW2	黄铁矿	1.61
东坑磁铁矿	D0126-TW2	黄铁矿	1.49
将军头铁多金属矿	DP201-TW3	黄铁矿	3.23
	DP201-TW4	黄铁矿	-0.12
	DP201-TW5	磁黄铁矿	5.09
	DP201-TW12	方铅矿	0.73

矿床（或花岗岩）名称	样品编号	样品名称	Pb同位素比值
矿床（或花岗岩）名称	样品编号	样品名称	²⁰⁶Pb/²⁰⁴Pb	²⁰⁷Pb/²⁰⁴Pb	²⁰⁸Pb/²⁰⁴Pb
汶朗茶场铁多金属矿	DP191-TW2	磁黄铁矿	18.728	15.751	39.192
	DP191-TW5	磁黄铁矿	18.671	15.755	39.121
	DP191-TW10	黄铁矿	18.685	15.769	39.172
将军头铁多金属矿	DP201-TW3	黄铁矿	18.779	15.788	39.337
	DP201-TW5	磁黄铁矿	18.788	15.747	39.234
	DP201-TW12	方铅矿	18.402	15.623	38.637
格仔塘铅锌多金属矿	DP261-TW1	磁黄铁矿	18.827	15.746	39.295
	DP261-TW2	黄铁矿	18.850	15.784	39.440
	DP261-TW4	黄铁矿	18.849	15.797	39.454
	DP261-TW8-b	方铅矿	18.885	15.799	39.506
横石铅锌多金属矿	D0112-TW-a	方铅矿	18.735	15.818	39.420
横石铅锌多金属矿	D0112-TW-4	黄铁矿	18.669	15.736	39.142
东坑铁矿	D0126-TW-2	黄铁矿	18.846	15.779	39.341
粗中粒含斑黑云母二长花岗岩	DP263-RZ3	钾长石	18.488	15.796	38.752
粗中粒含斑黑云母二长花岗岩	DP200-RZ1	钾长石	18.704	15.850	39.103
细粒含斑二云母碱长花岗岩	DP266-RZ1	钾长石	18.568	15.743	38.633
细粒少斑黑云母二长花岗岩	DP203-RZ1	钾长石	18.717	15.782	39.229
细粒少斑黑云母二长花岗岩	DP222-RZ1	钾长石	18.743	15.820	39.372
细中粒斑状角闪黑云二长花岗岩	DP225-RZ1	钾长石	18.766	15.839	39.398
细中粒斑状角闪黑云二长花岗岩	DP245-RZ1	钾长石	18.811	15.805	39.351
细中粒斑状黑云母二长花岗岩	DP204-RZ1	钾长石	18.780	15.849	39.453
	DP181-RZ2	钾长石	18.761	15.797	39.305
	DP190-RZ1	钾长石	18.809	15.830	39.486
细中粒含斑黑云母二长花岗岩	DP202-RZ1	钾长石	18.788	15.817	39.403
细粒含斑—细粒黑云母二长花岗岩	DP171-RZ1	钾长石	18.736	15.785	39.328
细粒斑状黑云母二长花岗岩	DP230-RZ6	钾长石	18.796	15.783	39.292
花岗斑岩	DP250-RZ1	钾长石	18.804	15.808	39.387

矿床名称	样品编号	测试对象	δD_V-SMOW/‰	δ¹⁸O_V-SMOW/‰
汶朗茶场铁多金属矿	DP191-TW6	石英	-61.2	7.5
将军头铁多金属矿	DP201-TW12	石英	-50.0	8.8
格仔塘铅锌多金属矿	DP261-TW4	石英	-63.9	9.6
格仔塘铅锌多金属矿	DP261-TW7	石英	-61.8	9.2
横石铅锌多金属矿	D0112-TW1	石英	-67.6	8.5

序列名称	岩性	微量元素含量/（×10^-6）
序列名称	岩性	W	Sn	Bi	Mo	U	Th	Pb
连阳序列	细粒少斑黑云母二长花岗岩	2.77~6.04	4.26~8.39	0.27~0.65	0.46~3.50	6.58~11.70	29.90~37.90	43.50~53.40
	粗中粒斑状（角闪）黑云二长花岗岩	2.23~16.5	4.28~6.22	0.15~1.61	0.64~3.04	7.78~14.40	26.70~73.00	35.60~45.80
	细中粒斑状角闪黑云二长花岗岩	2.20~5.73	3.58~12.40	0.15~0.59	0.26~1.38	7.22~17.40	30.20~50.10	35.90~58.30
	细中粒斑状黑云母二长花岗岩	1.08~5.91	2.27~25.30	0.21~2.67	0.57~5.70	13.20~25.30	44.20~63.60	44.10~74.50
	细中粒含斑黑云母二长花岗岩	1.76~3.28	2.70~6.14	0.24~6.73	0.61~8.92	11.00~32.70	47.60~64.30	36.30~81.20
三岗山序列	细粒含斑—细粒黑云母二长花岗岩	0.43~2.77	1.85~5.93	0.09~2.49	0.22~2.27	2.34~4.57	12.13~22.10	24.10~44.14
三岗山序列	细粒多斑黑云母二长花岗岩	0.48~3.63	1.25~1.90	0.11~0.17	0.44~0.58	3.08~5.54	15.01~15.56	23.99~40.80
锅坑花斑岩	细粒斑状黑云母二长花岗岩	10.40~44.70	13.01~23.00	0.49~1.14	0.20~0.34	6.73~8.04	41.50~50.50	26.20~34.80
大雾山序列	花岗斑岩	1.02~1.96	1.92~2.47	0.04~0.11	0.30~2.43	3.55~6.97	12.20~23.60	20.60~24.40
大雾山序列	细粒多斑黑云母正长花岗岩	0.94~1.68	2.69~3.15	0.07~0.12	0.56~0.67	3.62~5.08	11.40~18.40	24.00~26.80
维氏值		1.5	3	0.01	1	3.5	18	20

Isotope Geochemical Characteristics and Geological Significance of Skarn Type Iron Polymetallic Deposit in Huaiji Area，Guangdong Province

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