新疆焉耆县松树达坂金矿区岩石地球化学异常特征及找矿效果

doi:10.11872/j.issn.1005-2518.2021.04.186

Abstract

Abstract:

Songshudaban gold deposit in Yanqi County is located in the middle part of the Southwest Tianshan of Xinjiang gold polymetallic metallogenic belt，and near north margin of suture zone between the Tarim plate and Kazakhstan-Erie plate.Songshudaban gold deposit produced in the Sahentuohai-Dashankou brittle-ductile shear zones.The ore-bearing rock are a set of fine clastic rocks and quartz veins from the middle Devonian Saaerming formation.The NW and NWW trending faults developed in the mining area，and metallogenic geological conditions are superior.1∶10 000 geological survey，1∶10 000 soil geochemical survey and explora-tory trench reveal，and other works have been carried out in the area.Four gold orebodies were found，but these orebodies have the features of small scale，low grade and extends unsteadily，the prospecting results are not outstanding.To identify abnormal sources of soil geochemical anomalies and search mineralized rich areas of gold，expand the size of the existing gold orebodies or find new gold orebodies in Songshudaban area，the 1∶2 000 rock geochemistry profile measurement were carried out，two primary halo comprehensive anomaly zones of Au，As，Sb，Hg，Cu，Bi with NWW trending were delinead.The anomalies are mainly distributed in limonite mineralized，kaolinized sericite phylliterelated to ductile shear zone.The mineralization and alteration of sericite chlorite slate，andesite porphyry，marble and other strata on both sides of the shear zone is relatively weak.After anomaly verification，three new gold orebodies and mineralization spots were found.The engineering control gold orebodies are 60~120 m long and 1.00~3.25 m thick with a grade of 0.65×10^-6~2.85×10^-6，it means that the good geochemical anomalies and ore prospecting results have been achieved.According to the features of rock geochemistry and gold mineralization，it is believed that the first subgroup of middle Devonian Saaerming formation is the favorable strata for searching gold deposits，and it is very important ore-searching criteria.The gold deposit is strictly controlled by ductile shear zones.There is great potential to find ductile shear zone gold deposits in Songshudaban mine area.

Key words: rock geochemistry, profile measurement, characteristics of geochemical anomalies, ductile shear zone, Songshudaban gold deposit, Yanqi County, Xinjiang

CLC Number:

P618.51

Hongke FAN,Genming GUO,Bobo DONG,Kai ZHANG,Yuxin LIU. Characteristics of Rock Geochemical Anomalies and Its Prospecting Effect of the Songshudaban Gold Deposit in Yanqi County，Xinjiang[J].Gold Science and Technology, 2021, 29(4): 477-488.

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元素	样品数/件	最大值	最小值	算术平均值	富集系数	变化系数	叠加强度	新疆岩石背景值（杜佩轩等，2002）
Cu	595	5 084.9	2.50	127.90	2.95	62.12	1.94	22.34
Pb	595	7 030	4.10	63.40	1.51	47.37	3.34	12.60
Zn	595	876	2.70	83.30	1.13	49.30	1.17	62.95
W	595	3.11	0.15	0.68	0.74	53.57	1.21	0.76
Mo	595	30.2	0.14	3.37	4.18	92.16	1.32	0.61
Bi	595	17.5	0.02	0.55	2.50	73.53	1.62	0.14
Hg	595	11 198	4.00	103.00	2.38	73.73	3.70	11.70
As	595	1 115	1.10	44.30	3.29	78.52	3.30	4.08
Sb	595	327	0.16	2.36	2.41	54.88	2.88	0.34
Ag	595	8.31	0.01	0.25	0.22	69.23	1.93	0.60
Au	595	2 350	0.60	33.20	11.81	79.42	4.85	0.58

岩性	含量
岩性	Cu	Pb	Zn	W	Mo	Bi	Hg	As	Sb	Ag	Au
绢云绿泥石英片岩	145	53	96	0.76	2.43	0.40	0.08	21.28	1.06	0.21	27.69
蚀变绢云石英千枚岩	104	28	67	0.57	4.59	0.67	0.12	78.90	4.48	0.23	42.19
石英脉	54	99	36	0.41	4.35	0.60	0.27	86.31	2.02	0.45	37.94
断层带	155	48	59	0.39	4.32	0.77	0.04	11.13	1.03	0.43	31.90
全区岩石	128	63	83	0.68	3.37	0.55	0.10	44.31	2.36	0.25	33.16

元素	样品数/件	剔除高值点数/个	剔除前平均值	剔除后平均值	矿化蚀变叠加强度	矿化蚀变叠加强度排序
Au	559	60	33.20	6.85	291	1
Hg	559	54	103.00	27.86	200	2
As	559	59	44.30	13.41	195	3
Sb	559	64	2.36	0.82	184	4
Pb	559	48	63.40	19.0	160	5
Ag	559	47	0.25	0.13	91	6
Bi	559	30	0.55	0.34	49	8
Cu	559	31	127.90	66.00	60	7
W	559	33	0.68	0.56	40	9
Mo	559	23	3.37	2.55	30	10
Zn	559	19	83.30	71.00	22	11

元素	样品数/个	异常平均值	离差	异常下限
Cu	343	66	41	100
Pb	326	19	9	25
Zn	355	71	35	100
W	341	0.56	0.30	0.9
Mo	351	2.55	2.35	3.5
Bi	344	0.34	0.25	0.55
Hg	320	27.86	20.54	50
As	315	13.41	10.53	25
Sb	310	0.82	0.45	2.15
Ag	327	0.13	0.09	0.2
Au	314	6.85	5.44	12.5

Characteristics of Rock Geochemical Anomalies and Its Prospecting Effect of the Songshudaban Gold Deposit in Yanqi County，Xinjiang

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