浅钻地球化学测量在甘肃北山南金山金矿外围浅覆盖区的应用

doi:10.11720/wtyht.2023.1192

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摘要

南金山金矿是北山成矿带典型的浅成低温热液型矿床,该矿床沿NE向延伸至外围浅覆盖区,外围成矿潜力较大。为进一步实现外围浅覆盖区的找矿突破,选择开展机动浅钻地球化学测量试点工作。依据覆盖层性质及厚度,利用车载空气正循环+三翼合金刮刀钻进/气动潜孔锤钻进工艺对浅覆盖区开展机动浅钻化探取样126件,采样密度16.8个点/km²,进一步探讨了浅覆盖区浅钻化探方法技术,包括钻进工艺选择、采样网度、采样物质、样品采集等内容;对零星基岩区开展土壤测量,采集样品278件,采样密度48.77个点/km²;分析测试了Au、Ag、As、Sb、Hg、Cu、Pb、Zn、W、Sn、Mo、Bi、Cr、Co、Ni等15种元素。通过上述工作,圈定化探综合异常7处,后经异常查证在基岩区新圈定金矿体6条、银矿体1条,浅覆盖区新发现隐伏金矿体2条、银矿体1条,取得了较好的找矿效果。本次研究表明浅钻地球化学测量在北山干旱荒漠戈壁景观浅覆盖区找矿是有效可行的。

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	魏振宏
	赵吉昌
	曲正钢
	樊新祥
	李省晔
	陈海云
	刘永彪
	杨镇熙

关键词 ：浅钻地球化学测量, 浅覆盖区, 南金山金矿, 甘肃北山

Abstract：

The Nanjinshan gold deposit is a typical epithermal deposit in Beishan metallogenic belt, which extends in a N-E direction to the peripheral shallow cover zone. In order to further achieve the breakthrough of prospecting in the peripheral shallow overburden area, the pilot work of motorized shallow drilling geochemical survey carried out. Based on the nature and thickness of the overburden, 126 motorized shallow drilling geochemical exploration samples are taken in the shallow overburden area using the vehicle mounted air positive circulation and three wing alloy scraper drilling or pneumatic DTH hammer drilling technology, with a sampling density of 16.8 points per square kilometer. The shallow drilling geochemical exploration methods and technologies in the shallow overburden area are further discussed, including the selection of drilling technology, sampling network, sampling materials, sample collection, etc. Soil survey was carried out in sporadic bedrock areas, and 278 samples were collected, and the sampling density was 48.77 points per square kilometer. Fifteen elements including Au, Ag, as, Sb, Hg, Cu, Pb, Zn, W, Sn, Mo, Bi, Cr, Co and Ni were analyzed. Through the above work, seven comprehensive geochemical anomalies were delineated. After anomaly investigation, six gold deposit bodies and one silver deposit body were found in the new circle in the bedrock area, and two concealed gold deposits and one silver deposit body were found in the shallow overburden area. The results show that shallow drilling geochemical survey is effective and feasible in the shallow overburden area of arid Gobi landscape in Beishan.

Key words： shallow drilling geochemical survey shallow overburden area Nanjinshan gold mine Beishan, Gansu

收稿日期: 2022-04-15 修回日期: 2022-08-01 出版日期: 2023-04-20

ZTFLH:

P632

基金资助:甘肃省基础地质调查项目(甘资勘发〔2020〕134号);甘肃省基础地质调查项目(甘资勘函[2021]184号);甘肃省科技计划项目(21JR7RA787);甘肃省科技计划项目(22JR5RA819)

通讯作者: 赵吉昌(1984-),男,正高级工程师,从事区域矿产地质调查及矿产勘查工作。Email:278717758@qq.com

引用本文:

魏振宏, 赵吉昌, 曲正钢, 樊新祥, 李省晔, 陈海云, 刘永彪, 杨镇熙. 浅钻地球化学测量在甘肃北山南金山金矿外围浅覆盖区的应用[J]. 物探与化探, 2023, 47(2): 331-342.
WEI Zhen-Hong, ZHAO Ji-Chang, QU Zheng-Gang, FAN Xin-Xiang, LI Sheng-Ye, CHEN Hai-Yun, LIU Yong-Biao, YANG Zhen-Xi. Application of shallow drilling geochemical survey to shallow overburden area at the peripheral of Nanjinshan gold mine in Beishan, Gansu Province. Geophysical and Geochemical Exploration, 2023, 47(2): 331-342.

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https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2023.1192 或 https://www.wutanyuhuatan.com/CN/Y2023/V47/I2/331

Fig.1 南金山金矿外围一带地质矿产分布(据1:5万野马大泉幅修编^[22])
1—第四系全新统冲积层;2—第四系更新统冲洪积物;3—新近系苦泉组;4—石炭系白山组;5—中石炭世二长花岗岩;6—中石炭世石英闪长岩;7—闪长岩脉;8—石英脉;9—性质不明断层;10—平移断层;11—中型金矿床位置;12—金矿点位置;13—铜多金属矿床位置;14—叶腊石矿床位置;15—地层产状;16—研究区

Fig.2 研究区覆盖结构单元层综合柱状图(a)、覆盖层厚度等值线(b)及覆盖层沉积示意(c)

Fig.3 研究区浅覆盖区地貌景观(a)及机动浅钻现场施工照片(b)

参数		Cr	Co	Ni	Cu	Zn	Mo	W	Pb	Bi	As	Sb	Sn	Ag	Hg	Au
算术平均值	$X ˉ 1$	72.0	8.3	26.6	31.1	96.7	2.42	3.15	22.8	0.27	70.8	4.37	1.1	66.528	35	5.5
算术平均值	$X ˉ 2$	62.8	6.9	24.4	20.4	69.2	1.91	2.48	23.4	0.28	62.5	5.37	1.4	71.539	55	5
校正系数	k₁	0.87	0.83	0.92	0.66	0.72	0.79	0.79	1.03	1.04	0.88	1.23	1.27	1.08	1.57	0.91
校正系数	k₂	1.15	1.20	1.09	1.52	1.40	1.27	1.27	0.97	0.96	1.13	0.81	0.79	0.93	0.64	1.10

Table 1 经过迭代剔除后的算术平均值及校正系数

元素	地球化学场(n=384)				地球化学背景场				D	北山地区背景值^[31]
元素	$X ˉ$	S	C_v	K_k	$X ˉ 0$	S₀	C_v0	K_k0	D	北山地区背景值^[31]
Cr	73.40	87.70	1.19	1.63	66.00	22.30	0.50	1.47	4.37	44.94
Co	8.30	9.80	1.18	0.88	7.40	3.30	0.35	0.78	3.33	9.43
Ni	29.10	30.90	1.06	1.24	25.30	12.10	0.52	1.08	2.94	23.38
Cu	29.20	42.50	1.46	1.72	24.40	13.40	0.79	1.44	3.80	17.00
Zn	93.30	79.40	0.85	2.21	78.50	34.10	0.81	1.86	2.77	42.30
Mo	2.76	2.98	1.08	3.58	1.86	1.13	1.47	2.42	3.91	0.77
W	4.29	6.85	1.60	4.77	2.61	1.16	1.29	2.90	9.71	0.90
Pb	34.90	87.60	2.51	2.53	23.50	10.50	0.76	1.70	12.39	13.80
Bi	0.43	0.72	1.67	0.62	0.27	0.12	0.17	0.39	9.56	0.69
As	122.10	185.60	1.52	33.73	66.20	69.10	19.09	18.29	4.95	3.62
Sb	8.02	9.98	1.24	19.56	5.03	4.50	10.98	12.27	3.54	0.41
Sn	1.40	0.70	0.50	0.76	1.30	0.30	0.16	0.70	2.51	1.85
Ag	286.91	764.48	2.66	5.58	69.69	21.32	0.41	1.36	147.62	51.40
Hg	52.00	35.00	0.67	3.05	49.00	29.00	1.70	2.88	1.28	17.03
Au	22.90	88.20	3.85	18.62	4.90	3.80	3.09	3.98	108.47	1.23

Table 2 研究区地球化学参数统计

Fig.4 元素聚类分析谱系

Table 3 因子旋转后的成分矩阵

Fig.5 研究区地质简图(a)、Au地球化学异常分布(b)及Ag地球化学异常分布(c)
1—全新统;2—更新统;3—新近系;4—石炭系白山组;5—中石炭世二长花岗岩;6—中石炭世石英闪长岩;7—中石炭世闪长岩;8—次生石英岩;9—性质不明断层;10—平移断层;11—正断层;12—逆断层;13—机动浅钻孔位;14—土壤测量点位;15—施工见矿钻孔;16—元素高值点;17—浅钻剖面位置;18—综合异常及编号;19—地球化学测量范围;20—选矿厂位置;21—金矿化带;22—金银矿化带

Fig.6 基岩区Au1~Au3矿体(a)和Au4~Au6矿体(b)采样平面
1—凝灰质砾岩;2—含砾凝灰质砂岩;3—沉凝灰岩;4—硅质灰岩;5—英安质凝灰岩; 6—次生石英岩脉;7—闪长岩脉;8—Au矿体及编号;9— Ag矿体及编号;10—实测性质不明断层;11—实测逆断层;12—地层产状;13—勘探线位置及编号;14—见矿钻孔位置及编号;15—完工探槽及编号;16—矿体厚度(m)/金平均品位(g/t) 银平均品位(g/t)

Fig.7 研究区96勘探线视极化率断面(a)、视电阻率断面(b)、元素曲线(c)及勘探线剖面(d)
1—第四系洪冲积砂砾石;2—砾岩;3—粉砂质泥岩;4—含砾粉砂质泥岩;5—含角砾英安质凝灰岩;6—凝灰质板岩;7—褐铁矿化含角砾凝灰质板岩;8—绢云母板岩;9—含炭绢云母板岩;10—黄铁矿化含炭绢云母板岩;11—次生石英岩;12—金矿体;13—推测断层界线;14—已完工机动浅钻位置及编号;15—已完工钻孔位置及编号;16—矿体厚度(m)/金平均品位(g/t);17—潜水面

Fig.8 南金山外围ZK9601钻孔中矿石(a)及显微镜下南金山金矿石(b)^[33]照片
Au—自然金;Py—黄铁矿;Cpy—黄铜矿;Qz—石英

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