小秦岭金矿田Q240控矿构造特征及深部成矿预测

韩舫; 白和; 王和平; 文月贵; 张欢欢; 韩鑫

小秦岭金矿田Q240控矿构造特征及深部成矿预测

韩舫^1,,
白和^{1, 2},
王和平¹,
文月贵¹,
张欢欢¹,
韩鑫¹

1.
陕西地矿第六地质队, 陕西临潼 710611
2.
陕西省矿产资源勘查与综合利用重点实验室, 陕西西安 710054

基金项目:

中国地质调查局地质研究项目"陕西小秦岭金矿田深部及外围金矿整装勘查区关键基础地质研究" 12120114014101

详细信息

作者简介:
韩舫(1976-), 男, 工程师, 主要从事矿产勘查及成矿预测工作。E-mail:1178053826@qq.com

中图分类号: P618.51
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- 文章访问数: 230
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- 被引次数: 0
出版历程
- 收稿日期: 2015-12-30
- 刊出日期: 2016-06-28

THE CHARACTERISTICS OF ORE CONTROLLING STRUCTURE AND DEEP MINERALIZATION PROGNOSIS OF THE Q240 VEIN IN XIAOQINLING GOLD FIELD

1.
The Sixth Geological Team of Geological and Mineral Exploration and Development Bureau, Lintong 710611, Shaanxi, China
2.
Key Laboratory of Exploration and Utilization of Mineral Resources, Xi'an 710054, China

摘要

摘要: 对小秦岭金矿田Q240号矿脉进行构造与矿化蚀变特征分析研究，结果表明该脉体经历了多期构造活动改造。构造带早期以左行脆韧性剪切变形为主，发育北西走向石英脉，其构造线理倾伏向南西，石英脉中矿化特征以黄铁矿为主，呈条带状分布；而后期右行脆韧性剪切变形则形成北东东走向的黄铁矿石英脉。对3个矿体平面上变化特征的分析表明，矿体被多期构造-热液活动叠加，主成矿构造应该与北东走向的左行剪切变形相关，并在后期遭受了右行走滑变形改造，以北东东走向的缓倾结构面为容矿空间。结合应力环境和控矿规律以及矿体侧伏特征，依据构造蚀变特征，认为矿体在走向和倾向上均有似等距规律。据此，在Q240矿脉深部圈定出3处成矿靶区。
- 小秦岭金矿田 /
- 控脉(矿)断裂构造 /
- Q240矿脉 /
- 深部预测
Abstract: The research on structure and mineralization alteration of Q240 vein in Xiaoqinling gold deposit indicates that the vein undergoes multi-stage tectonic activity transformation. In the early stage, structural belt undergone mainly left-lateral brittle ductile shear deformation, and developed NW-trending quartz vein with the structure lineation plunging toward SW. Mineralization of the vein was characterized by the rich pyrite with a strip distribution. While the later right-lateral brittle ductile shear deformation formed the NEE-trending pyrite quartz vein. By analyzing the change characteristics of three orebodies in the plane, we know that the vein is constructed by multi-superimposed tectonic hydrothermal activity and the main structure is associated with the left-lateral shear deformation, and later suffered the right-lateral deformation. The NEE-trending structure plane forms a space for mineralization. Combined with stress environment, ore control regularity and orebody lateral characteristics, we get that the ore body appear equidistant regularity in the strike and dip based on the structure alteration. According to the research, we predict three mineralization targets in the deep of Q240 vein.
- Xiaoqinling gold field /
- fault structure /
- the Q240 vein /
- deep prognostication

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图 1 小秦岭金矿田区域地质简图

Figure 1. Regional geology of Xiaoqinling gold field

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图 2 Q240号矿脉地质简图

Figure 2. Geologic map of the Q240 vein

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图 3 Q240矿脉北东段地表构造特征

Figure 3. Surface structure characteristics in the north-east part of the Q240 vein

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图 4 Q240矿脉① 号矿体两期石英脉构造关系

Figure 4. Structure relationship between the two phase of quartz veins in No.1 orebody of the Q240 vein

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图 5 Q240矿脉② 号矿体构造特征

Figure 5. Structure characteristics of No.2 orebody of the Q240 vein

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图 6 Q240矿脉③ 号矿体构造特征(YD1280)

Figure 6. Structure characteristics of No.3 orebody of the Q240 vein

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图 7 Q240矿脉② 号矿体构造蚀变特征

Figure 7. Structural alteration characteristics of No.2 orebody of the Q240 vein

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图 8 Q240号矿脉成矿期构造运动特征

Figure 8. Characteristics of tectonic movement during the period of mineralization of the Q240 vein

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图 9 Q240矿脉控矿应力分析平面与剖面示意图

Figure 9. Controlling stress analysis of the Q240 vein in plane and profile

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图 10 Q240矿脉深部矿体位置预测图

Figure 10. Forecasting of deep orebody in the Q240 vein

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表 1 Q240号矿脉矿体特征统计表

Table 1. Orebody characteristics of the Q240 vein

矿体编号	规模				金品位/10^-6		矿体形态	产状
	走向长度/m	延深/m	厚度/m		一般	平均
	走向长度/m	延深/m	一般	平均	一般	平均
①	190	140	0.65~1.00	0.82	3.27~20.53	9.46	脉状	130°∠73°
②	500	173	0.40~1.00	0.76	2.25~20.67	7.54	脉状	310°∠75°
③	150	100	0.30~1.03	0.71	1.95~10.52	10.23	脉状	130°∠78°

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表 2 矿石矿物成分表

Table 2. Ore mineral composition

矿物分类	金属矿物		非金属矿物
矿物分类	原生矿物	表生矿物	原生矿物	混入矿物
主要矿物	黄铁矿	褐铁矿	石英	绢云母
次要矿物	方铅矿、黄铜矿	铜蓝	菱铁矿、白云母	方解石
微量矿物	磁铁矿、白钨矿、磁黄铁矿、斑铜矿、闪锌矿、辉钼矿	赤铁矿、针铁矿、白铅矿、孔雀石	重晶石、含铁方解石、微斜长石、锆石	白云母、角闪石、黑云母、绿泥石、绿帘石、长石

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表 3 矿石中化学成分表

Table 3. Chemical composition in the ore

Ag	Al₂O₃	B	Ba	Be	CaO	Cd	Ce	Co	Cr	Cu	Tfe₂O₃	Ga	Hf	K₂O	La	Li	MgO	Mn	Mo
＜1	740000	80	760	-	610000	＜1	50	25	200	30	690000	40	5	310000	25	10	360000	1700	20

Na₂O	Nb	Ni	S	Pb	Rb	Sb	Sc	Sn	Sr	Ta	Th	Ti	V	W	Y	Zn	Zr	Hg	SiO₂
1000	＜1	100	2300	60	15	-	15	＜1	750	＜1	20	1000	70	＜1	15	80	25	/	100000

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