| 宣化小营盘金矿的控矿构造研究 |
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| 引用本文：.1994.Tectonic controls over the development of the Xiaoyingpan gold deposit, Xuanhua, Hebei province[J].Mineral Deposits,13(4):363~370 |
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| 中文摘要:本文探讨了河北宣化小营盘金矿区的系列构造事件及相伴的变质-热事件，厘定了该区一条角闪岩相韧性剪切带以及稍晚的以剪切带中心为滑脱面的系列冲断构造。野外丰富的变形标志清楚地显示了这两期运动方向相反的构造事件的存在。显微构造亦十分丰富，并证实了这两期运动的存在及其先后关系。金矿主要以石英脉型式赋存于滑脱带，而顶、底板糜棱岩只有在冲断层切割处才显示含金石英脉。因此，笔者在小营盘金矿构造研究这一薄弱环节上有突破性认识，并指出控矿构造事件发生于中生代。基于此，对该区扩大找矿前景作者提出了有益的理论指导。 |
| 中文关键词:小营盘金矿 韧性剪切带 推覆滑脱 中生代 |
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| Tectonic controls over the development of the Xiaoyingpan gold deposit, Xuanhua, Hebei province |
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| Abstract:Detailed research has been made on tectonic events as well as the accompanying metamorphism and heat events in the Xiaoyingpan gold ore district, Hebei Province. It is pointed out that there exists a ductile shear zone of amphibolite facies and a series of subsequent thrusts gently dipping down into a detachment surface lying in the central part of the shear zone. Furthermore, plenty of deformation suggests that the activities of these two different tectonic deformations on different levels occurred in reverse directions. Thin section studies also confirm their existence and reveal their time relationship. Gold ore mainly occurs in the detachment zone with abundant spaceformed by lots of fractures and proper temperature; nevertheless, mylonites in both hanging and lying walls of the detachment rarely contain auriferous quartz veins unless they are cut by thrusts. In view of some geological evidence on the North China plate affected by the Yangtze plate, it is thought that these two different tectonic events took place in Mesozoic. Therefore, it is reasonable to hold that our research has made a breakthrough in the study of regional tectonics of this gold district. In the end, some useful suggestions are given to enlarge the area of the gold ore district. It is considered that follow up survey should be done in NW and SE directions east of the Hujiaogou fault and also in NW direction west of the fault. |
| keywords:ductile shear zone, thrust detachment surface(zone), Mesozoic, Xiaoyiagpan gold district |
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