对玲珑—焦家矿集区几个关键地质问题的认识

玲珑—焦家矿集区受伸展-走滑联合构造应力场控制,其矿体倾向与倾角以及侧伏向与侧伏角皆受上述构造动力学条件制约;成矿构造系列类型为伸展-走滑复合型,并可分为四个亚系列;脆性域成矿过程可分解为雏形断裂与宏观断裂两个阶段,而雏形断裂阶段成矿在矿集区十分普遍。讨论了矿集区几种关键构造的型式与性质,并对成矿远景做了初步评估。

RECOGNITION ON SOME KEY GEOLOGICAL PROBLEMS OF LINGLONG-JIAOJIA ORE-CONCENTRATED DISTRICT IN SHANDONG PROVINCE

The metallostructures in the Linglong Jiaojia ore concentrated district are controlled by the compound tectonic stress field formed by complex of the extension and strike slip structures. Dip and dip angle of the orebodies, as well as their pitch and pitch angle, are confined by the dynamics above. In this paper, we define the metallotectonic series to be a series of metallotectonics related to one another under the same tectonic regime. Based on the definition, the type of metallotectonic series (MS) in the Linglong Jiaojia ore concentrated district is confirmed a kind of compound type caused by extension and strike slip. It consists of four subtypes of MS, in the Linglong gold orefield and Jiaojia gold orefield, their MS are principally controlled by extensional stress in early period and by strik slip stress in later period, respectively. The metallostructures in brittle domain may be divided into two kinds, one is embrofracture, and the other is macrofractures. Embrofractures are defined as a linear nonsequential tectonic zone that is composed of many en echelon lenses in which developed large numbers of microfractures. In the formation of embrofractures, mineralization occurs very commonly. The features of some key structures have been discussed and the ore forming perspectives have been appraised in this paper.