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利用多重反演方法(Multiple Inverse Method,MIM)恢复永平铜矿多期古构造应力场,该方法可以划分形成断层擦痕的多个古构造应力期次。研究表明,永平矿区印支期以来至少受到3期古构造应力场作用,进而探讨了永平铜矿构造演化历史。第一期构造应力场为EW方向的近水平挤压,形成轴向近SN的褶皱,以及走向近南北的逆断层;第二期构造应力场为NW-SE方向近水平挤压,伴随着岩体的侵入,导致层间破碎带的矽卡岩化和矿体形成;第三期构造应力场为EW方向的再次挤压作用,造成控矿断层推覆距离加大,混合岩和矽卡岩破碎带向西逆冲推覆到晚古生代地层之上。
Multiple Inverse Method (MIM) is used to recover the multi-period palaeotectonic stress field of Yongping copper deposit. This method can be divided into several paleocontinent stress stages of fault scar formation. The results show that at least three Paleo-tectono-tectonic stress fields have occurred in Indo-China since the Indosinian period, and the tectonic evolution history of Yongping copper deposit has been discussed. The first phase of tectonic stress field is near-horizontal compression in the direction of EW, forming the fold of axial near SN and reverse fault going to the north and south. The tectonic stress field of the second phase is near horizontal squeezing in NW-SE direction, The intrusion of the body led to the skarnization and ore body formation of the inter-layer crustal belt. The third tectonic stress field was the re-extrusion of the EW direction, resulting in the increase of the overthrusting distance of the ore-controlling faults. The mixed rock and skarn The crust was thrust westwards to the Late Paleozoic strata.