Tectonic Deformation Characteristics Of Study On Pre-Mesozoic In Huogeqi Region Of The Langshan In Inner Mongolia

Huogeqi region of Wolf Mountain in Inner Mongolia located in western part of northern margin of north china block, which is one of the important metal ore deposit area in our country. It occurs multiple large strata bound type of copper, lead and zinc polymetallic deposit, such as the jet-sedimentary type copper polymetallic and pb-zn deposit like the Dongsheng Temple, the Tanyaokou, the JiaSheng plate, huoge opposite jets etc, are important important ore-bearing horizon.At present, a large number of study about the types of time and space of the regional metamorphic rock, establish the Baoyintu Grou and Zhaertai group.Unfortunately, there’s no relative fine expression about the properties and mutual relations of the extensive development of the fold and fault structure in the old metamorphic rock in Wolf Mountain. It’s really urgent to do the Early Mesozoic tectonic analytical research about metamorphic rock series in this area, no matter in basic geological or in mineral geology. The author observed some outcrop geological phenomena in different structures that can expose the types of fold and fault and their relations when he participated in six maps of 1:50000 regional geological survey in Chagan Hushu temple in Inner Mongolia. As a breakthrough point, the author used the rock stratigraphy, isotopic chronology to study the Baoyintu Grou, Zhaertai Group, the Paleozoic strata composition, metamorphic deformation characteristics and ages, confirming that the first phase of the tectonic deformation is the earliest tectonic deformation in the research area, which is a mid-deep tectonic deformation formed under the effect of stratification-bedding shear theomorphism. It mainly formed in stretch tectonic system. In most cases, the original bedding(S0) of metamorphic strata performs in the quartzite whose competence is single. It can be seen that the nearly consistence of the original bedding(S0) and schistosity(S1) in the regional outcropped quartzite group, which macroscopic constitutes the "layer" structure, and S1 shows as extensive development of bedding recumbent folds and rootless folds. The second phase of the tectonic deformation performed as strong structural displacement in mica schist in Baoyintu Group, forming new schistosity S2 and schistosity(S1) fold, and the fold types are complicated, mainly tight fold.In Zhaertai Group, theoriginal bedding plane(S0) is the fold of deformation plane, and the form features as flaser intensively, folds deformed obviously to small folds, folding layers between layers, etc. Third stage of tectonic deformation in the Baoyintu Group showed as a large number of the development of crenulation lineation on schistosity(S2) plane and the folding phenomenon of schistosity(S2) as the deformation plane in the research area, mainly middle length-width slow folds.In Zhaertai Group, the folding of the schistosity(S1) as the deformation plane happened, and in the process of schistosity folds, the strong structural displacement phenomenon appeared in part of hinge zone, S2 replaced S1, developing Penetrative replacement foliation S2. Tectonic deformation in the Paleozoic strata occurred folding features closeness and inversion, while the original bedding as deformation plane. Secondly, through the newly acquired a large number of isotopic data, the sedimentary eras of the proterozoic, the neoproterozoic, Paleozoic strata were made clear, and preliminary discussion was made on the era of metamorphic deformation in the third phase. Based on these, the preliminary discussion about Tectonic Deformation Characteristics of Study On pre-Mesozoic.