Characteristics Of Tectonic Deformation Of Metamorphic Core Complex Of Zarijia Area

To the nature of the Songpan-Ganzi basin, because it involves the majorgeological problems such as ancient Tethys evolution, has been attracting theattention of academic circles, especially whether there are basement rock series in thebasin, debate over.For a long time, for the Kekexili-Songpan ganzi (or Kekexili-Bayankala) Triassic sedimentary basin tectonic attribute exists differentunderstandings, the key problems of understanding the basin tectonic attribute is, whatis under the thick Triassic flysch basement? The native North Bayankala mountainand Zharijia regional metamorphic core complex, with a typical two layer structure.From tectonic schist, tectonic gneiss,phyllite composed of dome anticlinal nucleus, itscenter is the monzonitic granite rock body in Yanshan period, cover for Bayankalamountains group shallow metamorphic sand plate, between the core and cover layer isthe detachment fault. This article through to the researches of the structural style ofZharijia metamorphic core complex, basic composition, structure, isotope chronology,formation time and output background,especially in the metamorphic core complexlithology, rock geochemistry, protolith restoration, isotope analysis, combined withthe regional comparison,consider this set of metamorphic strata body regardless ofrock assemblage, and degree of metamorphism and lithofacies assemblagescharacteristics have a certain similarity with NingDuoyan group. It belongs to the-neoproterozoic NingDuoyan group, it is the metamorphic crystalline basement of theKekexili-Bayankala Triassic of sedimentary basin, It is under the effect of furtherregional hot long stretch forming,under the action of the earth’s crust level stretch,massive low angle normal fault uplift the old metamorphic rock which in the deepersense of earth’s crust to the earth’s crust surface and form;The determination ofZharijia metamorphic core complex shows that under the Bayankala depositionalbasin,there is ancient basement in proterozoic.And on the basis of this put forwardthe new understanding of the genesis of Dachang gold deposit type.