Research On Giant Nappe Structure And Golden Deposit Prediction In North Of Heilongjiang Province

North Heilongjiang Province is our country's important gold ore minerogenic belt. The author take the giant nappe structure system's metallogenic theory and the synthesis information minerals prediction theory as the instruction for the first time, has carried on the prediction research work in this area.The paper discusses the geological feature which the giant nappe structure active environment the time when the giant nappe structure becomes and forms, and the pattern that the giant nappe structure golden ore deposit. The author divided 21 geological units, extracted optimized 37 geological variables and evaluated it, used many kinds of mathematical models has scored the unit resources characteristic, has carried on the quota prediction to this area gold ore. It has obtained following main achievement through the research:1. feature of giant nappe structure in Heilongjiang northernIn the northern part of Heilongjiang has established the giant nappe structure in existence, and along the direction of nappe structure thrust it's mark off the nappe of the root zone, central zone and brought forward.The nappe of root zone is distributing between Kentewula and Tatale in Mongolia, namely in the line of Jiemichefushika mountain, Suoluokang mountain, Damubuji mountain, Tuopuke mountain in Russia. The whole root is divided into western, middle and eastern three parts, and total length is 1950 km.The central zone generally is not Kerulen - Ergun - mamyn matching massifs.In the western of Striker is distributed between Mongolia Kentewula mountains and Tatale-Mongolia and Mongolia Khan-China Tuquan-Tailai- Xunke-Russian Saluoli Hill-Yamadayev River, and the striker with 2000 km long, the width of 50 km to 825 km.It's Pointed out that the main fracture surfaces of Jurassic giant nappe structure in the northern part of Heilongjiang make up of seven 1st class tectonic system components. it's determine residual strain rock erosion average thickness of 627 meter, the largest thickness in Sunwu through magnetotelluric sounding section.in northern of Heilongjiang giant nappe structure the autochthonous system made up of Archaean, The Upper Sinian-lower Cambrian , Ordovician, Silurian, Devonian, the Lower Carboniferous and Early Carboniferous alkali feldspar granite, the Upper Carboniferous and the Late Carboniferous intrusive rocks, lower-middle Permian, Early Permian granitic rocks and miscellaneous nappe product ,Upper Permian-lower Triassic(P₃³-T₁¹),Ruiti bands of the Upper Triassic-Arias bands(T₃³-J₁¹) of Lower Jurassic, Indo-chinese epoch granite (YJ₃³-YJ₁¹), the Early Jurassic granite category(YJ₁), the middle Jurassic granodiorite porphyry(YJ₂), the construction of middle Jurassic volcanic rocks (J₂V) , the middle Jurassic sedimentary (J₂S) and rock formation.alien system of giant nappe structure in northern Heilongjiang distributed in the central zone of giant nappe, namely the West from yimuhe-menduli- fulahan-baiyinna-Heihe-baihualinchang-beian-arongqi-Wulanhaote-Huolinguole-wuka-yimuhe confining region. External system is mainly composed of Baluoyi regional metamorphic rocks in Xinghuadukou Group, mixed complex Proterozoic(MgPt) and mixed granite diorite(MdPt), komatiite, the Lower Devonian and archean quartz spot rock. 2.giant nappe structure operating environment in northern HeilongjiangUnder the nappe of the main faults, the autochthonous system was reformed the angle of the rock due to the heating , Kraft belt was transformed into diopside-garnet-epidote hornfels, galena, light-colored sphalerite, yellow Copper typical temperature in combination with calcium-silicon hornfels, clastic rock and mudstone had been transformed for andalusite, cordierite, garnet hornfels, biotite quartz rock angle more generally.Above the fracture surface on the external system from nappe structure had been transformated early mylonite of biotite-muscovite in particular the mixed granite and mixed complex. Under the main section, the super-iron and iron-magnesia can also be transformed into rock angle, which belong to the middle temperature product. Therefore, it's speculated formation temperature conditions of giant nappe structure was middle temperature.Stress average of giant nappe structure formed is about 110 MPa.From the mylonite, the transformation of feldspar and brittle deformation, rock fragments mylonite and more mylonite been transformed for the brittle deformation of the rock and gold mineralization examples,it's infered the activities time of giant nappe structure continuing is much longer.3. Determine giant northern Heilongjiang nappe mineralization eraFrom the giant nappe autochthonous system rock formation and geological era, Nappe orogeny formed in the foothills of the geology, the rock groups of the isotope data and ductile deformation in metamorphic rocks of the isotope data analysis and judgement, the geological time of the giant nappe structure should be late Jurassic.4. Establishing the geological model of mineralization by the ore-forming system of nappeWith J2-3 nappe of the mineralization contain at least mylonitic, contained the relation of the role of mylonite deposit with nappe thermal effect of the angle rock type deposits; including the deposits of nappe stacking role with volcanic, and the depsits related to the rock with ultramafic and mafic magmatic, the model related to the large rocks and the possible composition of the light-coloured seats of the quartz vein type such as tungsten and molybdenum ore mineralization. Distribution of the more general, multi-metal deposit can be summarized in the following five categories of deposit mode: A: Shabaosi-rock gold deposit model: B: Shabaosi gold-silver deposit and Cheng Paper kiln type gold deposit model; C: Walali - Heilonggang groove type of gold deposit model; D: Guliku type gold deposit model; E: Universal-Gaxian type of cents polymetallic ore deposit model;5. The prediction technique has made the new progressFor the first time application giant nappe structure mineralization system's new theory and synthesis information minerals prediction theory and method, have carried out the mineralization background deep research and the gold ore appraisal forecast research work in the research area. Has divided 21 geological units, has extracted 45 geological variables and evaluates, the optimization is 37 geological variables and evaluates; With the characteristic analysis, Q mathematics evaluation model quotas and so on cluster analysis, corresponding analysis and logic information method have melted the geological unit resources characteristic.6.The gold ore prediction has obtained the new effectCarries on the mineralization analysis to the geological unit, and to the ore deposit position, the rank and the amount of resources carries on the prediction that has made the good progress. There is 2 I level mineralization unit, 2 II level mineralization unit and 5 III level mineralization unit in 12 predicted units; there are 2 large-scale golden deposit, 3 medium-scale golden deposit and 10 small-scale golden deposit in 15 non-model units, in 15 non-model units A level mineralization prospect area 2, B level mineralization prospect area 5, C level mineralization prospect area 8.