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新疆觉罗塔格韧性挤压带形成演化及金矿成矿作用
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摘要
新疆觉罗塔格韧性挤压带,是天山纬向构造带二级构造单元——觉罗塔格东西构造带的组成部分,发育于吐哈地块和中天山地块之间石炭系火山——沉积建造中。由一组走向东西、产状直立的透入性片理组成。其中片理构造、拉伸线理构造、同生褶皱构造、布丁构造、压力影构造、置换构造、变形砾石构造、碎斑构造、粒内面理构造、位错构造和矿物光轴优选定向等韧性构造形迹发育。这些不同层次、不同尺度的韧性变形构造形迹的组构都具以变形带或变形面为对称面而呈现出对称的特征。韧性挤压带横分三亚带,岩石形变相变、应力应变及成矿作用等方面都呈横向对称分布。“奶油饼”结构是韧性挤压带的应变结构,压扁机制是觉罗塔格韧性挤压带的应变和变形机制。觉罗塔格韧性挤压带形成于南北两侧吐哈地块和中天山地块的南北向水平共轴挤压作用,形成于觉罗塔格东西构造带形成演化的主变形阶段,大约在255Ma至280Ma(早二叠世)。在韧性挤压变形过程,伴随着金的成矿作用。火山岩、韧性变形带、同构造花岗岩、脆性张扭性变形带是成矿的重要地质条件,其四位一体是康古尔金矿田的成矿模型。
     另外,文章还划分了觉罗塔格东西构造带的变形构造系统和变形阶段,提出了碎屑质韧性动力变质岩的分类方案,探讨了觉罗塔格岩石圈系统韧性变形过程的耗能结构。建立了广泛适用于非等轴颗粒应变测量和应变类型图示的非等轴颗粒付林图解
Jiaoluotage ductile compressed zone is a part of Jiaoluotage Latitudinal tectonic belt which is a second order belt of Tianshan Latitudinal tectonic belt. It developed in Carboniferous volcanic and sedimentary formation between Tuha and Zhongtianshan Landmass. It is comprised of a set of upright penetrative foliations stricking EW. There developed many kinds ductile structural ele- ments, such as schistosity, stretching lineations, contemporary folds, boudingcs, pressure shad- ows, deformed pebbles, mortar structures, intragranular foliations, dislocation structures, and beltroporic fabrics of optic axis. All fabric of these ductile structural elements in different order and scale are symmetry while deformation zone and plane are considered as their symmetry plane. The ductile compressed zone can be transversally divided into three subzones, in which the distri- bution of deformation- metamorphyiam of rocks, stress- strain patterns and ore- formations are in transveral symmetry, "Cream cake" texture is the characteristic strain texture in the ductile compressed zones, which shows flattening is the deformation mechanism of Jiaoluotage ductile compressed zone, Jiaoluotage ductile compressed zone was formed by NS trending horizontal syn- taxial compression caussed by the interaction of Tuha Landmass in northern side and zhongtian- shan landmass in southern side, in major deformational stage in the formation and evolution pro- cess of Jiaoluotage Latitudinal tectonic belt between 255 Ma and 280 Ma in early Permian. The ductile compressed deformation is accompanied with ore—forming process of gold. Volcanic rock formation, ductil deformation zone, syntectonic granite and brittle tense- shear deformation zone are important geological conditions in ore—forming process, these four factors in one body is the ore—formation model for Kangguer gold orefleld.
     In addition, deformation tectonic systems and deformational stages of Jiaoluotage Latitudinal tectonic belt have been divide, and a new classification of clastic ductile dynmo—metamorphyic rocks has been proposed. The energy- consuming texture in ductile deofrmation process of Jiaoluotage Lithosphere system has been discussed. A new Flinn 's diagram of unequiaxial grains, which can be generally used in illustrating strain type of unequiaxial grains, has been set up here.
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