东天山觉罗塔格金矿带构造变形与成矿预测

Structure deformation and metallogenic prognosis of gold ore zone in Jueluotage of Eastern Tianshan

东天山觉罗塔格金矿带构造变形特征明显,横向分带可分为3个变形子带,组构差异显示走向分段韧性剪切带发展演化过程中相伴的脆韧性变形转换带较为普遍。脆韧性变形转换过程受多种动力作用方式控制,造成多种变形方式同存互竞,常见微破裂、碎裂流和晶内滑移。有两种转换过程,宏观上各圈层的变形连通和微观上主要地质体内的变形开合使脆韧性变形转换带内流体强烈对流,并富集成矿。近年来在该区带发现的一系列金矿床(点),约85%都分布于脆韧性变形转换带中,数值模拟显示脆韧性变形带控制金矿床,其中的张性扩容构造控制金矿体。此已成为该区剪切变形带内控矿的重要特征和普遍规律。

Feature of structure deformation is obvious in Jueluotage gold ore zone of Eastern Tianshan, its transverse belting divides into three deformation daughterbelts. Difference of fabric pattern show strike segmenting. Brittleness-ductility deformational transform zone is a widely spread during development and evolution of ductile shear zone. Brittle-ductile deformation transfer process is controlled by many kinds of dynamics function,which make the multi-deformation pattern coexi stence, that there are microbreak, cataclastic flow and intracrystal slip. There are two kinds of transformation processes, which one is deformation connecting on macroscopic during the various sphere and another one is deformation opening and closure in the main geologic body on microscopic make fluid strong circulation convection in the brittleness-ductility deformational transform zone, and enriching metallogenic. In recent years we have already found a series of gold ore deposits distributed at the brittleness-ductility deformational transform zone nearly 85% in this area, numerical simulation show the brittleness-ductility deformational transform zone controlled the gold ore deposit, and tensional dilatancy structure controlled gold orebody. This already became an important feature and universal laws of ore-control in the shear deformation zone in the area.