【摘要】 阿尔泰山的地质构造特点决定了区内砂金物质来源的丰富性,为砂金矿的形成奠定了坚实的物质基础.中生代至第三纪山体长期处于准平原化过程中,伴随着古风化壳的发育,金出现次生富集.新构造运动和第四纪古冰川作用不仅使准平原地形遭受破坏,含金地质体被侵蚀而为砂金成矿提供充足的碎屑物,同时也为金的运移、富集和保存创造了条件.阿尔泰山第四纪砂金矿即是上述有利因素综合作用的结果.更多还原

【Abstract】 The formation of placer in Quaternary period was affected by many factors in AltaiMountain, such as regional geological structure, source of minerial, geomorphy, climate,hydro--dynamic, and so on. The activities of magma were frequent, the melamorphismwas prevail, With Altai Mountain evolution in geological period, these mentioned abovecreated good conditions of structure and dynamy for the formation of golden rocks andplayed the substantial foundation For source of placer. The tectonic movement was relatively stable, climate was hot and moist, chemical andbiochemical weathering were intensive from Mesozoic era to Tertiary period in altai Moun-tain. During this time the mountain continuously undergo weathering and denudation, theelements appeared to migrated and depo-sited in the surface. It resulted in formingresiduum. With the formation of the residuum the gold which existed in rocks produced tobe accumulated secondarily. Neotectonics and paleoglaciation in Quaternary period madethe residuum and golder rocks eroded, and formed abundent fragments which was trans-ported and sedimentated at suitable place. On the other hand neotectonics and fluctuationsof glacier made the deposition and erosion change continuously and resulted in formingterrace placer, differece of geonorphy, and the like. As a matter of fact, the formation ofplacer in Quatermany period was affected by above factors complexly.更多还原