| The Lianghe Lailishan tin ore deposit is a main deposit type in the western subzone of the Western Yunnan tin ore zone. This ore deposit is located at the transition spot of Tengchong-lianghe arc structure,that ramed east neighbour three rivers structure belt,which is in the preceding plart of the Indian and Eurasia tectonic plates collision belt. There are close time and space relations and origin relation between the ore deposit and the granitic magma activity of the Ximalaya mountain time, formed after the hydrothermal process by the Laoxiongwo, has panned for Taojinchu the mineralization which place, Sangedong ore section was composed to concentrate the area.After geological research on the field and the collection of previous information, and analyzing comprehensively and researching ore-body shape, size and occurrence which composed the deposit, the ore types, structure, mineral composition, wall rock alteration, we achieved the following results through analyzing the ore-controlling geological factors of deposits and metallogenesis:1. We know that ore-forming materials come mainly from the Himalayan granite by studying the ore-forming geological conditions of Tin on the Laili Mountain, and there were parts of Tin in the wall rock going in the ore-forming fluids at the process of mineralization, so as to provide a material basis for ore-forming. The deposits belonged to Pyrite-Cloud British rock type hydrothermal deposits.2. The ore-body in the zone exists mainly in the tectonic belt broken of the Upper Carboniferous Ping mercerizing upper third layer (C2s2-3) and fifth layer (C2s2-5). Ore body and surrounding rock was gradually transiting.The ore-body is mainly in the 85～62 exploration line, in the way 40～80°, inclined to the North West, angle 60～90°, for distribution to the North East, showed a protrusion arc though south and east, and "S" type on the plane as controlled by the arc fault fracture zone. The larger was the scale of main faults, the larger the ore-body was, and vice versa. The ore body was up into a flying-geese-like arrangement in space, on vein in the plane, composite vein branches, lenticular, and pinch-out wedge-shaped at section on. Parts of ore-body emerged the phenomenon of thinning and thickening due to the transformation of the late tectonic.3. Emplacement of Himalayan granite provided the main material source for the ore-forming, and wall rock also provided some ore-forming materials at the process of mineralization, thus constituted the material basis of forming the body of tin. Strong tectonic movement provided the condition of account, migration, sedimentation for ore-bearing hydrothermal; Sustained tectonic movements and continuous magma differentiation made so many stages of minerals into the superposition, and took shape tin deposits.4. Strictly controlled mineralization, the tectonic is not only the migration channel of Ore-forming fluid, but also the place of minerals precipitate. Fracture provided the favorable channel and places of account, migration, sedimentation for ore-bearing hydrothermal.5. Logo for direct prospecting are rail cap, cloud of the British rock, pyritization, silicification and bleaching alteration; and indirect signs are Carboniferous in the EC group on mercerizing Ping paragraph (C2s2) formation which is controlled by the tectonic fracture zone in the way of North East.in the granite outside the contact zone.6. We delineated roughly three favorable metallogenic lot:southern part of Three holes-northern section of Laoxiong brood paragraph mine, between Panjia grave and Gold Rush Service, and Baisha slpoe-Snake hole area. |
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