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Mawchi矿山位于缅甸Kayah州,北纬18°49′,东经97°10′,一般标高1.1Km(图1).在第二次世界大战前,Mawchi是世界上最大的锡和钨的产地之一.从1939到1940年,它生产了缅甸钨的总产量的60%,当时,缅甸的钨的总产量占世界钨的产量的17.4%.地质背景Mawchi矿区地质图见图2.这个地区以由砂岩、砂砾岩、钙质泥岩、页岩和灰岩组成的沉积岩系为特征;在矿区范围内被称为Mawchi系,它可以与Tennanserim的Tavoy地区内的Mergni系对比.一个小的花岗岩类侵入体侵位于Mawchi矿区的沉积岩中,并产生了一个低品位的热变质晕,由大理岩、石英岩、斑点砂砾岩和硬化板岩组成.Mawchi花岗岩类侵入体是Sn-W有关的.缅甸花岗岩带中最小的岩体之一.根据目前所获取的地层证据和K—Ar年代测定法(Garson等.1976:Mitehell,1977),这个带侵位的时代被认为是晚中
The Mawchi mine is located in Kayah State, Myanmar, at 18 ° 49’N and 97 ° 10’E with a general elevation of 1.1Km (Figure 1). Before World War II, Mawchi was one of the largest tin and tungsten producers in the world. It produced 60% of Burma’s total tungsten output from 1939 to 1940 when Burma’s total tungsten production accounted for 17.4% of the world’s tungsten production Geological Background The Mawchi mine geology map is shown in Figure 2. This area is dominated by sandstone , Glutenite, calcareous mudstone, shale and limestone, and Mawchi fauna within the mine area, which is comparable to the Mergni fac- tory in the Tavoy area of Tennanserim.A small granitic intrusive Invaded in the sedimentary rocks of the Mawchi mine area and produced a low-grade thermal metamorphic halo composed of marble, quartzite, speckled conglomerate and hardened slate, the Mawchi granitoid intrusive body is related to Sn-W, while the Burmese granite belt One of the smallest of the rock mass, based on the currently acquired stratigraphic evidence and K-Ar dating (Garson et al., 1976: Mitehell, 1977)