前寒武系对东秦岭-大别山钼成矿带成钼作用的贡献

对东秦岭-大别山钼成矿带25个钼矿床成矿母岩外接触带的地层及围岩观察统计,可清楚表明,所有钼矿床的赋矿层位均为前寒武纪老地层。成矿母岩侵入寒武系及以后地层中均形不成工业矿床。前寒武系不同的围岩岩性对钼矿床成矿作用的影响也不尽相同。主要反映在:1.地幔分异熔浆上侵时易于捕获前寒武系有用组分钼,而成其主要矿源层;2.成矿母岩的围岩岩性对矿床主要矿种组合有重要制约作用;3.围岩的物理力学性质,尤其是围岩的抗压抗剪强度(即岩石的破裂程度)对钼矿富集起关键作用。围岩容矿裂隙的发育程度决定了矿石的品位,从而控制着矿床的规模。东秦岭-大别山钼成矿带进一步寻找钼矿资源应以前寒武系(尤其是元古代老地层)作为找矿首选区域,特别是元古界岩石组合中的火山岩系列、大理岩及片岩系列构成的成矿有利围岩的地区。

The Application of Ultrasonic in the Refining of Waste Silk Material

The treatment effect of ultrasonic on waste silk material was studied in this paper. The results show that Ultrasonic can emulsify the pupal fat and accelerate the dissolving of sericin. For high pupal fat containing material, high temperature, high pH value and long time which may result in damage to silk fibre are not required and different levels of sericin can be kept according to requirement in ultrasonic refining. In addition, silk fibres are swollen and the breaking elongation of silk fibre is increased on prolonged ultrasonic treatment. But the breaking tenacity is damaged slightly.