Based on the knowledge of the shallow-level mylonitization of detrital rocks and intrusive rocks,the poorly-known cataclastic rheology of carbonate rocks is discussed compre-hensively in this paper.The cases taken from eastern China are analyzed in various aspects including ductile-brittle fault zone,rock texture and structure,clastomylonite layer,leucocratic stress minerals,and frictional dynamometamorphism.It is proposed that the cataclastic flow structure represented by clastomylonite texture is a cooling pattern of flow assemblage charac-terized by cooling metamorphism,cooling mylonite and cooling stress minerals.Such a pattern is formed generally in mildly reducing physicochemical environments,and is commonly related to regional tectonism and mesothermal and epithermal mineralization.
LU XiancaiSUN YanSHU LiangshuGU LianxingGUO JichunZHU Wenbin
Marine hydrogenous ferromanganese crust, an important metal resource in the future, has significant potential in various applications as a type of natural nano-structured material. By employing scanning electronic microscopy, nitrogen adsorption-desorption isotherm measurement, Xray fluorescence spectrometer and X-ray diffraction methods, the micro-structure, surface properties and chemical composition of several plate-like ferromanganese crusts sampled from the northwestern Pacific were investigated comprehensively. Although obvious differences were observed from different layers, the crust is a typical porous material with high specific surface area, unique pore structure and abundant transition elements. Furthermore, the performance of natural crust in desulfurization process was preliminarily tested in laboratory experiments. The suffur capacities of the crust are 13.1% and 18.1% at room temperature and 350 ℃, respectively. The crust can be used not only as a metal resource, but also as an environmental material.
LU Xiancai HOU Qingfeng LIU Xiandong YANG Kan WANG Rucheng LING Hongfei XU Shijin
