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首页> 外文会议>International Symposium on Mine Planning and Equipment Selection >The Malenco Serpentinite (Sondrio, Northern Italy): petrography, geochemistry and mechanical properties
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The Malenco Serpentinite (Sondrio, Northern Italy): petrography, geochemistry and mechanical properties

机译：Malenco Serpentinite（Sondrio，意大利北部）：岩画，地球化学和机械性能

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The Malenco serpentinite was quarried and used as a dimension and building stone since the XI century. Nowadays there are 22 active quarries that produce 70000 m3/yr of “massive” and schistose serpentinite. The schistose variety is mainly splitted in thin slabs for roof covering, whereas the “massive” serpentinite is commercialized in 6 varieties and processed in many ways. All the varieties have been characterised by petrographic analysis, SEM-EDS, quantitative XRPD and whole rock geochemistry. Mechanical properties have been also considered: water absorption, porosity, compressive strength, flexural strength, abrasion resistance. The mineralogical composition is characterized by various generations of antigorite, olivine, diopside, chlorite, magnetite and little amounts of chromite, Fe-Ni alloys, Fe-Ni sulphides, Ti-clinohumite and chrysotile (only in veins). The serpentinite varieties show non-pseudomorphic textures, marked foliation and fine grain size. The mineralogical composition has been quantified by XRPD, running the FULLPAT software, which always evidences an excellent fit and little errors in phase quantification (< 5 wt. percent ). The antigorite content is extremely variable (50--90 wt. percent ). The geochemical data (majors, minors and trace elements) evidence a moderate variability in Al_2O_3 (0.78--2.83 wt. percent ) and CaO (0.15--3.14 wt. percent ), whereas Fe_2O_3 is generally constant. The LOI is variable (4.1 2000 ppm) contents are rather high. The REE patterns suggest homogeneous condritic trends, sometimes with slight LREE enrichments. The serpentinite shows a good and homogeneous wear resistance (Amsler test, 5.93--9.19 mm). The flexural strength is influenced by the grain size and the planar anisotropy, with excellent values between 25.4 MPa and 83.9 MPa. The compression break load (98.9--219.4 MPa) is anisotropic among the varieties as a function of the load applied parallel or perpendicular to the foliation of the rock. The water absorption value is very low (0.04--0.18 wt. percent ) for all the commercial varieties, as well as the porosity (0.02--0.18 vol. percent , determined by Hg-porosimeter). The workability and the mechanical properties of the serpentinite are strongly influenced by textural and mineralogical features. The mechanical properties make the Malenco serpentinite an excellent material especially for paving, shelving, coverings in areas with significant wear.
机译：自二十世纪以来，马伦戈蛇型素被争吵并用作维度和建筑石头。如今，有22种有效的采石场，产生70000 m3 / yr的“巨大”和schistose serpentinite。 Schistose品种主要在屋顶覆盖物的薄板中分裂，而“大规模”蛇形矿石在6个品种中商业化，并以多种方式处理。所有品种的特点是岩体分析，SEM编辑，定量XRPD和整个岩石地球化学。机械性能也被考虑：吸水，孔隙率，抗压强度，弯曲强度，耐磨性。矿物学组合物的特征在于各代的抗真菌，橄榄石，透过，亚氯酸盐，磁铁矿和少量铬铁矿，Fe-Ni合金，Fe-Ni硫化物，Ti-ClinoHumite和Chrysotile（仅在静脉中）。蛇形素品种显示非假象纹理，标记叶和细粒尺寸。矿物学组合物已通过XRPD量化，运行FullPat软件，这些软件总是证明相位量化的优异良好和误差（<5重量％）。抗真菌含量极为变量（50-90重量％）。地球化学数据（专业，未成年人和微量元素）证据证明AL_2O_3（0.78-2.83重量％）和CAO（0.15--3.14重量％）中的中等变异性，而FE_2O_3通常是恒定的。由于蛇形化程度，LOI是可变的（4.1 2000 ppm）内容相当高。 REE模式表明了均匀的抗议趋势，有时患有轻微的富含浓缩。蛇形矿体显示出良好且均匀的耐磨性（AMSLER测试，5.93--9.19毫米）。弯曲强度受晶粒尺寸和平面各向异性的影响，具有25.4MPa和83.9MPa的优异值。压缩断裂载荷（98.9--219.4MPa）是品种的各向异性，作为载荷平行或垂直于岩石叶的载荷的函数。对于所有商业品种，吸水值非常低（0.04--0.18重量％），以及孔隙率（0.02--0.18体积％，由Hg-porosimeter确定）。蛇形素的可加工性和机械性能受到纹理和矿物学特征的强烈影响。机械性能使Malenco Serpentinite成为一个优质的材料，特别是用于铺设，搁架，覆盖物，在具有显着磨损的区域。

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