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<正>几个世纪来,专家一直认为古埃及人沿着专门建造的坡道向上拖运沉重的花岗石块料,建造了巨大的金字塔。但英国纽波特工程师彼得·詹姆斯称这不可能,认为这样的坡道需要四分之一英里长,否则它们就会因过于陡峭而无法拖运这些巨大石料。这位专家说:"埃及人先用更小更轻的石块建造内部之字形坡道,然后通过脚 相似文献
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文章阐述了四川省汉源县脚鸡坪花岗石矿产出的地质特征,重点对矿区矿石的商品品色及矿石石材质量作了地质经济评价.其物理性能达到了美国石业研究所对花岗石材的指标要求。 相似文献
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灰白色花岗石废弃物在墙地砖中的应用 总被引:3,自引:0,他引:3
俞平利 《华侨大学学报(自然科学版)》2001,22(2):166-168
研究灰白色花岗石废弃物-石粉及碎料在墙地砖中的应用可能性,实验试样在900-1000度范围内,以1h左右时间烧结完成,结果表明,在熔剂质量分数为0.25-0.35时,大部分样品吸水率,抗冲击强度符合釉面砖的性能要求,部分样品符合或超过地砖的性能要求。 相似文献
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以扫描电子显微镜和透射电子显微镜为主要测试手段,研究了花岗石石材磨削抛光后其表面的微观结构特点,发现了花岗石抛光层的存在,以及抛光层内矿物为晶质的,进而得知花岗石的抛光机理是以热物理作用为主,微切削作用为辅 相似文献
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Geochronology and geochemistry of the Fangcheng Neoproterozoic alkali-syenites in East Qinling orogen and its geodynamic implications 总被引:5,自引:0,他引:5
ZhiWei Bao Qiang Wang GuoDian Bai ZhenHua Zhao YaoWu Song XiaoMing Liu 《科学通报(英文版)》2008,53(13):2050-2061
Finding of Neoproterozoic syenites at Fangcheng in the northern Qinling region of the East Qinling orogen provides an important constraint on timing of tectonic transformation to extensional regime. The alkaline pluton consists mainly of nepheline syenite, aegirine syenite, and alkali-feldspar syenite. The syenites are of intermediate (SiO2 = 54%-62%), rich in alkali (K2O+Na2O = 12%-15%), aluminum (Al2O3= 16.81%-23.26%) and large ion lithophile elements (LILE), without any obvious Nb, Ta, Zr, and Hf anomalies. The Fangcheng syenites are geochemically characterized by relative enrichment of LREE, minor differentiation of HREE, significant negative Eu anomalies (Eu = 0.13-0.23), less negative εNd(t) values of -1.37 to-3.90, young Nd model ages of 1364 to 1569 Ma, and high zircon saturation temperatures of 915 to 1044℃. The syenitic magmas probably originated from small proportion melting of upper mantle in an extensional regime of intraplate-anorogenic tectonic setting, and have been slightly contaminated by crustal materials during ascending and/or emplacement. LA-ICP-MS zircon U-Pb dating yields ages of 844.3±1.6 Ma (MSWD=0.86), suggesting that the Fangcheng alkaline syenites formed in the early Neoproterozoic. They are the oldest Neoproterozoic alkaline rocks ever recognized in the Qinling orogen as well as in South China. This implies that the tectonic regime of the Qinling region would have transformed from post-collisional stretch to intraplate-anorogenic extension no later than 844 Ma. 相似文献