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In this paper the petrogenesis and magmatism of igneous rocks in the Panxi Rift are discussed based on the major element, transition metallic element, REE and other trace element analysis data of more than 40 samples.According to major element data, a feature of bimodal distribution is displayed. The transition metal patterns show that Cr and Ni are highly depleted and Ti is highly concentrated, reflecting a rather complex history of crystallization differentiation.The distribution patterns of hygromagmatophile element abundance of basalts normalized with primary mantle values are shown to be intermediate between those of alkali basalts and continental tholeiites. This provides evidence suggesting that the basalts were generated in a rift tectonic environment, and that the primary magma came deeply from the primary mantle as a result of partial melting of garnet lherzolite. 相似文献
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中子活化分析在古陶瓷原料产地研究中的应用 总被引:11,自引:4,他引:7
介绍了用中子活化分析方法测量古陶瓷和仿古陶瓷中的微量元素,通过对这些测量数据进行模糊聚类分析 ,可以确定这些古陶瓷和仿古陶瓷的材料来源 ,寻找提高仿古陶瓷质量的途径.Trace-elements in ancient ceramics and imitative ancient ceramics were determined by neutron activation analysis (NAA). The NAA data are then analyzed by fuzzy cluster method and the trend cluster diagram is obtained.The raw material sources of ancient ceramics and imitative ancient ceramics are determined. The path for improving quality of imitative ancient ceramics is found. 相似文献
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本文从理论上探索了在放射性绝对测量中,降低由衰变常数的不准确性和测量统计性所引入的误差。发现以寿期为中心的前后对称测量法可以达到这样的要求,即使衰变常数的误差达到±10%,由零时和两个寿期时测量的结果,分别计算得出的在零时的放射性原子数的平均值由衰变常数的不准确性引入的误差仍小于0.1%。用99mTc衰变的实验数据,在测量统计性范围内证实了以上论点。故,用以寿期为中心的前后对称测量法,将测量时间尽量提前,既可减少由衰变常数的不准确性所引入的误差,又可有较好的测量统计性,使绝对测量的结果更准确。 相似文献
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本文依据攀枝花-西昌裂谷四十几个火成岩的主要元素、过渡金属元素、稀土元素和其他微量元素的分析结果,探讨了这些岩石的成因和岩浆过程。从主要元素成分来看,明显地显示出双众数岩套的特征。过渡金属元素显示了Cr和Ni的强烈亏损与Ti的明显富集,反映了复杂的结晶分离作用历史。所有岩石的稀土元素分配型式都是富集型的,暗示出原始岩浆可能来自原始地幔的低程度部分熔融,玄武岩的亲石岩浆元素丰度经原始地幔值标准化后的分配型式,显示出一种介于碱性玄武岩与大陆拉斑玄武岩之间的图形,这支持了它们的裂谷大地构造环境,也暗示了原始岩浆来自深处的原始地幔区,可能是石榴二辉橄榄岩部分熔融的产物。 相似文献
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