排序方式: 共有83条查询结果,搜索用时 31 毫秒
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四川盐边冷水箐岩体铂族元素的中子活化分析李晓林,汪云亮,肖庆帘(成都理工学院,成都610059)关键词铂族元素,中子活化分析,镍锍试金为在川西地区寻找超大型硫化Cu-Ni-Pt矿床,需要对比剖析一些有关岩体。冷水箐岩体是研究对象之一。准确测定其铂族元... 相似文献
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沉积岩系互稀释混合元素丰度关系 总被引:3,自引:0,他引:3
二元混合成国岩石元素丰度(x,y)遵守分式线性函数定律:式中a,b,c,d为丰度关系常数,它们只和岩系中两个已知岩石(1和2)中元素丰度(x1,y1;x2,y2)有关,并等于其镜像∑变换(混合变换)(a,b,c,d)=∑∑|x1,y1;x2,y2|(2)元素丰度关系常数中,如果b与C之比值小于零时,元素丰度y=X呈互稀释混合关系。 相似文献
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Trace Element Abundance Relationships in the Multi—stage Comagmatic Fractional Crystallization and Their Applications 总被引:1,自引:0,他引:1
In this study a mathematical expression of trace element abundance relationship for the mul-ti-stage comagmatic fractional crystallization has been established ,based on geochemical studies of the Emeishan basalt-trachyte series and adjacent mafic-ultramafic layered intrusions, as well as on the avail-able data for basalt, andesite, dacite and rhyolite series in southern Andes,Chile ,which have been well documented.It is demonstrated that the abundance constant (R) for a given trace element at dif-ferent stages of fractional crystallization of a parental magma is highly variable,which can be used as a criterion to divide fractional crystallization stages. 相似文献
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A primary magma not only represents the starting point of a fractional crystallization process, but also is the product of an equilibrium or fractional partial melting process in a mantle.Element abundance relationships in the primary magma obey both law of power function for fractional crystallization and the law of fractional linear function for equilibrium partial melting .Based on this double nature of the primary magma, the authors advanced a principle to restore the primary magma composition from that of an igneous rock series with petrogenesis of fractional crystallization and put forward an approach of estimating the element abundance of the primary magma, exempli-fied by the rar-earth elements in the Andes volcanic rock series. 相似文献
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早泥盆世-中泥盆世早期的右江盆地处于被动陆缘裂陷盆地阶段.本文通过对这一时期右江盆地的沉积层序、构造演化、古气候以及全球海平面等因素的综合分析,建立了右江被动陆缘裂陷盆地的层序充填动力学模型.该模型充分体现了构造控盆、盆控相,不同相带的时空配置形成层序的不同样式的基本思想,强调了构造沉降和全球海平面升降共同作用下的相对海平面变化所引起的可容纳空间的变化与沉积物供应比值的关系对层序样式的决定作用.通过代表台缘相的横县六景剖面的验证,该模型清楚地反映了全球海平面变化对超层序的主要控制作用,区域构造沉降的叠加效应使相对海平面曲线的R拐点要早于全球海平面曲线的R拐点,而F拐点要晚于全球海平面曲线的F拐点.古气候因素体现在层序充填物(气候敏感沉积物的种类、生物种属的差别)的差异性上.本文所建立层序充填动力学模型的思路和方法对于其他地区、其他类型盆地类似的研究具有借鉴意义,由此建立的被动陆缘裂陷盆地的层序充填动力学模型对于了解右江盆地的构造动力学与特提斯构造域的关系、促进盆地动力学理论的发展和该区的资源勘探具有重要的理论意义. 相似文献
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The platinum group elements(PGE)in the mafic-ultramafic suite in the Xinjie layered intrusion and associated basalts and syenites were analyzed using neutron activation techniques after fire-assay preconcentration.On this basis,the geochemistry of the platinum group during the magmatic stage is discussed.With respect to PGE distribution,the Xijie layered intrusion is similar to the Bushveld ferruginous ultramafic series and is distinct from komatiite and Alpine-type peridotite.It is also similar to the Emeishan basalt in PGE characteristics,implying that the original magmas of them may be of the same type. 相似文献
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峨眉火成岩省:结构、成因与特色 总被引:10,自引:0,他引:10
峨眉火成岩省既有其它大火成岩省(如印度德干火成岩省)的一般特征,更独具中国特色:其形成于全球性重大地质变革——大陆敛合与解体的大背景之下,和板块构造体制向大陆构造体制转化过渡的关键时期;处于东部滨太平洋构造域与西部古特提斯构造域的交汇、叠加与枢纽部位;显示清楚完好的地幔热柱“头冠”与“尾柱”轮廓;火成岩省岩石圈存在异常显著的地幔热—侵蚀作用;火成岩省西部发育三套各具特色的成矿系统。深入研究峨眉火成岩省,不仅可提供中国境内地幔热柱岩浆作用典型实例,而且可深刻理解大陆岩石圈深部作用过程和大陆动力学程式,以及大规模成矿作用的深部约束机制。 相似文献
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