排序方式： 共有23条查询结果，搜索用时 97 毫秒
1.
2.
桂西北金牙金矿床的物质来源探讨 总被引：3，自引：0，他引：3
该矿床是桂西北典型的微细浸染型金矿床。本文通过地层含金性比较、矿体外围的金负异常、Li与Au的相关性、稳定同位素、有机质特征及模拟实验等方面的分析,探讨了金牙金矿床中成矿元素的物质来源,认为中三叠统板纳组是主要的矿源层。 相似文献
3.
桂西北中三叠统板纳组浊积岩系是该区微细浸染型金矿床的主要赋矿层位。浊积岩中金丰度受到沉积物来源、沉积速率、岩石类型、碎屑物组份、碳酸盐化、绿泥石化等沉积、成岩作用的影响。 相似文献
4.
6.
某地下寒武统含镍钼多元素黑色岩系的岩石学及地球化学特点 总被引：29，自引：0，他引：29
Studies of sedimentology, ore micrascopy and geochemistry have been carried out on a Ni- Mo- multi-element-bearing black shales of the Lower Cambrian Niutitang Formation. Chemical analyses, electronprobe analyses, X-ray powder diffraction methods,optical, spectrographic and DTA techniques and electron photomicrographs arc also used in the research. Conclusive information has been obtained about the mode of occurrence of nickel,molybdenum and other elements, about their distribution within the Niutitang Formation, and about their concentrations in various types of sedimentary rocks. A preliminary discussion is also given to the depositional sequence of the Niutitang Formation as well as to thc controlling factors for the enrichment of these elements. Nickel and molybdenum are mainly enriched in thin-bedded and leuticular bodies within which Pt, Pd, Os, Au, TR, Se, T1, Cu, Zn etc. are also concentrated, showing a complex assemblage of elements and various occurrences. Major ore minerals are vaesite, polydymite, millerite, gersdorffite, jordisite, pyrite, chalcopyrite, tennantite.sphalerite. Gold and silver occur as Ag-bearing native gold. Barium is presented as barite. Selenium and thallium are considered to be related to pyrite. Rarc earths, on the other hand, are concentrated in phophorite and phosphorous nodules. The black shales have undergone sedimentation-diagenesis, epigenetie alteration and secondary oxidation. The depositional environment was strongly reducing. Organic materials played a definite part in the formation of siliceous matter, pyrite and some other sulfides. Nickel-molybdenum-multi-element-rich beds are found in the transitional zone from phosphorite to hlae.k siliceous rocks. It is believed that changes in depositional environment are the principal factors controlling the enrichment of the multi-element. 相似文献
7.
桂西北中三叠统板纳组地层中金的分布及地质意义 总被引：2，自引：1，他引：2
桂西北板纳组中金的丰度是不均一的，在区域上可分为富集区、贫化区和原始区，其中富集区和贫化区是成矿的有利区域。金丰度受岩石类型、沉积环境、成岩作用和成矿期金的活化迁移作用的影响。 相似文献
8.
9.
10.
Sinian strata (isotopic ages ranging from 1900-850 m.y.) in Oihsien, county and its vicinity have been studied in more detail from the standpoint of sedimentary geochemistry. Average chemical composition of various sedimentary rocks in the Sinian sequence (sandstone, siltstone, shale, dolomite and limestone) have been calculated.The periodicity and general trend as exhibited in the course of evolution of element association have been demonstrated by mathematical statistics based on numerious chemical analyses and semiquantitative spectroscopic data with the aid of electronic computer. In accordance with the above results the classification of elements are proposed on a more reasonable ground. Considerable attention has been paid to the periodicity and evolutionary eharacterictics of rocks, minerals and elements. The mode of occurrence of elements is examined in the light of trace-element concentrations and the relative coefficients between them in different components (clastic debris, clay, and ete.) from a variety of rocks and carbonates. Finally, the relationship between background abundances of elements and mineralization, and the effect of submarine eruption on sedimentation and the enrichment of some elements, for example, K, St, Mn, B, P, Pb and Zn, have also been dealt with. 相似文献