| 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 |
| |
| 引用本文： | 范德廉,杨秀珍,王连芳,陈南生.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[J].地球化学,1973(3):i001-i002. |
| |
| 作者姓名： | 范德廉 杨秀珍 王连芳 陈南生 |
| |
| 摘 要： | 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.
|
| 关 键 词： | 下寒武统 岩石学 黑色岩系 地球化学 |
| 本文献已被 CNKI 维普 等数据库收录！ |
|
