| 关于赣中新余式铁矿多层次（位）的讨论 |
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| 引用本文：.1986.A Discussion On Multilayered Mineralization Of The Xinyu Type Iron Deposits In Central Jiangxi[J].Mineral Deposits,5(1):88~96 |
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| A Discussion On Multilayered Mineralization Of The Xinyu Type Iron Deposits In Central Jiangxi |
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| Abstract:Occurring in phyllite or schist of Upper Sinian Yangjiaqiao Formation (Figs. 1 and 2), the Xinyu type iron deposits are of metamorphosed volcanic-sedimentary origin. Their ores are composed mainly of quartz, magnetite and chlorite, characterized by striped structure, and contain 20-28% total iron. Being widespread and of considerable size, they are considered to be the main type iron deposits in Jiangxi Province. Concerning geological characteristics of these deposits, there have long esisted two different opinions of single-layer mineralization and multilayered minerelization. The former holds that originally only a single ore bed occurred which, through repeated folding, has been modified into the present various kinds of curved shapes, while the latter believes that multiple ore beds exist which are not so stable in shape and mostly take stratoid and lenticular forms showing such variations as branching, pinching out and reappearance, and that folding structures are quite simple, being mostly monoclinic ones as shown by drilling. In the light of lithostratigraphy, this paper presents mainly geological markers for multilayered mineralization, such as the regular sequence of strata along the section, the asymmetrical repeatition of the roof of the major ore bed (No. 3 ore bed)-chlorite schist (Fig. 3), different ore types for different ore beds (Fig. 5), the obvious distinction between the major and the minor ore beds (Fig. 4), the frequent concentration of magnetite on the bottom of the ore belt and the horizontal extension of ore beds in the section. These markers are consistent and remain stable in longitudinal and cross sections, in neighbouring mining districts and at both small and great depths (Fig. 6). The multilayered, mineralization and monoclinal strata revealed by these characteristics have also been substantiated by preliminary exploitation. |
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