MINERALOGY AND GEOCHEMISTRY OF REDUCTION SPHEROIDS IN RED BEDS
MINERALOGY AND GEOCHEMISTRY OF REDUCTION SPHEROIDS IN RED BEDS
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DOI：
10.1007/bf01167103
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发表时间：
1991-01-01
影响因子：
1.8
通讯作者：
HOFMANN, BA
中科院分区：
文献类型：
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作者：
HOFMANN, BA
对欧洲、北美和阿曼的陆相和海相红层中的还原球粒进行了矿物学和地球化学研究。 还原球状体是赤铁矿中孤立的球状还原部位。 它们由矿化核（直径0.1至5厘米）和赤铁矿溶解晕（直径1至20厘米）组成。 无论寄主岩石的起源和年龄如何，所有还原球状核都显示出以钒云母红云母为主的非常相似的矿物学，以及相对于以V和U为主的寄主岩石的相似的元素富集模式。 元素富集在大多数还原球体是非常相似的砂岩托管钒铀矿床，除了缺乏钼富集。 同位素轻硫化物的原位，低温起源是一个迹象，参与细菌硫酸盐还原过程中还原球体的形成。
The mineralogy and geochemistry of reduction spheroids from continental and marine red beds of Europe, North America and Oman were investigated. Reduction spheroids are spheroidal, isolated reduction sites in hematitic rocks. They consist of a mineralized core (0.1 to 5 cm diameter) and a hematite-dissolution halo (1 to 20 cm diameter). Irrespective of origin and age of host rocks, all reduction spheroid cores show a very similar mineralogy dominated by the vanadian mica roscoelite and a similar pattern of element enrichment relative to their host rocks dominated by V and U. Element enrichments in most reduction spheroids are very similar to those of sandstone-hosted vanadium-uranium deposits except for a lack of a molybdenum enrichment. Isotopically light sulfide of in-situ, low-temperature origin is an indication for the involvement of bacterial sulfate reduction during reduction spheroid formation.