Biologically induced iron ore at Gunma iron mine, Japan

首页> 外文期刊>The American mineralogist >Biologically induced iron ore at Gunma iron mine, Japan

【24h】

Biologically induced iron ore at Gunma iron mine, Japan

机译：Biologically induced iron ore at Gunma iron mine, Japan

获取原文

获取原文并翻译 | 示例

掌桥外文数据库（机构版） >>

开具论文收录证明 >>

文献代查 >>

页面导航

摘要
著录项
相关主题

摘要

The mineralogy of sedimentary iron ores from the Gunma iron mine are described to evaluate the role of microorganisms and plants in ore formation. The iron ore is composed of nanocrystalline goethite, well-crystallized jarosite and very small amounts of strengite. The ore characteristically occurs as thick-bands of alternating goethite and jarosite bands, thin-bands of different goethite grain sizes, and fossil-aggregate ore rich in moss and/or leaves. Algal fossils are clearly preserved in the goethite bands in the thick-banded ore. Lattice imaging showed characteristic crystallographic orientations of the goethite nanocrystals. The thin-banded iron ores consist of micrometer-sized chestnut-burr-like goethite aggregates, probably formed by bacterial iron biomineralization. The bands may be attributed to biological or seasonal rhythms. Various products of biomineralization are found in the present-day pH 2-3, Fe 2+ -, and SO 4 2- -rich streams. Bacterial precipitation had var- 4 iations from amorphous Fe-P-(S) precipitates near the outlet of mineral spring to Fe-P-S precipitates and to Fe-S-(P) (schwertmannite-like) precipitates in the midstream. Mosses and green algae are also collecting Fe precipitates in and around the living and dead cells. Comparison of the processes occurring in the present-day streams and the iron-ore specimens supports the interpretation of these ores as the product of biomineralization.

著录项

来源
《The American mineralogist》 |1999年第2期|171-182|共12页
作者

展开▼
作者单位

Department of Geology, Faculty of Science, Niigata University, Ikarashi-2, Niigata 950-2181, Japan;

Kamo-gyosei High School, Gakko-cho, Kamo 956-1322, Japan;

Department of Earth Science, Shiga University, Otsu 520, JapanLaboratory of Biology, Faculty of Humanities and Social Sciences, Iwate University, 3-18-34, Ueda, Morioka 020, JapanDepartment of Oral Anatomy, Nippon Dental University, Hamaura, Niigata 951-8151, Japan;

展开▼
收录信息
原文格式 PDF
正文语种英语
中图分类
关键词

Biologically induced iron ore at Gunma iron mine, Japan

摘要

著录项

相关主题

期刊订阅