Experimental diagenesis of organo-mineral structures formed by microaerophilic Fe(II)-oxidizing bacteria

被引：81

作者：

Picard, Aude ^{[1
]}

Kappler, Andreas ^{[1
]}

Schmid, Gregor ^{[1
]}

Quaroni, Luca ^{[2
]}

Obst, Martin ^{[1
]}

机构：

[1] Univ Tubingen, Ctr Appl Geosci, D-72076 Tubingen, Germany

[2] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland

来源：

NATURE COMMUNICATIONS | 2015年 / 6卷

基金：

加拿大自然科学与工程研究理事会; 加拿大创新基金会; 加拿大健康研究院;

关键词：

BANDED IRON-FORMATIONS; X-RAY SPECTROMICROSCOPY; BLUE-GREEN-ALGAE; GALLIONELLA-FERRUGINEA; IN-SITU; EXPERIMENTAL SILICIFICATION; ELECTRON-MICROSCOPY; OXIDIZING BACTERIA; WESTERN-AUSTRALIA; LOW-TEMPERATURE;

D O I：

10.1038/ncomms7277

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Twisted stalks are organo-mineral structures produced by some microaerophilic Fe(II)-oxidizing bacteria at O-2 concentrations as low as 3 mu M. The presence of these structures in rocks having experienced a diagenetic history could indicate microbial Fe(II)-oxidizing activity as well as localized abundance of oxygen at the time of sediment deposition. Here we use spectroscopy and analytical microscopy to evaluate if-and what kind of-transformations occur in twisted stalks through experimental diagenesis. Unique mineral textures appear on stalks as temperature and pressure conditions increase. Haematite and magnetite form from ferrihydrite at 170 degrees C-120MPa. Yet the twisted morphology of the stalks, and the organic matrix, mainly composed of long-chain saturated aliphatic compounds, are preserved at 250 degrees C-140MPa. Our results suggest that iron minerals might play a role in maintaining the structural and chemical integrity of stalks under diagenetic conditions and provide spectroscopic signatures for the search of ancient life in the rock record.

引用

页数：8

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