DOI: 10.1111/gbi.12184
Scopus记录号: 2-s2.0-84983591259
论文题名: Complex patterns in fossilized stromatolites revealed by hyperspectral imaging (400-2496 nm)
作者: Murphy R.J. ; Van Kranendonk M.J. ; Kelloway S.J. ; Wainwright I.E.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2016
卷: 14, 期: 5 起始页码: 419
结束页码: 439
语种: 英语
Scopus关键词: calcium carbonate
; aluminum compound
; biogenic material
; biomarker
; complexity
; dolomite
; infrared imagery
; lacustrine environment
; marine environment
; petrography
; spectral analysis
; stromatolite
; thin section
; X-ray diffraction
; chemistry
; fossil
; sediment
; spectroscopy
; surface property
; Calcium Carbonate
; Fossils
; Geologic Sediments
; Spectrum Analysis
; Surface Properties
Scopus学科分类: Earth and Planetary Sciences: General Earth and Planetary Sciences
; Environmental Science: General Environmental Science
; Agricultural and Biological Sciences: Ecology, Evolution, Behavior and Systematic
英文摘要: Hyperspectral imaging (400-2496 nm) was used to quantitatively map surface textures and compositional variations in stromatolites to determine whether complexity of textures could be used as evidence to support biogenicity in the absence of preserved biomarkers. Four samples of 2.72-2.4 Ga stromatolites from a variety of settings, encompassing marine and lacustrine environments, were selected for hyperspectral imaging. Images of the sawn surfaces of samples were processed to identify reflectance and mineral absorption features and quantify their intensity (as an index of mineral abundance) using automated feature extraction. Amounts of ferrous iron were quantified using a ratio of reflectance at 1650 and 1299 nm. Visible near infrared imagery (400-970 nm) did not reveal additional textural patterns to those obtained from visual inspection. Shortwave infrared imagery (1000-2496 nm), however, revealed complex laminar and convoluted patterns, including a distinctive texture of sharp peaks and broad, low troughs in one sample, similar to living tufted microbial mats. Spectral analysis revealed another sample to be composed of dolomite. Two other samples were dominated by calcite or chlorite ± illite. Large variations in amounts of ferrous iron were found, but ferric iron was exclusively located in the oxidation crust. Hyperspectral imaging revealed large differences between parts of a sample of biogenic and non-biogenic origin. The former was characterized by calcite with varying amounts of ferrous iron, distributed in lenticular, convoluted patterns; the latter by Mg-Fe chlorite with large amounts of aluminium silicate, distributed as fine laminar layers. All minerals identified by hyperspectral imaging were confirmed by thin section petrography and XRD analyses. Spatial statistics generated from quantitative minerals maps showed different patterns between these different parts of the sample. Thus, hyperspectral imaging was shown to be a powerful tool for detecting structures in stromatolites that could be used, together with other lines of evidence, to support biogenicity. © 2016 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85093
Appears in Collections: 影响、适应和脆弱性
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作者单位: Australian Centre for Field Robotics, Department of Aerospace, Mechanical & Mechatronic Engineering, The University of Sydney, NSW, Australia; Australian Centre for Astrobiology, and School of Biological and Earth and Environmental Sciences, University of New South Wales, Kensington, NSW, Australia; XRF Laboratory, Solid State and Elemental Analysis Unit, Mark Wainwright Analytical Centre, University of New South Wales, Kensington, NSW, Australia
Recommended Citation:
Murphy R.J.,Van Kranendonk M.J.,Kelloway S.J.,et al. Complex patterns in fossilized stromatolites revealed by hyperspectral imaging (400-2496 nm)[J]. Geobiology,2016-01-01,14(5)