Arid
DOI10.1007/s12040-015-0618-1
Spectroscopy of olivine basalts using FieldSpec and ASTER data: A case study from Wadi Natash volcanic field, south Eastern Desert, Egypt
Madani, Ahmed1,2
通讯作者Madani, Ahmed
来源期刊JOURNAL OF EARTH SYSTEM SCIENCE
ISSN2347-4327
EISSN0973-774X
出版年2015
卷号124期号:7页码:1475-1486
英文摘要

This paper aims at revealing the spectral characteristics of the olivine basalts exposed at Wadi Natash area, Egypt, using FieldSpec spectroradiometer. It also evaluates band ratios and fusion techniques for mapping purposes using ASTER data. Several volcanic episodes occurred during Early- to Late-Cretaceous are recorded in the study area. Early-Cretaceous olivine basalts are highly carbonated. Late-Cretaceous eruptions took place throughout several volcanic cones aligned in NW direction. Based on FieldSpec measurements and petrographic data, two groups of olivine basalt namely ’A’ and ’B’ are recognized. Fresh olivine basalt (group A) is characterized by low flat spectral profile with overall low reflectance values (similar to 20%). Spectral profile of altered olivine basalt (group B) shows moderate reflectance values (similar to 37%) with four little absorption features around the 1.10, 1.40, 2.00 and 2.35 mu m wavelength regions. These absorption features are attributed mainly to the presence of chlorite and carbonate alteration products as indicated by petrographic examination. ASTER false colour composite band ratio image (3/2:R, 8/1:G and 8/5:B) discriminates easily the fresh and altered basalts by deep blue and reddish blue colours respectively. Image fusion between previously mentioned FCC ratios image and high spatial resolution ASTER panchromatic image are carried out using brovey and HSV transformation methods. Visual and statistical assessment methods proved that HSV fusion image yields better image interpretability results compared to brovey image. It improves the spatial resolution of original FCC ratios image with acceptable spectral preservation. The present study proved the usefulness of FieldSpec spectral profiles and the processed ASTER data for discriminating different olivine basalt groups exposed at the study area.


英文关键词FieldSpec data olivine basalts ASTER data band ratios brovey-HSV techniques
类型Article
语种英语
国家Saudi Arabia ; Egypt
收录类别SCI-E
WOS记录号WOS:000363024300008
WOS关键词REFLECTANCE ; PYROXENES ; MINERALS ; CHEMISTRY ; SPECTRA
WOS类目Geosciences, Multidisciplinary ; Multidisciplinary Sciences
WOS研究方向Geology ; Science & Technology - Other Topics
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/188529
作者单位1.King Abdulaziz Univ, Water Res Ctr, Jeddah 21589, Saudi Arabia;
2.Cairo Univ, Dept Geol, Fac Sci, Giza, Egypt
推荐引用方式
GB/T 7714
Madani, Ahmed. Spectroscopy of olivine basalts using FieldSpec and ASTER data: A case study from Wadi Natash volcanic field, south Eastern Desert, Egypt[J],2015,124(7):1475-1486.
APA Madani, Ahmed.(2015).Spectroscopy of olivine basalts using FieldSpec and ASTER data: A case study from Wadi Natash volcanic field, south Eastern Desert, Egypt.JOURNAL OF EARTH SYSTEM SCIENCE,124(7),1475-1486.
MLA Madani, Ahmed."Spectroscopy of olivine basalts using FieldSpec and ASTER data: A case study from Wadi Natash volcanic field, south Eastern Desert, Egypt".JOURNAL OF EARTH SYSTEM SCIENCE 124.7(2015):1475-1486.
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