Arid
DOI10.1002/esp.3644
Insights into the formation of rock varnish in prevailing dusty regions
Aulinas, M.1; Garcia-Valles, M.2; Fernandez-Turiel, J. L.3; Gimeno, D.1; Saavedra, J.4; Gisbert, G.1
通讯作者Garcia-Valles, M.
来源期刊EARTH SURFACE PROCESSES AND LANDFORMS
ISSN0197-9337
EISSN1096-9837
出版年2015
卷号40期号:4页码:447-458
英文摘要

The characteristics of rock varnish from the Campo de Piedra Pomez (CPP, Andes Argentina) provides new insights into the development of rock varnish under severe dusty conditions. The CPP varnish has been analysed using SEM-EDAX and Raman techniques. The rock coating is tens of microns in thickness and under the microscope shows a micro to cryptocrystalline appearance and a general granular texture. Silica (quartz, cristobalite and amorphous silica) is the main phase forming these coverings followed by Al, K and Na compounds. Minor Fe oxides and Mn oxides are the source for the orange (Fe) and brown (Fe and Mn) hues of the coating. The results obtained for the CPP coating show that desert varnish developed under dusty circumstances does not have the appearance of typical rock varnish. Textural characteristics include high crystallinity and granular arrangement of the components. Moreover the absence of typical microlaminations is related to the presence of aeolian mineral grains which inhibit their development. The main mechanism of formation of rock varnish under such environmental circumstances is the direct incorporation of aeolian mineral grains into the varnish. However, other physicochemical processes are also required to explain the formation of varnish components such as amorphous silica or iron oxides phases. Although the development of the desert varnish may act as a protector of the underlying pyroclastic rock, the extreme and persistent windy conditions in the CPP field are high enough to weather and erode not only the rock coating but also the original ignimbrite. As other warm desert sites on Earth, the CPP area can also be considered as possible terrestrial analogue to Mars. Some environmental attributes might be similar to those expected on the Martian surface and thus, textural similarities between the CPP varnish and the rock varnish-like coating of Mars are likely. Copyright (c) 2014 John Wiley & Sons, Ltd.


英文关键词rock varnish dusty environment hyper-arid desert climate crystalline coating Martian analogue
类型Article
语种英语
国家Spain
收录类别SCI-E
WOS记录号WOS:000351612100002
WOS关键词DESERT VARNISH ; BIOMINERALIZATION PROCESSES ; MONUMENT SURFACES ; STAINED-GLASS ; COATINGS ; RAMAN ; MARS ; DEPOSITION ; SILICA ; MINERALOGY
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/186710
作者单位1.Univ Barcelona, Fac Geol, Dept Geoquim Petrol & Prospeccio Geol, E-08028 Barcelona, Spain;
2.Univ Barcelona, Fac Geol, Dept Cristal Log Mineral & Diposits Minerals, E-08028 Barcelona, Spain;
3.ICTJA CSIC, Inst Earth Sci J Almera, Barcelona 08028, Spain;
4.CSIC, IRNASA, Salamanca 37008, Spain
推荐引用方式
GB/T 7714
Aulinas, M.,Garcia-Valles, M.,Fernandez-Turiel, J. L.,et al. Insights into the formation of rock varnish in prevailing dusty regions[J],2015,40(4):447-458.
APA Aulinas, M.,Garcia-Valles, M.,Fernandez-Turiel, J. L.,Gimeno, D.,Saavedra, J.,&Gisbert, G..(2015).Insights into the formation of rock varnish in prevailing dusty regions.EARTH SURFACE PROCESSES AND LANDFORMS,40(4),447-458.
MLA Aulinas, M.,et al."Insights into the formation of rock varnish in prevailing dusty regions".EARTH SURFACE PROCESSES AND LANDFORMS 40.4(2015):447-458.
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