Microbes in Cave Appear To Be Source of Rock Varnish
نویسندگان
چکیده
منابع مشابه
Astrobiological implications of rock varnish in Tibet.
The study of terrestrial geomicrobiology and its relationship to rock weathering processes is an essential tool in developing analogues for similar processes that may have occurred on Mars. Most studies of manganese-enhanced rock varnish have focused on samples taken from warm arid desert regions. Here, we examine samples obtained from eolian-abraded lava flows of the 4700-4800 m high Ashikule ...
متن کاملOxidation State of Manganese in Rock Varnish
Rock varnish is generally understood to be a 5-500 micrometer thick nanostratigraphic coating consisting of approximately 70% clay glued together by 30% iron and manganese oxides, which forms on the surfaces of rocks in most semi-arid to hyper-arid climates. Many investigators believe that manganese exists in rock varnish mainly as birnessite, and that varnish has at least a partial biological ...
متن کاملPreliminary XPEEM Analysis of Rock Varnish
We have performed preliminary mapping of the manganese and iron present in a cross-section of a rock varnish from the Cima volcanic flows in the Mojave Desert, California. Rock varnish is a nanostratigraphic deposit found on typically fine-grained rocks in hyper-arid to semi-arid deserts (Figure 1a) [1]. Rock varnish is defined as consisting of about 70% clay particles held together by about 30...
متن کاملrock engravings of ghalat niloo cave
painted rocks may be considered the oldest manifestation of art in human society. the history of this art is estimated to be more than 30 thousand years. this art has also a long history in iran. this article introduces one of these rock art sites i.e. ghalat niloo which is located in kazeroon county, south-east of ghalat niloo village. the purpose of this study is to identify and determine th...
متن کاملCation-Ratio Dating: A New Rock Varnish Age-Determination Technique
Rock varnish coats many surfaces of geomorphic and archaeologic interest in arid lands. All varnish dating techniques are limited by the time lag between the exposure of a surface to subaerial processes and the onset of varnishing. They are valid only where manganese is not remobilized after deposition, for example, in most arid environments. The premise of a new age-determination method, catio...
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ژورنال
عنوان ژورنال: Microbe Magazine
سال: 2010
ISSN: 1558-7452,1558-7460
DOI: 10.1128/microbe.5.238.1