Abstract：
:Formation of microtubules in volcanic glass from subsurface environments has been widely attributed to in situ activity of micro-organisms, but evidence directly linking those structures to biological processes remains lacking. Investigations into the alternative possibility of abiotic tubule formation have been limited. A laboratory experiment was conducted to examine whether moderate-temperature hydrothermal alteration of basaltic glass by seawater would produce structures similar to those ascribed to biological processes. Shards of glass were reacted with artificial seawater at 150°C for 48 days. Following reaction, the shards were uniformly covered with a brick-red alteration rind 10-30 μm thick composed primarily of phyllosilicates. Inspection of the margins of reacted shards with light microscopy did not reveal any tubule structures. However, the alteration products did include features containing micron-sized spheroidal structures that resemble granular alteration textures, which some investigators have attributed to biological activity. This result suggests that the granular textures may be at least partially abiotic, and that biological activity may make a smaller contribution to alteration of the oceanic crust than has been previously proposed. Also, while the experimental results do not exclude the possibility that tubules form abiotically, they do place limitations on the conditions under which this may occur.
journal_name
Astrobiologyjournal_title
Astrobiologyauthors
McCollom TM,Donaldson Cdoi
10.1089/ast.2017.1811subject
Has Abstractpub_date
2019-01-01 00:00:00pages
53-63issue
1eissn
1531-1074issn
1557-8070journal_volume
19pub_type
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