S. J. Luft
1966
<p><span>Small, vertically elongate concretionlike structures, here called </span>rhizoconcretions<span>, are found </span>in<span> scattered localities </span>in<span> and near the southern part of the Belted Range of </span>Nye<span> </span>County<span>, </span>Nevada<span>. The </span>rhizoconcretions<span> occur within a stratigraphically restricted zone </span>in<span> bedded </span>vitric<span> </span>ash<span>-</span>fall<span> </span>tuff<span> of late Tertiary age. The </span>rhizoconcretions<span> differ </span>in<span> mineralogy from their host rock </span>in<span> that they are cemented by a binder of undetermined composition, possibly a zeolite, whereas the host tuffs are un-cemented. These structures appear to have formed during diagenesis of the </span>tuff<span> by means of capillary movement of subsurface waters that reacted with volcanic glass within the conduits to form the cementing material. </span></p>
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10.1130/0016-7606(1966)77[313:RIVATN]2.0.CO;2
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Geological Society of America
Rhizoconcretions in vitric ash-fall tuff, Nye County, Nevada
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