supermature

supermature

[¦sü·pər·mə′chu̇r]
(geology)
Pertaining to a texturally mature clastic sediment whose grains have become rounded.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The best frac sands are supermature quartz arenites that owe their physical and chemical characteristics to their origin as marine shoreline sands that were multiply reworked by wind and water (Winfree, 1983), were never deeply buried, or they later underwent diagenesis or intense chemical weathering that reduced or removed cements (Dott and others, 1986; Dott, 2003).
* lower Paleozoic supermature quartz arenites deposited on a broad, low-relief (shallow) marine shelf (Sloss, 1988), bordering a slowly subsiding, relatively stable, continental interior basin (Sloss, 1988; Runkel and others, 2007);
(4) Supermature stage: sediments do not contain clay, and the sand grains are well sorted and well rounded (Waddel roundness over 0.35; [rho] over 3.0).
(1995) cited the mineralogically supermature nature of the sandstone and conglomerate and the stratigraphic continuity of the units as evidence for a placer origin for the gold and uranium.