pisolite


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pisolite

[′pī·zə‚līt]
(petrology)
A sedimentary rock composed principally of pisoliths.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
On the lower plains, which had slopes between 1[degrees] and 2[degrees], soils had developed in pisolite slope deposits and river deposits.
Purchases from various dealers including a large pisolite from Carlsbad at 5 ducats (30 Ecus.), stalactites and fossil wood.
The following results are crude totals only and do not include any assessment of excluding iron-rich pisolite layers during mining.
During the June quater of 2010 focus of exploration moved to the northeastern corner of E47/1309 where there is an abundance of vein quartz float as well as gossanous pisolite and where prospector activity has located fresh occurrence of gold nuggets.
Bundaroo is situated just north of Magnetic's Wubin project where at least eight target areas have been located with possible direct shipping ore (DSO)-type mineralisation including hematite, goethite and pisolite (refer to ASX Release 11 June 2010).
A cemented pisolite type was also identified in two locations at the Wubin project.
(1) Detritus (adjective detrital) is a geological term used to describe particles of rock derived from pre-existing rock through processes of weathering and erosion.(2) Colluvium or colluvial deposits is the name for loose bodies of sediment that have been deposited or built up at the bottom of a low-grade slope or against a barrier on that slope, transported by gravity.(3) Eluvium or eluvial deposits are those geological deposits and soils that are derived by in situ weathering or weathering plus gravitational movement or accumulation.(4) A pisolite is a sedimentary rock formed from pisoliths.
The deposits consist of unconsolidated ferruginous lateritic gravel (pisolites) and cemented laterite.
Microoolites of size ranging between 0.03 to 0.15mm with pisolites upto 5.5 mm are mostly ferruginous and embedded in the groundmass.
Amouric M, Baronnct A, Nahon D, Didier P (1986) Electron microscopic investigations of iron oxyhydroxides and accompanying phases in lateritic iron-crust pisolites. Clays and Clay Minerals 34, 45-52.
Several other presentations centered on unraveling the geology of specific vineyards and regions: an examination of the Yakima Fold Belt structures in the Columbia Valley, the influence of fragipans and pisolites on one particular vineyard in Washington County, Ore., and so on.