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Related to detrital: detrital minerals, Detrital sediment
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On the eastern side of the Tempisque, micropaleontologic dating seems to indicate an Eocene age for the detrital sediments forming the substrate of Barra Honda (Rivier 1981), implying a tectonic emplacement of the older limestones over younger detrital sediments.
Dodson MH, Compston W, Williams IS, Wilson JF (1988) A search for ancient detrital zircon in Zimbabwean sediments.
In forest ecosystems, as in most ecosystems, most net primary productivity flows into the detrital pathway (Coleman and Crossley, 1996).
A few resource enhancement experiments have been performed with aquatic and terrestrial detrital food webs (Seastedt et al.
Coarse-grained detrital minerals are rare in the Shengli River oil shale; the absorption of finegrained minerals and/or organic matter may be the main mode of occurrence of Rb, Sr, Sm and Nd.
The plan of this paper is (1) to look at the section from which the detrital zircon sample was taken to establish relations between that sample and provenance characteristics of adjacent conglomerate units, (2) determine the stratigraphic extent to which those characteristics apply, and (3) expand the analysis to the entire Horton and lower Windsor sequence of southern Isle Madame, in order to establish trends and depict changing paleogeographic relations.
For this purpose, and taking into account that the minimum Th/U ratio of normal mudstones where U is assumed to be entirely detrital is 3, the formula introduced by Wignall and Myers (1988) to estimate the detrital and authigenic U fractions in mudstones was used (Eq.
The company has collaborated in its Alexander 09-12-56-27W4 step-out well producing from the Detrital oil zone.
The crystalline phyllosilicates occurring in argillaceous and detrital lutite accumulations of any geological age, including their epizonally metamorphosed equivalents but still recognizable as original sediments, can be divided into six groups (Fig.
The inorganic constituents described [6] are: (i) calcite of foraminifera shells and fine-grained matrix, (ii) authigenic quartz filling the chambers of some foraminifera, composing tests of siliceous algae (supposed), and very limited detrital quartz, (iii) phosphate in pellets, intraclasts, bone, teeth, and coprolites of carbonate fluorapatite, clay minerals thought to be detrital in origin, (iv) pyrite as filling the chambers of shells and voids.
Ankerite (ferroan dolomite) grains and detrital muscovite flakes 2-5 mm long occur throughout the formation; weathering of the former produces a characteristic pale orange weathering rind.