grainstone

grainstone

[′grān‚stōn]
(petrology)
A mud-free (micrite-free) limestone.
References in periodicals archive ?
It comprises fine to coarse sandstones, siltstones, argillaceous limestone, nodular limestone and fine to coarse crinoidal grainstone and marl (Fig.
The Grainstone microfacies represent the near shore, high energy, shallow water bar, beaches and shoals environments.
(MFl)-Brachiopod crinoidal grainstone. This facies is bioclastic grainstone and consists of brachiopod shells, bryozoans, ostracods, gastropods, crinoids and mollusks (Fig.
The larger foraminifera microfacies MF 2 sample HST-6/4 (Tables 1 and 2) texturally comprises a compacted bioclastic grainstone bearing flat and partially eroded, deformed, or broken larger foraminifera tests set parallel to each other to delineate lamination as well as tallus fragments of crustose coralline algae.
Leyenda: Figura No 10 y Figura No 11: Grainstone (Grst), Calizas de textura grano soportado no mayor a 2mm con escasa matriz, buena porosidad visible de tipo moldica--vugular, potencial roca reservorio.
Arwa (Kimmeridgian to Tithonian) Fm is composed of argillaceous limestone, deep-water lime mudstone, and locally minor packstone, wackestone, grainstone, and black shale.
Las Sedimentitas de Cruces estan constituidas por sublitoarenitas y litoarenitas con fragmentos de cuarzo, feldespato, micas, opacos, circon, epidota y liticos de rocas sedimentarias y volcanicas; intercaladas con biomicritas con textura wackestone, bioesparitas arenosas con textura grainstone y lodolitas arenosas calcareas.
The texture is grainstone. It has been observed as brown on suggest that deposition occurred in a shallow and high energy environmentin the innershelf environlimestone in the upper part of the Khamir section.
The limestone can be illustrated as mudstone, wackstone, grainstone, white to off white, cream, light gray, light brown, soft to firm, microcrystalline to fine crystalline, dolomitic and anhydritic in parts, and slightly argillaceous.
It is mimetically and/or nonmimetically replaced packstone/ grainstone and its crystals are unimodal, nonplanar-anhedral.
En dicho modelo, la rampa interna estaria constituida principalmente por calizas grainstone ooliticas, peloidales y bioclasticas; la rampa media, por calizas wackestone y packstone con abundantes algas tipo Beresella y esponjas calcareas tipo Chaetetes, y la rampa externa, por calizas wackestone con espiculas de esponjas y calizas micriticas bioconstruidas.
SAMPLE 1: DOLOMITIZED OOID GRAINSTONE WITH ISOPACHOUS DOLOMITE CEMENT