Oolite or oölite (from Ancient Greek ᾠόν (ōión) ' egg stone ') [1] is a sedimentary rock formed from ooids, spherical grains composed of concentric layers. [2] Strictly, oolites consist of ooids of diameter 0.25–2 millimetres; rocks composed of ooids larger than 2 mm are called pisolites .

Nov 13, 2015 · Oolite, a light gray rock composed of siliceous oolites cemented in compact silica, is formed in the sea. This section illustrates thin sections of the mineral oolite photographed in polarized light, between crossed polarizers, and with a full-wave retardation plate.

Oolite is a sedimentary rock made up of ooids (ooliths) that are cemented together. Most oolites are limestones — ooids are made of calcium carbonate (minerals aragonite or calcite). Ooids are spheroidal grains with a nucleus and mineral cortex accreted around it which increases in sphericity with distance from the nucleus.

An oolite is a sedimentary rock made of ooids (= ooliths), which are approximately spherical, concretionary grains, typically of calcium carbonate, but may be of iron oxides, clays, apatite, etc. Pisoids are between 2-10 mm in diameter, while ooids are <2 mm.

Oolite is a type of shallow-water sediment composed of evenly coated grains that typically form near the palaeo-equator, within around 30° north and south latitude. It serves as a valuable proxy for understanding past palaeoceanographic conditions such as water-energy levels, water depths, salinity, and climate conditions.

Oct 1, 2015 · Global review of 43 oolite-bearing Permian–Triassic boundary (PTB) sections with reliable biostratigraphic controls indicates that ooids occurred mostly in coincidence with the latest Permian extinction (LPE) and its immediate aftermath.

Jan 1, 2013 · Oolite is a sedimentary rock, most often limestone, composed of smoothly laminated, spherical to ellipsoidal coated grains that are cemented together . The grain components of oolite are called ooids (or öoids or ooliths), terms derived from the Greek word

Feb 22, 2021 · We randomly generate orientations and positions for the intersecting plane and measure the dimensions of the resulting ellipses to simulate a 2D surface formed by cutting through an oolite to make a thin section or polished surface.

A bed of bioturbated nodular limestone, composed of minute calcitised kidney-shaped, Rhaxella sponge spicules (visible only microscopically, in thin-section). In the field it appears grey, rough, nodular and is fossiliferous.

Thin section, scanning electron microscopy, X-ray diffraction, porosity and permeability analyses have been performed to delineate the diagenesis and reservoir characteristics of Xujiahe...