Ooids (/ ˈoʊˌɔɪd /, [1] from Ancient Greek ᾠόν (ōión) 'egg stone') [2] are small (commonly ≤2 mm in diameter), spheroidal, "coated" (layered) sedimentary grains, usually composed of calcium carbonate, but sometimes made up of iron - or phosphate -based minerals.

2024年7月1日 · Ooids are a common constituent of carbonate rock throughout the last 3.2 billion years. The chemical and physical characteristics of ooids record essential details of the carbonate chemistry and hydrodynamic conditions of their depositional environment.

2019年3月1日 · Ooids are spherical or ovoidal carbonate grains (typically <2 mm in diameter) of smooth, well-laminated cortices that accrete around a nucleus, typically a bioclast, peloid, siliciclastic grain or lithoclast (Fig. 1).

2021年2月22日 · We present a method for making 3D reconstructions by serial grinding and imaging, which enables accurate measurement of the morphology of individual ooids within an oolite, as well as the sorting and porosity of a sample. We also provide three case studies that use the morphology of ooids in oolites to extract environmental information.

2018年1月29日 · Here we investigate a rare and beautiful geophysical problem that combines both of these processes; the shape evolution of carbonate particles known as ooids. We hypothesize that mineral...

2020年7月11日 · Ooids are sand grains that are composed of a series of concentric layers of calcium carbonate precipitated around a smaller particle. We hypothesized that the layers in an ooid preserve a record of the episodes of growth and abrasion experienced by that grain because these processes change the shape of the grain in distinct and unique ways.

Ooids 是小的 (< 2毫米)，球状， “涂上了” (分层堆积) 沉淀 五谷，通常组成由 碳酸钙，但有时组成 铁-或 磷酸盐-基于矿物。 通常Ooids形式在 海底通常在浅热带海 (在附近 巴哈马例如，或者在 波斯湾). 在被埋没在另外之下以后 沉积这些ooid五谷可以一起用水泥涂对形式a 水成岩 叫 oolite. Oolites通常包括他们属于的碳酸钙意思 石灰石 岩石家庭。 Pisoids于ooids大于直径的2毫米是相似的，但，经常可观地大，和与pisoids在温泉在Carlsbad (Karlovy变化)在捷克。 ooid形成作为 …

2024年2月7日 · Ooids are coated grains composed of a tangential or radial cortex growing around a nucleus. They are common in carbonate deposits of almost any geological age and provide insights into environmental conditions. However, abiotic …

Ooids are spherical-subspherical grains, consisting of one or more regular concentric lamellae around a nucleus, usually a carbonate particle or quartz grain. Sediment composed of ooids is referred to as an oolite.

2024年3月12日 · Ooids are a common constituent of carbonate rock throughout the last 3.2 billion years. The chemical and physical characteristics of ooids record essential details of the carbonate chemistry and hydrodynamic conditions of their depositional environment.