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Deutsche Maar {n} [geol.] / Maare {pl} Synonyme

geol  
maar  

Englische maar; volcanic lake Synonyme

maar Definition

maar Bedeutung

maar a flat-bottomed volcanic crater that was formed by an explosion, often filled with water
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A maar is a broad, low-relief volcanic crater caused by a phreatomagmatic eruption . A maar characteristically fills with water to form a relatively shallow crater lake which may also be called a maar. The name comes from the local Moselle Franconian dialect of Daun in the Rhineland-Palatinate, Germany, where it derives from Latin mare . Maars are shallow, flat-floored craters that scientists interpret as having formed above diatremes as a result of a violent expansion of magmatic gas or steam; deep erosion of a maar presumably would expose a diatreme. Maars range in size from 60 to 8,000 m across and from 10 to 200 m deep; most maars commonly fill with water to form natural lakes. Most maars have low rims composed of a mixture of loose fragments of volcanic rocks and rocks torn from the walls of the diatreme.