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Tufa
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Tufa : ウィキペディア英語版
Tufa


Tufa is a variety of limestone, formed by the precipitation of carbonate minerals from ambient temperature water bodies. Geothermally heated hot springs sometimes produce similar (but less porous) carbonate deposits known as travertine. Tufa is sometimes referred to as (meteogene) travertine; care must be taken when searching through literature to prevent confusion with hot spring (thermogene) travertine. Calcareous tufa should not be confused with tuff, a porous volcanic rock with parallel etymological origins that is sometimes called "tufa".
==Classification and features==
Modern and fossil tufa deposits abound with wetland plants; as such many tufa deposits are characterised by their large macrobiological component and are highly porous. Tufa forms either in fluvial channels or in lacustrine settings. Ford and Pedley (1996) provide a review of tufa systems worldwide.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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