“caliche”的概念、定义、翻译、参考文献-科学参考

caliche

Chemistry

A mixture of salts found in deposits between gravel beds in the Atacama and Tarapaca regions of Chile. They vary from 4 m to 15 cm thick and were formed by periodic leaching of soluble salts during wet geological epochs, followed by drying out of inland seas in dry periods. They are economically important as a source of nitrates. A typical composition is NaNO₃ 17.6%, NaCl 16.1%, Na₂SO₄ 6.5%, CaSO₄ 5.5%, MgSO₄ 3.0%, KNO₃ 1.3%, Na₂B₄O₇ 0.94%, KClO₃ 0.23%, NaIO₃ 0.11%, sand and gravel to 100%.

Geology and Earth Sciences

Carbonate horizon (the K horizon) formed in a soil in a semi-arid region, under conditions of sparse rainfall (20–60 mm/yr) and a mean annual temperature of about 18 °C, normally by the precipitation of calcium carbonate carried in solution. The soil profile develops over several thousand years, initially in the form of nodules (glaebules), more mature caliches taking a massive, laminar form. It may become cemented and indurated on exposure, when it gives rise to a tabular landscape. See also calcic; duricrust; duripan; petrocalcic.

单词	caliche
释义	caliche Chemistry A mixture of salts found in deposits between gravel beds in the Atacama and Tarapaca regions of Chile. They vary from 4 m to 15 cm thick and were formed by periodic leaching of soluble salts during wet geological epochs, followed by drying out of inland seas in dry periods. They are economically important as a source of nitrates. A typical composition is NaNO₃ 17.6%, NaCl 16.1%, Na₂SO₄ 6.5%, CaSO₄ 5.5%, MgSO₄ 3.0%, KNO₃ 1.3%, Na₂B₄O₇ 0.94%, KClO₃ 0.23%, NaIO₃ 0.11%, sand and gravel to 100%. Geology and Earth Sciences Carbonate horizon (the K horizon) formed in a soil in a semi-arid region, under conditions of sparse rainfall (20–60 mm/yr) and a mean annual temperature of about 18 °C, normally by the precipitation of calcium carbonate carried in solution. The soil profile develops over several thousand years, initially in the form of nodules (glaebules), more mature caliches taking a massive, laminar form. It may become cemented and indurated on exposure, when it gives rise to a tabular landscape. See also calcic; duricrust; duripan; petrocalcic.
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