Calcretes in semi-arid alluvial systems: formative pathways and sinks

Khadkikar, A. S. ; Merh, S. S. ; Malik, J. N. ; Chamyal, L. S. (1998) Calcretes in semi-arid alluvial systems: formative pathways and sinks Sedimentary Geology, 116 (3-4). pp. 251-260. ISSN 0037-0738

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Late Quaternary deposits in Gujarat, western India show an abundant development of calcretes. Three major sinks of carbonate in the alluvial deposits are recognized: (1) groundwater calcretes, (2) pedogenic calcretes, and (3) calcrete conglomerates. Groundwater calcretes originate from carbonate-saturated waters travelling preferentially along stratification planes. Pedogenic calcretes form through soil-forming processes typically in extra-channel areas. Calcrete conglomerates occur as ribbons, sheets and lenses due to the reworking of both pedogenic as well as groundwater calcretes. As a result a pathway of calcretization develops that has the route: groundwater calcrete to pedogenic calcrete to calcrete-conglomerate. The formation of pedogenic calcretes over sediments containing groundwater calcretes demonstrates that (1) apart from aeolian dust, river waters are also a major source of carbonate, and (2) pedogenic carbonates may attain large sizes at accelerated rates due to the presence of pre-existing groundwater calcretes. Consequently, the maturity of a soil may be overestimated if determined by following established morphogenetic sequences.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Calcrete; Palaeosol; Quaternary; India
ID Code:20292
Deposited On:20 Nov 2010 14:43
Last Modified:06 Jun 2011 11:12

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