I am seeking naturally occurring soils, firstly within Australia, but also world-wide where the ratio of Calcium to Magnesium is less than 0.1 [Ca/Mg
Dear Dr:
Here you are some data from volcanic soils from El Hierro Island (Canary Islands), (not yet published). They are far form 0.1 ratio but perhaps you can use them to compare from other soils of the world. Hope it helps.
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You can try to ask in CIAT, Cali, Colombia. There are some soils with certain excess of exchangeable Mg comparing with Ca (although not 10Mg vs 1Ca) in Cauca valley. I found it in "Conservacion de suelos y aguas en la zona andina", in Spanish. They treat about these soils in attached file (Chapter 6, starting from page 55/75 of attached file or 84 according to information of the page. I downloaded it in 2009 from http://www.ciat.cgiar.org/es/descargar/inicio.htm, but it is not still available there). The authors of the chapter 6 are from UNAL, sede Palmira Universidad Nacional de Colombia), but the paper was published by CIAT.
May be they have soils with still more Mg?
Regards,
Michal
While working with Indian Vertisols we came across some Typic Haplusterts, Calcic Haplusterts and Sodic Calciusterts wherein Ca/Mg ratio was < 1.0 ranging from 0.3-0.8 in the subsoil only. All these soils are obviously moderately to highly calcareous. We also observed low Ca/Mg ratio in Typic Haplusterts that contain palygorskite mineral.You may refer to the following 2 publications.
Hi John
Exch Ca:Mg < 0.1 are quite common in ultramafic soils.
We found many in Palwan, Philppines:
Baillie, I. C., Inciong, N. B. & Evangelista, P. P. 2001. Soils and land use on lithologically diverse ophiolitic alluvia on the coastal plain of Palawan, Philippines. Singapore Journal of Tropical Geography. 22 1 – 14.
Baillie, I. C., Evangelista, P. P. & Inciong, N. B. 2000. Differentiation of upland soils on the Palawan ophiolitic complex, Philippines. Catena 39 283 – 299.
I suggest that you conatct Nora Inciong and see if she retained any of the samples.
Alternativly there may be soil surveys on ultramafics in PNG which may have smaples available.
Good luck
Ian
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