Hi! I have these rock types used in my research (see attached image). May I know which among these I can calculate the weathering indices (CIA, CIW, MWPI, Vogt, WI) on?
Thank you very much!
Dear Mr. Amores,
the indices you mentioned above you can apply to different rocks. But I always recommend to do not only make use of the whole-rock chemistry of them and also take into consideration the mineralogical inventory as well as the geomorphological and pedological part of the case history. It needs some more experience and it is time-consuming but the results obtained are a more stable platform to work on.
I wish you much success
H.G.Dill
Weathering intensity has a major control on the degree to which the primary mineralogy of the bedrock is altered to secondary minerals including clays and oxides. The nature and distribution of the regolith are strongly influenced by parent material and weathering intensity. Given similar parent materials and climatic
conditions, increasing weathering intensity is reflected in a change of
the nature and proportions of these secondary minerals.Weathering intensity can also be determined by measuring changes in the mineralogy or chemistry of the parent material as it weathers. For example, geochemical weathering indices have been used widely to describe weathering profiles and assess the degree of
bedrock weathering (Chittleborough, 1991; Nesbitt and Young, 1982; Parker, 1970; Price and Velbel, 2003). These indices are based on chemical changes, often ratios of stable vs. mobile elements, from sample points through a weathering profile. Geochemical weathering indices are based on site measurements, such as geochemical composition, that cannot be easily extrapolated across the landscape
without an appropriate surrogate...PDF enclosed
The weathering intensity scale (WIS): An alternative approach of the Chemical Index of Alteration (CIA)..The chemical index of alteration (CIA) is a tool to calculate the weathering intensity (Nesbitt and Young, 1982). It has been largely used to reconstitute the past climates on Earth at different epochs and to determine the sediment source rocks from shale and graywacke stratigraphical series. Source :doi: 10.2475/02.2013.03AJS Online February 2013 vol. 313 no. 2 113-143
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