Year: 1967
Type: article
Abstract: The diffraction effects expectable from CaMg car- bonates having a variety of abnormal sequences of basal cation population have been calculated by programming the University of Illinois digital computer ILLIAC I for the most general of the Hendricks -Teller equations.Cases involving two and three kinds of multiple layers (packets) with correlation extending to the immediately preceding packet (s = range of correlation = 1) aretreatedas Markov-1 proces- ses.The random packet succession (s=0) is a particular solution of the (s=l) case.In a second paper, to be pub- lished later, the two-packet (s=2) case is formulated in terms of a two-packet Markov-2 model, which is then trans- formed into a four-packet Markov-1 model but not solved.The two-packet (s=l) model reproduces the basal diffraction features observed for synthetic protodolomite powders formed near room temperature.Three-packet (s= 1) models, used as a device for introducing more complex correlations, are required for categorizing the replacive dolomite rhombohedra found in sedimentary limestones.The unambiguous evidence for CaMg carbonate mixed layering available thus far is contained in a few zero-level a-axis Weissenberg diagrams .In the best defined example, the nonideality of the basal cation plane succession apparently involves the distribution of pure Mg layers and Casubstituted Mg layers, rather than the insertion of extra Ca layers.' -H in m m .-1.-1 in m ^1 in en <f in en 0^n 00 Csl CJN r^-Ct vO vf en 1-^o eJ^en en <
Language: English
Subfield: Biomaterials
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2275361505