Ree Chemistry of Arid Zone Calcrete Profiles-A Case Study From The Thar Desert, India

Authors : D Ramakrishnan And Kc TIWARI

Pages : 97-104

View : 21 | Download : 11

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Calcrete is the widely prevalent duricrust associated with the weathering profiles of the Thar desert. The studies on REE behaviour within different weathering horizons of calcrete profiles, have revealed distinct pattern of enrichment and depletion. Fractionation of REE as evidenced through La/Lu, La/Sm, Nd/Dy ratios and removal index, are attributed to pedogenic processes such as breakdown of micas, pyroxenes, amphiboles, feldspars; removal of elements as soluble complexes; selective fixation of elements in neoformed clay minerals like montmorillonite, illite and chlorite. Sesquioxides rich Bir horizon shows enrichment of REE. REE depletion in Palaeo- Bt horizons could be due to their removal in solution as organic complexes.
Keywords : Turkish J Earth Sci, 7, 1998, 97 104 Turkish J Earth Sci, vol 7, iss 2