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Statistical Evaluation Of Classification Diagrams For Altered Igneous Rocks, Surendra P. Verma, Rodolfo Rodriguez Rios, Rosalinda González-Ramírez
Statistical Evaluation Of Classification Diagrams For Altered Igneous Rocks, Surendra P. Verma, Rodolfo Rodriguez Rios, Rosalinda González-Ramírez
Turkish Journal of Earth Sciences
The International Union of Geological Sciences (IUGS) has proposed recommendations for the classification of relatively fresh volcanic rocks, but with no specific instructions for altered volcanic rocks, other than discouraging the use of the total alkalis versus silica diagram. The Nb/Y-Zr/TiO2 diagram has been in use for the classification of altered rocks now for over 30 years. Recently (during 2007) another diagram (Co-Th) has been proposed to replace this old diagram, particularly for altered arc rocks. Using an extensive database of all kinds of relatively fresh rocks from four tectonic settings (island arc, continental rift, ocean island, and mid-ocean ridge), …