Manuscript Title:

RARE EARTH ELEMENT GEOCHEMISTRY OF MESOARCHEAN QUARTZITES OF GHATTIHOSAHALLI SCHIST BELT, WESTERN DHARWAR CRATON, KARNATAKA, INDIA: IMPLICATIONS ON PROVENANCE, PALEO-WEATHERING AND TECTONIC SETTING

Author:

M. VINAYA, GOVINDARAJU, G. S. SOMESHA

DOI Number:

DOI:10.5281/zenodo.10489952

Published : 2024-01-10

About the author(s)

1. M. VINAYA - Research Scholar, Department of PG Studies and Research in Applied Geology, Kuvempu University, Jnana Sahyadri, Shankaraghatta, Karnataka, India.
2. GOVINDARAJU - Professor, Department of PG Studies and Research in Applied Geology, Kuvempu University, Jnana Sahyadri, Shanakaraghatta, Karnataka, India.
3. G. S. SOMESHA - Lecturer, Department of PG Studies and Research in Applied Geology, Kuvempu University, Jnana Sahyadri, Shanakaraghatta, Karnataka, India.

Full Text : PDF

Abstract

The present study explores and characterizes the quartzites from the Ghattihosahalli Schist Belt for major and trace elements, including REEs, in order to analyze their paleo-weathering and provenance characteristics, as well as possible tectonic settings. A petrography and geochemical analysis of the quartzite was conducted in order to determine the extent of paleo-weathering and its provenance. Geochemical data plots like log (SiO2/Al2O3) vs. log (Fe2O3/K2O) & log (SiO2/Al2O3) vs. log (Na2O/K2O) categorize the quartzites as sub-arkose to sub-litharenite and fuchsite quartzites as arkose to litharenite. Na2O vs. K2O plot diagram shows quartz abundance in studied samples. Quartzite exhibits moderate to intense chemical weathering based on CIW, CIA, PIA and A-CN-K plots, while fuchsite quartzite exhibits semi-arid to semi-humid conditions. Chondrite normalized REE are fractionated in fuchsite quartzites and quartzites with low HREE. Discriminant functions suggest that studied samples have been formed in quartzose sedimentary fields. Plotting TiO2 vs. Ni indicates felsic provenance for the samples. Al2O3/SiO2 vs. Fe2O3+MgO and SiO2 vs. K2O/Na2O plots indicate quartzites occupied a passive margin tectonic setting. The major and trace element ratios, patterns of REE normalized on chondrites and diagrams of normalized multi-elements depicts that the studied quartzites are predominantly felsic with some mafic contribution.
 


Keywords

Geochemistry, Provenance, Paleo-Weathering, Quartzites, REE, Tectonic Setting.