• Geochemistry of surface sediments in parts of Bandipora–Ganderbal areas, Kashmir valley, western Himalaya: Implications for provenance and weathering

• # Fulltext

https://www.ias.ac.in/article/fulltext/jess/128/08/0223

• # Keywords

Stream sediment; slope wash; provenance; chemical weathering; Kashmir; Himalaya

• # Abstract

Sediment geochemistry is an important tool to understand the sediment provenance and weathering. The present study describes the geochemical distribution, the provenance and the degree of weathering in surface sediments in parts of Bandipora–Ganderbal areas, Kashmir valley, western Himalaya. Following the standard operating procedure of the Geological Survey of India, high-density sediment sampling over an area of $\rm{800 km}^{2}$ of toposheet Nos. 43J/11 and 43J/12 (part) was carried during the Field Season Programme of 2014–2015. A total of 200 stream and slope wash sediment samples collected on a $2 \times 2$ grid pattern, covering an area of $\rm{800 km}^{2}$ and 10 numbers of duplicate samples were used in this study. An analysis of major and trace element concentrations of the sediment samples revealed significant changes corresponding to different geological formations of the area. The correlation matrix of $\rm{SiO_{2}, Al_{2}O_{3}, TiO_{2}, Fe_{2}O_{3}, MnO, K_{2}O, Th}$ and $\rm{Y}$ showed a positive correlation with each other and negative correlation with $\rm{CaO, MgO}$ and $\rm{Sr}$, thereby indicating two dominant geological provenances of the sediments. Two dominant geochemical patterns revealed provenances from basaltic and carbonate rock formations in the area. Furthermore, an analysis of geochemical weathering indices (chemical index of alteration and chemical index of weathering) revealed a poor (27) to moderate (78) degree of weathering in this area. This observation is further substantiated by the immaturity of the soil sediments in the area.

• # Author Affiliations

1. State Unit: Karnataka and Goa, Southern Region, Geological Survey of India, Bengaluru 560 111, India.
2. State Unit: Jammu and Kashmir, Northern Region, Geological Survey of India, Srinagar 190 008, India.

• # Journal of Earth System Science

Current Issue
Volume 128 | Issue 8
December 2019

• # Editorial Note on Continuous Article Publication

Posted on July 25, 2019