Department of
Earth and Climate Science

Gyana obtained his PhD in Isotope geochemistry in 2011 from Physical Research Laboratory, Ahmedabad. He was a Post-Doctoral Fellow at Colorado State University, USA and worked at the National Institute of Technology, Rourkela before joining IISER Pune in December 2014.

Research

Low-temperature isotope geochemistry

Gyana leads the GRASP (Geochemical Research for Aquatic and Sedimentary Processes) lab at IISER Pune. The group mainly aims to quantify low-temperature aquatic processes, such as (i) Chemical weathering and climate interaction in the Himalayan river basins, (ii) coastal cycling of trace elements and their isotopes, and (iii) changes in past ocean redox state using shale chemistry and chronology. These studies rely on trace elemental and isotopic analyses of water, sediment and shale samples.

Some of the group’s ongoing research themes include:
(i) Sulfide and organic oxidation in the Indus and Brahmaputra river basins.
(ii) Provenance and Climatic changes during the Holocene.
(iii) Terrestrial and Oceanic changes in response to the Paleocene-Eocene Thermal maxima.
(iv) Sulfur isotopic cycling in coastal lagoon and Arctic fjords.

Selected Publications

Gyana Ranjan Tripathy (2025). Analytical Isotope Geochemistry: Techniques and Data interpretation. (Series: Advances in Isotope Geochemistry), 289 pp., Springer Publications. DOI: 10.1007/978-3-031-88388-0.

Achyuth Venugopal, Gyana Ranjan Tripathy, Vineet Goswami, Tavheed Khan, and Lukáš Ackerman (2025). Unravelling the extent of ocean euxinia during the late Paleoproterozoic: Constraints from Re-Os and Mo isotopes. Geochimica et Cosmochimica Acta, 407, 158-173. DOI: 10.1016/j.gca.2025.09.013.

Rakesh Kumar Rout and Gyana Ranjan Tripathy (2024). Net effect of chemical erosion in a tropical basin on carbon cycle: Constraints from elemental and sulfur isotopic composition of the Mahanadi river water. Chemical Geology, 644, 121859, DOI: doi.org/10.1016/j.chemgeo.2023.121859.

Mohd Danish, Gyana Ranjan Tripathy, Sirsha Mitra, Rakesh Kumar Rout$, and Shubhangi Raskar (2021). Non-conservative removal of dissolved rhenium from a coastal lagoon: Clay adsorption versus biological uptake. Chemical Geology, 580, 120378. DOI: doi.org/10.1016/j.chemgeo.2021.120378.

Anupam Samanta, Gyana Ranjan Tripathy, Ritima Das (2019). Temporal variations in water chemistry of the (lower) Brahmaputra river: implications to seasonality in mineral weathering. Geochemistry Geophysics Geosystems, 20, 2769-2785.