University of Kerala researchers identify Martian analogue sites

Researchers from the University of Kerala have identified terrestrial analogue sites in Tamil Nadu and Chile’s Atacama Desert that share key geological, chemical, and physical similarities with Mars, providing new tools to study ancient water activity and potential habitability on the Red Planet.

Melanterite Discovery in Neyveli and Gypsum in Tiruchirappalli

The research team, led by Sajin Kumar K.S. of the Department of Geology, identified melanterite in Neyveli, Tamil Nadu, alongside gypsum in the Tiruchirappalli Badlands and Chile’s Atacama Desert. Both minerals are hydrous sulphates that record historical water-rock interactions. While gypsum preserves evidence of past aqueous environments, melanterite indicates short-lived wet, acidic, and oxidizing conditions.

The Ministry of Science and Technology released details of the discovery on October 16, pointing out that these minerals help establish the sites as Martian analogues. The Tiruchirappalli Badlands serve as a semi-arid geological and paleoclimatic terrain matching these extraterrestrial conditions.

Laser Raman Spectrometer Analysis of Martian Analogues

Identifying terrestrial analogue sites has become essential because orbital data alone cannot fully characterize Martian minerals. High-precision analytical tools are required to confirm spectral fingerprints. The Kerala University team utilized a laser Raman spectrometer supported by the Department of Science and Technology’s Fund for Improvement of S&T Infrastructure in Universities and Higher Educational Institutions (DST-FIST) program.

Evolving planetary science relies on such instrumentation to detect distinct spectral signatures. While a spacecraft orbiting Mars can measure reflected light, spectral features alone do not always reveal how a mineral formed. Geological comparisons with Earth-based samples help researchers narrow down those formation processes.

Publication in the Journal of Geophysical Research: Planets

The findings have been documented in two research papers published in the Journal of Geophysical Research: Planets. These studies aim to improve human understanding of past habitable environments on Mars and other planetary bodies.

Identifying minerals capable of recording water activity and preserving biosignatures helps guide future planetary missions toward promising locations in the search for life beyond Earth. The research team is now focusing on rare analogue sites in extreme conditions across the globe to study primitive life for astrobiological research.

Frequently Asked Questions About the Mars Analogue Sites

What do melanterite and gypsum indicate about Mars?

Melanterite indicates short-lived wet, acidic, and oxidizing conditions through sulphide oxidation, while gypsum preserves evidence of past aqueous environments and can hold potential biosignatures within its mineral structure.

Why are Earth-based analogue sites necessary for Mars exploration?

Orbital data alone cannot fully characterize Martian minerals or explain how they formed. Studying matching geological sites on Earth provides physical context for interpreting data gathered by planetary missions.

Where were the specific mineral samples located during the study?

Researchers found melanterite in Neyveli, Tamil Nadu, and discovered gypsum in both the Tiruchirappalli Badlands of Tamil Nadu and the Atacama Desert in Chile.