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JITTU MATHAI
Articles written in Journal of Earth System Science
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Volume 130 All articles Published: 15 May 2021 Article ID 0094 Research Article
A MAZUMDAR P DEWANGAN PEKETI A FIROZ BADESAAB MOHD SADIQUE KALYANI SIVAN JITTU MATHAI ANKITA GHOSH ZATALE A S P K PILLUTLA UMA C C K MISHRA WALSH FERNANDES ASTHA TYAGI TANOJIT PAUL
Here, we report for the first time, the genus
Lamellibrachia tubeworm and associated chemosynthetic ecosystem from a cold-seep site in the Indian Ocean. The discovery of cold-seep was made off the Cauvery–Mannar Basin onboardORV Sindhu Sadhana (SSD-070; 13th to 22nd February 2020). The chemosymbiont bearing polychaete worm is also associated with squat lobsters (Munidposis sp.) and Gastropoda belonging to the family Buccinidae. Relict shells of chemosyntheticCalyptogena clams are ubiquitous at the seep sites. TheLamellibrachia tubes were found to be firmly anchored into the authigenic carbonate crusts. The authigenic carbonate crusts (chemoherm) are packed with largeCalyptogena shells (whole shell and fragments). Very high concentrations (3800–12900 $\mu$M) of hydrogen sulfide (H$_{2}$ S) in the interstitial waters (40 cmbsf) is responsible for the sustenance of chemosymbiont bearing tubeworms. The posterior end of the tube penetrates downwards into the H$_{2}$ S-rich zone. The high concentration of H$_{2}$ S at ${\sim}$ 40 cmbsf is attributed to sulfate reduction via anaerobic oxidation of methane (AOM) pathway. Methane hydrate was observed within the faults/fractures in the sediments. The presence of ethane and propane along with methane in the headspace gases and $\delta^{13}$C$_{ CH4}$ values (–28.4 to –79.5per thousand VPDB) suggest a contribution of deep-seated thermogenic methane.
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Journal of Earth System Science
Volume 132, 2023
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