Evidence in the Japan Sea of microdolomite mineralization within gas hydrate microbiomes

Glen T Snyder* (Corresponding Author), Ryo Matsumoto, Yohey Suzuki, Mariko Kouduka, Yoshihiro Kakizaki, Naizhong Zhang, Hitoshi Tomaru, Yuji Sano, Naoto Takahata, Kentaro Tanaka, Stephen A Bowden, Takumi Imajo

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Over the past 15 years, massive gas hydrate deposits have been studied extensively in Joetsu Basin, Japan Sea, where they are associated primarily with active gas chimney structures. Our research documents the discovery of spheroidal microdolomite aggregates found in association with other impurities inside of these massive gas hydrates. The microdolomites are often conjoined and show dark internal cores occasionally hosting saline fluid inclusions. Bacteroidetes sp. are concentrated on the inner rims of microdolomite grains, where they degrade complex petroleum-macromolecules present as an impurity within yellow methane hydrate. These oils show increasing biodegradation with depth which is consistent with the microbial activity of Bacteroidetes. Further investigation of these microdolomites and their contents can potentially yield insight into the dynamics and microbial ecology of other hydrate localities. If microdolomites are indeed found to be ubiquitous in both present and fossil hydrate settings, the materials preserved within may provide valuable insights into an unusual microhabitat which could have once fostered ancient life.

Original languageEnglish
Article number1876
JournalScientific Reports
Volume10
DOIs
Publication statusPublished - 5 Feb 2020

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Keywords

  • carbon cycle
  • marine biology
  • marine chemistry
  • HIGH METHANE FLUX
  • EASTERN MARGIN
  • CARBONATES
  • OXYGEN-ISOTOPE
  • COMMUNITIES
  • MARINE-SEDIMENTS
  • DOLOMITE
  • JOETSU BASIN
  • DIVERSITY
  • ISOTOPE FRACTIONATION

ASJC Scopus subject areas

  • General

Cite this

Snyder, G. T., Matsumoto, R., Suzuki, Y., Kouduka, M., Kakizaki, Y., Zhang, N., ... Imajo, T. (2020). Evidence in the Japan Sea of microdolomite mineralization within gas hydrate microbiomes. Scientific Reports, 10, [1876]. https://doi.org/10.1038/s41598-020-58723-y