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  • 2020-2024  (1)
  • 2015-2019  (1)
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  • 1
    Publication Date: 2024-03-01
    Description: Hadal trenches are unique geological and ecological systems located along subduction zones. Earthquake-triggered turbidites act as efficient transport pathways of organic carbon (OC), yet remineralization and transformation of OC in these systems are not comprehensively understood. Here we measure concentrations and stable- and radiocarbon isotope signatures of dissolved organic and inorganic carbon (DOC, DIC) in the subsurface sediment interstitial water along the Japan Trench axis collected during the IODP Expedition 386. We find accumulation and aging of DOC and DIC in the subsurface sediments, which we interpret as enhanced production of labile dissolved carbon owing to earthquake-triggered turbidites, which supports intensive microbial methanogenesis in the trench sediments. The residual dissolved carbon accumulates in deep subsurface sediments and may continue to fuel the deep biosphere. Tectonic events can therefore enhance carbon accumulation and stimulate carbon transformation in plate convergent trench systems, which may accelerate carbon export into the subduction zones.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    Format: other
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  • 2
    Publication Date: 2021-05-19
    Description: The Kyushu-Palau Ridge has the inflection point at about 24゜N. In the northern part of the ridge, north of 24゜N, it tends NNW-SSE, whereas it runs along a NNE-SSW direction further south, the southern part. Two multi-channel seismic reflection profiles across the Kyushu-Palau Ridge at both part were examined. Both profiles document the rift architecture of the Paleo Kyushu-Palau Ridge. The submersible Shinlwi 6500 dive was performed to observe the acoustic basement exposed in the Sui-shin Depression. Submersible observation revealed that the acoustic basement is composed of consolidated hemipelagic sedimentary rock The Kyushu-Palau Ridge has the inflection point at about 24゜N. In the northern part.of the ridge, north of 24゜N, it tends NNW-SSE, whereas it runs along a NNE-SSW direction further south, the southern part. Two multi-channel seismic reflection profiles across the Kyushu-Palau Ridge at both part were examined. Both profiles document the rift architecture of the Paleo Kyushu-Palau Ridge. The submersible Shinlwi 6500 dive was performed to observe the acoustic basement exposed in the Sui-shin Depression. Submersible observation revealed that the acoustic basement is composed of consolidated hemipelagic sedimentary rocks.
    Description: Published
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp. 85-93
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