Presentation Information
[U05-06]Hydrogen generation potential of the Philippine Sea oceanic core complexes: a geological synthesis of the Godzilla and Nankaido Megamullions
*Yasuhiko Ohara1,2,3, Shin'ichi Kuramoto3 (1.Hydrographic and Oceanographic Department of Japan, 2.Nagoya Universtiy, 3.Japan Agency for Marine-Earth Science and Technology)
Keywords:
oceanic core complex,Godzilla Megamullion,Nankaido Megamullions,natural hydrogen
Oceanic core complexes (OCCs) formed in slow to ultraslow spreading environments expose deep-seated mantle and lower-crustal rocks on the seafloor. The Godzilla Megamullion, the largest OCC on Earth located in the Parece Vela Basin of the Philippine Sea, provides an exceptional window into the upper mantle beneath a backarc basin. In this contribution, we synthesize current geological and geophysical knowledge of the Godzilla Megamullion and compare it with the Nankaido Megamullions, another major OCC system located in the Shikoku Basin.
The possible utilization of OCCs as natural hydrogen sources has recently gained attention in offshore resource studies. The widespread exposure of mantle peridotites along detachment fault surfaces in these OCCs suggests that they represent promising natural laboratories for assessing subseafloor hydrogen generation potential as serpentinization of mantle peridotite generates hydrogen.
By integrating structural, lithological, and alteration characteristics from previous studies and the related IODP3 proposal for drilling the Godzilla Megamullion, we review the geological factors that may govern hydrogen productivity in OCC environments. This synthesis provides a conceptual basis for evaluating offshore natural hydrogen systems in the Philippine Sea.
We thank Kyoko Okino, Katsuyoshi Michibayashi, Yumiko Harigane, Jonathan E. Snow, Alessio Sanfilippo, and other members of the Godzilla and Nankaido Megamullions research group for their long-term collaborations and insightful discussions, which have greatly contributed to shaping this synthesis.
The possible utilization of OCCs as natural hydrogen sources has recently gained attention in offshore resource studies. The widespread exposure of mantle peridotites along detachment fault surfaces in these OCCs suggests that they represent promising natural laboratories for assessing subseafloor hydrogen generation potential as serpentinization of mantle peridotite generates hydrogen.
By integrating structural, lithological, and alteration characteristics from previous studies and the related IODP3 proposal for drilling the Godzilla Megamullion, we review the geological factors that may govern hydrogen productivity in OCC environments. This synthesis provides a conceptual basis for evaluating offshore natural hydrogen systems in the Philippine Sea.
We thank Kyoko Okino, Katsuyoshi Michibayashi, Yumiko Harigane, Jonathan E. Snow, Alessio Sanfilippo, and other members of the Godzilla and Nankaido Megamullions research group for their long-term collaborations and insightful discussions, which have greatly contributed to shaping this synthesis.