Uplift rate of Kitadaito Jima Island on the lithospheric forebulge of the Philippine Sea Plate

Yasufumi Iryu, Hideko Takayanagi, Tsuyoshi Ishikawa, Akimasa Ishigaki, Takuji Asanuma, Rin Teruya, David A. Budd

Research output: Contribution to journalArticlepeer-review


Estimates of uplift rates for lithospheric forebulges are needed to understand exact plate motions at plate convergence zones and to delineate the fate of coral reefs atop the forebulges. A carbonate island on a lithospheric forebulge can provide excellent materials for estimating uplift rate because carbonate sediments can be dated and their paleo-water depth determined. We estimated the uplift rate of Kitadaito Jima Island, a carbonate island on the lithospheric forebulge of the Philippine Sea Plate that is subducting beneath the Eurasian Plate. Marine skeletal sands containing pebble-sized bioclasts and filling the concavity of an intertidal erosional notch at an elevation of ~ 71 m were found near the top of this island. Strontium isotope ages ranging from 1.78 to 2.01 Ma with an average of 1.89 Ma (standard deviation = 0.07 Ma) were obtained from these deposits. As global sea level at 1.89 Ma was ~ 21 m lower than the present, the mean uplift rate was estimated at ~ 49 m/million years (Myr) with a compounded uncertainty of ± 2.6 m/Myr. This rate is comparable to, or up to ~ 140 m/Myr less than, rates reported from other Indo-Pacific carbonate islands in similar tectonic settings. This study illustrates how contemporary Sr isotope age models and careful considerations of limestone sample depositional depths can yield more accurate and precise uplift rates of modern forearc bulges than possible in many older studies. [Figure not available: see fulltext.]

Original languageEnglish
Article number4
JournalProgress in Earth and Planetary Science
Issue number1
Publication statusPublished - 2023 Dec


  • Kitadaito Jima
  • Lithospheric forebulge
  • Philippine Sea Plate
  • Sr isotope stratigraphy
  • Uplift rate

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)


Dive into the research topics of 'Uplift rate of Kitadaito Jima Island on the lithospheric forebulge of the Philippine Sea Plate'. Together they form a unique fingerprint.

Cite this