Early Martian tectonic evolution: A study through geological and geophysical perspectives

• Project/Area Number: 18F18312
• Research Category: Grant-in-Aid for JSPS Fellows
• Allocation Type: Single-year Grants
• Section: 外国
• Review Section: Basic Section 17040:Solid earth sciences-related
• Research Institution: The University of Tokyo
• Principal Investigator: 河合 研志 東京大学, 大学院理学系研究科(理学部)021, 准教授 (20432007)
• Co-Investigator(Kenkyū-buntansha): RUJ TRISHIT 東京大学, 大学院理学系研究科(理学部), 外国人特別研究員
• Project Period (FY): 2018-11-09 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥1,500,000 (Direct Cost: ¥1,500,000); Fiscal Year 2019: ¥700,000 (Direct Cost: ¥700,000); Fiscal Year 2018: ¥800,000 (Direct Cost: ¥800,000)
• Keywords: Impact behavior / Mars tectonics / Heat loss / Wrinkle ridge / Hesperian Compression / Global Compression / Buffer Crater Count / Age estimation / Mars / Noachian / Tectonics / Thermal history / Mantle Convection / Mapping

Outline of Annual Research Achievements

Our research is themed to understand Martian heat loss mechanism.
We mimicked Hellas size giant impact, using iSALE-3D shock physics code and executed impact simulations and used the results to a time-dependent thermal convection of a fluid with an infinite Prandtl number and a temperature-dependent viscosity under the Boussinesq approximation in a cylinder.
Observed results indicate that the generation of thermal gradient, resembling plume and are significant in terms of the morphological observations, in and around the Hellas region.
We also estimated the age of the wrinkle ridges of Mars on a global scale and we observed a global compression in Hesperian time (Ruj and Kawai, submitted to Icarus, under review).
Research on Moon
In order to understand the mantle evolution of the Moon, we are working on the landing site of the Chang’E 4 landing site (Von Karman crater). We have prepared a geological map (taking morphology and mineralogy into count) of the landing site region, and now we are working on the timing and type of volcanic material found in and around the landing site.

Research Progress Status

令和元年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和元年度が最終年度であるため、記入しない。

Research Products

• [Int'l Joint Research] Universita d’Annunzio(イタリア)
• [Int'l Joint Research] Sun Yat-sen University(中国)
• [Int'l Joint Research] Indian Institute of Technology Kanpur(インド)
• [Int'l Joint Research] UNIVERSITA DEGLI STUDI “G. dANNUNZIO”(イタリア)
• [Int'l Joint Research] Wilhelms-Universitat(ドイツ)
• [Journal Article] The Goshogake mud volcano field, Tohoku, northern Japan: An acidic, high-temperature system related to magmatic volcanism (2019)
  • Author(s): Komatsu, G., R. Ishimaru, N. Miyake, K. Kawai, M. Kobayashi, H. Sakuma, and T. Matsui
  • Journal Title: Geomorphology Volume: 329 Pages: 32-45
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Timings of early crustal activity in southern highlands of Mars: Periods of crustal stretching and shortening (2019)
  • Author(s): Ruj, T., Komatsu, G., Pasckert, J.H., and Dohm, J.M.
  • Journal Title: Geoscience Frontiers Volume: 10 Pages: 1029-1037
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] Possible Earth-like tectonic scenario on Mars; a mineralogical and geochemical perspective (2019)
  • Author(s): Trishit Ruj, Gene W Schimdt, Goro Komatsu, Kenji Kawai
  • Organizer: JpGU2019
• [Presentation] Sedimentary Records Of Ancient Mud Volcanism: How Do We Identify Mud Volcanoes In The Strattgraphy Of Mars? (2019)
  • Author(s): G. Komatsu, R. Ishimaru, K. Kawai, N. Miyake, M. Kobayashi, T. Matsui
  • Organizer: 50th Lunar and Planetary Science Conference in The Woodlands
  • Int'l Joint Research
• [Presentation] Early Martian crustal dynamics; Investigation from oldest highland terrain (2019)
  • Author(s): Ruj, T.
  • Organizer: Science and Technology of Nano-Polycrystalline Diamond, STNPD-2019
  • Int'l Joint Research