Discovery of Diamonds Formed in the Earth’s Crust

Research Press Release | June 12, 2015

Carbonaceous material found in serpentinite (Fig. 1) from Sicily’s Hyblean Plateau was analyzed primarily by a group at Hokkaido University using a transmission electron microscope and micro Raman scattering spectrometer.
Carbonaceous material found in serpentinite (Fig. 1) from Sicily’s Hyblean Plateau was analyzed primarily by a group at Hokkaido University using a transmission electron microscope and micro Raman scattering spectrometer.



Press Release
Key Points * Nanodiamonds have been discovered in carbonaceous material in serpentinite.

* Nanodiamonds are formed in the earth’s crust at low temperatures and pressures of less than 300 ºC and 1,000 atmospheric pressure (or atm).

* It is expected that nanodiamonds will also be discovered in sedimentary rock and crude oil.

Overview Diamonds found previously have all been formed deep in the earth at high temperatures and pressures. On the other hand, while it was understood that diamonds can be formed experimentally at the low temperatures and pressures associated with the earth’s crust, none had been found in crustal rock.


A joint research team from the Russian Academy of Sciences, Hokkaido University, and the University of Catania has used a variety of methods to analyze carbonaceous material in serpentinite produced by reacting peridotite with water and carbon dioxide at the low temperatures and pressures associated with the earth’s crust. Results show nanodiamonds of a few nm in size.


88-new


Furthermore, it is now understood that nanodiamonds are formed in the earth’s crust at temperatures and pressures of less than 300 ºC and 1,000 atmospheric pressure (or atm), and at depths of less than 5 km. This is the first discovery of diamonds produced naturally on the earth at low temperatures and pressures outside the stability region.

Inquiries

Akira KOUCHI, Professor, Astrophysical Chemistry/ Ice & Planetary Science Group, Institute of Low Temperature Science, Hokkaido University

TEL: +81-11-706-5500

FAX: +81-11-706-7042

E-mail: kouchi@lowtem.hokudai.ac.jp

Japanese

Link

地殻内で形成されたダイヤモンドを発見 
Publications Nanodiamond Finding in the Hyblean Shallow Mantle XenolithsScientific Reports (Nature Publishing Group)(2015.6.1)

LATEST NEWS

University News | December 15, 2017
Hokkaido Summer Institute 2018 courses finalized!
University News | December 13, 2017
Japan-Russia Youth Forum 2017 held at Hokkaido University
University News | December 01, 2017
HU Ambassador wins the 2017 Volvo Environmental Prize
University News | November 13, 2017
Dinner meeting with Indonesian alumni
Student Awards | November 10, 2017
Student Awards: Graduate School of Medicine

ARCHIVES

CONNECT WITH US

  • Facebook
  • Twitter
  • Instagram
  • YouTube
  • LinkedIn

BACK TO TOP