Apr, 2014 - Mar, 2017
Revealing the process of melt generation and hidden reservoir formation in the Hadean Earth
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C) Grant-in-Aid for Scientific Research (C)
- Grant number
- 26400514
- Japan Grant Number (JGN)
- JP26400514
- Grant amount
-
- (Total)
- 4,680,000 Japanese Yen
- (Direct funding)
- 3,600,000 Japanese Yen
- (Indirect funding)
- 1,080,000 Japanese Yen
The present Earth has a higher 142Nd/144Nd ratio than most chondrites. Thus, if the Earth is assumed to have formed from chondrite, a complement low-142Nd/144Nd reservoir (hidden reservoir) is needed. We estimated the age and conditions to form the hidden reservoir based on Sm-Nd partitioning and melting phase relations. Our estimate indicates that the hidden reservoir should have formed within ~30 Myr from the Earth formation and at 7 GPa, 1750°C. We then performed high pressure melting experiments on primitive peridotite to determine the major element composition of a melt that can be the hidden reservoir at this condition, and calculated its density. The results indicate that the melt is iron- and titanium-rich komatiite. The estimated density of the melt is lower than that of the primitive peridotite, suggesting that the melt would have ascended in the mantle to form crust in the Hadean and have been ejected from the Earth by the giant impact.
- Link information
- ID information
-
- Grant number : 26400514
- Japan Grant Number (JGN) : JP26400514
List of results of the research project
Narrowing down
Papers
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Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu, 27(4) 256-265, 2017 Peer-reviewedLead authorCorresponding author
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Progress in Earth and Planetary Science, 3(1) 25, Dec 1, 2016 Peer-reviewed