Tetsumaru Itaya

TL;DR: A new mass spectrometer and associated analytical systems, called HIRU, was designed and constructed for the argon isotope analysis of minerals from young volcanic rocks as well as metamorphics and granitoids as mentioned in this paper.

TL;DR: In this article, the angular velocity of southwest Japan about a rotation pole at 129°E, 34°N reached 20° Myr−1 at about 15 Ma, whereas a northerly declination is observed in formations younger than 14.2 ± 0.6 Ma.

TL;DR: In this article, the Lepanto epithermal Cu-Au deposit overlays the Far Southeast porphyry copper-alunite mine, and the ages of alunite from Lepanto have the same range as those of hydrothermal biotite and illite from the FSE mine.

TL;DR: In this article, the Sanbagawa schists in central Shikoku, Japan have been studied using the K-Ar method and the results show that the ages of the schists are consistently older with increasing metamorphic grade.

TL;DR: A new genus of great ape recently discovered from the early Late Miocene of Nakali, Kenya, called N. nakayamai could be close to the last common ancestor of the extant African apes and humans, and the associated primate fauna shows that hominoids and other non-cercopithecoid catarrhines retained higher diversity into the early late Miocene in East Africa than previously recognized.