Earth, core, mantle

Researchers discover previously unknown mineralogy of the deep Earth

In 2010, two of the study's authors—David Shuster of UC Berkeley (left) and Yosemite Park geologist Greg Stock (right)—collected rock samples from the rim of Yosemite Valley, where the granite has eroded only slowly over the last 50 million years. In the distance is the upper Merced River valley. Former UC Berkeley graduate student Johnny Webb is at center. Credit: Kurt Cuffey, UC Berkeley

How old is California’s Yosemite Valley?

Using Mössbauer spectroscopy, Osaka Metropolitan University scientists investigate the iron ion status of pyroxenes, a major group of rock-forming silicate minerals. Their study revealed that in pyroxene crystals consisting of roughly 50% calcium, the tensor that determines the ratios of iron ions at the Mössbauer spectral peaks is independent of the iron content but dependent on the calcium content. Credit: Shinoda, OMU

Calcium content determines the peak intensity ratio due to iron ions...

Mount Edgecumbe rises in the foreground with Crater Ridge behind and to the north on May 19, 2022. Photo by Max Kaufman/Alaska Volcano Observatory

Research reveals magma activity beneath Mount Edgecumbe

A depiction of an asteroid heading toward Earth, with the moon in the background. (Image credit: Juan Gartner via Getty Images)

The largest meteorite impacts on Earth

Calcium oxalate crystals - In living plants, calcium oxalate crystals can take on bizarre shapes (from left: hornbeam, button mangrove, Australian nettle) Credit: © Mahdieh Malekhosseini / University of Bonn

New field of research: Crystal traces in fossil leaves

Scleromochlus taylori. Credit: Gabriel Ugueto

Triassic specimen found to be early relative of pterosaurs a century...

Asteroid impact earth

Dinosaur-killing asteroid triggered global tsunami that scoured seafloor thousands of miles...

The skull of Ichthyosaurs Hauffiopteryx typicus from the Strawberry Bank Lagerstätt, one of the specimens that were the subject of this study Credit: Bath Royal Literary and Scientific Institution Collections

Jurassic ichthyosaurs divided food resources to co-exist, researchers find

The diamond from Botswana revealed to the scientists that considerable amounts of water are stored in the rock at a depth of more than 600 kilometres. Photo: Tingting Gu, Gemological Institute of America, New York, NY, USA

An ocean inside Earth? Water hundreds of kilometers down

1...464748...686Page 47 of 686