Volcanoes seen as likely trigger for global glaciation
A 10-year string of steady volcanic eruptions may have been the trigger for a massive global cooling event that left much of the Earth encased in glaciers and ice sheets about 771 million years ago.
The eruptions could have spewed so much sulphur dioxide into the atmosphere that the planet’s climate reached a tipping point, resulting in what scientists call ‘snowball Earth,” according to a new study published this month in Geophysical Research Letters. Understanding the natural variability of climate is important to understanding current climate change driven by emission of greenhouse gases. Continue reading “What caused ‘snowball Earth?’”→
Researchers find vast chasm hidden beneath the ice of East Antarctica
Deep under the Antarctic ice sheet, there may be a chasm that’s as deep as the Grand Canyon, but many times longer, according to new geologic research led by scientists with Durham University.
The canyon system is made up of a chain of winding and linear features buried under several kilometres of ice in one of the last unexplored regions of the Earth’s land surface: Princess Elizabeth Land (PEL) in East Antarctica. Continue reading “The grandest of canyons?”→
Geothermal exploration leads to unexpected discovery
FRISCO — Scientists exploring deep underground for geothermal resources in Australia got more than they bargained for when they found signs of an ancient 400-kilometer-wide impact zone from a huge meteorite that broke in two moments before it slammed into the Earth.
Wind, water and ice are shown once again to be key geological drivers
FRISCO — Scientists have not only solved the mystery of the moving rocks at Death Valley’s Racetrack Playa — they documented the movement on video and even took measurements by attaching GPS units to some “non-native” rocks as part of a research project in the Southern California desert.
FRISCO — A rockslide has closed portions of Dinosaur National Monument, According to the National Park Service, the slide has resulted in the closure of NPS lands from the boundary of the monument and the U.S. Fish and Wildlife Service hatchery to Ely Creek.
The first rock slide was reported June 18, when a large slab of rock broke free from a cliff face just a short distance inside the monument boundary, less than .25 miles from the Jones Hole Fish Hatchery. One fisherman reported having to run from a boulder that landed in the stream not too far from his location. After receiving reports, park rangers checked the scene and did not see any further activity. Continue reading “Massive rockslide closes parts of Dinosaur Nat’l Monument”→
FRISCO —In what must have been incredible displays of fire and ice, ancient volcanoes once erupted under massive glacial ice sheets, leaving deposits that could help paleoclimatologists unravel some ice age puzzles.
In a recent study, University of British Columbia researchers surveyed those deposits at the Kima’ Kho tuya, which erupted under an ice sheet about 1.8 million years ago. Their findings suggest that he ancient regional ice sheet through which the volcano erupted was twice as thick as previously estimated. Continue reading “Volcano study helps measure historic ice sheet thickness”→