Tag: Geology

The grandest of canyons?

The ice fields of Antarctica
Is the world’s largest canyon hidden under the Antarctic Ice Sheet? @bberwyn photo.

Researchers find vast chasm hidden beneath the ice of East Antarctica

Staff Report

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?”

Australian scientists find largest-ever meteor impact zone

dsfg
Earth hs often been marked by meteor impacts, and a new impact zone in Australia may the largest ever. Photo via USGS.

Geothermal exploration leads to unexpected discovery

Staff Report

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.

The crater from the impact millions of years ago has long disappeared. But a team of geophysicists has found the twin scars of the impacts — the largest impact zone ever found on Earth — hidden deep in the earth’s crust. Continue reading “Australian scientists find largest-ever meteor impact zone”

Mystery solved: Scientists document motion of rocks at Death Valley’s Racetrack Playa

kj
Study solves mystery of Death Valley’s moving rocks. Photo courtesy National Park Service.

Wind, water and ice are shown once again to be key geological drivers

Staff Report

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.

Some of the rocks weigh up to 100 pounds and leave behind distinct tracks as they scoot across the dry lake bed. Scientists have been studying the area for decades, but nobody has seen the process in action until now, according to a press release from the Scripps Institution of Oceanography (UC San Diego). Continue reading “Mystery solved: Scientists document motion of rocks at Death Valley’s Racetrack Playa”

Study: Lightning a major factor in shaping mountains

Compass readings help trace the impact of electrical storms

Summit County Colorado monsoon season.
A bolt of lightning strikes near the Continental Divide, in Summit County, Colorado.

By Summit Voice

Geologists in South Africa say that lighting strikes are significant factor in shaping the summit areas of mountains, thereby shaping the evolution of mountain landscapes. Specifically, they found that many angular rock formations in the Drakensberg Mountains are caused by lightning blasts — and not necessarily by the melt-freeze cycle as commonly assumed. Continue reading “Study: Lightning a major factor in shaping mountains”

Massive rockslide closes parts of Dinosaur Nat’l Monument

100-foot chunk of rock breaks off canyon wall

The large lighter-colored area indicates the extent of the rock slide above Jones Hole Creek as seen from the fish hatchery
The large lighter-colored area indicates the extent of the rock slide above Jones Hole Creek as seen from the fish hatchery in Dinosaur National Monument. Photo via NPS.

By Summit Voice

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”

Volcano study helps measure historic ice sheet thickness

UBC geologists examine pyroclastic deposits near summit of tephra cone on south side of Kima'Kho. Key attributes of these deposits established that they were deposited above the level of a surrounding englacial lake.
UBC geologists examine pyroclastic deposits near summit of tephra cone on south side of Kima’Kho. Key attributes of these deposits established that they were deposited above the level of a surrounding englacial lake. Photo courtesy UBC Science.

Ancient tuyas hold climate clues

By Summit Voice

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”

Does climate affect volcanic activity?

asdf
Mt. St. Helens erupts in 1980. Photo courtesy USGS.

New research suggests melting ice sheets could trigger more vulcanism

By Summit Voice

SUMMIT COUNTY — Melting ice sheets may trigger an increase in global volcanic activity, according to researchers with the GEOMAR Helmholtz Centre for Ocean Research (based in Kiel, Germany), and Harvard, who matched historic geological records of vulcanism with warm climate periods.

“In times of global warming, glaciers on the continents are melting relatively quickly. At the same time the sea level rises. The weight on the continents decreases, while the weight on the oceanic tectonic plates increases. Thus, the stress changes within in the earth to open more routes for ascending magma,” said GEOMAR’s Dr Mario Jegen. Continue reading “Does climate affect volcanic activity?”