Origin of the Blue Mountains studied

Oct 30, 2007

A U.S. study suggests northern Oregon's Blue Mountains may have originated from the Klamath Mountains of southern Oregon and the Sierra Nevada of California.

The finding comes from radioactive isotope dating of grains of the mineral zircon taken from Blue Mountain basins in northeastern Oregon. The approximate ages of the Blue Mountain zircon grains match the ages of rocks to the south in the Klamath and Sierra Nevada mountains.

University of Oregon doctoral student Todd LaMaskin said the westernmost chain of U.S. mountains and basins might have been continuous from California to Oregon millions of years ago.

"So we think at this point that we may have the most definitive evidence to date that during in Jurassic time there was a connection between the rocks of the Blue Mountains and the northern Sierra Nevadas and eastern Klamath ranges," said LaMaskin.

He and his adviser, Professor Rebecca Dorsey, along with Washington State University Professor Jeffrey Vervoort presented their findings Monday in Denver during the annual meeting of the Geological Society of America.

Copyright 2007 by United Press International

Explore further: NASA's HS3 mission spotlight: The HIRAD instrument

add to favorites email to friend print save as pdf

Related Stories

New meteor shower "just a memory" of what once was there

25 minutes ago

The weak display of last month's Camelopardalids meteor shower, the result of the close passage of comet 209P/LINEAR, may have disappointed backyard observers, but this never-before-seen shower now has scientists ...

Exotic state of matter propels quantum computing theory

54 minutes ago

So far it exists mainly in theory, but if invented, the large-scale quantum computer would change computing forever. Rather than the classical data-encoding method using binary digits, a quantum computer would process information ...

Recommended for you

Fires in Central Africa During July 2014

46 minutes ago

Hundreds of fires covered central Africa in mid-July 2014, as the annual fire season continues across the region. Multiple red hotspots, which indicate areas of increased temperatures, are heavily sprinkled ...

NASA's HS3 mission spotlight: The HIRAD instrument

10 hours ago

The Hurricane Imaging Radiometer, known as HIRAD, will fly aboard one of two unmanned Global Hawk aircraft during NASA's Hurricane Severe Storm Sentinel or HS3 mission from Wallops beginning August 26 through ...

Fires in the Northern Territories July 2014

Jul 23, 2014

Environment Canada has issued a high health risk warning for Yellowknife and surrounding area because of heavy smoke in the region due to forest fires. In the image taken by the Aqua satellite, the smoke ...

User comments : 0