Featured Research

from universities, journals, and other organizations

Clinker geochronology, the first glacial maximum, and landscape evolution in the northern Rockies

Date:
June 28, 2011
Source:
The Geological Society of America
Summary:
Scientists have developed and successfully carried out a novel, extraordinary technique for learning how efficiently river channels cut and increase local topographic relief: They have used the exposure of "clinker" deposits in combination with highly refined dating techniques.

Peter W. Reiners of the University of Arizona and colleagues have developed and successfully carried out a novel, extraordinary technique for learning how efficiently river channels cut and increase local topographic relief: They have used the exposure of "clinker" deposits in combination with highly refined dating techniques.

Related Articles


Clinkers are baked coals; baking naturally occurs in shallow depths (tens of meters) and when the clinkers are exhumed during erosion and the development of topographic relief, they are resistant and the rate of exposure can be timed using the U-Th/He isotopic system found in zircons within the clinkers.

In this application, the Reiners and colleagues determined aspects of the pace of recent evolution of Powder River Basin in northern Wyoming and southern Montana. Ages of in-situ clinkers range from as old as 1.1 million years to as young as 10,000 years, but most formed in one of the last three interglacial periods, reflecting either changes in fluvial downcutting caused by glacial-interglacial cycles or other climatic effects on rates of natural coal burning. Clinker deposits atop a broad terrace in the northern part of the Powder River Basin provide a maximum age of 2.6 plus or minus 0.2 million years for terrace formation.

This corresponds to the onset of major Northern Hemisphere glaciation interpreted from marine records, suggesting that the terrace formed by lateral erosion of the landscape as rivers were overwhelmed with sediment during the earliest Plio-Pleistocene glacial episode. The overall correlation of clinker ages with elevation above local base level suggests generally increasing incision and topographic relief in the Basin over at least the last one million years, at rates of ~0.1-0.3 km/million years.


Story Source:

The above story is based on materials provided by The Geological Society of America. Note: Materials may be edited for content and length.


Journal Reference:

  1. Peter W. Reiners, Catherine A. Riihimaki, Edward L. Heffern. Clinker geochronology, the first glacial maximum, and landscape evolution in the northern Rockies. GSA Today, 2011; 4 DOI: 10.1130/G107A.1

Cite This Page:

The Geological Society of America. "Clinker geochronology, the first glacial maximum, and landscape evolution in the northern Rockies." ScienceDaily. ScienceDaily, 28 June 2011. <www.sciencedaily.com/releases/2011/06/110628094820.htm>.
The Geological Society of America. (2011, June 28). Clinker geochronology, the first glacial maximum, and landscape evolution in the northern Rockies. ScienceDaily. Retrieved October 31, 2014 from www.sciencedaily.com/releases/2011/06/110628094820.htm
The Geological Society of America. "Clinker geochronology, the first glacial maximum, and landscape evolution in the northern Rockies." ScienceDaily. www.sciencedaily.com/releases/2011/06/110628094820.htm (accessed October 31, 2014).

Share This



More Earth & Climate News

Friday, October 31, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

How A Chorus Led Scientists To A New Frog Species

How A Chorus Led Scientists To A New Frog Species

Newsy (Oct. 30, 2014) A frog noticed by a conservationist on New York's Staten Island has been confirmed as a new species after extensive study and genetic testing. Video provided by Newsy
Powered by NewsLook.com
Raw: Hawaii Lava Approaching Village Road

Raw: Hawaii Lava Approaching Village Road

AP (Oct. 30, 2014) The lava flow on the Big Island of Hawaii was 225 yards from Pahoa Village Road on Wednesday night. The lava is slowing down but still approaching the village. (Oct. 30) Video provided by AP
Powered by NewsLook.com
Endangered Carpathian Ponies Are Making a Comeback in Poland

Endangered Carpathian Ponies Are Making a Comeback in Poland

AFP (Oct. 29, 2014) At the foot of the rugged Carpathian mountains near the Polish-Ukrainian border, ranchers and scientists are trying to protect the Carpathian pony, known as the Hucul in Polish. Duration: 02:17 Video provided by AFP
Powered by NewsLook.com
Deadly Mudslide in Sri Lanka Buries Houses

Deadly Mudslide in Sri Lanka Buries Houses

AP (Oct. 29, 2014) A mudslide triggered by monsoon rains buried scores of workers' houses at a tea plantation in central Sri Lanka on Wednesday, killing at least 10 people and leaving more than 250 missing, an official said. (Oct. 29) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins