Skip to comments.Wind can keep mountains from growing
Posted on 03/28/2011 7:40:41 PM PDT by decimon
Wind is a much more powerful force in the evolution of mountains than previously thought, according to a new report from a University of Arizona-led research team.
Bedrock in Central Asia that would have formed mountains instead was sand-blasted into dust, said lead author Paul Kapp.
"No one had ever thought that wind could be this effective," said Kapp, a UA associate professor of geosciences. "You won't read in a textbook that wind is a major process in terms of breaking down rock material."
Rivers and glaciers are the textbook examples of forces that wear down mountains and influence their evolution.
Wind can be just as powerful, Kapp said. He and his colleagues estimate wind can be 10 to 100 times more effective in eroding mountains than previously believed.
The team's paper, "Wind erosion in the Qaidam basin, central Asia: implications for tectonics, paleoclimate, and the source of the Loess Plateau," is in the April/May issue of GSA Today.
Kapp's co-authors are Jon D. Pelletier and Joellen Russell of the UA; Alexander Rohrmann, formerly of the UA and now at the University of Potsdam in Germany; Richard Heermance of California State University, Northridge; and Lin Ding of the Chinese Academy of Sciences, Beijing. The American Chemical Society Petroleum Research Fund and a UA Faculty Small Grant funded the research.
The geoscientists figured out wind's rock-sculpting abilities by studying gigantic wind-formed ridges of rock called yardangs.
Kapp first learned about yardangs when reviewing a scientific paper about Central Asia's Qaidam Basin. To see the geology for himself, he booted up Google Earth -- and was wowed by what he saw.
"I'd never seen anything like that before," he said. "I didn't even know what a yardang was."
Huge fields of yardangs that can be seen from space look like corduroy. Wind had scoured long gouges out of the bedrock, leaving the keel-shaped ridges behind. Kapp wondered where the missing material was.
The team's initial research was conducted using geological maps of the region and satellite images from Google Earth. Then Kapp and his team went to the Qaidam Basin to collect more information about the yardangs, the history of wind erosion and the dust.
"What we're proposing is that during the glacials, when it's colder and drier, there's severe wind erosion in the Qaidam basin and the dust gets blown out and deposited downwind in the Loess Plateau," Kapp said.
The term "loess" refers to deposits of wind-blown silt. Parts of the U.S. Midwest have large deposits of loess.
"Up until 3 million years ago, the basin was filling up with sediment," he said. "Then like a switch, the wind turned on and basin sediments get sandblasted away."
Known as the "bread basket of China," the Loess Plateau is the largest accumulation of dust on Earth. Scientists thought most of the dust came from the Gobi Desert.
In contrast, Kapp and his colleagues suggest more than half of the dust came from the Qaidam Basin. Co-author Pelletier, a UA geomorphologist, created a computer model indicating that dust from the basin could have formed the plateau.
The wind is not having such effects now because the climate is different, Kapp said. Co-author Russell plus other research groups suggest the westerly winds shift north during interglacial periods like that of the current climate and shift toward the equator during glacial periods.
Therefore since the last Ice Age ended about 11,000 years ago, the winds have blown from the Gobi Desert toward the Loess Plateau. During glacial periods, the winds blew from the Qaidam basin toward the Loess Plateau instead.
"During the interglacials, the basin fills up with lakes. When it goes back to a glacial period, lake sediments blow away," he said. "Our hypothesis is that you have lake development, then wind erosion, lake development, wind erosion, lake development and so on."
The team suggests wind erosion also influenced how fast the basin's bedrock is folded. In Central Asia, bedrock folds and crumples because it's being squeezed as the Indian plate collides with the Asian plate.
"The folding accelerated 3 million years ago," Kapp said. "That's when the wind erosion turned on. I don't think it's a coincidence."
During the glacial periods, the winds whisked sediment out of the basin. As a result, the bedrock deformed faster because it was no longer weighed down by all the sediment.
Kapp calls the process "wind-enhanced tectonics." The term "tectonics" refers to forces that cause movements and deformation of the Earth's plates.
The whole process is driven by global climate change, he said. "The unifying theme is wind."
Kapp and his team are quantifying the processes further as they analyze more samples they brought back from the Qaidam basin and Loess Plateau.
Researcher contact: Paul Kapp 520-626-8763 firstname.lastname@example.org
Related Web sites:
Paul Kapp http://www.geo.arizona.edu/~pkapp/
GSA Today http://www.geosociety.org/gsatoday/
Credit: Paul Kapp, University of Arizona.
Usage Restrictions: This photo may be used only to illustrate a story about the research described in the accompanying release, Wind Can Keep Mountains from Growing. The photo credit must be included with the image.
Winding down ping.
“He and his colleagues estimate wind can be 10 to 100 times more “
I estimate it to be 10 to 10,000 times.
In the ‘olden’ days , we used to call this ‘sandblasting’.
Odd how such areas as the one in the article (and some others I can think of) are so near a desert.
Really interesting. I went on Google Earth and will go back but the article does seem to relate to some of what you see.
Illinois is covered with the stuff. It has some neat properties in that you can make a vertical cut through it and it doesn’t slump down as sand would.
What that picture brings to mind is that, long ago, where that man is standing would have been several hundred feet under the BOTTOM of the Ocean.
That's odd. I learned as a child that wind erosion was a major factor in shaping rocks and land topography.
I believe it. Came off a ski lift on the top of the mountain at Tahoe a few weeks ago and felt like my face was being sandblasted. Got down the hill fast as I could. I can only imagine what a million years of that could do to solid rock.
"How long is eternity? Imagine the tallest mountains known, made of the hardest rock.
Now imagine a scarf of the finest silk brushing against those mountains every day.
When those mountains have been reduced to dust by that scarf, that is the beginning of eternity."
But not a close encounter with another celestial body, nope, never.Earth throws a wobblyThe Chandler Wobble, a mysterious wobble that shakes the Earth as it spins on its axis, was first detected in 1891 by an American astronomer called Seth Carlo Chandler. The force of the wobble is such that it is capable of moving the North Pole about six metres (20 feet) from where it should be and lasts around 433 days, or just 1.2 years. Scientists originally calculated that this phenomenon should naturally run out of steam after 68 years unless some force keeps activating it. And this is precisely what appears to happen. NASA's Richard Gross says the principle causes of the wobble are fluctuating pressures on the bottom of the oceans, the result of changes in temperature, salinity and wind patterns. Dr Michael Tsimplis, from the Southampton Oceanography Centre, UK, says that the Gross theory is plausible. "Any stress you apply to the surface of the Earth can affect its axis," he said.
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I guess my 1950s college geology professors were far ahead of their time. I learned about the tremendous erosional power of wind back then, in the "olden days."
I learned about wind erosion in general science class back in the day.......
Also by hearing stories about the "dust bowl" from my parents and grandparents, uncles and aunts and other "older" folk.
I reckon people back in the 30' - 40's were far ahead of their time.
so answer this smart guy:
how come my butt isnt smaller?
Yer not ‘angin’ it oot in the breeze enough, m’dear.
Guess the direction of the ocean currents here...