Featured Research

from universities, journals, and other organizations

Long Lava Flows May Have Taken Years, Causing Global Cooling And Extinctions

Date:
October 28, 1998
Source:
American Geophysical Union
Summary:
A multidisciplinary group of scientists is challenging the century old theory that long lava flows must be formed by massive, but short lived, volcanic eruptions. Their research, reported in the Journal of Geophysical Research, suggests that some ancient flows of up to 100 miles in length built up gradually over years, rather than quickly in just days. This finding could have broad implications for the study of Earth and nearby planets.

WASHINGTON, D.C. - A multidisciplinary group of scientists is challenging the century old theory that long lava flows must be formed by massive, but short lived, volcanic eruptions. Their research, reported in the Journal of Geophysical Research, suggests that some ancient flows of up to 100 miles in length built up gradually over years, rather than quickly in just days. This finding could have broad implications for the study of Earth and nearby planets.

Related Articles


One result of long but slow moving lava flows may have been global cooling caused by continuing emissions of sulphur dioxide. This cooling could have caused many major extinctions during the past 500 million years. For example, a major eruption in the North Atlantic might have wiped out most dinosaurs by eliminating their plant food supply, even before the presumed asteroid impact that finished the job.

The study is not limited to Earth. Lava flows significantly longer than any known on Earth have been observed on Venus, Mars, and the Moon, and their excellent exposure, coupled with improved spacecraft imagery may actually make them easier to study.

The latest findings on long lava flows are reported in the November 10 issue of the Journal of Geophysical Research, published by the American Geophysical Union. A special section of the journal is devoted to follow-up studies developed from an AGU conference at James Cook University in Townsville, Queensland, Australia. The meeting brought together volcanologists working on active flows in various parts of the world, other volcanologists analyzing flood basalt lava flows, planetary geologists, marine geologists, theoreticians, and economic geologists studying ancient ore-bearing lava flows.

The duration of a lava flow affects the amount of sulfur dioxide released into the atmosphere and therefore the degree of global cooling it causes. This cooling effect was noted following the relatively small eruption of the Laki volcano in Iceland in 1783. Therefore, the study of both active lava flows and ancient long lava flows can help in the assessment of future hazards. For example, there is now is an increased awareness of the role of lava tubes, through which molten lava can be transported over great distances with little loss of temperature. These tubes may play a role in future volcanic eruptions by carrying large amounts of lava to distant populated areas, as they have in the past.


Story Source:

The above story is based on materials provided by American Geophysical Union. Note: Materials may be edited for content and length.


Cite This Page:

American Geophysical Union. "Long Lava Flows May Have Taken Years, Causing Global Cooling And Extinctions." ScienceDaily. ScienceDaily, 28 October 1998. <www.sciencedaily.com/releases/1998/10/981028075540.htm>.
American Geophysical Union. (1998, October 28). Long Lava Flows May Have Taken Years, Causing Global Cooling And Extinctions. ScienceDaily. Retrieved December 22, 2014 from www.sciencedaily.com/releases/1998/10/981028075540.htm
American Geophysical Union. "Long Lava Flows May Have Taken Years, Causing Global Cooling And Extinctions." ScienceDaily. www.sciencedaily.com/releases/1998/10/981028075540.htm (accessed December 22, 2014).

Share This


More From ScienceDaily



More Earth & Climate News

Monday, December 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

New Fish Species Discovered, Setting Record for World's Deepest

New Fish Species Discovered, Setting Record for World's Deepest

Buzz60 (Dec. 22, 2014) A new species of fish is discovered living five miles beneath the ocean surface, making it the deepest living fish on earth. Jen Markham has the story. Video provided by Buzz60
Powered by NewsLook.com
Raw: Lava Inches Closer to Highway

Raw: Lava Inches Closer to Highway

AP (Dec. 21, 2014) Officials have opened a new road on Hawaii's Big Island for drivers to take care of their daily needs if encroaching lava from Kilauea Volcano crosses a highway and cuts them off from the rest of the island. (Dec. 20) Video provided by AP
Powered by NewsLook.com
Could Cheap Oil Help Fix U.S. Roads?

Could Cheap Oil Help Fix U.S. Roads?

Newsy (Dec. 21, 2014) As falling oil prices boost Americans' spending power, the U.S. government is also gaining flexibility from savings on oil. Video provided by Newsy
Powered by NewsLook.com
Raw: Russian Surfers Brave Icy Cold Waters

Raw: Russian Surfers Brave Icy Cold Waters

AP (Dec. 20, 2014) Surfers in Russia's biggest port city on the Pacific Ocean, Vladivostok, were enjoying the sport on Saturday despite below freezing temperatures and icy cold waters. (Dec. 20) 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