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 January 28, 2015 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 January 28, 2015).

Share This


More From ScienceDaily



More Earth & Climate News

Wednesday, January 28, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Scientists Say Earliest Snakes Lived Alongside The Dinosaurs

Scientists Say Earliest Snakes Lived Alongside The Dinosaurs

Newsy (Jan. 28, 2015) Wrongly categorized as lizard fossils, snake fossils now show the reptile could have developed earlier than we thought — 70 million years earlier. Video provided by Newsy
Powered by NewsLook.com
Time Lapse: Sculptures Created from 30 Tons of Snow

Time Lapse: Sculptures Created from 30 Tons of Snow

Rumble (Jan. 28, 2015) Students in North Finland use 30 tons of snow and one ton of ice to build a massive photography display and sculpture installation. Five days of work condensed into a one-minute time lapse! Video provided by Rumble
Powered by NewsLook.com
Aquaponics Turn Suburban Industrial Park Into Farmland: Hume

Aquaponics Turn Suburban Industrial Park Into Farmland: Hume

The Toronto Star (Jan. 27, 2015) Ancient techniques of growing greens with fish and water are well ahead of Toronto bylaws. Video provided by The Toronto Star
Powered by NewsLook.com
Madagascar Locust Plague Could Mean Famine For Millions

Madagascar Locust Plague Could Mean Famine For Millions

Newsy (Jan. 27, 2015) The Food and Agriculture Organization says millions could face famine in Madagascar without more funding to finish locust eradication efforts. Video provided by Newsy
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