Navigation Links
Volcanoes played pivotal role in ancient ice age, mass extinction
Date:10/26/2009

p>The ash deposits demonstrated when the volcanoes stopped erupting; the strontium levels indicated that large amounts of volcanic rock were being eroded and the sediment was flooding Earth's oceans during this time; and the neodymium levels pinpointed the Appalachians as the source of the sediment.

The new findings mesh well with what scientists know about these ancient proto-Atlantic volcanoes, which are thought to have produced the largest eruptions in Earth's history. They issued enough lava to form the Appalachians, enough ash to cover the far ends of the earth, and enough carbon to heat the globe. Atmospheric carbon levels grew 20 times higher than they are today.

This study shows that when those volcanoes stopped erupting, carbon levels dropped, and the climate swung dramatically back to cold. The timing coincides with today's best estimates of temperature fluctuations in the Ordovician.

"The ash beds start building up at the same time the Appalachian weathering begins, but then the record of volcanism ends, and the temperature drops," Saltzman said. "Knowing these details can help us understand how carbon in the atmosphere is changing Earth's climate today."

Next, the researchers will examine the role of the ancient volcanic ash more closely. While the ash was in the atmosphere -- before it settled around the globe -- it might have blotted out the sun, and cooled the earth somewhat. Saltzman and his team want to make some estimate of this short-term cooling effect to refine their computer model.

Meanwhile, Young is just starting to re-analyze the same rock samples, this time looking for a different isotope -- sulfur. This, he hopes, will offer clues to how much oxygen was in the oceans, and how that oxygen may have affected life in the Ordovician.


'/>"/>

Contact: Matthew Saltzman
Saltzman.11@osu.edu
614-292-0481
Ohio State University
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. Rosetta Stone of supervolcanoes discovered in Italian Alps
2. Study compares sound from exploding volcanoes with jet engines
3. Volcanoes may have provided sparks and chemistry for first life
4. Studying volcanoes with balloons
5. Venus Express reboots the search for active volcanoes on Venus
6. Pivotal national trial uses newest interventional radiology treatment to bust blood clots in legs
7. Genetic sex determination let ancient species adapt to ocean life
8. Biologists discover death stench is a universal ancient warning signal
9. Ancient oceans offer new insight into the origins of animal life
10. Scientists help explain effects of ancient Chinese herbal formulas on heart health
11. Climate-caused biodiversity booms and busts in ancient plants and mammals
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Volcanoes played pivotal role in ancient ice age, mass extinction
(Date:9/15/2014)... skin and gut microbes influence processes from digestion to ... the most biodiverse terrestrial ecosystems on the planet, more ... in the tropics. Smithsonian scientists and colleagues working on ... from a single tree were home to more than ... 57 tree species contained more than 7,000 different kinds. ...
(Date:9/15/2014)... (September 15, 2014) The so-called central dogma ... proteinhas long provided a simplified explanation for how ... organisms. , In reality, of course, the ... first articulated nearly 60 years ago by Nobel ... structure. For one, there are multiple types of ...
(Date:9/15/2014)... A published study indicates that lowland tapir populations may ... on hunting. Researchers from the Office National de ... Guiana and San Diego Zoo Global reviewed data retrieved ... the last four years and compared this data to ... were placed on hunting tapirs in French Guiana," said ...
Breaking Biology News(10 mins):Smithsonian scientists discover tropical tree microbiome in Panama 2Scientists discover RNA modifications in some unexpected places 2
... As governments prepare to gather at the United ... and 20, a new report published by a group ... evidence that a combined approach to tackling poverty and ... education, and nutrition/food securityachieves better results for the world,s ...
... which extends to include the formal scientific naming of all ... in the procedure scientists need to follow when they describe ... ,International Code of Nomenclature for algae, fungi and plants, are ... article published in BioMed Central,s open access journal BMC ...
... for Research on Aging (Novato, CA) and Biotica Technology ... investigate polyketides in diseases of aging. Building on observations ... & Kennedy; Nature 2009), the collaborators will ... range of age-related disease models to identify novel therapeutics. ...
Cached Biology News:Report showcases success of integrated development approaches 2Report showcases success of integrated development approaches 3Bringing botany into the 21st Century 2Buck Institute and Biotica to investigate polyketides in extension of healthy lifespan 2
(Date:9/15/2014)...  iVinci Health LLC, the company behind the healthcare ... branded as VisitPay®, has successfully closed $5 million in ... a new extension to VisitPay® – an online Payment ... way for patients to manage their medical bills and ... their families. The new round of funding, ...
(Date:9/15/2014)... 2014 Applied Silicone Corporation, a ... the medical device and critical healthcare market, introduces ... implantable medical device market. The Dual Matrix ... a silicone gel with improved fracture resistance, cohesive ... consists of two crosslinked networks working in conjunction ...
(Date:9/15/2014)... ANNAPOLIS, Maryland , 15 de septiembre de 2014 /PRNewswire/ ... se llevará a cabo del 12 al 18 de ... Association (PPTA) y de sus compañías miembro s, ... de la concienciación mundial en torno a la colección de ... los donantes de plasma al salvar y mejorar las vidas ...
(Date:9/14/2014)... 15, 2014 UMBC’s Biotechnology Graduate ... Tuesday, October 21, 2014, from 12:00 to 1:00 p.m. ... program’s innovative curriculum and practice-oriented instruction, designed for working ... can help advance their career in the biotechnology industry. ... . , About UMBC’s Biotechnology Graduate Programs, UMBC ...
Breaking Biology Technology:iVinci Health Raises $5M to Fuel National Expansion, Announces Launch of Personal Finance Portal for Healthcare 2iVinci Health Raises $5M to Fuel National Expansion, Announces Launch of Personal Finance Portal for Healthcare 3Applied Silicone Launches Silicone Gel System with Dual Matrix Technology 2La International Plasma Awareness Week será una celebración para los donantes 2La International Plasma Awareness Week será una celebración para los donantes 3UMBC Biotechnology Graduate Programs’ Virtual Info Session, October 21, 2014 2
... organizations see security and compliance as their top issues, they ... There is a big secret that few executives know about ... issue. It goes beyond knowing virus scans and firewalls. Security ... strategy and not a low-level function. , ,In several semesters ...
... trend away from IPOs and the progress of six regional ... Fund I annual meeting, held at the Wisconsin Athletic Club. ... Mason Wells met in Milwaukee to hear a speech ... Association , and listen to updates from six firms that ...
... Bone Care International Inc. announced on Wednesday that the ... ,Genzyme and Bone Care have signed a definitive agreement for ... transaction valued at $33.00 per fully diluted share. ... Care's shareholders at a meeting on June 30, and other ...
Cached Biology Technology:To find solid security candidates, look beyond tech certificates 2To find solid security candidates, look beyond tech certificates 3To find solid security candidates, look beyond tech certificates 4VC trends, company progress discussed at Mason Wells portfolio meeting 2VC trends, company progress discussed at Mason Wells portfolio meeting 3VC trends, company progress discussed at Mason Wells portfolio meeting 4
... Polymorphic DNA Technologies offers a comprehensive SNP ... for SNP discovery by performing a service ... amplification, DNA sequencing and data analysis. ... Polymorphic uses the gold standard in DNA ...
... Sub-Cell Model 192 and PowerPac basic power supply ... nucleic acids in agarose gels. This Model 192 ... 15 cm UV-transparent gel tray with fluorescent ruler, ... supply, 100-120 and 220-240 V, provides output of ...
... you reduce the chance of error. Thats ... Developed using Beckman Coulters extensive experience in ... technology, the CEQ 8000 is a fully ... fills the capillary array with a patented ...
The optional fixed lens, 105 mm, is for use with the VersaDoc imaging systems for imaging small samples at high resolution....
Biology Products: