Navigation Links
Researchers find origin of 'breathable' atmosphere half a billion years ago
Date:10/29/2007

COLUMBUS , Ohio -- Ohio State University geologists and their colleagues have uncovered evidence of when Earth may have first supported an oxygen-rich atmosphere similar to the one we breathe today.

The study suggests that upheavals in the earth's crust initiated a kind of reverse-greenhouse effect 500 million years ago that cooled the world's oceans, spawned giant plankton blooms, and sent a burst of oxygen into the atmosphere.

That oxygen may have helped trigger one of the largest growths of biodiversity in Earth's history.

Matthew Saltzman, associate professor of earth sciences at Ohio State, reported the findings Sunday at the meeting of the Geological Society of America in Denver .

For a decade, he and his team have been assembling evidence of climate change that occurred 500 million years ago, during the late Cambrian period. They measured the amounts of different chemicals in rock cores taken from around the world, to piece together a complex chain of events from the period.

Their latest measurements, taken in cores from the central United States and the Australian outback, revealed new evidence of a geologic event called the Steptoean Positive Carbon Isotope Excursion (SPICE).

Amounts of carbon and sulfur in the rocks suggest that the event dramatically cooled Earth's climate over two million years -- a very short time by geologic standards. Before the event, the Earth was a hothouse, with up to 20 times more carbon dioxide in the atmosphere compared to the present day. Afterward, the planet had cooled and the carbon dioxide had been replaced with oxygen. The climate and atmospheric composition would have been similar to today.

If we could go back in time and walk around in the late Cambrian, this seems to be the first time we would have felt at home, Saltzman said. Of course, there was no life on land at the time, so it wouldn't have been all that comfortable.

The land was devoid
'/>"/>

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

Page: 1 2 3 4

Related biology news :

1. Researchers discover way to make cells in the eye sensitive to light
2. Researchers find how protein allows insects to detect and respond to pheromones
3. Researchers Uncover Key Step In Manufacture of Memory Protein
4. NYU researchers simulate molecular biological clock
5. Researchers reveal the infectious impact of salmon farms on wild salmon
6. Researchers identify target for cancer drugs
7. Vital step in cellular migration described by UCSD medical researchers
8. ASU researchers finds novel chemistry at work to provide parrots vibrant red colors
9. UCSD researchers maintain stem cells without contaminated animal feeder layers
10. Researchers discover molecule that causes secondary stroke
11. Researchers find missing genes of ancient organism
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/23/2014)... the nasty habit of getting tangled and forming knots. ... learn how to disentangle them (e.g. useful for gene ... for Advanced Studies (SISSA) in Trieste and his team ... these knots and their dynamics. In their latest paper, ... Micheletti together with Marco Di Stefano, first author and ...
(Date:7/23/2014)... German . ... some of which might be very different from ours. ... produced by sunlight in the atmosphere to calibrate their ... for Ornithology in Seewiesen, Germany, and Queen,s University Belfast ... active mammal, the greater mouse-eared bat, has the capability ...
(Date:7/23/2014)... no cure exists for Alzheimer,s disease, the devastating ... But scientists are now reporting new progress on ... treatment, that shows promise as a potential oral ... Journal of Medicinal Chemistry . , Carlo ... in a healthy brain, the protein known as ...
Breaking Biology News(10 mins):Bats use the evening sky's polarization pattern for orientation 2
... Pop culture heedlessly and wrongly lumps these ... because the creatures flew, they were birdlike in many ways, ... Now comes what is believed to be ... into flight required pterosaurs to use four limbs: two were ...
... of the American Dietetic Association features research studies focusing ... sack lunches may not always meet the nutritional needs of ... diets of young adults. Packing a Lunch for ... 13 million children in the United States eat three or ...
... CAA lack of technology needed to explore and monitor ... critical bottleneck for Earth scientists, conservationists, and forest managers. ... composition and function of these forests and how they ... other threats. Gregory Asner and his team at the ...
Cached Biology News:Four, three, two, one . . . pterosaurs have lift off 2News from the January 2009 Journal of the American Dietetic Association 2New rainforest mapping technology gets huge support 2
(Date:7/23/2014)... 2014  GrowBLOX Sciences, Inc. (OTCQB: GBLX), a medical cannabis ... for two medical marijuana dispensary locations in Las ... the Clark County, Nevada dispensary for ... previously announced.  GrowBLOX Sciences, CEO Craig Ellins ... applications for dispensaries in the City of Las ...
(Date:7/23/2014)... Columbia, MD (PRWEB) July 23, 2014 ... Booth and ChirpE Mobile App, AACC Pathfinder, in its ... event offerings. AACC’s annual meeting is planned for July ... is the place to be to connect with global ... medicine, lab management, and other areas of breaking science ...
(Date:7/22/2014)... phylum so full of mean little creatures, the yellow-colored Ormia ... -- at least to crickets. Native to the southeastern U.S. ... sort of parasite. It swoops onto the back of a ... its wicked brood to invade, kill and consume the cricket ... possible without the fly,s ability to find a cricket -- ...
(Date:7/22/2014)... Nuclear reactors are used to produce ... fission chain reaction in nuclear reactors is used to ... drive a power- generating turbine. Currently nuclear reactors are ... electricity production. Nuclear reactor market is expected to grow ... proposed nuclear reactor projects. , Early buyers will receive ...
Breaking Biology Technology:GrowBLOX Sciences, Inc. Files for Two Additional Medical Marijuana Dispensaries in Las Vegas 2GrowBLOX Sciences, Inc. Files for Two Additional Medical Marijuana Dispensaries in Las Vegas 3AACC Enhances Attendee Experience at Its 2014 Annual Meeting & Clinical Lab Expo with a2z-Powered ChirpE Photo Booth and Mobile App 2AACC Enhances Attendee Experience at Its 2014 Annual Meeting & Clinical Lab Expo with a2z-Powered ChirpE Photo Booth and Mobile App 3Fly-inspired sound detector 2Fly-inspired sound detector 3Fly-inspired sound detector 4Nuclear Energy Market: Global Industry Analysis, Size, Share, Analysis, Growth and Forecast 2013 - 2019 2Nuclear Energy Market: Global Industry Analysis, Size, Share, Analysis, Growth and Forecast 2013 - 2019 3
... ,The dial-in code is: 3684539 To view ... Upcoming Financial Date: February 2012 ... 2011 This press release contains statements about ... of these statements cannot be guaranteed as they are ...
... Oncology announces completion of a phase I Small Business ... Cancer Institute (NCI).  The SBIR grant project ... (JIT) to enroll cancer patients into clinical trials. ... with qualifying diagnoses across many research practices. Patients who ...
... Oct. 20, 2011 Med track is pleased ... 2011. Attendees of the show will be the first ... the newly designed platform. With deeply integrated datasets and ... professionals in business development, competitive intelligence and sales and ...
Cached Biology Technology:Nine-Month Figures for 2011: Dynamic, Profitable Growth at Sartorius 2Pharmatech Oncology Announces Completion of SBIR Grant Research 2Be One of the First to Experience the New Medtrack Platform at BIO®-Europe 2011 2
Anti-G-alpha-i 1 G-Protein Host: mouse monoclonal Species Reactivity: human, mouse, rat Applications: WB Storage: 4C...
oligophrenin-1 (H-100)...
Mouse monoclonal [DAPK-55] to DAP Kinase 1 ( Abpromise for all tested applications). entrezGeneID: 1612 SwissProtID: P53355...
Mouse monoclonal [1.T.4] to WAVE 1 ( Abpromise for all tested applications). Antigen: His6 fusion protein corresponding to full-length rat WAVE1. Entrez Gene ID: 8936...
Biology Products: