Navigation Links
Seismic images show dinosaur-killing meteor made bigger splash
Date:1/23/2008

AUSTIN, TexasThe most detailed three-dimensional seismic images yet of the Chicxulub crater, a mostly submerged and buried impact crater on the Mexico coast, may modify a theory explaining the extinction of 70 percent of life on Earth 65 million years ago.

The Chicxulub crater was formed when an asteroid struck on the coast of the Yucatan Peninsula. Most scientists agree the impact played a major role in the KT Extinction Event that caused the extinction of most life on Earth, including the dinosaurs.

According to Sean Gulick, a research scientist at the Institute for Geophysics at The University of Texas at Austins Jackson School of Geosciences and principal investigator for the project, the new images reveal the asteroid landed in deeper water than previously assumed and therefore released about 6.5 times more water vapor into the atmosphere.

The impact site also contained sulfur-rich sediments called evaporites, which would have reacted with water vapor to produce sulfate aerosols. According to Gulick, an increase in the atmospheric concentration of the compounds could have made the impact deadlier in two ways: by altering climate (sulfate aerosols in the upper atmosphere can have a cooling effect) and by generating acid rain (water vapor can help to flush the lower atmosphere of sulfate aerosols, causing acid rain). Earlier studies had suggested both effects might result from the impact, but to a lesser degree.

The greater amount of water vapor and consequent potential increase in sulfate aerosols needs to be taken into account for models of extinction mechanisms, says Gulick.

The results appear in the February 2008 print edition of the journal Nature Geosciences.

An increase in acid rain might help explain why reef and surface dwelling ocean creatures were affected along with large vertebrates on land and in the sea. As it fell on the water, acid rain could have turned the oceans more acidic. There is
'/>"/>

Contact: Marc Airhart
mairhart@jsg.utexas.edu
512-471-2241
University of Texas at Austin
Source:Eurekalert

Page: 1 2

Related biology news :

1. MIT creates 3-D images of living cell
2. Meteor no longer prime suspect in great extinction
3. Economists: Reduce fish catch now for bigger net profits later
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:10/1/2014)... prairies and forests of the world can also be ... to a surprising new study led by Colorado State ... The research team analyzed 596 soil samples collected from ... diversity of below-ground life, most of which had never ... 16.2 percent of the organisms discovered in the park ...
(Date:9/30/2014)... of moorland burning is published today in the first ... of relieving tensions on both sides of the grouse ... Moorland Burning on the Ecohydrology of River basins) project ... practised predominantly to support red grouse populations for gun ... chemistry and physical properties, river water chemistry and river ...
(Date:9/30/2014)... --- Do we think of nature as something that we ... need to "preserve?" Or do we think of ourselves as ... of nature, but what about a house? , The ... also reflected in our actions, our speech and in cultural ... the University of Washington, the American Indian Center of Chicago ...
Breaking Biology News(10 mins):Microbes in Central Park soil: If they can make it there, they can make it anywhere 2Microbes in Central Park soil: If they can make it there, they can make it anywhere 3Grouse moor burning causes widespread environmental changes 2The cultural side of science communication 2
... Helsinki and Sibelius Academy, Helsinki, the neurobiological basis ... evaluated using candidate genes associated in the earlier ... data consisted of 343 family members from 19 ... and/or active amateurs. The musical aptitude was assessed ...
... In a new study published in Disease Models & ... the influence of known cancer genes on the development and ... with limited treatment options. Inside the cell, signals are ... or even die. Cancer often results when the molecules ...
... Thank parasites for making some of our immune proteins into ... genetics study that will appear in the June 8 issue ... 25). The study, conducted by a team of researchers in ... some of those genes into risk factors for intestinal disorders. ...
Cached Biology News:The neurobiology of musicality related to the intrinsic attachment behavior? 2Zebrafish provide a model for cancerous melanoma in humans 2Immune genes adapt to parasites 2
(Date:10/1/2014)... The U.S. Department of Labor has ... Edwardsville as part of the Trade Adjustment Assistance Community ... co-administered by the Department of Labor and Department of ... Thomas E. Perez and Secretary of Education Arne Duncan ... grants to nearly 270 colleges across the country. ...
(Date:9/30/2014)... in German . ... dots in a semiconductor layer. Quantum dots are small structures ... If a short laser pulse is fired at the photonic ... experiences a change in the electromagnetic field around it. This ... light by the dot. As soon as the refractive index ...
(Date:9/30/2014)... AMHERST, Mass. Using a bio-mimicking analog of ... of grass, an international research team led by ... has taken a major step in developing long-sought ... to electricity for use in electronic devices. ... UMass Amherst and others at Stanford University and ...
(Date:9/30/2014)... Shimadzu Scientific Instruments has released the DSES-1000 ... tool for measuring displacement in rubber and other ... movement distance, the DSES-1000 can measure elongations up ... 10 mm. In addition, it achieves +/- 0.2 ... within +/- 100 µm below 50-mm stroke. , ...
Breaking Biology Technology:U.S. Dept. of Labor Awards SIUE Nearly $10-Million Grant 2U.S. Dept. of Labor Awards SIUE Nearly $10-Million Grant 3U.S. Dept. of Labor Awards SIUE Nearly $10-Million Grant 4Ultrafast remote switching of light emission 2Blades of grass inspire advance in organic solar cells 2Blades of grass inspire advance in organic solar cells 3Shimadzu’s New Long-Travel Extensometer Increases Precision for Soft Material Testing 2
... In biological research laboratories, filtration techniques are performed to sterilize ... and separate and purify samples for processing. In most cases, ... The majority of filtration tasks ... 50 Torr (25 28Hg). A number of plastic labware ...
... , In this ... merits. A comprehensive examination of four Information Dependent Acquisition (IDA) survey ... found. A significant number of metabolites were found with each mode ... from glyburide. , Overview ...
... Purpose , ... Q TRAP LC/MS/MS system with Metabolite ID software for Phase I and ... productivity and confidence in your results. , ... Current trends in drug development are placing more emphasis on characterization of ...
Cached Biology Technology: Improving the Efficiency of Common Filtration Tasks in your Laboratory 2 Improving the Efficiency of Common Filtration Tasks in your Laboratory 3Strategies to Identify and Confirm Phase I Metabolites of Glyburide Using the 4000 Q TRAP System 2Strategies to Identify and Confirm Phase I Metabolites of Glyburide Using the 4000 Q TRAP System 3Strategies to Identify and Confirm Phase I Metabolites of Glyburide Using the 4000 Q TRAP System 4Strategies to Identify and Confirm Phase I Metabolites of Glyburide Using the 4000 Q TRAP System 5Strategies to Identify and Confirm Phase I Metabolites of Glyburide Using the 4000 Q TRAP System 6Identification of Phase I and Phase II Metabolites of Buspirone on the Q TRAP LC/MS/MS System 2Identification of Phase I and Phase II Metabolites of Buspirone on the Q TRAP LC/MS/MS System 3Identification of Phase I and Phase II Metabolites of Buspirone on the Q TRAP LC/MS/MS System 4Identification of Phase I and Phase II Metabolites of Buspirone on the Q TRAP LC/MS/MS System 5
Request Info...
Agarose-LE, 500 g. Suitable for soft agarose cloning. Nuclease-free.Gel point (1.5%): 36 1.5 C, EEO (-mr): 1200 g/cm2. Category: Nucleotides & Enzymes & Biochemicals, Ultrapure Biochemicals ....
Request Info...
Request Info...
Biology Products: