Navigation Links
University of Miami scientist uncovers miscalculation in geological undersea record
Date:9/10/2008

VIRGINIA KEY, Fla. -- The precise timing of the origin of life on Earth and the changes in life during the past 4.5 billion years has been a subject of great controversy for the past century. The principal indicator of the amount of organic carbon produced by biological activity traditionally used is the ratio of the less abundant isotope of carbon, 13C, to the more abundant isotope, 12C. As plants preferentially incorporate 12C, during periods of high production of organic material the 13C/12C ratio of carbonate material becomes elevated. Using this principle, the history of organic material has been interpreted by geologists using the 13C/12C ratio of carbonates and organics, wherever these materials can be sampled and dated.

While this idea appears to be sound over the last 150 million years or so, prior to this time there are no open oceanic sediment records which record the 13C/12C ratio, and therefore, geologists are forced to use materials associated with carbonate platforms or epicontinental seas. In order to test whether platform-associated sediments are related to the global carbon cycle, a paper by University of Miami Professor Dr. Peter K. Swart appears in the Proceedings of the National Academy of Sciences. This paper examines changes over the past 10 million years at sites off the Bahamas (Atlantic Ocean), the Maldives (Indian Ocean), and Great Barrier Reef (Pacific Ocean). The variations in the 13C/12C ratio are synchronous at all of the sites studied, but are unrelated to the global change in the 13C/12C ratio.

It appears that records related to carbonate platforms which are often used throughout the early history of the Earth are not good recorders of the 13C/12C ratio in the open oceans. Hence, the work presented suggests that assumptions made previously about changes in the 13C/12C ratios of carbonate sediments in the geological record are incorrect.

"This study is a major step in terms of rethinking how geologists interpret variations in the 13C/12C ratio throughout Earth's history. If the approach does not work over the past 10 million years, then why would it work during older time periods?" said Swart. "As a consequence of our findings, changes in 13C/12C records need to be reevaluated, conclusions regarding changes in the reservoirs of carbon will have to be reassessed, and some of the widely-held ideas regarding the elevation of CO2 during specific periods of the Earth's geological history will have to be adjusted."


'/>"/>

Contact: Barbra Gonzalez
barbgo@rsmas.miami.edu
305-421-4704
University of Miami Rosenstiel School of Marine & Atmospheric Science
Source:Eurekalert

Related biology news :

1. A study by the MUHC and McGill University opens a new door to understanding cancer
2. University of Pennsylvania researchers develop formula to gauge risk of disease clusters
3. University of Oregon researcher finds that on waters surface, nitric acid is not so tough
4. Bioengineers at University of Pennsylvania devise nanoscale system to measure cellular forces
5. Binghamton University researchers investigate evolving malaria resistance
6. Antioxidant to retard wrinkles discovered by Hebrew University researcher
7. Society for General Microbiology 161st Meeting, University of Edinburgh
8. Boston University biomedical engineers find chink in bacterias armor
9. KAUST and American University in Cairo to collaborate on research and academic development
10. UNH becomes first university in nation to use landfill gas as primary energy source
11. University of Minnesota study refutes belief that black men have more aggressive prostate cancer
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/14/2016)... Allemagne, March 14, 2016 ... - --> - Renvoi : image disponible ... --> --> DERMALOG, ... fournit de nouveaux lecteurs d,empreintes digitales pour l,enregistrement ... DERMALOG sera utilisé pour produire des cartes d,identité ...
(Date:3/9/2016)... March 9, 2016 This BCC Research report ... of the RNA Sequencing (RNA Seq) market for the ... instruments, tools and reagents, data analysis, and services. ... of the RNA-Sequencing market such as RNA-Sequencing tools and ... main factors affecting each segment and forecast their market ...
(Date:3/3/2016)... 2016  2016FLEX, organized by FlexTech, a SEMI ... in flexible, hybrid and printed electronics. More than ... have gathered for short courses, technical session, exhibits, ... The Flex Conference celebrates its 15 th ... organizations, and universities contributing to the adoption of ...
Breaking Biology News(10 mins):
(Date:5/5/2016)... ... May 05, 2016 , ... American ... two additional patents, U.S. Patent Nos. 9,322,133 and 9,322,134, to API and its ... nanocellulose as well as hydrophobic nanocellulose compositions. In addition to these patents ...
(Date:5/4/2016)... ... May 04, 2016 , ... Proove Biosciences, Inc. , the commercial ... with McGill University . The partnership is designed to advance research in pain ... help patients in pain. With the new agreement, researchers at Proove Biosciences are able ...
(Date:5/4/2016)... (PRWEB) , ... May 04, 2016 , ... ... recent innovations in biotechnology to help treat hormonal and stress related hair loss. ... has captured the hearts of key opinion leaders in the medical and salon ...
(Date:5/3/2016)... ... 03, 2016 , ... Flagship Biosciences, the leader in ... Board of Directors. Dr. Gillett recently retired from Charles River Laboratories (CRL), where, ... Scientific Officer. A board-certified veterinary pathologist, Dr. Gillett joined Charles River in 1999 ...
Breaking Biology Technology: