Navigation Links
Poisonous oceans delayed animal evolution
Date:10/24/2011

"We have investigated the cycling of molybdenum (Mo) in ancient oceans by studying the elemental and isotopic composition of Mo in sedimentary rocks from Grand Canyon that formed in the oceans 750 million years ago", explains Tais W. Dahl, who did this research in collaboration with researchers from Arizona State University, Harvard University and the Nordic Center of Earth Evolution in Denmark (NordCEE).

Molybdenum tracks the presence of poisonous sulfide in ancient oceans

The study uses a new method to determine the extent of anoxia and presence of sulfide in the world oceans. Geochemical analyses of the trace element, molybdenum, in 750 million year-old rocks from Grand Canyon suggest oceans contained enormous amounts of lethal sulfide.

Molybdenum is relatively rich in today's seawater, because it is soluble in water in the presence of O2, and therefore it accumulates in modern oxygenated oceans. Conversely, molybdenum becomes insoluble in anoxic waters where sulfide is present, so it precipitates out of the oceans. The new results show that oceans contained less Mo in the past, because sulfide-rich waters extended over much greater areas than today.

Vast areas of animal-inhospitable seafloor

Today, oceans are nearly fully oxygenated and sulfide is only present in restricted areas of the ocean, such as the deepest parts of the Black Sea and the Baltic Sea. According to a hypothesis established by Donald Canfield (NordCEE) in 1998 sulfide was a much more common constituent in the oceans 1900-750 million years ago.

The new study is first to quantify the expansion of sulfide in the 'Canfield-ocean'. Model calculations for the oceanic molybdenum cycle suggest that 10-50% of the shallow oceans were covered with sulfidic waters. This is 400-800 times more than in today's oceans. The vast areas of poisonous seafloor would have made oceans inhospitable for animals. Expansive anoxic and poisonous oceans are now held responsible for the late appearance of animal life forms on Earth.
'/>"/>

Contact: Tais W. Dahl, PhD., Geochemistry
tdahl@biology.sdu.dk
456-550-2795
University of Southern Denmark
Source:Eurekalert  

Related biology news :

1. Natural pain relief from poisonous shrub
2. Poisonous tears
3. Poisonous prehistoric raptor discovered by research team from Kansas and China
4. Poisonous Poisson
5. 3-D microscope opens eyes to prehistoric oceans and present-day resources
6. Acidifying oceans could hit California mussels, a key species
7. The Atlas of Coasts and Oceans
8. Office of Naval Research engages international partners at OCEANS 2011
9. Significant role of oceans in onset of ancient global cooling
10. UGA scientists discover missing links in the biology of cloud formation over the oceans
11. How do you manage US oceans? Look at local successes
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Poisonous oceans delayed animal evolution
(Date:1/28/2016)... JOSE, Calif., Jan. 28, 2016 Synaptics (NASDAQ: SYNA ... results for its second quarter ended December 31, 2015. ... second quarter of fiscal 2016 increased 2 percent compared to the ... second quarter of fiscal 2016 was $35.0 million, or $0.93 per ... Non-GAAP net income for the first quarter of fiscal 2016 grew ...
(Date:1/22/2016)... January 22, 2016 ... addition of the  "Global Behavioral Biometric ... --> http://www.researchandmarkets.com/research/4lmf2s/global_behavioral ) has ... Behavioral Biometric Market 2016-2020"  report to ... and Markets ( http://www.researchandmarkets.com/research/4lmf2s/global_behavioral ) has announced ...
(Date:1/20/2016)...   MedNet Solutions , an innovative SaaS-based eClinical ... research, is pleased to announce the attainment of record-setting ... result of the company,s laser focus on (and growing ... it,s comprehensive, easy-to-use and highly affordable cloud-based technology platform. ... MedNet growth achievements in 2015 include: , ...
Breaking Biology News(10 mins):
(Date:2/5/2016)... 5, 2016 Australian-US drug discovery and development company, ... appointment of a new Chairman, Mr John O,Connor , ... immediately. James Garner , has also been ... former Acting CEO, Mr Iain Ross , will resume ... --> James Garner , has also been formally appointed ...
(Date:2/4/2016)... , Feb. 4, 2016  Sangamo BioSciences, Inc. (NASDAQ: ... announced today that Edward Lanphier , Sangamo,s president ... the progress of Sangamo,s ZFP Therapeutic ® development ... at 2:40 pm ET on Thursday, February 11, 2016, ... Healthcare Conference. The conference is being held in ...
(Date:2/4/2016)... -- Beike Biotechnology, the Shenzhen ... in late 2015 to mark their successful combined efforts ... --> --> The signing, ... Therapy" was hosted by the Shenzhen Cell Bank and ... Beike Biotechnology Co., Ltd. Shenzhen,s ...
(Date:2/4/2016)... February 4, 2016 --> ... acceleration company is pleased to provide the following update on ... Over the last 3 months we have significantly increased ... agreements exceeding $1,000,000. As a result, we have positioned ourselves ... Inc. license agreement and expect that development to continue on ...
Breaking Biology Technology: