Navigation Links
Sierra Nevada rose to current height earlier than thought, say Stanford geologists
Date:4/23/2008

the Pacific Ocean as it blew onto the continent and crossed the Sierra Nevada. As the air gains elevation, it cools, moisture concentrates and condenses, and it rains. Water containing heavier isotopes of hydrogen tends to fall first, resulting in a systematic decrease in the ratio of heavy water molecules to lighter ones in the remaining water vapor.

Because so much of the airborne moisture falls as rain on the windward side of the mountains, land on the leeward side gets far less rain - an effect called a "rain shadow" - which often produces a desert.

The higher the mountain, the more pronounced the rain shadow effect is and the greater the decrease in the number of heavy hydrogen isotopes in the water that makes it across the mountains and falls on the leeward side of the range. By determining the ratio of heavier to lighter hydrogen isotopes preserved in volcanic glass and comparing it with today's topography and rainwater, researchers can estimate the elevation of the mountains at the time the ancient water crossed them.

Volcanic glass is an excellent material for preserving ancient rainfall. The glass forms during explosive eruptions, when tiny particles of molten rock are ejected into the air. "These glasses were little melt particles, and they cooled so rapidly when they were blown into the atmosphere that they just froze, basically," Mulch said. "They couldn't crystallize and form minerals."

Because glass has an amorphous structure, as opposed to the ordered crystalline structure of minerals, there are structural vacancies in the glass into which water can diffuse. Once the glass has been deposited on the surface of the Earth, rainwater, runoff and near-surface groundwater are all available to interact with it. Mulch said the diffusion process continues until the glass is effectively saturated with water.

Other researchers have shown that once such volcanic glass is fully hydrated, the water in it does not under
'/>"/>

Contact: Louis Bergeron
louisb3@stanford.edu
650-725-1944
Stanford University
Source:Eurekalert

Page: 1 2 3 4

Related biology news :

1. Simple screening questionnaire for kidney disease outperforms current clinical practice guidelines
2. New radar satellite technique sheds light on ocean current dynamics
3. Case researcher in RNA biology makes waves by challenging current thinking
4. Penn engineers create carbon nanopipettes that are smaller than cells and measure electric current
5. Recurrent genetic deletion linked to autism
6. Are current projections of climate change-impacts on biodiversity misleading?
7. Fossil data plugs gaps in current knowledge, study shows
8. A tall story: New research adds to growing body of knowledge of genetics of height
9. Satellites take sustainability to new heights
10. Study finds pitching mound height affects throwing motion, injury risk
11. Researchers uncover new piece to the puzzle of human height
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:12/17/2014)... Dec. 15, 2014  HITLAB SM announced today its ... confirm its adherence to current U.S. Food and Drug ... regulated smart device and smart phone application trials utilizing ... "HITLAB is determined to improve global healthcare ...
(Date:12/11/2014)... Research and Markets , ... announced the addition of the "Biometrics Market in ... One major trend emerging in this market ... it is important to upgrade biometric solutions to the ...
(Date:12/10/2014)... Dec. 9, 2014  Valencell, a leader in performance biometric ... staggering demand from its licensees for highly accurate, clinically ... not solely coming from fitness and health sectors, but ... "A wearable is only as useful as the biometric ...
Breaking Biology News(10 mins):HITLAB Completes GCP Audit for FDA Smart Device & App Compliance 2Biometrics Market in the APAC Region 2015-2019: Key Vendors are 3M Cogent, NEC, Safran and Suprema 2Wearable Technology Products Demand Highly Accurate Biometric Technology 2
... system that can form and stabilize a functional network ... the body, according to a report in the Proceedings ... body tissue to survive it must receive oxygen delivered ... Lavik, assistant professor of Biomedical Engineering, this study shows ...
... protective system goes into action in some cases when ... a hidden safety net that might have far-reaching consequences ... AIDS. The Mayo Clinic-led study was conducted with colleagues ... early online edition of the Feb. 1 Journal of ...
... hip and knee implants and biomedical devices such as ... reduce health care costs and improve quality of life ... have found. , A significant number of hip and ... in many cases are not amenable to treatment with ...
Cached Biology News:Bioengineers create stable networks of blood vessels 2Infant transplant patients resist infections that kill adult AIDS patients 2Infant transplant patients resist infections that kill adult AIDS patients 3Antibacterial coatings cut infection rates 2Antibacterial coatings cut infection rates 3
(Date:1/22/2015)... (PRWEB) January 22, 2015 Selexis SA, ... mammalian Research Cell Banks (RCBs) used for drug discovery ... Cell Banks will include Next-Generation Sequencing (NGS) ... architecture de-risks biologic manufacturing by ensuring the integrity of ...
(Date:1/22/2015)... , Jan. 22. 2015  Varian Medical Systems (NYSE: ... has been honored for its commitment to sustainability with inclusion ... Varian is the highest ranked healthcare equipment company among the ... during the World Economic Forum at Davos, Switzerland ...
(Date:12/24/2014)...  United Therapeutics Corporation (NASDAQ: UTHR ) announced ... has submitted a pre-market approval application to the U.S. ... Medtronic,s SynchroMed ® II implantable drug infusion system ... Therapeutics, Remodulin ® (treprostinil) Injection delivered intravenously to ...
(Date:12/24/2014)... “Preparative & Process Chromatography Market by ... Solvents, Buffers, Valves, Guages, Seals), Accessories, Services, End ... to 2019” provides a detailed overview of the ... and strategies impacting the preparative and process chromatography ...
Breaking Biology Technology:Selexis Generated Research Cell Banks Now Fully Sequenced Using Next-Generation Sequencing 2Varian Honored Among World's 100 Most Sustainable Corporations 2United Therapeutics Announces Submission Of Pre-Market Approval Application For Implantable Drug Infusion System To Deliver Remodulin 2United Therapeutics Announces Submission Of Pre-Market Approval Application For Implantable Drug Infusion System To Deliver Remodulin 3United Therapeutics Announces Submission Of Pre-Market Approval Application For Implantable Drug Infusion System To Deliver Remodulin 4Preparative and Process Chromatography Market is expected to reach $9 billion by 2019 - New Report by Marketsandmarkets 2Preparative and Process Chromatography Market is expected to reach $9 billion by 2019 - New Report by Marketsandmarkets 3Preparative and Process Chromatography Market is expected to reach $9 billion by 2019 - New Report by Marketsandmarkets 4
... in Gastroenterology Panel Discussion, ISELIN, N.J., Dec. 10 ... Chief Executive Officer Elkan R. Gamzu,Ph.D. will participate in ... Healthcare Conference taking place December 12,- 13, 2007 at ... York, New York.,The panel is entitled "Going With Your ...
... Dan Gold, Ph.D., Joins as Chief Executive Officer, ... Applied,Biology, Inc. (FAB), a privately held biotechnology company, ... financing. Prior investor SV Life,Sciences (SVLS) led the ... from the financing will be used to develop ...
... EXTON, Pa., Dec 7 Kensey Nash Corporation,(Nasdaq: ... discussion on,"Helping the Body Regenerate Bone & Tissue" at ... Evans, Kensey Nash,s COO, will participate in the panel,discussion ... The Westin New,York at Times Square in New York. ...
Cached Biology Technology:Pharmos Corporation to Present at the 2007 RBC Capital Markets Healthcare Conference 2Fundamental Applied Biology, Inc. Completes $21 Million Series B Financing 2Fundamental Applied Biology, Inc. Completes $21 Million Series B Financing 3
... This high pressure gradient system ... piston pumps, each providing a flow rate in ... dual wavelength detector for added flexibility. System ... data processing software and interface unit, CE 4900., ...
... The excellent isocratic refractive index chromatography system, uses ... CE 4700. Data processing is provided by ... is by the high pressure CE 4100 dual ... be supplied. The system can be ...
Narrow-mouth has heavy-duty rim. Approximate graduations are in durable white enamel. Extra large marking space. capacity 125 mL Special grade: student grade...
...
Biology Products: