Navigation Links
GSA Bulletin: From Titan to Tibet
Date:11/27/2012

nt flows with time resulting in a complex basin fill. The seafloor was dominated by very coarse-grained sediments -- some as large as houses -- that were sourced from steep slopes, a multitude of rivers, and small deltas. In comparison with other submarine rift-margin-basins globally, Strachan and colleagues found little commonality in vertical sedimentary trends -- a testament to the wide variety of sub-environments and flow processes, and their response to coeval tectonic and paleoclimatic events


The continental record and the generation of continental crust
P.A. Cawood et al., Dept. of Earth Sciences, University of St. Andrews, North Street, St. Andrews KY16 9AL, UK. Posted online 31 October 2012; http://dx.doi.org/10.1130/B30722.1.

Continental crust is the archive of Earth's history. It is characterized by peaks of crystallization ages are that linked to the timing of the assembly of supercontinents. These peaks of ages reflect a tectonic bias because igneous and metamorphic rocks generated in late stage convergence and collision zones are most likely to be preserved, rather than fundamental pulses of magmatic activity. New analysis of the isotope ratios in the mineral zircon, which occurs as fragments in sedimentary rocks, suggests that at least ~60%-70% of the present volume of the continental crust had been generated by three billion years ago. These data show that growth of continental crust was continuous rather than episodic, and there was a marked decrease in the rate of crustal growth at about three billion years ago that may have been linked to the onset of significant crustal recycling, probably though subduction at convergent plate margins. The 60%-70% of the present volume of the continental crust estimated to have been present three billion years ago, contrasts markedly with less than 10% of crust of that age apparently still preserved. Large
'/>"/>

Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert  

Page: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

Related biology news :

1. U of M study finds titan cells protect Cryptococcus
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
GSA Bulletin: From Titan to Tibet
(Date:4/24/2014)... Have you ever accidently missed a red light or ... a visible event that you passed by but totally ... for our attention, we can only be aware of ... Beckman Institute Postdoctoral Fellow at the University of Illinois. ... concentrating on obeying traffic signals." , But say there,s ...
(Date:4/24/2014)... attack plants, they often inject harmful proteins into ... natural defenses. However, in some plants, bacteria attack ... potential host. Now, researchers at the University of ... allows the bacteriaknown mostly for attacking tomatoesto invade ... anti-infective treatments that work with food-producing plants to ...
(Date:4/24/2014)... Alison Allan, PhD, a scientist at Western University and ... often spreads or metastasizes to the lung. , Breast ... number two cause of cancer-related deaths among women in ... radiation have a high success rate, but once the ... In particular, the lung is one of the most ...
Breaking Biology News(10 mins):Controlling brain waves to improve vision 2Controlling brain waves to improve vision 3Plants send out signals attracting harmful bacteria, MU study finds 2New study helps to explain why breast cancer often spreads to the lung 2
... The American Association for Cancer Research will host its ... Disparities from Sept. 18-21, 2011, in the Grand Hyatt ... will bring together scientists, survivors, doctors and others to ... treatment methods to better meet the needs of underserved ...
... have employed pheromone-baited bucket traps, canines to sniff out ... to eradicate the coconut rhinoceros beetle (CRB) on Guam ... to these tactics. USDA has given Guam an infusion ... rhino beetle population on island. Aubrey Moore, entomologist and ...
... of American Societies for Experimental Biology (FASEB) announced today ... (HCS). The executive leadership has retained FASEB to ... membership marketing, recruitment, and retention, as well as a ... William Stahl, PhD commented, "HCS is pleased to have ...
Cached Biology News:AACR to host conference on the science of cancer health disparities 2
(Date:1/15/2014)... The Microcompetition with Foreign DNA theory explains how latent viruses ... is the Epstein Barr Virus (EBV), and one of these ... chronic inflammatory disease that destroys the body’s joints. As predicted ... high concentrations of EBV DNA in their bodies (1). ...
(Date:1/15/2014)... 2014 AudioNotch is the internet's leading ... the treatment of tinnitus. Patients listen to sound therapy ... a period of weeks to months, their tinnitus volume decreases. ... forms: Notched Music and Notched White Noise. Now, AudioNotch is ...
(Date:1/14/2014)... 14, 2014 Histogen, Inc., a regenerative ... cells grown under simulated embryonic conditions, today announced that ... Suneva Medical, Inc. for physician-dispensed aesthetic products containing Histogen’s ... This agreement is an amendment to the existing license ...
(Date:1/14/2014)... Jan. 14, 2014 The largest international professional ... plants and therapeutic derivatives thereof has endorsed an ... researchers about the challenges of adulterated herb and ... The Society for Medicinal Plant ...
Breaking Biology Technology:Study: Rheumatoid Arthritis (RA) Patients Have EBV; The CBCD Says this is Consistent with Microcompetition 2Study: Rheumatoid Arthritis (RA) Patients Have EBV; The CBCD Says this is Consistent with Microcompetition 3Histogen and Suneva Medical Expand License for Cell Conditioned Media-based Aesthetic Products Internationally 2Histogen and Suneva Medical Expand License for Cell Conditioned Media-based Aesthetic Products Internationally 3World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 2World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 3World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 4World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 5World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 6World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 7World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 8
... to Date Examined 175,000 Teenage Girls and Adult ... before motherhood,more than doubled in six years among ... study published in the May issue of Diabetes ... looked exclusively at gestational diabetes,(diabetes that develops during ...
... N.J., April 25 Osteotech, Inc.,(Nasdaq: OSTE ), ... for,regenerative medicine, announced today that the United States Food ... the Plexur,P(TM) Biocomposite for use in spinal applications as ... Previously, Osteotech received FDA clearance for,Plexur P(TM) for use ...
... Inc. (Amex: IMA ), a leading manufacturer ... and professional markets, announced,today that it will attend ... held April 30 - May 2, 2008, at ... Executive Officer, will,attend. His presentation is scheduled for ...
Cached Biology Technology:Kaiser Permanente Study Finds Diabetes Doubling Before Motherhood 2Kaiser Permanente Study Finds Diabetes Doubling Before Motherhood 3Kaiser Permanente Study Finds Diabetes Doubling Before Motherhood 4Osteotech's Plexur P(TM) Receives FDA Clearance as Bone Void Filler and Bone Graft Extender in Spine 2Osteotech's Plexur P(TM) Receives FDA Clearance as Bone Void Filler and Bone Graft Extender in Spine 3