Navigation Links
Earth's crust was unstable in the Archean eon and dripped down into the mantle
Date:12/30/2013

collaborators at the US-American universities of Maryland, Southern California, and Yale have established that the mineral assemblages that formed at the base of a 45-kilometer-thick magnesium-rich crust were denser than the underlying mantle layer. In order to better explore the physics of this process, Professor Boris Kaus of the Geophysics work group at Mainz University developed new computer models that simulate the conditions when the Earth was still relatively young and take into account Johnson's calculations.

These geodynamic computer models show that the base of a magmatically over-thickened and magnesium-rich crust would have been gravitationally unstable at mantle temperatures greater than 1,500 to 1,550 degrees Celsius and this would have caused it to sink in a process called 'delamination'. The dense crust would have dripped down into the mantle, triggering a return flow of mantle material from the asthenosphere that would have melted to form new primary crust. Continued melting of over-thickened and dripping magnesium-rich crust, combined with fractionation of primary magmas, may have produced the hydrated magnesium-poor basalts necessary to provide a source of the tonalitetrondhjemitegranodiorite complexes. The dense residues of these processes, which would have a high content of mafic minerals, must now reside in the mantle.


'/>"/>

Contact: Dr. Tim E. Johnson
tjohnson@uni-mainz.de
49-613-139-26825
Johannes Gutenberg Universitaet Mainz
Source:Eurekalert

Page: 1 2

Related biology news :

1. Research unearths new dinosaur species
2. Geosphere features top geoscience technology, including LiDAR, EarthScope, CHIRP, ALSM, and IODP
3. Chapman University unearths data in animal habitat selection that counters current convention
4. Rare earths in bacteria
5. Unexpected crustacean diversity discovered in northern freshwater ecosystems
6. A minute crustacean invades the red swamp crayfish
7. An ocean away: 2 new encrusting anemones found in unexpected locations
8. The discovery of a new genus of crustacean and 5 new species
9. Fossil record shows crustaceans vulnerable as modern coral reefs decline
10. Magma in Earths mantle forms deeper than once thought
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/1/2015)... Apr. 1, 2015  NXT-ID, Inc. (NASDAQ: NXTD ... focused on the growing mobile commerce market, announces the ... wallets is underway to early access pre-order customers. ... usage at retail outlets including Walmart, Target, AT&T, Dunkin, ... Wocket was accepted at all outlets and very easy ...
(Date:3/31/2015)... , March 31, 2015   Guidepoint , ... launch of the Post-Surgical Pain Management TRACKER, part of ... tracking usage trends in the medical device and therapeutics ... to data including treatment volumes, market share, and adoption ... pain associated with joint surgery. The Post-Surgical ...
(Date:3/24/2015)... 24, 2015 Research and Markets ( ... "Global Iris Recognition Market 2015-2019" report to their ... Recognition market to grow at a CAGR of 23.5 ... covers the present scenario and the growth prospects of ... To calculate the market size, the report considers the ...
Breaking Biology News(10 mins):NXT-ID Reports Second Shipment of Wocket Smart Wallets Underway to Early Access Pre-order Customers and Provides User Feedback 2NXT-ID Reports Second Shipment of Wocket Smart Wallets Underway to Early Access Pre-order Customers and Provides User Feedback 3NXT-ID Reports Second Shipment of Wocket Smart Wallets Underway to Early Access Pre-order Customers and Provides User Feedback 4Guidepoint Launches Post-Surgical Pain Management TRACKER 2Guidepoint Launches Post-Surgical Pain Management TRACKER 3Global Iris Recognition Market 2015-2019 with 3M Cogent, Bioenable Technologies, Cross Match Technology, Iris ID Systems & Safran Dominating 2
... the next big innovation in sustainable climate technology? ... for Business Law and Regulation at Case Western Reserve ... do just that. "Technology-induced prizes have a long ... on a Climate Prize Rewarding Energy Innovation to Achieve ...
... ST. AUGUSTINE, TRINIDAD AND TOBAGOFlower color in plants ... carotenoids. Research has found that the ultimate color displayed ... also on other factors, including cell shape, presence of ... role of pH in creating color has allowed plant ...
... Ill. Researchers have identified a protein long known to ... growth. Their study, in the journal Oncogene , is ... accomplishes this feat. "People suggested that Runx3 might be ... it is down-regulated in a lot of breast cancer cell ...
Cached Biology News:CWRU law professor eyes prize-based incentives to generate climate innovation 2Engineering blue-hued flowers 2Team identifies new breast cancer tumor suppressor and how it works 2
(Date:4/21/2015)... CAMBRIDGE, Mass. , April 21, 2015 ... clinical data from a multi-arm Phase 1 study of ... data were presented in an oral session by Dr. ... Association for Cancer Research Annual Meeting in ... and tolerability of MM-141 as a monotherapy and in ...
(Date:4/21/2015)... 2015 Ampio Pharmaceuticals, Inc. (NYSE MKT: AMPE) ... on Thursday, April 23, 4:30 p.m. ET. Participants are ... Investor call information: U.S./ ... toll number: (925) 418-7845 Participant Passcode: 32888538 ... Amirkiai , tina.amirkiai@fleishman.com . Access will ...
(Date:4/21/2015)... Calif. , April 21, 2015 /PRNewswire/ ... provider of advanced cryogenic logistics solutions for ... immunotherapies, stem cells, cell lines, clinical research ... announced that Dr. Mark W. Sawicki ... the 3rd Annual BioLogistics Summit in ...
(Date:4/21/2015)... Mass. , April 21, 2015 /PRNewswire/ ... developing transformative pharmaceutical products for subcutaneous delivery, ... pivotal trial of its investigational proprietary drug ... of edema associated with congestive heart failure. ... scPharmaceuticals is developing a proprietary patch pump.  ...
Breaking Biology Technology:First-in-Human Phase 1 Trial of MM-141 Demonstrates Activity in Biomarker Positive Patients 2First-in-Human Phase 1 Trial of MM-141 Demonstrates Activity in Biomarker Positive Patients 3First-in-Human Phase 1 Trial of MM-141 Demonstrates Activity in Biomarker Positive Patients 4First-in-Human Phase 1 Trial of MM-141 Demonstrates Activity in Biomarker Positive Patients 5Ampio Announces Investor Call on Thursday, April 23, 4:30 p.m. ET 2Cryoport to Present at the 3rd Annual BioLogistics Summit in San Francisco, CA 2Cryoport to Present at the 3rd Annual BioLogistics Summit in San Francisco, CA 3scPharmaceuticals Announces Start of Pivotal Trial for Novel Furosemide Solution for Subcutaneous Delivery 2scPharmaceuticals Announces Start of Pivotal Trial for Novel Furosemide Solution for Subcutaneous Delivery 3
... ET; 8:00 a.m. PT, VANCOUVER and SAN DIEGO, ... a clinical-stage developer of drugs for infectious,diseases, will host ... at 11:00 a.m. ET (8:00 a.m. PT) to discuss ... 2008 and provide an update on,company activities. To participate ...
... on Detroit Area, DETROIT, March 11 ... its new study, Affordable Broadband:,Empowering Communities Across the ... to education, health care and civic,involvement in minority ... Empowerment Council (DEC) that was launched,earlier this year ...
... March 11 Haemonetics,Corporation announced today the appointment ... Chief Marketing Officer. In this position, Mr. Allen,will ... portfolio in addition to his current responsibilities as ... commented, "Pete Allen was an,architect of our strategic ...
Cached Biology Technology:Study Finds Broadband Access Key to Empowerment of Minority Communities 2Haemonetics(R) Appoints Peter Allen as Chief Marketing Officer 2
... ( Abpromise for all tested ... Synthetic peptide derived from within residues ... MSY2/YBOX2. (Note: the amino acid ... (Peptide available as ab27460 .) ...
Request Info...
Molecular Biology grade. Ideally suited for DNA and RNA separation and recovery. High gel strength. Gelling temp. 36C. Melting temp. 88C. EEO: 0.05-0.13 Resolution 0.2-40 kb; Rnase/Dnase: none detec...
... Signet offers the most comprehensive, ... requirements. We have incorporated unprecedented quality ... capabilities. This includes proven detection chemistries ... to the TechMate protocol. It also ...
Biology Products: