Navigation Links
Contacts, collisions, sutures, belts, and margins -- new GSA Bulletin content
Date:4/9/2013

of crustal recycling in the construction of the modern day Andean margin. The lithological character of the xenoliths and their detrital zircon ages are inconsistent with current understanding of the eastern extent of the Arequipa-Antofalla Basement block beneath the Bolivian Altiplano and instead indicate that it terminates farther to the west than previously assumed.


Crustal fracturing and chert dike formation triggered by large meteorite impacts, ca. 3.260 Ga, Barberton greenstone belt, South Africa
Donald R. Lowe, Dept. of Geological and Environmental Sciences, 118 Braun Hall, Stanford University, Stanford, California 94305-2115, USA. Posted online 7 March 2013; http://dx.doi.org/10.1130/B30782.1.

The approx. 3260 million-year-old contact between the largely volcanic Onverwacht Group and overlying largely sedimentary Fig Tree Group in the Barberton greenstone belt, South Africa, is widely marked by chert dikes that extend downward for up to 100 m into underlying sedimentary and volcanic rocks of the Mendon Formation (Onverwacht Group). In the Barite Valley area, these dikes formed as open fractures that were filled by both precipitative fill and the downward flowage of liquefied carbonaceous sediments and ash at the top of the Mendon Formation. Spherules that formed during a large meteorite or asteroid impact event occur in a wave- and/or current-deposited unit, spherule bed S2, which widely marks the Onverwacht-Fig Tree contact, and as loose grains and masses within some chert dikes up to 50 m below the contact. Four main types of chert dikes and veins are recognized: (Type 1) irregular dikes up to 8 m wide that extend downward across as much as 100 m of stratigraphy; (Type 2) small vertical dikes, most less than one m wide, which are restricted to the lower half of the Mendon chert section; (Type 3) small crosscutting veins, most less than 50 cm across, filled
'/>"/>

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

Page: 1 2 3 4 5 6 7 8 9

Related biology news :

1. GSA Bulletin presents studies in Antarctica, Italy, Mexico, Algeria, Mongolia, and more
2. Summer Geoscience from GSA Bulletin
3. Medbox Communicates with Shareholders, Comments on Pending Transition to OTC Bulletin Board, and Announces Appearance on Fox Business News Channel
4. GSA Bulletin: From Titan to Tibet
5. GSA Bulletin celebrates GSAs 125th Anniversary with new geologic time scale
6. GSA Bulletin starts 2013 with 13 new papers published online ahead of print
7. Kauai, the Petrified Forest, Costa Rica, and more: New GSA Bulletin articles now online
8. Researchers say tart cherries have the highest anti-inflammatory content of any food
9. International Life Sciences Conferences Address Advancements in High-Content Analysis, Sample Preparation, Clinical Trial Supply and Protein and Antibody Engineering
10. JCI early table of contents for Mar. 15, 2013
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/30/2015)... , June 30, 2015 Genisphere ... as CEO to help further develop Genisphere,s therapeutics capabilities ... partnering experience, having spent much of the last 25 ... Amgen, Baxter Bioscience, and Johnson & Johnson. Tom started ... Technology and Biotech Corporate Finance. He graduated from Dartmouth ...
(Date:6/25/2015)... June 25, 2015  TAKE Solutions Ltd., a global ... the United States Patent and Trademark Office (USPTO) for ... leverages TAKE Solutions, Clinical Accelerators to reduce the time ... compared to standardization without the accelerators), thus reducing time ... At the heart of the patented Clinical ...
(Date:6/24/2015)... , June 24, 2015 Biometry authentication ... emerging biometric password solution one face in. ... one face in, entering the expanding ... and affordable multifactor-authentication biometric answer to the password ... provided in partnership with KeyLemon, one face in ...
Breaking Biology News(10 mins):Genisphere Appoints New CEO, Thomas Bliss 2Genisphere Appoints New CEO, Thomas Bliss 3TAKE Solutions Awarded Patent By USPTO 2KeyLemon Announces Partnership With Biometric Password Solution onefacein 2
... University of Leicester and University of California Los Angeles ... ,bad, cholesterol in the body. They have filed ... as a catalyst for lowering levels of ,bad, cholesterol. ... the understanding of the regulation of low-density lipoprotein (LDL) ...
... SAN ANTONIO A large, multicenter, randomized study has ... larger tumors, increased lymph node involvement and, when not ... This is the first time the relationship ... according to Jennifer A. Crozier, M.D., a medical resident ...
... LA JOLLA, CA ---- Researchers at the Salk Institute for ... cells to potentially cure sickle cell disease and many other ... blood hemoglobin. The technique uses cells from a patient,s ... capable of developing into various types of mature tissues -- ...
Cached Biology News:New advance announced in reducing 'bad' cholesterol 2Addition of trastuzumab may potentially equalize disease-free survival outcomes among obese and normal-weight patients 2Salk researchers develop safe way to repair sickle cell disease genes 2Salk researchers develop safe way to repair sickle cell disease genes 3Salk researchers develop safe way to repair sickle cell disease genes 4
(Date:7/1/2015)... (PRWEB) , ... July 01, 2015 , ... ... sterilized to combat pathogen transmission. CTI’ new Medical Joysticks have an impermeable ... devices now have an operator control device that will increase healthcare worker safety ...
(Date:6/30/2015)... ... June 30, 2015 , ... Park Systems ... advanced scientific research into new classes of Nanoscale Graphene-based materials poised to revolutionize ... 'the wonder material of the 21st Century' by the researchers who were awarded ...
(Date:6/30/2015)... ... 2015 , ... With its latest polyacrylonitrile (PAN) membrane, Sterlitech ... flow rates in comparison to nylon or polyethersulfone (PES). Its unique nanofiber ... liquid flow while trapping particulates as small as 0.2 micron in width. , ...
(Date:6/30/2015)... , June 30, 2015  Custom Computer Specialists, ... today that they are silver sponsors of the Primary ... PCDC sponsor, Custom is lending their support of PCDC,s ... communities. Since its founding in 1993, PCDC ... primary care area.  PCDC has financed over 100 completed ...
Breaking Biology Technology:Sanitized Medical Joysticks for a Safer and Healthier Work Environment 2How Graphene–based Nanomaterials and Films Revolutionize Science Explained in July 9 Webinar Hosted by Park Systems 2How Graphene–based Nanomaterials and Films Revolutionize Science Explained in July 9 Webinar Hosted by Park Systems 3How Graphene–based Nanomaterials and Films Revolutionize Science Explained in July 9 Webinar Hosted by Park Systems 4New Nanofiber Membrane Provides Fast, Efficient Filtration 2Custom Computer Specialists Announces Sponsorship Of The Primary Care Development Corporation's Corporate Circle 2
... Madison, Wis. - A Madison company will participate newly ... NimbleGen Systems Inc., will participate in the research ... approved for a National Cancer Institute grant that ... work with the University California, San Diego (UCSD) ...
... ARI Network Services, Inc., a provider of electronic parts ... Wednesday reported increased revenues and record net income for the ... fiscal 2005 were $13.7 million, a 2% increase from revenues ... to $2.1 million or $0.32 per diluted share, from operating ...
... Inc. has filed suit against three companies, seeking rulings ... on Tuesday. The suits were filed in federal court in ... Digene Corp., seeking a court ruling supporting Third Wave's ... ,On Tuesday, Third Wave filed suit against Chiron Corp. ...
Cached Biology Technology:NimbleGen to be part of new cancer study 2Third Wave files patent suits against Digene, Chiron and Bayer 2
Blank Calibration Particles, 3.0-3.4 mu m 5 ml...
Goat polyclonal to SIAH Interacting Protein ( Abpromise for all tested applications)....
Rabbit polyclonal to Phosphothreonine-X-Phosphotyrosine (HRP) ( Abpromise for all tested applications)....
Rat integrin a6b1, mainly associated with epithelial cells. Does not react with rat fibroblasts....
Biology Products: