Navigation Links
December Geosphere media highlights
Date:12/1/2008

Boulder, CO, USA The December Geosphere, The Geological Society of America's e-journal, is now online. Topics include detailed data integration from multiple fields, including tectonics, oceanography, sedimentology, and paleontology, to study the southwestern U.S. climate 17 million years ago to 6 million years ago; sedimentation in a piggyback basin; Angel Lake orthogneiss in the East Humboldt Range, Nevada; and a study of the South Balkan extensional system within southern Bulgaria, Macedonia, eastern Albania, northern Greece, and northwestern Turkey.

Highlights are provided below. Representatives of the media may obtain complimentary copies of articles by contacting Christa Stratton at cstratton@geosociety.org. Please discuss articles of interest with the authors before publishing stories on their work, and please make reference to GEOSPHERE in articles published. Contact Christa Stratton for additional information or other assistance.

Non-media requests for articles may be directed to GSA Sales and Service, gsaservice@geosociety.org.


Interplay of oceanographic and paleoclimate events with tectonism during middle to late Miocene sedimentation across the southwestern USA

Charles E. Chapin, New Mexico Bureau of Geology and Mineral Resources, New Mexico Institute of Mining and Technology, Socorro, New Mexico 87801, USA.

This paper uses sedimentation and erosion history as proxy for changes in the climate of the southwestern USA during the middle and late Miocene (ca. 17 Ma). The continental sedimentary record was compiled along a 2000-km transect from coastal California to the western Great Plains and correlated with the coeval marine Monterey Formation. Integration of data from the fields of plate tectonics, oceanography, sedimentology, paleoclimatology, and paleontology were used to interpret the causes and effects of major changes in the continental and marine sedimentary records. Two major changes in climate were interpreted: (1) a multiphase climate transition (ca. 17 Ma) caused mainly by changes in ocean circulation due to opening and closing of seaways connecting ocean basins and growth of the East Antarctic Ice Sheetthese climate changes were from warmer and wetter to cooler and drier; and (2) intensification of the North American monsoon caused by opening of the Gulf of California at ca. 6 Ma. A dramatic increase in summer thunderstorm activity resulted in integration of drainages, termination of closed-basin sedimentation, incision of uplifts, and exhumation of basin-fill sedimentary deposits. Such changes are usually interpreted as resulting from tectonic uplift; however, the complex interplay of tectonics and climate, rather than one or the other, was responsible for the Miocene changes in the southwestern United States.


Evolution and dynamics of the Cenozoic tectonics of the South Balkan extensional system

B.C. Burchfiel et al., Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 01239, USA. The work reported in this paper received NSF funding.

This paper discusses the tectonic evolution of the Southern Balkan extensional system from its beginning as an Andean margin from Late Cretaceous to early Eocene, through a transition from Andean to extension settings from middle Eocene to Oligocene time, to a regional extensional setting from the early Miocene to present. The regional tectonic setting begins as part of the Aegean extensional system but evolves into a system that is largely decoupled from the Aegean system as the North Anatolian fault develops from Late Miocene to Recent time. Late Cenozoic extension within the South Balkan extensional system is strongly diachronous, with north-south and east-west normal faulting that migrates in tandem from east to west, respectively, an expression of slab differential roll back along northern and southern parts of the Hellenic subduction zone. Extension in the Hellenic orogen was accompanied by late Cenozoic clockwise rotation of up to 50 degrees. The South Balkan extensional system is an example of the complex temporal and spatial relations between geometry, kinematics, and dynamics of lithospheric structure during the Cenozoic evolution of Mediterranean backarc extensional regions.


'/>"/>

Contact: Christa Stratton
cstratton@geosociety.org
303-357-1093
Geological Society of America
Source:Eurekalert

Related biology news :

1. News from the December 2008 Journal of the American Dietetic Association
2. BioScience tip sheet, December 2008
3. December 2008 Geology and GSA Today media highlights
4. December 2008 highlights from Biology of Reproduction
5. Emerging field of neuroecology is showcased in December issue of the Biological Bulletin
6. Story tips from the Department of Energys Oak Ridge National Laboratory, December 2007
7. Highlights from the December 2007 Journal of the American Dietetic Association
8. December GEOLOGY and GSA TODAY media highlights
9. June GEOSPHERE media highlights
10. Mediator in communication between neurons and muscle cells found
11. October 2008 GEOLOGY and GSA TODAY media highlights
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/15/2017)... --  ivWatch LLC , a medical device company focused on improving ... of its ISO 13485 Certification, the global standard for medical device ... (ISO®). ... Monitoring device for the early detection of IV infiltrations. ... "This is an important milestone for ivWatch, as it ...
(Date:6/14/2017)... (NYSE: IBM ) is introducing several innovative partner startups ... collaboration between startups and global businesses, taking place in ... nine startups will showcase the solutions they have built with ... France is one of the ... percent increase in the number of startups created between 2012 ...
(Date:5/6/2017)... SINGAPORE , May 5, 2017 ... has just announced a new breakthrough in biometric ... that exploits quantum mechanical properties to perform ... new smart semiconductor material created by Ram Group ... across finance, entertainment, transportation, supply chains and security. ...
Breaking Biology News(10 mins):
(Date:10/10/2017)... ... October 10, 2017 , ... USDM Life Sciences , ... life sciences and healthcare industries, announces a presentation by Subbu Viswanathan and Jennifer ... “Automating GxP Validation for Agile Cloud Platforms,” will present a revolutionary approach to ...
(Date:10/9/2017)... ... ... The award-winning American Farmer television series will feature 3 Bar Biologics in an ... on RFD-TV. , With global population estimates nearing ten billion people by 2050, ... a growing nation. At the same time, many of our valuable resources are becoming ...
(Date:10/9/2017)... ... October 09, 2017 , ... ... 5, 2017, in the medical journal, Epilepsia, Brain Sentinel’s SPEAC® System which ... video EEG, in detecting generalized tonic-clonic seizures (GTCS) using surface electromyography (sEMG). ...
(Date:10/7/2017)... 6, 2017  The 2017 Nobel Prize in ... Jacques Dubochet, Joachim Frank and ... cryo-electron microscopy (cryo-EM) have helped to broaden ... biology community. The winners worked with systems manufactured ... produce highly resolved, three-dimensional images of protein structures ...
Breaking Biology Technology: