Skip to main content
padlock icon - secure page this page is secure

Notes on the Black Mat Sediment, Mucuñuque Catchment, Northern Mérida Andes, Venezuela

Buy Article:

$105.00 + tax (Refund Policy)

The enigmatic black mat sediment complex in the northern Andes, previously considered the product of a high-grade lightning strike and low grade brush fire, has been upgraded recently to a conflagration resulting from incoming asteroid/comet impact over the Laurentide Ice Sheet at approximately 12.9 ka. Previous evidence from the black mat beds of disrupted quartz and orthoclase grains and intense firing from incoming C-rich ejecta is further supported by new SEM/EDS and FIB analyses of fine grain silt and clay spherules (10-∼2 μm dia.) of C, Fe and Mn composition, a mixed material of partly ejecta and partly country rock. Because the environment at the time of ejecta impact was in the initial stage of seral vegetative development as wet tundra, part of the clay/organic balls, classic 'house of cards' form, which constitute a portion of the sediment complex, may be of cosmic origin. Evidence of cyanobacteria and fungal filaments on and within grain coatings are probably post depositional and therefore of terrestrial origin.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics

Keywords: ASTEROID/COMET IMPACTS; BLACK MAT; YOUNGER DRYAS GLACIATION

Document Type: Research Article

Publication date: 01 August 2011

More about this publication?
  • Journal of Advanced Microscopy Research (JAMR) provides a forum for rapid dissemination of important developments in high-resolution microscopy techniques to image, characterize and analyze man-made and natural samples; to study physicochemical phenomena such as abrasion, adhesion, corrosion and friction; to perform micro and nanofabrication, lithography, patterning, micro and nanomanipulation; theory and modeling, as well as their applications in all areas of science, engineering, and medicine.
  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more