Abstracts - faqs.org

Abstracts

Earth sciences

Search abstracts:
Abstracts » Earth sciences

Argument supporting explosive igneous activity for the origin of "cryptoexplosion" structures in the midcontinent, United States: comments and reply

Article Abstract:

J. Luczaj opposed the hypothesis of M.R. Rampino and T. Volk, published in 1996, which stated that the explosive igneous activity for the origin of eight cryptoexplosion structures in a linear array in the midcontinental US had various ages and questioned the validity of the meteorite impact-string theory. However, questions were raised over Luzcaj's interpretation of age constraints which was not even supported by geological knowledge. Also, objections were raised regarding the unsupported assertion that shock metamorphic features led to endogenic terrestrial processes.

Author: Rampino, Michael R., Koeberl, Christian, Glikson, Andrew, Reimold, Wolf Uwe, Luczaj, John
Publisher: Geological Society of America, Inc.
Publication Name: Geology
Subject: Earth sciences
ISSN: 0091-7613
Year: 1999
Research, Analysis, Volcanological research, Volcanism, Volcanic ash, tuff, etc., Volcanic rocks, Rocks, Igneous, Igneous rocks

User Contributions:

Comment about this article or add new information about this topic:

CAPTCHA


Biostratigraphic and radiometric age data question the Milankovitch characteristics of the Latemar cycle (Southern Alps, Italy): comment and reply

Article Abstract:

Peter Brack et al.'s study is commendable for clarifying the uncertainties in ages of stage boundaries by using zircon dating of well-correlated biostratigraphic zones. Results of their study show the lower Ladinian Buchenstein Formation to be 2 to 4 m.y. old. However, assumptions made about the periodic nature of the Latemar cycles, the sampling of the volcaniclastic rocks and the dating of the zircons must all be reviewed if only to reconcile their results with both the proposed origin of the Latemar cycles and Hellmann and Lippolt's dates.

Author: Hardie, Lawrence A., Hinnov, Linda A.
Publisher: Geological Society of America, Inc.
Publication Name: Geology
Subject: Earth sciences
ISSN: 0091-7613
Year: 1997
Evaluation, Measurement, Natural history, Geology, Stratigraphic, Stratigraphy, Radioactive dating, Radiometric dating, Italian Alps, Geological time, Geochronology, Triassic period

User Contributions:

Comment about this article or add new information about this topic:

CAPTCHA


Similar abstracts:
  • Abstracts: Muscovite-garnet granites in the Mojave Desert: relation to crustal structure of the cretaceous arc: comment and reply
  • Abstracts: Documentation of a 1450 Ma contractional orogeny preserved between the 1850 Ma Sudbury impact structure and the 1 Ga Grenville orogenic front, Ontario: discussion and reply
  • Abstracts: Yucatan subsurface stratigraphy: implications and constraints for the Chicxulub impact: comment and reply. New C isotope stratigraphy from southwest China: implications fro the placement of the Precambian-Cambrian boundary on the Yangtze Platform and global correlations
  • Abstracts: Reply. West-northwest directed obduction of the Baitain Group on the eastern Oman continental margin at the Cretaceous-Tertiary boundary
  • Abstracts: Two-decked nature of the Ouachita Mountains, Arkansas. Abiological origin of described stromatolites older than 3.2 Ga: comment and reply
This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.
Some parts © 2025 Advameg, Inc.