GERTA KELLER BOOKS

SPE505: Volcanism, Impacts, and Mass Extinctions: Causes and Effects

TitleSPE505: Volcanism, Impacts, and Mass Extinctions: Causes and Effects
Publication TypeBook
Year of Publication2014
AuthorsKeller, G, Kerr, AC
Series TitleGSA Special Papers
Volume505
PublisherGeological Society of America
CityBoulder
ISBN978-0-8137-2505-5
Abstract

The 26 chapters of this symposium volume encompass reviews of special topics, summaries of particular datasets and original research contributions. Together they span age intervals ranging from the Neoproterozoic, Mesozoic to Paleogene and Recent addressing a variety of stratigraphic, paleoecologic, environmental and paleoclimatic events. These contributions are organized under four themes: 1. Applications, 2. Paleoecology—Recent, 3. Global bioevents—PE and KTB, and 4. Biodiversity and Stratigraphy in Deep Time. 

URLhttp://specialpapers.gsapubs.org/content/current
DOI10.1130/9780813725055

Proceedings of XXIII Indian Colloquium on Micropaloentology and Stratigraphy and International Symposium on Global Bioevents

TitleProceedings of XXIII Indian Colloquium on Micropaloentology and Stratigraphy and International Symposium on Global Bioevents
Publication TypeBook
Year of Publication2013
AuthorsMalarkodi, N, Keller, G, Reddy, AN, Jaiprakask, BC
Volume1
EditionSpecial Publication
Number of Pagesxii + 338
PublisherGeological Society of India
CityBangalore
ISBN978-93-80998-08-4
Abstract

The 26 chapters of this symposium volume encompass reviews of special topics, summaries of particular datasets and original research contributions. Together they span age intervals ranging from the Neoproterozoic, Mesozoic to Paleogene and Recent addressing a variety of stratigraphic, paleoecologic, environmental and paleoclimatic events. These contributions are organized under four themes: 1. Applications, 2. Paleoecology - Recent, 3. Global bioevents - PE and KTB, and 4. Biodiversity and Stratigraphy in Deep Time. 

URLhttp://www.geosocindia.com/index.php?page=shop.product_details&flypage=flypage-ask.tpl&product_id=227&category_id=20&option=com_virtuemart&Itemid=6

The End-Cretaceous Mass Extinction and the Chicxulub Impact in Texas

TitleThe End-Cretaceous Mass Extinction and the Chicxulub Impact in Texas
Publication TypeBook
Year of Publication2011
Series EditorKeller, G, Adatte, T
Series VolumeSEPM Special Publication Volume 100
PublisherSEPM Society for Sedimentary Geology
ISBN Number9781565763098
ISBN9781565763081
Abstract

One of the liveliest, contentious, and long-running scientific debates began over three decades ago with the discovery of an iridium anomaly in a thin clay layer at Gubbio, Italy, that led to the hypothesis that a large impact caused the end-Cretaceous mass extinction. For many scientists the discovery of an impact crater near Chicxulub on Yucatan in 1991 all but sealed the impact-kill hypothesis as proven with the impact as sole cause for the mass extinction. Ever since that time evidence to the contrary has generally been interpreted as an impact-tsunami disbturbance. A multi-disciplinary team of reserachers has tested this assertion in new cores and a dozen outcrops along the Brazos River, Texas. In this area undisturbed sediments reveal a complete time stratigraphic sequence containing the primary impact spherule ejecta layer in late Maastrichtian claystones deposited about 200-300 thousand years before the mass extinction.  PDF

URLhttp://ebooks.geoscienceworld.org/content/the-end-cretaceous-mass-extinction-and-the-chicxulub-impact-in-texas.tab-info
DOI10.2110/sepmsp.100

Special Paper 356: Two anomalies of platinum group elements above the Cretaceous-Tertiary boundary at Beloc, Haiti: Geochemical context and consequences for the impact scenario

TitleSpecial Paper 356: Two anomalies of platinum group elements above the Cretaceous-Tertiary boundary at Beloc, Haiti: Geochemical context and consequences for the impact scenario
Publication TypeBook
Year of Publication2002
AuthorsStüben, D, Kramar, U, BERNER, ZSOLT, Eckhardt, J-D, Stinnesbeck, W, Keller, G, Adatte, T, Heide, K
Volume356
Number of Pages163 - 188
PublisherGeological Society of America
Abstract

A detailed geochemical investigation of an expanded Cretaceous-Tertiary (K-T) boundary section near Beloc (B3), Haiti, reveals a complex pattern of sedimentation of multiple origins as a result of erosional, biogenic, volcanic, and impact events. Carbonate-rich uppermost Maastrichtian sediments with high excess rates for Cu, Zn, and Sr (biogenic origin) indicate high productivity (δ13C) and warm temperatures (δ18O). These sediments are overlain by Paleocene (early Danian zone P1a) spherulerich clayey layers that indicate lower productivity, lower temperatures, and high input of glass and biogenic carbonate. Reworked Maastrichtian sediments are mixed with spherule-rich layers. This spherule-rich deposit is topped by a thin layer rich in Fe that also contains an Ir-dominated anomaly of platinum group elements (PGE) with an almost chondritic abundance pattern, which appears to be the result of a cosmic influx. Monotonous limestones above this interval reflect recovery to normal pelagic sedimentation, which is interrupted by a second PGE anomaly in an Fe-rich clayey layer in the middle part of zone P1a. All PGEs are enriched in this interval and the PGE pattern is basalt like, suggesting a volcanic source. Both PGE anomaly horizons coincide with productivity and temperature changes.  PDF

URLhttp://www.gsajournals.org/perlserv/?request=get-specialpub-toc&isbn=0-8137-2356-6http://specialpapers.gsapubs.org/cgi/doi/10.1130/0-8137-2356-6.163
DOI10.1130/0-8137-2356-610.1130/0-8137-2356-6.163

Field guide to Cretaceous-tertiary boundary sections in northeastern Mexico

TitleField guide to Cretaceous-tertiary boundary sections in northeastern Mexico
Publication TypeBook
Year of Publication1994
AuthorsKeller, G, Stinnesbeck, W, Adatte, T, MacLeod, N, Lowe, DR
Series TitleLPI Contribution No 827
Number of Pages110
PublisherLunar and Planetary Institute
CityHouston
Abstract

This guide was prepared for the field trip to the KT elastic sequence of northeastern Mexico, 5-8 February 1994, in conjunction with the Conference on New Developments Regarding the KT Event and Other Catastrophes in Earth History, held in Houston, Texas. The four-day excursion offers an invaluable opportunity to visit three key outcrops: Arroyo El Mimbral, La Lajilla, and El Pinon. These and other outcrops of this sequence have recently been interpreted as tsunami deposits produced by the meteorite impact event that produced the 200 to 300-km Chicxulub basin in Yucatan, and distributed ejecta around the world approximately 65 m.y. ago that today is recorded as a thin clay layer found at the K/T boundary. The impact tsunami interpretation for these rocks has not gone unchallenged, and others examining the outcrops arrive at quite different conclusions: not tsunami deposits but turbidites; not KT at all but 'upper Cretaceous.' Indeed, it is in hopes of resolving this debate through field discussion, outcrop evaluation, and sampling that led the organizers of the conference to sanction this field trip. This field guide provides participants with background information on the KT clastic sequence outcrops and is divided into two sections. The first section provides regional and logistical context for the outcrops and a description of the clastic sequence. The second section presents three representative interpretations of the outcrops by their advocates. There is clearly no way that these models can be reconciled and so two, if not all three, must be fundamentally wrong. Readers of this guide should keep in mind that many basic outcrop observations that these models are based upon remain unresolved. While great measures were taken to ensure that the information in the description section was as objective as possible, many observations are rooted in interpretations and the emphasis placed on certain observations depends to some degree upon the perspective of the author.

URLhttp://www.researchgate.net/publication/24303161_Field_guide_to_Cretaceous-tertiary_boundary_sections_in_northeastern_Mexico