Skip to Main Content
GEOREF RECORD

Cretaceous-Paleogene boundary deposits at Loma Capiro, central Cuba; evidence for the Chicxulub impact

Laia Alegret, Ignacio Arenillas, Jose A. Arz, Consuelo Diaz, Jose M. Grajales-Nishimura, Alfonso Melendez, Eustoquio Molina, Reinaldo Rojas and Ana R. Soria
Cretaceous-Paleogene boundary deposits at Loma Capiro, central Cuba; evidence for the Chicxulub impact
Geology (Boulder) (September 2005) 33 (9): 721-724

Abstract

A newly discovered Upper Cretaceous to lower Paleogene section at Loma Capiro (central Cuba) has provided new evidence for a Cretaceous-Paleogene boundary age for the Chicxulub impact. The studied sediments at Loma Capiro consist of a foraminifera-rich marl and sandstone hemipelagic sequence, and a 9.6-m-thick intercalated clastic complex. Planktic foraminifera indicate an upper Maastrichtian age for the sediments below the clastic complex and a lowermost Danian age for those just above this complex. Small benthic foraminifera from below and above the clastic complex indicate deposition at middle to lower bathyal depths. The fining-upward clastic complex consists of a basal breccia that is overlain by microconglomerates and coarse- to fine-grained sandstones. The clastic complex contains reworked foraminifera from different ages and different paleoenvironments and, toward the top, impact material such as altered microtektites, shocked quartz, terrestrial chondrules, and accretionary lapilli. These microfacies suggest deposition from gravity flows that eroded sediments from upper-slope and shelf settings and redeposited them in deeper bathyal environments. We suggest that the origin of the clastic complex may be linked to the collapse of the Cuban platform, triggered by the Cretaceous-Paleogene impact at Chicxulub.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 33
Serial Issue: 9
Title: Cretaceous-Paleogene boundary deposits at Loma Capiro, central Cuba; evidence for the Chicxulub impact
Affiliation: University College London, Department of Earth Sciences, London, United Kingdom
Pages: 721-724
Published: 200509
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 18
Accession Number: 2005-060972
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2005131
Illustration Description: illus. incl. strat. col., sketch map
N22°00'00" - N23°00'00", W80°00'00" - W79°30'00"
Secondary Affiliation: Universidad de Zaragoza, ESP, SpainInstituto de Geologia y Paleontologia, CUB, CubaInstituto Mexicano del Petroleo, MEX, MexicoMuseo Nacional de Historia Natural, CUB, Cuba
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200537
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal