Late Cretaceous sea-level changes in Tunisia: a multi-disciplinary approach

TitleLate Cretaceous sea-level changes in Tunisia: a multi-disciplinary approach
Publication TypeJournal Article
Year of Publication2000
AuthorsLi, L, Keller, G, Adatte, T, Stinnesbeck, W
JournalJournal of the Geological Society
Volume157
Issue2
Pagination447 - 458
Date PublishedJan-03-2000
ISSN0016-7649
Abstract

A multi‐disciplinary study of sea‐level and climate proxies, including bulk rock and clay mineral compositions, carbon isotopes, total organic carbon (TOC), Sr/Ca ratios, and macro‐ and microfaunal associations, reveals seven major sea‐level regressions in the southwestern Tethys during the last 10 million years of the Cretaceous: late Campanian (c. 74.2  Ma, 73.4–72.5  Ma and 72.2–71.7  Ma), early Maastrichtian (70.7–70.3  Ma, 69.6–69.3  Ma, and 68.9–68.3  Ma), and late Maastrichtian (65.45–65.3  Ma). Low sea levels are generally associated with increased terrigenous influx, low kaolinite/chlorite + mica ratios, high TOC and high Sr/Ca ratios, whereas high sea levels are generally associated with the reverse conditions. These sea‐level changes may be interpreted as eustatic as suggested by the global recognition of at least four of the seven major regressions identified (74.2  Ma, 70.7–70.3  Ma, 68.9–68.3  Ma and 65.45–65.3  Ma). Climatic changes inferred from clay mineral contents correlate with sea‐level changes: warm or humid climates accompany high sea levels and cooler or arid climates generally accompany low sea levels. PDF

URLhttp://jgs.lyellcollection.org/cgi/doi/10.1144/jgs.157.2.447http://jgs.geoscienceworld.org/cgi/doi/10.1144/jgs.157.2.447
DOI10.1144/jgs.157.2.447
Short TitleJournal of the Geological Society