Correlating environmental changes during early Albian oceanic anoxic event1B using benthic foraminiferal paleoecology

The nature and consequences of mid-Cretaceous oceanic anoxic events (OAEs) are the subject of ongoing debate, and recent studies have shown that diffe rent scenarios are needed to explain each of these events. Nevertheless, si milarities between the different OAEs can be observed. Here, we have recons tructed paleoenvironmental changes during the early Albian OAE Ib using ben thic foraminiferal distributions and lithologies in three sections from dif ferent basins and paleowater depths. Eutrophic conditions, as indicated by the presence of infaunal as well as opportunistic genera such as Gyroidinoi des, Pseudobolivina, Pleurostomella and bolivinitids, prevailed before and during the OAE and led to dysoxic to anoxic conditions. Dysoxia was most in tense in the bathyal sections but also occurred in the outer shelf where mo re heterogeneous patterns of foraminiferal distributions are believed to re flect fluctuations of the upper boundary of an oxygen-minimum zone. A chang e from eutrophic to mesotrophic conditions caused the termination of OAE Ib and opportunistic benthic foraminifera (e.g. Pseudobolivina, Pleurostomell a) were the first to subsequently repopulate the bathyal sea floor. Repopul ation occurred rapidly in the shallow settings and gradually in the deeper sites, where a normal, diverse pre-event fauna was established a few tens o f thousands of years after OAE Ib. (C) 1999 Elsevier Science B.V. All right s reserved.