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Development of the Cretaceous radiolarians and planktonic foraminifers across the crises boundaries // Bulletin de l’Institut Royal des Sciences Naturelles de Belgique. Sciences de la Terreстатья
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Дата последнего поиска статьи во внешних источниках: 15 декабря 2021 г.
- Авторы: Vishnevskaya V.S., Kopaevich L.F.
- Журнал: Bulletin de l'Institut Royal des Sciences Naturelles de Belqique, Sciences de la Terre
- Том: 78
- Год издания: 2008
- Издательство: Institut Royal des Sciences Naturelles de Belgique
- Местоположение издательства: Belgium
- Первая страница: 87
- Последняя страница: 115
- Аннотация: Changes in both taxonomic composition and morphological diversity of Cretaceous radiolarian and foraminiferal assemblages are considered. Within the Boreal Realm, at the Jurassic-Cretaceous boundary, Late Jurassic Parvicingula-rich radiolarian assemblages changed into associations dominated by Stichocapsa and Spinicingula. The radiolarian family Parvicingulidae went extinct in the late Barremian-early Aptian, in correspondence with OAE 1. A marked speciation of the radiolarian genus Crolanium, which first appeared in the late Barremian, and the last occurrence of most of its species, including the index species C. cuneatum, characterises the latest Albian. Spheroid and discoid radiolarians predominated during the Cenomanian, while the Turonian saw a notable development of all radiolarian morphotypes; this event matches OAE 2 well. A marked change in radiolarian assemblages occurred across the Santonian-Campanian boundary: the late Santonian warmer-water assemblage of Pseudoaulophacus floresensis changed into early Campanian cold-water associations with Prunobrachium crassum; this event appears to be linked to OAE 3. Several phases are defined in the evolution of planktonic foraminifera. The first major adaptive radiation occurred during the Aptian; during this interval a great variety of trochoid forms appeared, as well as planispiral morphotypes and taxa with radially elongate chambers. The Albian-Cenomanian interval was a time of polytaxic development, following OAE 1. The Cenomanian-Turonian boundary was an obvious oligotaxic stage in the evolution of planktonic foraminifera (OAE 2 event). The next polytaxic stage commenced in the early Turonian and lasted until the Maastrichtian. However, in the early to late Santonian interval, the genus Marginotruncana died out. This faunal turnover can be ascribed to a cooling event and to OAE 3. The latest Santonian-early Campanian is characterised mainly by the genus Globotruncana, which increased again in diversity and abundance. The Cretaceous/Paleogene (K/Pg) boundary constitutes the most sudden extinction event in the history of planktonic foraminifera.
- Добавил в систему: Копаевич Людмила Федоровна