TY - JOUR

T1 - Stratigraphy and ecostratigraphic distribution of foraminiferal morphogroups from the Upper Jurassic of the Makar'yev section (Unzha River, Volga River basin)

AU - Colpaert, C.

AU - Nikitenko, B. L.

AU - Khafaeva, S. N.

PY - 2017/1/1

Y1 - 2017/1/1

N2 - Investigation of the Upper Callovian to Lower Kimmeridgian microfossils from the Makar'yev reference section (Unzha River, East European Platform) has been carried out. The section is characterized by ammonite debris and abundant associations of benthic and planktic foraminifers. It is a perfect object for stratigraphic and paleoecological researches. The biostratigraphic distribution of foraminifers from the Makar'yev section allows one to identify standard foraminifera zones of the East European Platform, as well as to upgrade some of them. The analysis of vertical and lateral ammonites and foraminiferal distribution, completed with litho stratigraphy, has precised the stratigraphic volume and position of boundaries of several lithological units. An improved stratigraphic scheme for the Kostroma area of the Moscow Depression is proposed. Analysis of the composition, structure, and dynamic changes of the foraminiferal assemblages has been performed. The morphofunctional analysis of foraminiferal genera has for the first time identified how foraminiferal morphogroups differing in their life style and feeding strategy varied with short-term paleoenvironmental changes. These morphogroup changes allow establishing four ecostratigraphic levels. These paleoecological data have been calibrated along with geochemical factors. They have shown a crisis of foraminiferal association during the Late Oxfordian and Early Kimmeridgian. A similar crisis has also been discovered in the north of Siberia, which may be an argument for its global distribution. The analysis of the taxonomic composition and the density of foraminiferal associations, in parallel with the structure of the association, has revealed a succession of transgressive and regressive events during the Late Callovian-Early Kimmeridgian. It allows the typification of each assemblage in relation with each event and underlines the occurrence of second-order sea-level fluctuations (middle part of the Middle Oxfordian and the earliest Kimmeridgian).

AB - Investigation of the Upper Callovian to Lower Kimmeridgian microfossils from the Makar'yev reference section (Unzha River, East European Platform) has been carried out. The section is characterized by ammonite debris and abundant associations of benthic and planktic foraminifers. It is a perfect object for stratigraphic and paleoecological researches. The biostratigraphic distribution of foraminifers from the Makar'yev section allows one to identify standard foraminifera zones of the East European Platform, as well as to upgrade some of them. The analysis of vertical and lateral ammonites and foraminiferal distribution, completed with litho stratigraphy, has precised the stratigraphic volume and position of boundaries of several lithological units. An improved stratigraphic scheme for the Kostroma area of the Moscow Depression is proposed. Analysis of the composition, structure, and dynamic changes of the foraminiferal assemblages has been performed. The morphofunctional analysis of foraminiferal genera has for the first time identified how foraminiferal morphogroups differing in their life style and feeding strategy varied with short-term paleoenvironmental changes. These morphogroup changes allow establishing four ecostratigraphic levels. These paleoecological data have been calibrated along with geochemical factors. They have shown a crisis of foraminiferal association during the Late Oxfordian and Early Kimmeridgian. A similar crisis has also been discovered in the north of Siberia, which may be an argument for its global distribution. The analysis of the taxonomic composition and the density of foraminiferal associations, in parallel with the structure of the association, has revealed a succession of transgressive and regressive events during the Late Callovian-Early Kimmeridgian. It allows the typification of each assemblage in relation with each event and underlines the occurrence of second-order sea-level fluctuations (middle part of the Middle Oxfordian and the earliest Kimmeridgian).

KW - associations

KW - biofacies

KW - East European Platform

KW - foraminifera

KW - Kimmeridgian

KW - morphogroups analysis

KW - Oxfordian

KW - paleoecology

KW - Russian Sea

KW - stratigraphy

KW - RUSSIAN PLATFORM

KW - CARBON-ISOTOPE EXCURSION

KW - SHELF DEPOSITS

KW - ASSEMBLAGES

KW - OUTER CARPATHIANS

KW - SOUTHERN SPAIN

KW - PREBETIC ZONE

KW - EVOLUTION

KW - ORGANIC-CARBON

KW - ENVIRONMENTAL SIGNIFICANCE

UR - http://www.scopus.com/inward/record.url?scp=85013187175&partnerID=8YFLogxK

U2 - 10.1016/j.rgg.2016.04.014

DO - 10.1016/j.rgg.2016.04.014

M3 - Article

AN - SCOPUS:85013187175

VL - 58

SP - 70

EP - 86

JO - Russian Geology and Geophysics

JF - Russian Geology and Geophysics

SN - 1068-7971

IS - 1

ER -