Results 21 to 30 of about 6,689 (261)

Integration of Darriwilian (Middle Ordovician) δ13Corg chemostratigraphy with graptolite biostratigraphy in the classical Röstånga area in northwestern Scania (southern Sweden) [PDF]

Estonian Journal of Earth Sciences, 2020
The largely covered Middle Ordovician succession in the classic geological Röstånga area in northwestern Scania has not been studied for some 80 years.
Stig M. Bergström, Per Ahlberg, Jörg Maletz, Frans Lundberg, Michael M. Joachimski   +4 more
doaj   +1 more source

Chemostratigraphy and paleoenvironmental analysis of sand-shale formations using core geochemical spectroscopy tools

Proceedings of the Nigerian Society of Physical Sciences
Modern investigations into spectral gamma-ray (SGR) records enhance understanding of sedimentary environments and paleoenvironmental conditions. This study examines a 111 m sand and shale interval in the Tak-1 well, Niger Delta Basin, to characterize ...
Oluwakemi Efemena, Franklin Lucas
doaj   +3 more sources

Stable carbon isotope stratigraphy of the Silurian in the Jočionys-299 borehole (eastern Lithuania) [PDF]

Estonian Journal of Earth Sciences, 2022
In recent years it has become commonplace to formalize chemostratigraphic units and identify isotopic zones (chemo­stratigraphic units) from excursions.
Tomas Želvys, Antanas Brazauskas, Andrej Spiridonov, Mykolas Balčiūnas, Andrius Garbaras, Sigitas Radzevičius   +5 more
doaj   +1 more source

Carbonate storm deposits and C, O isotopes of the Lagoa do Jacaré Formation (Ediacaran) in the Paraopeba area, Bambuí Group, Brazil [PDF]

Brazilian Journal of Geology, 2022
A section investigated in the region of Paraopeba, Minas Gerais, provided detailed sedimentologic, stratigraphic and chemostratigraphic data from the Ediacaran Lagoa do Jacaré Formation, Bambuí Group, Southeast Brazil.
Marcio Vinicius Santana Dantas, Alexandre Uhlein, Gabriel Jubé Uhlein, Alex Rodrigues de Freitas, Thaís Keuffer Mendonça, José Arthur Oliveira Santos, Samuel Amaral Moura Silva   +6 more
doaj   +1 more source

Late Cenomanian-Turonian isotopic stratigraphy in the chalk of the Paris Basin (France): a reference section between the Tethyan and Boreal realms

BSGF - Earth Sciences Bulletin, 2021
A chemostratigraphic study (δ13C and δ18O) of the Late Cenomanian and Turonian chalk succession from the “Craie 701” Poigny borehole (near Provins in the Paris Basin, France) provides new high-resolution stable carbon and oxygen isotope data. Correlation
Le Callonnec Laurence, Briard Justine, Boulila Slah, Galbrun Bruno   +3 more
doaj   +1 more source

An integrative biostratigraphic, chemostratigraphic, and sequence stratigraphic perspective of the Ordovician–Silurian boundary on Anticosti Island (Canada) [PDF]

Estonian Journal of Earth Sciences, 2023
Anticosti Island, Canada, has long been recognized as an exceptional Ordovician–Silurian boundary succession with the potential to serve as one of the best records of climatic, oceanographic, and biological events associated with the Late Ordovician ...
Joshua B. Zimmt, Steven M. Holland, Mariko Cappello, David S. Jones, Jisuo Jin, Jon M. Husson, Blair Schoene, Charles Mitchell, Michael Melchin, Seth Finnegan, André Desrochers   +10 more
doaj   +1 more source

Geochemical and palaeontological evidence for the definition of the Silurian/Devonian boundary in the Changwantang Section, Guangxi Province, China [PDF]

Estonian Journal of Earth Sciences, 2015
Southern Guangxi Province is one of the important areas for the study of the Silurian/Devonian boundary (SDB) in South China. Despite attempts to define the exact level of the SDB in the Yulin (Guangxi Province) area using biostratigraphy, no consensus ...
Wen-jin Zhao, Guo-dong Jia, Min Zhu, You’an Zhu   +3 more
doaj   +1 more source

Geology, lithogeochemistry and paleotectonic setting of the host sequence to the Kangasjärvi Zn-Cu deposit, central Finland: Implications for volcanogenic massive sulphide exploration in the Vihanti-Pyhäsalmi district [PDF]

Bulletin of the Geological Society of Finland, 2004
The Kangasjärvi Zn-Cu deposit is a highly deformed and metamorphosed Paleoproterozoic volcanogenic massive sulphide (VMS) deposit located in the Vihanti-Pyhäsalmi base metal mining district of central Finland.
M.D. Roberts, N.H.S. Oliver, R. Lahtinen
doaj   +1 more source

Přídolí carbon isotope trend and upper Silurian to lowermost Devonian chemostratigraphy based on sections in Podolia (Ukraine) and the East Baltic area [PDF]

Estonian Journal of Earth Sciences, 2012
Insufficient knowledge of carbon isotope cycling in the latest Silurian initiated the study of two regions at the western and southwestern margins of Baltica in order to obtain a more complete picture about the carbon isotope trend through the Přídolí ...
Dimitri Kaljo, Tõnu Martma, Volodymyr Grytsenko, Antanas Brazauskas, Donatas Kaminskas   +4 more
doaj   +1 more source

Stratigraphy and facies differences of the Middle Darriwilian Isotopic Carbon Excursion (MDICE) in Baltoscandia [PDF]

Estonian Journal of Earth Sciences, 2020
The Middle Darriwilian Isotopic Carbon Excursion (MDICE) is a global isotopic event described in sections from different palaeocontinents. Here we present new stable carbon isotopic data from carbonates of ten sections in different parts of the ...
Leho Ainsaar, Oive Tinn, Andrei V. Dronov, Enli Kiipli, Sigitas Radzevičius, Tõnu Meidla   +5 more
doaj   +1 more source