Results 21 to 30 of about 3,632 (206)

AN ACTIVE NEOPROTEROZOIC CONTINENTAL MARGIN OF THE ZAVKHAN MICROCONTINENT (MONGOLIA): ISOTOPIC-GEOCHRONOLOGICAL EVIDENCE

open access: yesГеодинамика и тектонофизика, 2022
There have been presented the results of the study of a thick (no less than 2–3 km), extended (for more than 200 km) volcanogenic formation (Tsetsen-Uul or Yargait) in the south of the Zavkhan terrane of the Central Asian fold belt.
S. I. Shkolnik   +2 more
doaj   +1 more source

Ocean acidification in the aftermath of the Marinoan glaciation [PDF]

open access: yes, 2014
Boron isotope patterns preserved in cap carbonates deposited in the aftermath of the younger Cryogenian (Marinoan, ca. 635 Ma) glaciation confirm a temporary ocean acidification event on the continental margin of the southern Congo craton, Namibia.
Fallick, Anthony E.   +3 more
core   +1 more source

Geochronology, Petrology and Geochemistry of Intermediate and Mafic Rocks of Bornaward Plutonic Complex (Northwest Bardaskan, Iran)

open access: yesJournal of Economic Geology, 2019
Introduction The study area is located in the northeast of Iran (the Khorasan Razavi province) and 28 km northwest of Bardaskan city and in position of 57˚ 46΄ to 57˚ 52΄ latitude and 35˚ 21΄ to 35˚ 24΄ longitude. The study area is a part of Taknar zone.
Reza Monazzami Bagherzadeh   +7 more
doaj   +1 more source

The eastern Jan Mayen microcontinent volcanic margin [PDF]

open access: yesGeophysical Journal International, 2012
<p>The Jan Mayen Ridge (JMR) is a 150-km-long and 10–30 km wide seafloor expression in N-S direction in the centre of the North Atlantic and part of the Jan Mayen Microcontinent (JMMC). Previous studies show that the eastern flank of the JMR was formed during the breakup of the Norway Basin along today’
Asbjørn Johan Breivik   +3 more
openaire   +5 more sources

Kazakhstan and Tarim microcontinents on the Devonian paleotectonic reconstructions

open access: yesЛитосфера, 2018
Devonian latitudes of the Kazakhstan and Tarim microcontinents obtained from paleomagnetic data. Definition based on the results of the study pre-folded high-temperature components of magnetization of rocks.
Valentin S. Burtman, Ariadna V Dvorova
doaj   +1 more source

Petrology and geochemistry of Eocene volcanic rocks from southeast of Khur (Isfahan province, Central Iran)

open access: yesJournal of Economic Geology, 2022
Introduction Subduction-related magmas are characterized by enrichment of large ion lithophile elements (LILEs), light rare earth elements (LREEs) and depletion in high field strength elements (HFSEs) (Harangi et al., 2007). These geochemical signatures
Paniz Shadman, Ghodrat Torabi
doaj   +1 more source

The eoorthid brachiopod Apheoorthina in the Lower Ordovician of NW Argentina and the dispersal pathways along western Gondwana [PDF]

open access: yes, 2016
The eoorthid brachiopod Apheoorthina is reported for the first time from the Lower Ordovician of NW Argentina. It is represented by a species similar to A.
Benedetto, Juan Luis Arnaldo   +1 more
core   +2 more sources

Microcontinents and Continental Fragments Associated With Subduction Systems [PDF]

open access: yesTectonics, 2020
AbstractMicrocontinents and continental fragments are small pieces of continental crust that are surrounded by oceanic lithosphere. Although classically associated with passive margin formation, here we present several preserved microcontinents and continental fragments associated with subduction systems.
J. M. van den Broek, C. Gaina
openaire   +2 more sources

Possible provenance of IRD by tracing late Eocene Antarctic iceberg melting using a high-resolution ocean model [PDF]

open access: yesClimate of the Past
The Eocene–Oligocene transition (EOT) is characterised by the inception of the large-scale Antarctic ice sheet. However, evidence of earlier glaciation during the Eocene has been found, including the presence of ice-rafted debris (IRD) at Ocean Drilling ...
M. V. Elbertsen   +3 more
doaj   +1 more source

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