Geophysical Monograph Series, Page 305-323., 2021 Exploring the links between Large Igneous Provinces and dramatic environmental impact
An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Brian Kendall +2 more
wiley +8 more sources
Late Precambrian U-Pb titanite age for peak regional metamorphism and deformation (Knoydartian orogeny) in the western Moine, Scotland [PDF]
, 2003 There has been controversy over the number and timing of orogenies in the Precambrian Moine block in the Scottish Caledonides since the earliest radiometric dating in the 1960s. This work challenges a recent hypothesis, that this sector of the Laurentian
Tanner, P.W.G., Evans, J.A.
core +8 more sources
Effect of Laboratory Reagents for Cleaning Modern Contamination on the δ<sup>15</sup>N Integrity of Nitrogen-Poor Samples. [PDF]
Rapid Commun Mass SpectromABSTRACT Rationale Nitrogen isotope values have been widely used for tracing ancient biogeochemical processes, but contaminant‐sensitive materials, such as Precambrian sedimentary rocks, meteorites, or returned extraterrestrial samples, often have low nitrogen levels and are thus vulnerable to modern organic contamination.
Bubphamanee K, Schauer A, Buick R.
europepmc +2 more sources
Lethaia, EarlyView., 2021 Biomineralization is a generic term used to indicate biological‐mediated mineral formation. In carbonate mineralization, nucleation of crystals can be: (1) controlled directly by the organisms, like in the skeletal formation of most metazoans; (2) induced by microbial communities, by indirect precipitation mediated by their metabolic activities; or (3)
Adriano Guido +4 more
wiley +1 more source
Paleolatitude and cause of the Svecokarelian orogeny [PDF]
Bulletin of the Geological Society of Finland, 1974 Paleomagnetic data suggest a paleolatitude of 22°N for the Fennoscandian protocontinent during the Svecokarelian orogeny. This is lower than that of the Canadian shield during the same period.
K.J. Neuvonen
doaj +1 more source
Dolomitic Microfossil Preservation in a Cryogenian Microbial Reef, Arkaroola (South Australia). [PDF]
GeobiologyABSTRACT Microbial dolostones that now form the Arkaroola reef, northern Adelaide Rift Complex, and were deposited during the Cryogenian interglacial period, display a wide range of meso‐scale stromatolite morphotypes in outcrop. Microcharacterisation involving optical microscopy, combined scanning electron microscopy and energy dispersive spectroscopy
Champenois F, Corkeron ML, George AD.
europepmc +2 more sources
New principles in creation of stratigraphic scheme of the precambrian of the Ukrainian shield
Мінеральні ресурси України, 2018 The article deals with current “Сorrelation chronostratigraphic scheme of еarly Precambrian formations of the Ukrainian Shield” should be divided into two parts: the “Correlation stratigraphic scheme of the Lower-Precambrian formations” and “The scheme ...
M. M. Kostenko
doaj +1 more source
Geosciences, 2021 The results from the geological and geophysical investigations of the Siljan Ring impact structure (central Sweden) have shown that the Paleozoic sedimentary succession and the Precambrian basement were strongly affected by complex deformational ...
Olga Sivalneva +7 more
doaj +1 more source
The Precambrian marine carbonate isotope database: version 1.1. [PDF]
, 2002 We present a compilation of strontium, carbon, and oxygen isotope compositions of roughly 10,000 marine carbonate rocks of Archean - Ordovician age (3800 Ma – 450 Ma).
Shields, GA +5 more
core +1 more source
Geochemistry, Geophysics, Geosystems, 2022 The deep ocean is generally considered to have changed from anoxic in the Precambrian to oxygenated by the Late Paleozoic (∼420–400 Ma) due to changes in atmospheric oxygen concentrations.
Daniel A. Stolper +5 more
doaj +1 more source