Results 21 to 30 of about 41,082 (236)
Sr-Nd isotope geochemistry of the early Precambrian sub-alkaline mafic igneous rocks from the southern Bastar craton, Central India [PDF]
, 2009 Sr–Nd isotope data are reported for the early Precambrian sub-alkaline mafic igneous rocks of the southern Bastar craton, central India. These mafic rocks are mostly dykes but there are a few volcanic exposures.
BL Weaver +39 more
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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
Early Neoproterozoic limestones from the Gwna Group, Anglesey [PDF]
, 1998 Limestone megaclasts up to hundreds of metres in size are present within the Gwna Group mélange, North Wales, UK. The mélange has been interpreted as part of a Peri-Gondwanan fore-arc accretionary complex although the age of deposition remains ...
JANA M. HORÁK +16 more
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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
Геофизический журнал, 2022 The name «Bug Series» was introduced into the Precambrian stratigraphic scheme of the Ukrainian Shield more than half a century ago. During this period, ideas about the composition and age of the series changed several times but, until recently, the ...
V.P. Kyrylyuk
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Article 2. Structural position of suites and strata of the “Bug series”
Геофизический журнал, 2023 The name “Bug Series” was introduced into the Precambrian stratigraphic scheme of the Ukrainian Shield more than half a century ago. During this period, ideas about the composition and age of the series changed several times, but at the same time, until
V.P. Kyrylyuk
doaj +1 more source
Geo-structural map of the Laguna Blanca basin (Southern Central Andes, Catamarca, Argentina) [PDF]
, 2015 The Laguna Blanca basin is a rhomb-shaped basin located at the SE margin of the Puna plateau in the southern Central Andes (Catamarca, Argentina). An interactive analysis using remote sensing and field mapping enabled us to produce a geo-structural map ...
Massironi, Matteo +2 more
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The Late Great Unconformity of the Central Canadian Shield
Geochemistry, Geophysics, Geosystems, 2021 The Great Unconformity is a widely distributed surface separating Precambrian rocks from overlying Phanerozoic sedimentary sequences. The causes and implications of this feature, and whether it represents a singular global event, are much debated.
C. P. Sturrock +2 more
doaj +1 more source
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
Evans, J.A., Tanner, P.W.G.
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The Precambrian in the Sub-Polar Urals : the chronostratigraphic aspect.
Transactions of the Karelian Research Centre of the Russian Academy of Sciences, 2019 New geochronological data on the Lower and Upper Proterozoic complexes of the Sub-Polar Urals are presented, where the outcropping Precambrian section in the Lyapin anticlinoriumis the stratotype for the entire Timan-Northern Urals region.
Александр Михайлович Пыстин +3 more
doaj +1 more source