Results 41 to 50 of about 1,054 (150)
Geophysical Research Letters, Volume 51, Issue 18, 28 September 2024.Abstract The Chuanlinggou Formation in the northern North China preserves the world's earliest multicellular eukaryote microfossils. Here we present a high‐precision zircon U–Pb CA–ID–TIMS age of 1,641.7 ± 1.2 Ma for a tuff layer within the black shales of the Chuanlinggou Formation.
Shuan‐Hong Zhang +6 more
wiley +1 more source
Геодинамика и тектонофизика, 2020 The study of the Bol’shaya Tagna alkaline-carbonatite massif and adjacent areas was focused on the mineral and chemical compositions of minerals, the distribution of petrogenic and trace elements in pyroxene-free alkaline picrites in veins and dikes ...
V. B. Savel'eva +3 more
doaj +1 more source
Phytoplankton dynamics from the Cambrian Explosion to the onset of the Great Ordovician Biodiversification Event: a review of Cambrian acritarch diversity [PDF]
, 2015 Most early Palaeozoic acritarchs are thought to represent a part of the marine phytoplankton and so constituted a significant element at the base of the marine trophic chain during the ‘Cambrian Explosion’ and the subsequent ‘Great Ordovician ...
Molyneux, Stewart G. +4 more
core +3 more sources
Late-orogenic gold deposits of Egypt
Горные науки и технологии, 2018 Egypt belongs to states developing its mineral resource base. Gold-bearing territory of Egypt is located within the Nubian-Arabian shield in the Neoproterozoic collision zone of transverse thrusts.
Hani Sharafeldin Elsayed
doaj +1 more source
, 2009 International audienceThis paper sheds light on the evolution of the Patom belt. This mountain range draws an arc along the southeastern edge of the Siberian craton.
Anasimova, Svetlana, A. +7 more
core +2 more sources
Palaeomagnetism of the Bayan Gol formation, western Mongolia [PDF]
, 1996 Oriented samples of the Lower Cambrian Bayan Gol Formation from Salaany Gol, Mongolia, were collected at roughly 5 m stratigraphic intervals for palaeomagnetic analysis.
Budney, C. J. +3 more
core +1 more source
THE SOUTHERN FRAGMENT OF THE SIBERIAN CRATON: “LANDSCAPE” HISTORY OVER TWO BILLION YEARS
Геодинамика и тектонофизика, 2015 In the state-of-the-art geology, concepts of evolution of interrelated geodynamic and biotic events throughout the history of the Earth have been developed (Fig. 1). Research results on sediments, bio-stratigraphy and geodynamics of the southern fragment
Arkady M. Stanevich +4 more
doaj +1 more source
Strontium Isotopic Variations of Neoproterozoic Seawater: Implications for Crustal Evolution [PDF]
, 1991 We report high precision Sr isotopic data on carbonates from the Neoproterozoic Shaler Group, Victoria Island, Northwest Territories, Canada. Lithostratigraphic correlations with the relatively well-dated Mackenzie Mountains Supergroup constrain Shaler ...
Asmerom, Yemane +4 more
core +1 more source
Petrogenetic processes in the ultramafic, alkaline and carbonatitic magmatism in the Kola Alkaline Province: a review [PDF]
, 2005 Igneous rocks of the Devonian Kola Alkaline Carbonatite Province (KACP) in NW Russia and eastern Finland can be classified into four groups: (a) primitive mantle-derived silica-undersaturated silicate magmas; (b) evolved alkaline and nepheline syenites; (
Balaganskaya, E. +4 more
core +1 more source
Russian Geology and Geophysics, 2009 Abstract We suggest a more rigorous approach to paleogeodynamic reconstructions of the Sayan-Baikal folded area proceeding from update views of the origin and evolution of island arcs and back-arc basins. Modern island arcs and attendant back-arc basins form mainly by trench rollback caused by progressive subduction of negatively buoyant
Yu.A. Zorin +3 more
openaire +2 more sources