Results 31 to 40 of about 16,262 (232)
The Great Oxidation Event preceded a Paleoproterozoic “snowball Earth” [PDF]
Proceedings of the National Academy of Sciences, 2020 The inability to resolve the exact temporal relationship between two pivotal events in Earth history, the Paleoproterozoic Great Oxidation Event (GOE) and the first “snowball Earth” global glaciation, has precluded assessing causality between changing atmospheric composition and ancient climate change.
Warke, Matthew R. +8 more
openaire +6 more sources
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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BRYANSK-KURSK-VORONEZH INTRA-CONTINENTAL COLLISIONAL OROGEN (EAST EUROPEAN CRATON)
Геодинамика и тектонофизика, 2015 The article presents new data on the deep crustal structure, origin and evolution of the Bryansk-Kursk-Voronezh orogen in the south-eastern segment of the East European craton; it is composed of the Paleoproterozoic formations and areas of reworked ...
M. V. Mints, W. A. Bush, S. N. Ageev
doaj +1 more source
Congo River sand and the equatorial quartz factory [PDF]
, 2019 A never solved problem in sedimentary petrology is the origin of sandstone consisting exclusively of quartz and most durable heavy minerals. The Congo River offers an excellent test case to investigate under which tectonic, geomorphological, climatic ...
Andò, Sergio +10 more
core +1 more source
Геодинамика и тектонофизика, 2020 A critical discussion of competing models of the geodynamic nature (oceanic or continental subduction) and age (Meso-Neoarchean or Late Paleoproterozoic) of the eclogite facies metamorphism in the Belomorian eclogite province (BEP) is based on the ...
M. V. Mints, K. A. Dokukina
doaj +1 more source
FAULT SYSTEMS IN THE UPPER CRUST OF THE FENNOSCANDIAN SHIELD, THE EAST EUROPEAN PLATFORM
Геодинамика и тектонофизика, 2020 Directions of 683 faults located in the southeastern part of the Fennoscandian (Baltic) shield were statistically analyzed, and three orthogonal associations of fault systems were identified in the study area.
V. S. Burtman, S. Yu. Kolodyazhny
doaj +1 more source
Analysis of a Precambrian resonance-stabilized day length [PDF]
, 2016 During the Precambrian era, Earth's decelerating rotation would have passed a 21-hour period that would have been resonant with the semidiurnal atmospheric thermal tide.
Bartlett, Benjamin C. +1 more
core +3 more sources
Paleoproterozoic molassoid complexes of SW Chana
Moscow University Bulletin. Series 4. Geology, 2016 Based on a study of modern-day published evidences and own data the lithology, conditions of sedimentations, tectonic evolution and mineralization of molassoid complexes of SW Ghana which filled Tarkwa and Bui basins within the Birrimian paleoproterozoic orogenic belt are considered.
N. A. Bozhko +2 more
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Platinum group element mineralization at Musongati (Burundi) : concentration and Pd-Rh distribution in pentlandite [PDF]
, 2017 The mafic-ultramafic intrusions of the Karagwe-Ankole belt in Burundi are considered as a new potential source for platinum group elements (PGE). The intrusions have mainly been studied for their PGE potential with regard to PGE concentration, but the ...
Dewaele, Stijn +2 more
core +1 more source
Paleoproterozoic sterol biosynthesis and the rise of oxygen [PDF]
Nature, 2017 Natural products preserved in the geological record can function as 'molecular fossils', providing insight into organisms and physiologies that existed in the deep past. One important group of molecular fossils is the steroidal hydrocarbons (steranes), which are the diagenetic remains of sterol lipids.
Gold, David +3 more
openaire +4 more sources