Results 171 to 180 of about 8,820 (215)

Breakup of a Paleoproterozoic Supercontinent

Gondwana Research, 2002
Abstract If a Paleoproterozoic supercontinent broke up between 1.6 and 1.5 Ga, the distribution of sutures shows that the breakup was not complete. At least two large cratons, Atlantica (Amazonia, Congo, West Africa and probably North Africa and Rio de la Plata) and Arctica (Laurentia, Siberia, Baltica, North Australia and North China), survived the ...
Kent Condie
exaly   +2 more sources

A Paleoproterozoic ophiolitic mélange, Yangtze craton, South China: Evidence for Paleoproterozoic suturing and microcontinent amalgamation

Precambrian Research, 2017
Abstract We document for the first time the presence of a Paleoproterozoic ophiolitic melange in the Archean–Paleoproterozoic Kongling Complex in the northern Huangling Dome, Yangtze craton, South China. Detailed field mapping, petrographic, geochronological and geochemical studies reveal that the melange consists of a suite of amphibolite facies ...
Xingfu Jiang, Timothy Kusky, Ali Polat   +2 more
exaly   +2 more sources

An early Paleoproterozoic high-K intrusive complex in southwestern Tarim Block, NW China: Age, geochemistry, and tectonic implications

Gondwana Research, 2007
Systematic geochronologic, geochemical, and Nd isotopic analyses were carried out for an early Paleoproterozoic high-K intrusive complex exposed in southwestern Tarim, NW China.
Xian-Hua Li, Zhang Chuan-Lin, Zheng-Xiang Li   +2 more
exaly   +2 more sources

Paleoproterozoic Birimian Geology for sustainable development

Journal of African Earth Sciences, 2018
The aim of this volume namely “Paleoproterozoic Birimian Geology of West African Craton for Sustainable Development” is the fruit of IGCP638 meetings in Senegal and Morocco. It is the characterization of ore deposits which is specific to geological conditions (P, T, t) depending on the rheology of rocks, their emplacement mode and of their tectonic and
Aifa, Tahar
openaire   +3 more sources

The Paleoproterozoic Evolution of Basement Rocks of the Taebaeksan Basin, Korean Peninsula, and Their Correlation to Those of the Paleoproterozoic Massifs in the Korean Peninsula

Minerals (Basel, Switzerland), 2023
The Korean Peninsula mainly comprises the Paleoproterozoic Gwanmo, Nangnim, Gyeonggi, and Yeongnam massifs from north to south. The Paleoproterozoic basement is rarely exposed in the Paleozoic Taebaeksan basin, which is located in the northeastern part ...
Byung Choon Lee, Chang Whan Oh, Bo Young Lee   +2 more
exaly   +2 more sources

A Paleoproterozoic A-type Rhyolite

Chinese Journal of Geochemistry, 1999
The rhyolites in the upper Luliang Group of Shanxi, China, are Paleoproterozoic weakly alkaline volcanic rocks. They are characterized by high SiO2, Na2O + K2O, Zr, Nb, Ga, Y and REE contents and large FeO* /MgO, Rb/Sr and Ga/Al ratios, and low CaO, Sr and Eu contents, and share much in common with the A-type granitic rocks.
Yu Jinhai, Wang Dezi
openaire   +1 more source

The Paleoproterozoic megascopic Stirling biota

Paleobiology, 2007
Abstract The 2.0–1.8-billion-year-old Stirling Range Formation in southwestern Australia preserves the deposits of a siliciclastic shoreline formed under the influence of storms, longshore currents, and tidal currents.
Stefan Bengtson, Birger Rasmussen, Bryan Krapež   +2 more
openaire   +1 more source

Isotopic and geochemical constraints on the Paleoproterozoic Hutchison Group, southern Australia: Implications for Paleoproterozoic continental reconstructions

Precambrian Research, 2011
Abstract Geochemical, Sm–Nd isotopic, and U–Pb–Lu–Hf zircon analyses reveal the sedimentary succession formerly recognised as the Hutchison Group consists of three temporally and isotopically distinct groups, divided by a crustal-scale shear zone (Kalinjala Mylonite Zone).
Szpunar, M., Hand, M., Hatch, K., Jagodzinski, L., Belousova, E.   +4 more
openaire   +2 more sources

A strongly oxidizing Paleoproterozoic era

Science, 2018
Early Earth Two billion years ago, marine sulfate concentrations were around one-third as high as modern ones, constituting an oxidizing capacity equivalent to more than 20% of that of the modern ocean-atmosphere system. Blattler et al.
openaire   +1 more source

The Paleoproterozoic Eastern Bahia Orogenic Domain

2016
The Paleoproterozoic Eastern Bahia orogenic domain occupies an approximately 200 km-wide area in the northern Sao Francisco craton, located between the Atlantic coast and the interior plateau of Bahia state known as the Chapada Diamantina. Together with its African counterpart, the West Central African belt of Gabon, the Eastern Bahia orogenic domain ...
Johildo Salomão Figueirêdo Barbosa, Rafael Gordilho Barbosa   +1 more
openaire   +1 more source