Results 1 to 10 of about 5,261 (211)

Primordial magnetotaxis in putative giant paleoproterozoic magnetofossils [PDF]

Proceedings of the National Academy of Sciences
Magnetotactic bacteria produce chains of nanoscopic iron minerals used for navigation, which can be preserved over geological timescales in the form of magnetofossils. Micrometer-sized magnetite crystals with unusual shapes suggesting a biologically controlled mineralization have been found in the geological record and termed giant magnetofossils.
Ualisson Donardelli Bellon, Wyn Williams, Ricardo I.F. Trindade, Lara Maldanis, Douglas Galante   +4 more
openalex   +4 more sources

Changes in orogenic style and surface environment recorded in Paleoproterozoic foreland successions [PDF]

Nature Communications, 2023
The Earth’s interior and surficial systems underwent dramatic changes during the Paleoproterozoic, but the interaction between them remains poorly understood. Rocks deposited in orogenic foreland basins retain a record of the near surface to deep crustal
Bo Huang, Man Liu, Timothy M. Kusky, Tim E. Johnson, Simon A. Wilde, Dong Fu, Hao Deng, Qunye Qian   +7 more
doaj   +2 more sources

Tectonic Juxtaposition of Two Independent Paleoproterozoic Arcs by Cenozoic Duplexing in the Arun Tectonic Window of the Eastern Nepalese Himalaya

Frontiers in Earth Science, 2022
The tectonic evolution of the Himalayan orogenic belt before Cenozoic convergence is important to understand its modern structural framework. There is still controversy regarding the tectonic history of the lower Lesser Himalaya Sequence (LHS) in the ...
Rui Li, Rui Li, Rui Li, Rui Li, Songjian Ao, Songjian Ao, Wenjiao Xiao, Wenjiao Xiao, Wenjiao Xiao, Wenjiao Xiao, Karel Schulmann, Qigui Mao, Qigui Mao, Qigui Mao, Qigui Mao, Dongfang Song, Dongfang Song, Zhou Tan, Zhou Tan, Zhou Tan, Zhou Tan, Hao Wang, Hao Wang, Hao Wang, Hao Wang, Saunak Bhandari   +25 more
doaj   +2 more sources

SEM-based automated mineralogy (SEM-AM) and unsupervised machine learning studying the textural setting and elemental association of gold in the Rajapalot Au-Co area, northern Finland [PDF]

Bulletin of the Geological Society of Finland, 2021
SEM-based automated mineralogy (SEM-AM) techniques allow fast and effective way of studying the textural settings of gold in hydrothermal deposits. Unsupervised machine learning (e.g.
Jukka-Pekka Ranta, Nick Cook, Sabine Gilbricht   +2 more
doaj   +1 more source

Long-lived Paleoproterozoic eclogitic lower crust [PDF]

Nature Communications, 2021
AbstractThe nature of the lower crust and the crust-mantle transition is fundamental to Earth sciences. Transformation of lower crustal rocks into eclogite facies is usually expected to result in lower crustal delamination. Here we provide compelling evidence for long-lasting presence of lower crustal eclogite below the seismic Moho. Our new wide-angle
Sebastian Buntin, Irina M. Artemieva, Alireza Malehmir, Hans Thybo, Michal Malinowski, Karin Högdahl, Tomasz Janik, Stefan Buske   +7 more
openaire   +4 more sources

Hiekkapohja hydrothermal system – ore mineral, lithogeochemical and paleomagnetic evidence from the Paleoproterozoic Central Finland Granitoid Complex [PDF]

Bulletin of the Geological Society of Finland, 2023
The Paleoproterozoic Svecofennian Central Finland Granitoid Complex (CFGC) has been regarded as an area of low mineralisation potential. The Hiekkapohja area, 20km north-east of the town of Jyväskylä, host a concentration of variable metalliferous ...
Esa Heilimo, Sini Halonen, Satu Mertanen, Sami Niemi, Perttu Mikkola   +4 more
doaj   +1 more source

Deciphering the geochemistry of two key Paleoproterozoic siliciclastic sequences of the Piedra Alta Terrane (Río de la Plata Craton, Uruguay)

Agrociencia Uruguay, 2022
The geochemistry of two metavolcano-sedimentary sequences deposited in the Piedra Alta Terrane is compared, and their geotectonic evolution is discussed.
Gonzalo Blanco, Paulina Abre, Mabel Lanfranchini, Carlos A. Cingolani, Hector Ferrizo, Daniel Piñeyro, Norberto J. Uriz, Manuela E. Benítez   +7 more
doaj   +1 more source

Life on a Mesoarchean marine shelf – insights from the world’s oldest known granular iron formation

Scientific Reports, 2020
The Nconga Formation of the Mesoarchean (~2.96–2.84 Ga) Mozaan Group of the Pongola Supergroup of southern Africa contains the world’s oldest known granular iron formation.
Albertus J. B. Smith, Nicolas J. Beukes, Jens Gutzmer, Clark M. Johnson, Andrew D. Czaja, Noah Nhleko, Frikkie de Beer, Jakobus W. Hoffman, Stanley M. Awramik   +8 more
doaj   +1 more source

Magma feeding paleochannel in the Monchegorsk ore region: geochemistry, isotope U-Pb and Sm-Nd analysis (Kola region, Russia)

Записки Горного института, 2022
A comprehensive study of a 340 m thick lenticular-sheet body of ultramafic composition penetrated by structural well M-1 at a depth of about 2.2 km was accomplished.
Valeriy F. Smolkin, Artem V. Mokrushin, Tamara B. Bayanova, Pavel A. Serov, Aleksey A. Ariskin   +4 more
doaj   +1 more source

Constraints on Paleoproterozoic atmospheric oxygen levels [PDF]

Proceedings of the National Academy of Sciences, 2018
Significance Earth’s protracted oxygenation significantly transformed global biological and geochemical cycles. In particular, the rise of atmospheric oxygen above trace levels was an essential prerequisite for the development of animals. However, quantifying atmospheric oxygen levels in Earth’s middle age remains a daunting challenge.
Eric J. Bellefroid, Ashleigh v. S. Hood, Paul F. Hoffman, Matthew D. Thomas, Christopher T. Reinhard, Noah J. Planavsky   +5 more
openaire   +2 more sources