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Caledonian reactivation and reworking of Timanian thrust systems and implications for latest Mesoproterozoic to mid-Paleozoic tectonics and magmatism in northern Baltica.
Open Res Eur
October 2024
Brønnøy Kalk, Velfjord, Nordland, 8960, Norway.
Background: The Trollfjorden-Komagelva Fault Zone is the southernmost thrust fault of the Timanian Orogen and extends for thousands of kilometers from northwestern Russia to northern Norway. Though there is little about its location onshore northeastern Norway, where it is mapped as a major fault system dominantly comprised of NNE-dipping thrust faults, its continuation to the west below Caledonian nappes and offshore post-Caledonian sedimentary basins remains a matter of debate.
Methods: The present study provides a more definitive answer about the continuation of Trollfjorden-Komagelva Fault Zone west of the Varanger Peninsula by using seismic reflection, bathymetric, topographic, and magnetic data onshore Finnmark and offshore on the Finnmark Platform.
Sampling Mars: Geologic context and preliminary characterization of samples collected by the NASA Mars 2020 Perseverance Rover Mission.
Proc Natl Acad Sci U S A
January 2025
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109.
The NASA Mars 2020 Perseverance Rover Mission has collected samples of rock, regolith, and atmosphere within the Noachian-aged Jezero Crater, once the site of a delta-lake system with a high potential for habitability and biosignature preservation. Between sols 109 and 1,088 of the mission, 27 sample tubes have been sealed, including witness tubes. Each sealed sample tube has been collected along with detailed documentation provided by the Perseverance instrument payload, preserving geological and environmental context.
View Article and Find Full Text PDFThe subseafloor crustal biosphere: Ocean's hidden biogeochemical reactor.
Front Microbiol
November 2024
Department of Biological Sciences, University of Southern California, Los Angeles, CA, United States.
Underlying the thick sediment layer in ocean basins, the flow of seawater through the cracked and porous upper igneous crust supports a previously hidden and largely unexplored active subsurface microbial biome. Subseafloor crustal systems offer an enlarged surface area for microbial habitats and prolonged cell residence times, promoting the evolution of novel microbial lineages in the presence of steep physical and thermochemical gradients. The substantial metabolic potential and dispersal capabilities of microbial communities within these systems underscore their crucial role in biogeochemical cycling.
View Article and Find Full Text PDFA crustal Pb isotope map of southeastern Australia.
Sci Data
November 2024
John de Laeter Centre, Curtin University, Perth, WA, 6102, Australia.
Lead isotopes are a powerful geochemical tracer and a popular tool applied across a broad range of scientific fields, e.g., earth sciences, archaeology, and forensic sciences.
View Article and Find Full Text PDFA simplified dual-column system for Li purification and isotopic analysis of geological materials by MC-ICP-MS.
Talanta
February 2025
State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang, 330013, China.
Lithium (Li) isotopes have been widely used to investigate continental weathering, climate change, recycling of surface materials and ore formation. However, muti-column systems and/or a large volume of eluents are generally required for Li purification and its accurate isotopic measurements due to variably high matrix/Li ratios of different geological materials. Here we present a simplified dual-column system with small volumes of resins (3 mL + 2 mL) and eluents (16 mL 0.
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