Results 21 to 30 of about 81 (73)

Keurusselkä impact structure, Finland—Overview, new observations, and renewed interpretation of the size

Meteoritics &Planetary Science, Volume 57, Issue 11, Page 2063-2080, November 2022., 2022
Abstract The Keurusselkä structure is one of Finland's 12 meteorite impact structures—one of the world's oldest (1150 ± 10 Ma) and the largest of its kind in Finland. Findings of numerous well‐formed shatter cones in a wide area have helped define and prove Keurusselkä's impact origin.
Satu Hietala, Jarmo Moilanen, Jüri Plado   +2 more
wiley   +1 more source

Detrital zircon geochronology of Paleoproterozoic metasedimentary rocks from Jämsä, Central Finland [PDF]

Bulletin of the Geological Society of Finland
In this short communication, we present new detrital single grain zircon U-Pb data for six metasedimentary rock samples from Jämsä, Central Finland.
Perttu Mikkola, Matti Kurhila, Hannu Huhma   +2 more
doaj   +1 more source

Petrophysics of Chicxulub Impact Crater's Peak Ring

Journal of Geophysical Research: Solid Earth, Volume 127, Issue 5, May 2022., 2022
Abstract A new set of physical property measurements was undertaken on 29 peak‐ring samples from the IODP‐ICDP Expedition 364. Among the studied lithologies, the dominant one recovered in the peak ring consists of shocked granitoid rocks (19 samples).
E. Le Ber, D. Loggia, N. Denchik, J. Lofi, D. A. Kring, P. Sardini, M. Siitari‐Kauppi, P. Pezard, G. Olivier, IODP‐ICDP Expedition 364 Science Party   +9 more
wiley   +1 more source

Sediment sequence at Muhos, western Finland – a window to the Pleistocene history of the Scandinavian Ice Sheet

Boreas, Volume 51, Issue 2, Page 332-349, April 2022., 2022
In this study, we analysed a ~54‐m sediment core consisting of Quaternary sediments overlying the Neoproterozoic Muhos Formation in central western Finland, adjacent to the Gulf of Bothnia. The sediments recovered were logged, and their sedimentological characteristics defined.
Tiina Eskola, Juha P. Lunkka
wiley   +1 more source

1.88 Ga granitoids at Sorsakoski, Central Finland: A-type magmatism within the Raahe-Ladoga suture zone [PDF]

Bulletin of the Geological Society of Finland
Four quartz monzonite – granite intrusions forming the Sorsakoski granite lithodeme, are found within the Raahe-Ladoga suture zone in Central Finland. The prevailing potassium feldspar megacrystic quartz monzonites and granites form a bimodal association
Perttu Mikkola, Maija Pietilä, O. Tapani Rämö, Hannu Huhma   +3 more
doaj   +1 more source

U‐Pb dating of zircon and monazite from the uplifted Variscan crystalline basement of the Ries impact crater

Meteoritics &Planetary Science, Volume 57, Issue 4, Page 830-849, April 2022., 2022
Abstract Impact crater central peaks and peak ring complexes are important exploration targets for future missions to other planetary bodies, because they provide access to material uplifted from lower crustal levels. Material exposed there could also provide chronological constraints on crater formation events. Therefore, it is essential to understand
Romain Tartèse, Stanley Endley, Katherine H. Joy   +2 more
wiley   +1 more source

Ice Nucleating Particle Connections to Regional Argentinian Land Surface Emissions and Weather During the Cloud, Aerosol, and Complex Terrain Interactions Experiment

Journal of Geophysical Research: Atmospheres, Volume 126, Issue 23, 16 December 2021., 2021
Abstract Here, we present a multi‐season study of ice‐nucleating particles (INPs) active via the immersion freezing mechanism, which took place in north‐central Argentina, a worldwide hotspot for mesoscale convective storms. INPs were measured untreated, after heating to 95°C, and after hydrogen peroxide digestion.
Baptiste Testa, Thomas C. J. Hill, Nicholas A. Marsden, Kevin R. Barry, Carson C. Hume, Qijing Bian, Jun Uetake, Hannah Hare, Russell J. Perkins, Ottmar Möhler, Sonia M. Kreidenweis, Paul J. DeMott   +11 more
wiley   +1 more source

Rapakivi K‐Feldspar Megacrysts in Monzogranitic Porphyry: Evidence for Magma Recharge and Mush Rejuvenation

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 12, December 2025.
Abstract The formation, storage, and evolution of granitic magmas are fundamental processes driving the growth of continental crust. While traditionally attributed to crystal fractionation in high‐melt fraction magma chambers, the model invoking low‐melt fraction crystal mushes has gained wide acceptance.
Wang Li, Xuxuan Ma, Roberto Weinberg, Liang Qiu, Zhiyong Zhu, Haibing Li   +5 more
wiley   +1 more source

Machine Learning Model for Assessing Melting Pressure Conditions of the TTG Genesis: Implications for the Timing of the Onset of Global Plate Tectonics

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 11, November 2025.
Abstract Understanding the pressure conditions of the formation of tonalite‐trondhjemite‐granodiorite (TTG) series rocks is important, as these rocks are key constituents of the Archean continental crust. However, the detailed pressure history of Archean TTG gneisses remains ambiguous due to uncertainties surrounding their sources and the effects of ...
Denggang Lu, Jia Liu, Qunke Xia, Zhikang Luan, Jingjun Zhou, Kailong Yang, Eero Hanski   +6 more
wiley   +1 more source

Local Climatic Effects on Colonisation and Extinction Drive Changes in Mountain Butterfly Communities

Diversity and Distributions, Volume 31, Issue 1, January 2025.
ABSTRACT Aim The capacity of cool refugia to protect cold‐adapted species against climate change may depend on both their initial climatic conditions and how quickly these change. We test how local climatic conditions influence mountain butterfly communities via their effects on colonisation and local extinction.
Guim Ursul, Mario Mingarro, Sara Castro‐Cobo, Juan Pablo Cancela, Helena Romo, Robert J. Wilson   +5 more
wiley   +1 more source