Article
Geochemistry & Geophysics
Felix Gervais, Alexandre Beaudry, Charles Kavanagh-Lepage, Abdelali Moukhsil, Kyle P. Larson, Carl Guilmette
Summary: This passage discusses an enigmatic period in Earth's evolution known as the "boring billion," which has been viewed as a time of tectonic quiescence. However, the geological record has generated differing interpretations, leading to confusion. By compiling multidisciplinary geological datasets, the authors present a new model suggesting that the period involved the assembly of a distinct continent through the amalgamation of mature oceanic arcs/back-arcs, resolving contradictions between tectonic proxies and the geological record and confirming the excitement of the Mesoproterozoic Era.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geosciences, Multidisciplinary
N. Rosing-Schow, R. L. Romer, A. Mueller, F. Corfu, R. Skoda, H. Friis
Summary: Most pegmatites in southern Norway are not highly evolved residual melts derived from granites, but rather formed from anatectic melting of metamorphic rocks during the Sveconorwegian orogeny. New age data for thirteen pegmatites and one granite support this hypothesis, showing two age groups of Sveconorwegian pegmatites: Group 1 (1100-1030 Ma) and Group 2 (930-890 Ma). The age difference between pegmatites and adjacent granites, as well as field evidence, suggests an anatectic origin for these pegmatites.
PRECAMBRIAN RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Christopher Harrison, Marc R. St-Onge
Summary: The geological history of the Arctic is shaped by the assembly and breakup of three supercontinents, namely Nuna (Columbia), Rodinia, and Pangea. The formation and breakup of these supercontinents have had significant impacts on the geological formations in the Arctic region.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2023)
Article
Geosciences, Multidisciplinary
Andrew S. Merdith, Simon E. Williams, Alan S. Collins, Michael G. Tetley, Jacob A. Mulder, Morgan L. Blades, Alexander Young, Sheree E. Armistead, John Cannon, Sabin Zahirovic, R. Dietmar Mueller
Summary: Recent progress in plate tectonic reconstructions has expanded beyond continental drift to reconstruct the full evolving configuration of tectonic plates and plate boundaries. A continuous full-plate model spanning 1 billion years to present-day has been developed, incorporating a revised model for the Neoproterozoic-Cambrian period and connecting it with models of the Phanerozoic. The model is geologically constrained and based on preserved data from past plate boundaries, with the goal of providing a detailed and self-consistent tectonic reconstruction for the last billion years of Earth's history.
EARTH-SCIENCE REVIEWS
(2021)
Article
Multidisciplinary Sciences
Eivind O. Straume, Aleksi Nummelin, Carmen Gaina, Kerim H. Nisancioglu
Summary: This study examines the climatic impact of oceanic gateway changes during the Eocene-Oligocene Transition and reveals their controlling role in the growth of land-based ice sheets. The Northeast Atlantic gateways and decreasing atmospheric CO2 played a critical role in the onset of glaciations in both hemispheres.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Geosciences, Multidisciplinary
Guanghui Wu, Shuai Yang, Wei Liu, R. Damian Nance, Xin Chen, Zecheng Wang, Yang Xiao
Summary: The study suggests that during the Neoproterozoic period, there was a change in the subduction style of the Tarim Craton, transitioning from advancing to retreating subduction, which may be related to the breakup of Rodinia.
GEOSCIENCE FRONTIERS
(2021)
Article
Geosciences, Multidisciplinary
Wen Zhang, Fulai Liu, Chaohui Liu
Summary: Late Paleoproterozoic to early Neoproterozoic strata in the Liao-Ji area provide a significant record of sediment provenance transition from the North China Craton to the Grenvillian orogeny. Detrital zircon spectra document the change in sediment sources over time.
PRECAMBRIAN RESEARCH
(2021)
Article
Geology
Lauro Cezar M. De Lira Santos, Roberto G. de Oliveira, Geysson de A. Lages, Elton L. Dantas, Fabricio Caxito, Peter A. Cawood, Reinhardt A. Fuck, Haroldo M. Lima, Glenda L. Santos, Jose F. de Araujo Neto
Summary: The Borborema Province in NE Brazil is part of a large Neoproterozoic orogenic system related to the assembly of West Gondwana. The evolution of this province is contentious due to multiple overprinted events. A compilation of geological, isotopic, and geophysical data supports a terrane accretion model for the Transversal subprovince within the Borborema Province, revealing different terranes with varied ages and nature as evidence of accretion.
INTERNATIONAL GEOLOGY REVIEW
(2022)
Article
Geosciences, Multidisciplinary
Fabricio Andrade Caxito, Camila Franco Basto, Lauro Cezar Montefalco de Lira Santos, Elton Luiz Dantas, Vladimir Cruz de Medeiros, Tatiana Goncalves Dias, Vitor Barrote, Steffen Hagemann, Ana Ramalho Alkmim, Cristiano Lana
Summary: The new data on rhyolitic metavolcanic and metavolcaniclastic rocks in NE Brazil provide insights into widespread arc-related phenomena during the Neoproterozoic, with major magmatic activities occurring around 635-600 Ma. The rocks are mostly calc-alkaline, magnesian, and peraluminous, with specific geochemical signatures such as LREE enrichment.
Article
Geosciences, Multidisciplinary
A. Bird, M. Thirlwall, R. A. Strachan, I. L. Millar, E. D. Dempsey, K. Hardman
Summary: The presence of eclogites within continental crust is a crucial indication of collisional orogenesis. Redating the eclogites in the Eastern Glenelg basement inlier of the Northern Highland Terrane provides more accurate constraints on the timing of the Grenville Orogen collision. The results suggest that the onset of continent-continent interaction occurred around 1200 Ma, and the amalgamation of the Northern Highland Terrane with the Laurentian foreland happened around 1000 Ma at the terminal stages of the Grenville collision.
GEOSCIENCE FRONTIERS
(2023)
Article
Geosciences, Multidisciplinary
Igor Soejono, Vojtech Janousek, Vit Peresty, Karel Schulmann, Martin Svojtka, Pavel Hanzl, John M. Hora, Jitka Mikova, Pavla Stipska, Alexandra Guy, Stephen Collett, Dorjsuren Otgonbaatar
Summary: A study on the magmatic record in the Zavkhan Block, part of the Mongolian Collage in the Central Asian Orogenic Belt, revealed two distinct magmatic events in the region, Late Tonian (c. 840-800 Ma) and Cambro-Ordovician (c. 510-470 Ma). These events represent different sources and evolution processes of the crust, indicating the breakup of Rodinia and the development of a continental magmatic-arc system during the Cambro-Ordovician.
Article
Geosciences, Multidisciplinary
Fenglin Chen, Xiaozhuang Cui, Shoufa Lin, Jian Wang, Guangming Ren, Kuizhou Li, Mingda Huang, Zhiming Sun, Shilei Liu, Peng Wang, Weihua Pang
Summary: In this study, a comprehensive dataset of geochronology, whole-rock geochemistry, and Sr-Nd-Hf isotopic compositions was used to investigate the early Neoproterozoic tectonic process of South China. The results suggest the existence of mafic magmatism in the earliest Neoproterozoic, with diabases showing geochemical characteristics similar to Nb-enriched basalts. The integration of previous studies and the new findings propose that the southwestern Yangtze Block evolved from an intracontinental rift to a passive continental margin, followed by the development of a continental arc-back-arc basin system in the earliest Neoproterozoic.
PRECAMBRIAN RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Alexander B. Kuzmichev, Maria K. Danukalova
Summary: Several fold belts, including the Verkhoyansk-Chukotka fold belt, shape the structure of the Laptev Sea region. The Verkhoyansk fold belt occupies most of the Laptev Sea shelf and is folded in an orocline shape. The region's geological history can be traced through Permian rocks and shows the collision of Siberia with Baltica in different periods.
EARTH-SCIENCE REVIEWS
(2023)
Article
Geochemistry & Geophysics
Daniele Thallner, Andrew J. Biggin, Henry C. Halls
Summary: Long-term variations of the geomagnetic field, particularly during the Ediacaran period, provide insights into the evolution of Earth's deep interior. Palaeointensity data from the Grenville Dykes suggest the presence of an equatorial dipole in the geomagnetic field around 585 Ma.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Jinyu Zhang, Peter Flaig, Marwan Wartes, Jennifer Aschoff, Mark Shuster
Summary: The study developed a methodology that integrates stratigraphic forward modelling and inversion analysis to identify sediment source areas, which was tested on deposits of the Colville Basin in northern Alaska. The results show that Cretaceous sediments in the Colville Basin were mainly sourced from the Herald Arch, Chukchi Platform, and western Brooks Range Orogenic Belt, in line with previous provenance studies.
Article
Geochemistry & Geophysics
Xin Chen, Hans-Peter Schertl, Emma Hart, Jaroslaw Majka, Aitor Cambeses, David Hernandez-Uribe, Youye Zheng
Summary: The behavior of Ti-Nb-Ta in island arc magmatism is crucial. However, the mobilization and fractionation process of Ti-Nb-Ta in subduction zone settings is not well understood. This study focuses on felsic veins rich in coarse-grained rutile within retrograde eclogite to investigate the formation and alteration of rutile, as well as the mobility and fractionation of Ti-Nb-Ta during fluid/melt-rock interaction. The results reveal variations in the properties of rutile depending on its host rock, trace element signature, and genetical connection to ilmenite. The study also demonstrates the importance of volume diffusion in the extreme fractionation of high field strength elements and age variation of rutile at the mineral scale.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
Katarzyna Walczak, Grzegorz Ziemniak, Christopher Barnes, Riccardo Callegari, Michal Bukala, Melanie Kielman-Schmitt, Anna Zagorska, Jaroslaw Majka
Summary: This study expands the knowledge about the Neoproterozoic metamorphic history of the Baltoscandian margin in the northern Scandinavian Caledonides. The research reveals that the studied rocks underwent high-grade metamorphism in the Ediacaran and lack obvious evidence for Caledonian high-pressure metamorphism.
Article
Geosciences, Multidisciplinary
Karolina Goluchowska, Abigail K. Barker, Maciej Manecki, Karolina Kosminska, Robert M. Ellam, Jakub Bazarnik, Karol Faehnrich, Jerzy Czerny, Jaroslaw Majka
Summary: Late Neoproterozoic metavolcanic rocks along the Southwest coast of Svalbard were influenced by continental magmatism, and potential sources of crustal contamination were assessed. The study found that the metavolcanic rocks in the South experienced a higher degree of contamination, while those in the North were influenced by carbonate and shale.
PRECAMBRIAN RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Stanislaw Mazur, Jaroslaw Majka, Christopher J. Barnes, William McClelland, Michal Bukala, Marian Janak, Karolina Kosminska
Summary: This study used 40Ar/39Ar dating to determine the ages of white mica in the Caledonian orogen of NW Svalbard. The results reveal that the oldest age represents the cooling age, while the other ages indicate the timing of subsequent deformation associated with the Caledonian nappe stack.
Article
Geology
Jaroslaw Majka, Adam Wlodek, Erik Jonsson, Karin Hogdahl
Summary: Three types of secondary coronas were found around monazite in altered metavolcanic rocks associated with the Palaeoproterozoic apatite-iron oxide ore deposit. These coronas contain unique mineral assemblages and are spatially close to each other.
Article
Geosciences, Multidisciplinary
Chong Ma, Jaroslaw Majka, Jeffrey A. Benowitz, Christopher Barnes, Hakan Sjostrom, David G. Gee, Mark G. Steltenpohl
Summary: This study presents a typical example of the complex exhumation process of deeply subducted continental rocks in orogenic belts. Through analyzing the structural and chronological data of the SNC in central Jamtland, Sweden, the study summarizes four stages of exhumation. This research is important for understanding the exhumation process of deeply subducted continental rocks in orogenic belts.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2022)
Article
Geochemistry & Geophysics
Lorraine Tual, Matthijs A. Smit, Jamie Cutts, Ellen Kooijman, Melanie Kielman-Schmitt, Jaroslaw Majka, Ian Foulds
Summary: Explore the timing and rate of subduction-zone metamorphism and H2O release by studying the compositional changes of garnet in blueschists and eclogites. A new protocol using low-loss micro-sampling by laser cutting combined with Lu-Hf chronology is developed. The study reveals extremely fast, pulsed garnet growth and near-instantaneous fluid release reactions in subduction zones.
Article
Geology
Pauline Jeanneret, Iwona Klonowska, Christopher Barnes, Jaroslaw Majka, Johanna Holmberg, Mattia Gillio, William Nachlas, Matteo Alvaro, Karolina Kosminska, Henning Lorenz, Thomas Zack, Anna Ladenberger, Hemin Koyi
Summary: The tectonometamorphic evolution of the Lower Seve Nappe in the Scandinavian Caledonides was characterized using various P-T estimation techniques. The results show that quartz inclusions in garnet provide critical data to constrain the evolutionary path of the metasedimentary rocks.
JOURNAL OF METAMORPHIC GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Jakub Bazarnik, Karolina Kosminska, William C. McClelland, Justin Strauss, Karsten Piepjohn, Synnove Elvevold, Grzegorz Zielinska, Jaroslaw Majka
Summary: New analytical data and petrographic observations show that both the Mosselhalvoya Group and the Atomfjella Complex experienced two-stage metamorphism under similar pressure-temperature (P-T) conditions. This suggests that the boundary between them is more likely a subordinate thrust fault within the Atomfjella thrust stack, rather than a major boundary separating the Nordaustlandet and West Ny-Friesland terranes.
CANADIAN JOURNAL OF EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
C. J. Barnes, J. Majka, R. Callegari, K. Walczak, G. Ziemniak, M. Bukala
Summary: In this study, the upper gneiss unit in the northernmost Seve Nappe Complex (SNC) in the Scandinavian Caledonides was investigated. The unit underwent exhumation at c. 459 Ma and deformation and fluid infiltration at c. 434 Ma. These events are similar to the deformation histories of other northern SNC terranes, indicating oblique, south-to-north subduction in the Baltic region during the late Cambrian.
JOURNAL OF THE GEOLOGICAL SOCIETY
(2023)
Article
Geology
Maria Maraszewska, Jaroslaw Majka, Daniel E. Harlov, Maciej Manecki, David A. Schneider, Igor Broska, Per-Inge Myhre
Summary: A set of small iron oxide-apatite (IOA) ore bodies have been discovered in a crustal shear zone in Prins Karls Forland, Svalbard Archipelago. These ore bodies have undergone multi-stage tectonothermal and metasomatic processes, resulting in various styles of deformation and distinct mineral assemblages. The ores were formed through the alteration of apatite and subsequent deposition of monazite and xenotime, with the transport of dissolved REE and P likely enhanced by deformation. The involvement of compositionally different fluids during the tectonothermal evolution of Prins Karls Forland suggests that these IOA ore bodies resulted from the fractionation of Fe, P, Ca, and REE from hypersaline fluids associated with gabbroic rocks.
ORE GEOLOGY REVIEWS
(2023)
Article
Geochemistry & Geophysics
Karolina Kosminska, Kathrin Fassmer, William C. McClelland, Jaroslaw Majka, Matthew Coble, Jay Thomas, Maciej Manecki, Henning Lorenz, Jakub Bazarnik, Carsten Muenker
Summary: The study investigates the presence of monazite in high-pressure low-temperature rocks and its forming reaction using pressure-temperature estimates and dating techniques. Monazite in the eclogite is believed to have formed under high-pressure conditions due to the decomposition of accessory phases, while monazite in the blueschist reflects the prograde growth of garnet. The results provide evidence for an early Ordovician subduction system and support the mixed provenance of southwestern Svalbard.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2023)
Article
Geochemistry & Geophysics
Maciej Jaranowski, Bartosz Budzyn, Christopher J. J. Barnes, Jaroslaw Majka, Jiri Slama, Gabriela A. A. Kozub-Budzyn, Karolina Kosminska
Summary: This study investigated the petrochronological records of eclogites in the Scandinavian Caledonides by using EPMA and LA-ICPMS to determine the U-Pb geochronology of zircon and apatite. The results showed that different eclogite samples have different age records, and the trace element characteristics of apatites can provide valuable information about the growth, metamorphism, and U-Pb age records of the rocks.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2023)
Article
Geology
Christopher J. Barnes, David A. Schneider, Jaroslaw Majka, Alfredo Camacho, Michal Bukala, Adam Wlodek
Summary: In this study, in situ laser ablation and single-grain fusion Ar-40/Ar-39 geochronological techniques were compared using white mica from the Vaimok Lens of the Seve Nappe Complex in the Scandinavian Caledonides. The results show that the Ar-40/Ar-39 dates are not solely controlled by bulk deformation intensities and structural generations, but also influenced by white mica strain localization.
JOURNAL OF METAMORPHIC GEOLOGY
(2023)