Filtering by Subject: Other Earth Sciences

Shallow storage conditions at Krafla IDDP-1 revealed by rhyolite-MELTS geobarometry, and implications for global shallow magmatism

Lydia Harmon, Guilherme Augusto Rosa Gualda, Blake Wallrich, et al.

Published: 2024-06-24
Subjects: Earth Sciences, Geochemistry, Geology, Other Earth Sciences, Volcanology

Identifying the storage depths of melt-dominated magma bodies prior to eruption is critical for understanding magma transport, eruption hazards, and magma body longevity. Rhyolite-MELTS has been used effectively to calculate pre-eruptive storage pressures for silicic magma bodies in the upper crust (~100-350 MPa), but its precision and accuracy in very low-pressure systems (<100 MPa) has not [...]

Unique composition and evolutionary histories of low velocity mantle domains

James Panton, J. Huw Davies, Paula Koelemeijer, et al.

Published: 2024-05-31
Subjects: Earth Sciences, Geophysics and Seismology, Other Earth Sciences, Physical Sciences and Mathematics

The two `large low velocity provinces' (LLVPs) are broad seismic wave speed anomalies in Earth's lower mantle beneath Africa and the Pacific Ocean. Recent research suggests they represent volumes that contain relatively dense subducted oceanic crust (SOC), but the distribution of recycled material within them is an open question. Using simulations of 3-D global-scale mantle circulation over the [...]

Permafrost thaw subsidence, sea-level rise, and erosion are transforming Alaska’s Arctic coastal zone

Roger Cameron Creel, Julia Guimond, Benjamin Jones, et al.

Published: 2024-05-10
Subjects: Earth Sciences, Geomorphology, Other Earth Sciences, Physical Sciences and Mathematics

Climate warming is causing rapid coastal change in the Arctic. Permafrost thaw subsidence, sea-level rise, and erosion each threaten the Arctic nearshore. These agents of change have received unequal attention and their compound impact remains poorly understood. Alaska's Arctic Coastal Plain (ACP) is ideal for addressing this knowledge gap due to the region’s relatively abundant observational [...]

Unique In-situ Measurements from Greenland Fjord Show Winter Freshening by Subglacial Melt

Karina Hansen, Nanna B Karlsson, Penelope How, et al.

Published: 2024-05-08
Subjects: Earth Sciences, Glaciology, Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Other Earth Sciences, Physical Sciences and Mathematics

The interaction between glacier fronts and ocean waters is one of the key uncertainties for projecting future ice mass loss. Direct observations at glacier fronts are sparse but studies indicate that the magnitude and timing of freshwater fluxes are crucial in determining fjord circulation, ice frontal melt and ecosystem habitability. Particularly wintertime dynamics are severely understudied due [...]

Evaluation of the METRIC and TSEB remote sensing evapotranspiration models in the floodplain area of the Thaya and Morava Rivers

Tomas Ghisi, Milan Fischer, Héctor Nieto, et al.

Published: 2024-04-24
Subjects: Hydrology, Other Earth Sciences, Other Forestry and Forest Sciences

Study region: Floodplain ecosystem region at the confluence of the Morava and Thaya Rivers, Czech Republic. Study focus: Accurate determination of actual evapotranspiration (ETa) is essential for understanding surface hydrological conditions. The aim of this study was to evaluate two remote sensing models, METRIC and TSEB, for estimating ETa and energy fluxes in two ecosystems using the eddy [...]

The influence of a sub-lithospheric layer width on the partitioning of the induced mantle flow, surface motions and subduction dynamics

Roberta Carluccio, Louis N. Moresi, Fabio Capitanio, et al.

Published: 2024-04-17
Subjects: Geophysics and Seismology, Other Earth Sciences, Planetary Geology, Tectonics and Structure

The partitioning of the three-dimensional mantle flow into toroidal and poloidal components is a diagnostic element to characterise tectonics regimes, with both fields being substantially active and representative of the contemporary mode of mantle convection. The toroidal:poloidal ratio (T/P) affects several aspects of mantle circulation, including the sinking of the subducting lithosphere into [...]

Grüneisen parameter formalism in the study of the Earth's core formation: a sensitivity study

Vincent Clesi, Renaud Deguen

Published: 2024-03-21
Subjects: Condensed Matter Physics, Earth Sciences, Geochemistry, Geology, Mineral Physics, Other Earth Sciences, Planetary Geophysics and Seismology, Planetary Mineral Physics, Planetary Sciences

The Grüneisen parameter is an important parameter for the thermal state and evolution of the core, but its uncertainties and their implications are sometimes overlooked . Several formalisms using different parameters values have been used in different studies, making comparison between studies difficult. In this paper, we use previously published datasets to test the sensitivity of modeling the [...]

The role of salt diapirism in controlling the sedimentology and distribution of deep-water deposits, Pierce Field, East Central Graben, North Sea

Clara Abu, Christopher Aiden-Lee Jackson

Published: 2024-03-04
Subjects: Earth Sciences, Geology, Other Earth Sciences, Sedimentology, Tectonics and Structure

Passively rising diapirs control flank deformation (i.e., within 1 km of the salt-sediment interface) and resultant stratigraphic architecture of syn-kinematic units. Growth strata associated with deformation at the flanks of passive diapirs are known as halokinetic sequences. Very few studies have conducted an integrated analysis of composite halokinetic sequences, CHS (stacked halokinetic [...]

Precise estimation of the GPS To Galileo Time Offset: an experimental setup and its associated processing method

Pierre Sakic, Edmond Saint-Denis, Solène Thevenet, et al.

Published: 2024-02-15
Subjects: Aerospace Engineering, Earth Sciences, Geophysics and Seismology, Navigation, Guidance, Control and Dynamics, Other Earth Sciences, Other Engineering

Although the satellite navigation systems are all in their definition based on the international atomic time (TAI), each system has its own realization. There is therefore a difference, variable in time, between different realizations of the same time systems. Thus, the time of the GPS (GPST) and Galileo (Galileo System Time, GST) systems differ in their realization by some nanoseconds. This [...]

An aminostratigraphy for the Quaternary of the Swiss Plateau

Kirsty Penkman, Nigel Thew, Samantha Presslee, et al.

Published: 2024-02-08
Subjects: Analytical Chemistry, Earth Sciences, Geochemistry, Other Earth Sciences, Stratigraphy

Here we develop an amino acid chronology to help establish a dated sequence for the important Early Pleistocene Höhere and Tiefere Deckenschotter lithostratigraphic units, as well as other Quaternary deposits from the Swiss Plateau. Age discrimination is possible between the Quaternary sites from the Swiss Plateau in six different biominerals: Bithynia opercula, shell fragments from Fruticola, [...]

A new structure determination of the magnesium phosphate mineral struvite (MgNH4PO4· 6H2O) at 100 K

Rebecca Volkmann, Marie Münchhalfen, Liane G. Benning

Published: 2024-01-17
Subjects: Other Earth Sciences, Physical Sciences and Mathematics

The magnesium phosphate mineral struvite (MgNH4PO4·6H2O) is of interest for the recovery of phosphorus from wastewaters and for use as a fertilizer in agriculture, yet its structure is still debated. The structure of synthetic single crystals of struvite was characterized through refinement of a single-crystal X-ray diffraction pattern acquired at 100 K with the positions of all hydrogen atoms [...]

Deep learning with simulated laser scanning data for 3D point cloud classification

Alberto M. Esmorís, Hannah Weiser, Lukas Winiwarter, et al.

Published: 2024-01-16
Subjects: Artificial Intelligence and Robotics, Computer Sciences, Earth Sciences, Numerical Analysis and Scientific Computing, Other Earth Sciences

Laser scanning is an active remote sensing technique applied in many disciplines to acquire state-of-the-art spatial measurements. Semantic labeling is often necessary to extract information from the raw point cloud. Deep learning methods constitute a data-hungry solution for the semantic segmentation of point clouds. In this work, we investigate the use of simulated laser scanning for training [...]

Microbial indicators and detection of Cu-sulfide ore mineralization

Bianca Patrizia Iulianella Phillips, rachel simister, Shane D Rich, et al.

Published: 2024-01-02
Subjects: Biogeochemistry, Earth Sciences, Geochemistry, Geology, Other Earth Sciences, Physical Sciences and Mathematics, Soil Science

Rapid electrification of society is placing unprecedented demand on critical mineral and metal resources. New strategies and technologies are thus needed to promote mineral discovery in regions where deposits are likely buried deep under soil and glacial till. We show that microbial communities from different soil types change in composition in response to amendment with copper. We also show [...]

Quantifying mantle mixing through configurational Entropy

Erik van der Wiel, Cedric Thieulot, Douwe J.J. van Hinsbergen

Published: 2023-11-09
Subjects: Geophysics and Seismology, Other Earth Sciences

Geodynamic models of mantle convection provide a powerful tool to obtain insights into the structure and composition of the Earth’s mantle that resulted from a long history of differentiating and mixing. Comparing such models with geophysical and geochemical observations is challenging as these datasets often sample entirely different temporal and spatial scales. Here, we explore the use of [...]

Changes in mesophotic carbonate-platform export across the end of the last glacial cycle (Saya de Malha Bank, western Indian Ocean)

Or M. Bialik, Christian Betzler, Juan Carlos Braga Alarcón, et al.

Published: 2023-11-07
Subjects: Biogeochemistry, Geochemistry, Natural Resources and Conservation, Other Earth Sciences, Other Environmental Sciences, Paleobiology, Sedimentology, Stratigraphy

The export of neritic material from the top of carbonate platforms is a key process in the construction of their slopes. However, our knowledge of the supply pattern of materials from platforms is dominantly based on platforms lying in the euphotic zone during the present sea-level highstand. This is a somewhat biased perspective as through geological time not all platforms were euphotic. The [...]


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