Preprints
There are 5476 Preprints listed.
Reconciling the Cretaceous breakup and demise of the Phoenix Plate with East Gondwana orogenesis in New Zealand
Published: 2022-10-26
Subjects: Physical Sciences and Mathematics
Following hundreds of millions of years of subduction in all circum-Pacific margins, the Pacific Plate started to share a mid-ocean ridge connection with continental Antarctica during a Late Cretaceous south Pacific plate reorganization. This reorganization was associated with the cessation of subduction of the remnants of the Phoenix Plate along the Zealandia margin of East Gondwana, but [...]
Short Communication: The Wasserstein distance as a dissimilarity metric for comparing detrital age spectra, and other geological distributions
Published: 2022-10-26
Subjects: Earth Sciences, Environmental Sciences, Geochemistry, Geology, Geomorphology, Stratigraphy, Tectonics and Structure
Distributional data such as detrital age populations or grain size distributions are common in the geological sciences. As analytical techniques become more sophisticated, increasingly large amounts of distributional data are being gathered. These advances require quantitative and objective methods, such as multidimensional scaling (MDS), to analyse large numbers of samples. Crucial to such [...]
palaeoverse: a community-driven R package to support palaeobiological analysis
Published: 2022-10-26
Subjects: Geology, Paleobiology, Paleontology
1. The open-source programming language ‘R’ has become a standard tool in the palaeobiologist’s toolkit. Its popularity within the palaeobiology community continues to grow, with published articles increasingly citing the usage of R and R packages. However, there are currently a lack of agreed standards for data preparation and available frameworks to support implementation of such standards. [...]
Impact-based probabilistic modeling of hydro-morphological processes in China (1985-2015)
Published: 2022-10-26
Subjects: Geomorphology
Hydro-morphological processes (HMP, any natural phenomenon contained within the spectrum defined between debris flows and flash floods) pose a relevant threat to infrastructure, urban and rural settlements and to lives in general. This has been widely observed in recent years and will likely become worse as climate change will influence the spatio-temporal pattern of precipitation events. The [...]
Experimental comparisons of carbonate-associated sulfate extraction methods
Published: 2022-10-26
Subjects: Biogeochemistry, Earth Sciences, Geochemistry, Geology, Physical Sciences and Mathematics
Carbonate-associated sulfate (CAS) refers to trace amounts of sulfate incorporated into carbonate minerals during precipitation. CAS has been the most commonly used approach to recover the paleo-seawater sulfate sulfur isotope composition (δ34Ssw) as carbonate rocks are more common and occur in less restricted marine environments than alternative sulfate-bearing minerals (such as gypsum and [...]
Efficiently Simulating Lagrangian Particles in Large-Scale Ocean Flows – Data Structures and their Impact on Geophysical Applications
Published: 2022-10-26
Subjects: Fluid Dynamics, Numerical Analysis and Scientific Computing, Oceanography
Studying oceanography by using Lagrangian simulations has been adopted for a range of scenarios, such as the determining the fate of microplastics in the ocean, simulating the origin locations of microplankton used for palaeoceanographic reconstructions, for studying the impact of fish aggregation devices on the migration behaviour of tuna. These simulations are complex and represent a [...]
Integrated field, model, and theoretical advances inform a predictive understanding of transport and transformation in the critical zone
Published: 2022-10-26
Subjects: Hydrology
Dr. Kamini Singha’s work has been transformative in advancing our predictive understanding of transport and transformation in Earth’s critical zone. She integrates empirical, numerical, and theoretical advances at scales spanning individual pores to regional aquifers, and works seamlessly across disciplines to connect otherwise disparate fields. Her work has both applied and basic research [...]
A decade of in situ cosmogenic 14C in Antarctica
Published: 2022-10-26
Subjects: Physical Sciences and Mathematics
Cosmogenic nuclide measurements in glacial deposits extend our knowledge of glacier chronologies beyond the observational record. The short half-life of in situ cosmogenic 14C makes it particularly useful for studying glacier chronologies, as resulting exposure ages are less sensitive to nuclide inheritance when compared with more commonly measured, long-lived nuclides. An increasing number [...]
Restricted rupture evolution of the 2022 Mw 6.7 Luding China earthquake
Published: 2022-10-25
Subjects: Earth Sciences, Physical Sciences and Mathematics
On September 5, 2022, a strike-slip earthquake with a moment magnitude (Mw) 6.7 occurred along the Moxi segment of the Xianshuihe fault zone in Luding, Sichuan province, China. To estimate the rupture evolution of the 2022 Luding earthquake, we inverted teleseismic P-waves by applying the Potency Density Tensor Inversion, a novel method that can estimate fault geometry and source process. We [...]
Global ocean dimethylsulfide photolysis rates quantified with a spectrally and vertically resolved model
Published: 2022-10-24
Subjects: Oceanography and Atmospheric Sciences and Meteorology
Photochemical reactions initiated by ultraviolet (UV) radiation remove the climate-active gas dimethylsulfide (DMS) from the ocean’s surface layer. Here we quantified DMS photolysis using a satellite-based model that accounts for spectral irradiance attenuation in the water column, its absorption by chromophoric dissolved organic matter (CDOM), and the apparent quantum yields (AQYs) with which [...]
Sedimentological Characteristics, and Provenance of the Late Cretaceous Sediment in the Eastern Dahomey Basin
Published: 2022-10-24
Subjects: Physical Sciences and Mathematics
Field studies of outcrop samples from part of the Dahomey basin, southeastern Nigeria, were investigated to unravel the lithofacies distribution and provenance of the basin. Granulometric analysis of the sandstone facies of the Araromi Formation has been studied. Histograms of the sediments exhibit both unimodal and bimodal trends. The cumulative curve of the studied samples Is typical of fluvial [...]
GEOCHEMICAL AND MINERALOGICAL STUDY OF THE CRETACEOUS SEDIMENTS IN KERI KERI, FIKA, GONGILA, AND BIMA SANDSTONE FORMATION BORNU BASIN, NORTH-EASTERN NIGERIA
Published: 2022-10-24
Subjects: Physical Sciences and Mathematics
The mineralogical and geochemical composition of Cretaceous and Tertiary sediments of the Bornu Basin, northeastern Nigeria penetrated by Kanadi Wells, have been studied towards deducing aspects of their derivation and deposition. The sediments comprising the Bima Sandstone Formation, sandy-shale Gongila Formation, and, clayey and shaley Fika Formation are mainly composed of quartz (35-58%) and [...]
GEOCHEMICAL SURVEY AND POTENTIAL MINERALIZATION INVESTIGATION OF ILERO AND ITS ENVIRONS OYO STATE, NIGERIA
Published: 2022-10-24
Subjects: Physical Sciences and Mathematics
Ilero and its environs are part of the Kajola local Government area, Oyo State, and fall within the basement complex of southwestern Nigeria. The research work was focused on the geological mapping of the area and the study of the different rock and minerals units to determine the mineral resources of the area using petrographic, geochemical, and XRD analysis. The geochemical analysis showed the [...]
Effective leaching of argillaceous and dolomitic carbonate rocks for strontium isotope stratigraphy
Published: 2022-10-24
Subjects: Earth Sciences
Various methods have been developed to extract a primary seawater Sr isotope signal from carbonate rocks for strontium isotope stratigraphy. However, there is little consensus around the best method due to variable sample purity and mineralogy. For this study, we applied sequential leaching to a range of rock samples, in order to explore strontium isotope leaching systematics of less favoured [...]
Fisher Discriminant Analysis for Extracting Interpretable Phenological Information from Multivariate Time Series Data
Published: 2022-10-24
Subjects: Applied Statistics, Environmental Engineering, Environmental Monitoring, Environmental Sciences, Remote Sensing
For many applications in environmental remote sensing, the interpretation of a given measurement depends strongly on what time of year the measurement was taken. This is particularly the case for phenology studies concerned with identifying when plant developmental transitions occur, but it is also true for a wide range of applications including vegetation species classification, crop yield [...]