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Bureau of Economic Geology, John A. and Katherine G. Jack

Here, we present a new CO 2 record across the past 23 m.y. of Earth history based on the δ 13 C value of terrestrial C 3 plant remains, using a method applicable to the entire ∼400 m.y. history of C 3 photosynthesis on land. Across the past 23 m.y., CO 2 likely ranged between ∼230 ppmv and 350 ppmv (68% confidence interval: ∼170–540 ppm).Together with a drastic increase of the dinoflagellate cyst Apectodinium spp. abundance (Crouch et al., 2001) and a generalized dissolution of carbonates, it has been interpreted that large amounts of 13 C-depleted carbon had been released into the oceans and the atmosphere (Dickens et al., 1997).The distinctive CIE has been identified in a …Mining of “invisible gold” associated with sulfides in gold ores represents a significant proportion of gold production worldwide. Gold hosted in sulfide minerals has been proposed to be structurally bound in the crystal lattice as a sulfide-gold alloy and/or to occur as discrete metallic nanoparticles.Play the new geology based daily word game from academic publisher GeoScienceWorld! Play the new geology based daily word game from academic publisher GeoScienceWorld! GeoScienceWord. Q W E R T Y U I O P. A S D F G H J K L. Enter Z X C V B N M Delete How to play. Guess the word in 6 tries. After each guess, the color of the tiles will change to ...Temporal Separation of W and Sn Mineralization by Temperature-Controlled Incongruent Melting of a Single Protolith: Evidence from the Wangxianling Area, Nanling Region, South ChinaAbout GSW. GeoScienceWorld (GSW) is a nonprofit collaborative and comprehensive resource for research and communications in the Earth Sciences. GSW works with societies, institutions, and researchers around the world and provides a single source of access to more than 50 preeminent scholarly journals, 2,200+ eBooks, and over 4.5 million GeoRef ...The iron oxide copper-gold (IOCG) group of deposits, initially defined following discovery of the giant Olympic Dam Cu-U-Au deposit, has progressively become too-embracing when associated deposits and potential end members or analogs are included.Play the new geology based daily word game from academic publisher GeoScienceWorld! Play the new geology based daily word game from academic publisher GeoScienceWorld! GeoScienceWord. Q W E R T Y U I O P. A S D F G H J K L. Enter Z X C V B N M Delete How to play. Guess the word in 6 tries. After each guess, the color of the tiles will change to ...This special volume provides a comprehensive review of the current state of knowledge for rare earth and critical elements in ore deposits. The first six chapters are devoted to rare earth elements (REEs) because of the unprecedented interest in these elements during the past several years.Southern Türkiye faced widespread catastrophic destruction by two devastating earthquakes on the same day. As the earthquakes occurred at 04:17 (M w = 7.7, Pazarcık, Kahramanmaraş) and 12:30 (M w = 7.6, Elbistan, Kahramanmaraş) on 6 February 2023, neighbouring active fault systems were broken in succession between the Hatay and Malatya provinces in the region.Connecting Geology and Sustainability. By Pheobe McMellon December 15, 2021. A geoscientist’s understanding and knowledge of the earth and its complex processes, runs deep, extends over vast periods of time, through multiple mass extinctions, and catastrophic events. This knowledge can easily be leveraged and applied to ensure that we are ...Carbonatites, the most silica-poor igneous rocks, have a close relationship with rare earth element (REE) ore deposits, where low SiO 2 activity is considered to contribute to economic REE mineralization. However, a paradox is raised by quartz, commonly regarded as a Si-saturation proxy, which occurs in some giant carbonatites or …In this article, the outcomes of a research cooperation between Politecnico di Milano, Italy, and Munich RE, Germany, aiming to improve ground‐motion estimation in the Istanbul area through 3D physics‐based numerical simulations (PBSs), are illustrated.GeoScienceWorld (GSW) – платформа единого доступа к научным журналам, электронным книгам и широкому спектру исследований в области наук о Земле со ...Published Special Issues. A Special Issue is a collection of articles that concentrates on a hot topical research area. These issues provide a venue for research on emerging areas, highlight important subdisciplines, or describe new cross-disciplinary applications. Propagation and Distribution of Induced Fractures from Hydraulic Fracturing in ...Apatite is a common resistate mineral occurring in a range of host rocks and ore-related hydrothermal alteration assemblages. Apatite in several porphyry copper deposits in British Columbia has a unique set of physical and compositional characteristics that can be used to evaluate the chemical conditions of magmas that formed the …93-5 Big Data Problems in Seismology (Guest Editors: Daniel T. Trugman; Lihua Fang; Jonathan Ajo‐Franklin; Avinash Nayak; Zefeng Li) 93-2A Puerto Rico Seismicity, Tectonics and the 2020 M 6.4 Earthquake Sequence (Guest Editors: Elizabeth Vanacore, Christa von Hillebrandt Andrade, Daniel Edward MaNamara) 92-5 Arctic and Antarctic Earthquakes ...Application of sequence-stratigraphic analysis depends on the recognition of a hierarchy of stratal units including beds, bedsets, parasequences, parasequence sets, and sequences bounded by chronostratigraphically significant surfaces of erosion, nondeposition, or their correlative surfaces. GeoScience World · Connect. Alternative Title: GSW | GeoScienceWorld. Allowable Uses: Access is available on and off campus to current McMaster University ...Browse Issues. Full-text available for all issues. 2023 Volume 118, Numbers 1 - 6. 2022 Volume 117, Numbers 1 - 8. 2021 Volume 116, Numbers 1 - 8. 2020 Volume 115, Numbers 1 - 8. 2019 Volume 114, Numbers 1 - 8. 2018 Volume 113, Numbers 1 - …71 Engineering geological mapping for civil engineering practice in the United Kingdom. 49 The influence of weathering on index properties and undrained shear strength for the …Your Trusted Source for Earth Science Research GeoScienceWorld (GSW) is an essential resource for anyone that relies on high-quality, peer-reviewed geoscience content. As a unique nonprofit collaborative, our mission is to advance and promote the science that binds our community together. Our Products Research Platform An integrated collection of 53 journals and 2,280+ books from...The Upper Cretaceous petroleum system of the East Beni Suef Basin, Egypt: an integrated geological and 2D basin modelling approach. Characterization of silicification and dissolution zones by integrating borehole image logs and core samples: a case study of a well from the Brazilian pre-salt. Seismic stratigraphy of the southern Eratosthenes ...Two Millennia of Climate History for the Russian Altai: Integrated Reconstruction from Lake Sediment Data. Mineral–Geochemical and Geotectonic Features of the Lotmvara-II Ultrabasic Sill, Serpentinite Belt (Kola Peninsula) Preservation of Soft-Bodied Organisms in Early Cambrian Carbonates. The Bouvet Plume: Parameters, Evolution, and ...We derive a new earthquake focal mechanism catalog for 86 M w > 4.0 earthquakes that occurred in the Myanmar region from 2016 to 2021. We apply the generalized Cut‐and‐Paste inversion method to a new set of regional broadband waveform data to obtain the earthquake focal mechanism and centroid depth with uncertainties …This site uses cookies. By continuing to use our website, you are agreeing to our privacy policy.Geosphere is an open access, online-only journal that targets an international audience and publishes high-quality research results from all fields of the geosciences. It particularly seeks papers that take advantage of the electronic format. Full-text available for all issues.The value of information (VOI) metric requires geophysicists to clearly link their measurements to important subsurface parameters in geothermal exploration, such as temperature, permeability, and fluid information.Magnesium isotopes are widely used to trace recycled carbonates in the mantle source. We recently recognized extremely light Mg isotope values (δ 26 Mg = −0.50 to −0.62‰) in nepheline syenites in the Tarim large igneous province (TLIP), NW China. To evaluate the significance of the light Mg isotopes, we conducted petrological, mineral …Roman marine concrete structures, composed of a volcanic ash-hydrated lime mortar that binds conglomeratic tuff or carbonate rock aggregate (caementa), have remained intact and coherent for 2000 yr, either fully immersed in seawater or partially immersed in shoreline environments (Brandon et al. 2014).Ahead of his upcoming Pardee Keynote Symposia at GSA Connects 2022, GeoScienceWorld spoke with DiMaio about the impetus for Unconformity and how he made topics like academic fraud and Ediacaran fossils into the backdrop for a story about loss and self-discovery. Alex makes her discovery. Image courtesy of Unconformity.Formation–exhumation history of the Carboniferous Axi epithermal gold deposit in the Chinese Western Tianshan based on zircon U–Pb and pyrite Re–Os geochronology and (U–Th)/He zircon–apatite thermochronometryCOHESIVE STRENGTH IMPROVEMENT MECHANISM OF KAOLINITE NEAR THE ANODE DURING ELECTROOSMOTIC CHEMICAL TREATMENT. As of January 1, 2019, Clays and Clay Minerals has moved to a new platform. Subscribers prior to January 1, 2019 have access to full-text content for 2000-2018. Abstracts only for 1999, citations only from …The Central Asian Orogenic Belt (CAOB) represents the largest accretionary orogen in the world (Figure 1(a)) and is delimited by the Siberian, North China and Tarim cratons that extend through the territories of the Urals, Kazakhstan, Tien Shan, northwestern China, Mongolia and Southern Siberia. The CAOB displays a prolonged tectonic history …Carbonatites, the most silica-poor igneous rocks, have a close relationship with rare earth element (REE) ore deposits, where low SiO 2 activity is considered to contribute to economic REE mineralization. However, a paradox is raised by quartz, commonly regarded as a Si-saturation proxy, which occurs in some giant carbonatites or …Facies analysis and sequence stratigraphy of the uppermost Jurassic– Lower Cretaceous Sulaiy Formation in outcrops of central Saudi Arabia. New microplanktonic biostratigraphy and depositional sequences across the Middle–Late Eocene and Oligocene boundaries in eastern Jordan. Geochemical characterisation, volumetric assessment and shale-oil ...This site uses cookies. By continuing to use our website, you are agreeing to our privacy policy.About GSW. GeoScienceWorld (GSW) is a nonprofit collaborative and comprehensive resource for research and communications in the Earth Sciences. GSW works with societies, institutions, and researchers around the world and provides a single source of access to more than 50 preeminent scholarly journals, 2,200+ eBooks, and over 4.5 million GeoRef ...11 окт. 2023 г. ... В рамках тестового доступа открыты следующие ресурсы: GeoScienceWorld Millennium Collection of Journals – коллекция научных журналов с высокими ...To aid conceptual targeting, the past two decades have seen the emergence of the mineral systems concept, whereby ore deposits are viewed as small-scale expressions of a range of earth processes that take place at …This paper contains ground-motion prediction equations (GMPEs) for average horizontal-component ground motions as a function of earthquake magnitude, distance from source to site, local average shear-wave velocity, and fault type.Abstract. The tectonic affiliations and magma compositions that formed Earth’s earliest crusts remain hotly debated. Previous efforts toward this goal have relied heavily on determining the provenance of Hadean zircons using low-dimensional discriminant diagrams developed from Phanerozoic samples, which are inadequate for …GeoRef records only prior to that. In the first quarter of 2021, the CSPG Board of Directors unanimously voted to change the name of the Bulletin of Canadian Petroleum Geology (BCPG) to the Bulletin of Canadian Energy Geoscience (BCEG). The BCEG aims to be the journal of record for papers dealing with all aspects of energy geoscience, broadly ...Innovative Split Screen Features: Browseable images on the right, full text on the left. Scroll each independently. View larger versions of images. Download images for PowerPoint options. Tab structure showing Table of Contents, References, and Related Links. PDF View, standard view options.This site uses cookies. By continuing to use our website, you are agreeing to our privacy policy.The Steptoean Positive Carbon Isotope Excursion (SPICE) event at ca. 497−494 Ma was a major carbon-cycle perturbation of the late Cambrian that coincided with rapid diversity changes among trilobites.GeoScienceWorld remains neutral with regard to jurisdictional claims in published maps. For reasons of consistency, authors are requested to use accepted standard maps as the basis for map figure drawing, for example using the latest standard base-map of Map Press. Responsibility for maps rests with the author and it is their responsibility to ...484 Geology of the Nautanen North Cu-Au-Ag- (Mo) Deposit, Norrbotten, Sweden. 412 Diagenetic History and Timing of Cu and Zn-Pb Sulfide Mineralization in the Permian Kupferschiefer System, Saale Subbasin, Eastern Germany. 371 The Age and Origin of the Ruwai Polymetallic Skarn Deposit, Indonesia: Evidence of Cretaceous Mineralization in the ...Gold Potential of a Hidden Archean Fault Zone: The Case of the Cadillac–Larder Lake Fault. Geophysical Case Study of Shallow and Deep Structures Based on Traditional and Modified Interpretation Methods: Application to Tectonic Studies and Mineral Exploration. The Geological Setting, Mineralogy, and Paragenesis of Gold-Bearing Polymetallic (Cu ... Some of the largest Au deposits in the world contain high-grade ores of “invisible” gold (e.g., Carlin-type deposits; Cook and Chryssoulis 1990; Simon et al. 1999b).Based on in situ trace element, spectroscopic, and experimental analyses, it has been suggested that “invisible” gold is often present in the lattice of the ore minerals such …56 Presence of hydrocarbons on Mars: A possibility. 35 Groundwater salinity and the effects of produced water disposal in the Lost Hills–Belridge oil fields, Kern County, California. 12 Carbon dioxide storage resource assessment of Cretaceous- and Jurassic-age sandstones in the Atlantic offshore region of the northeastern United States. Lithium isotopes show great potential to trace Earth surface processes due to the large mass discrimination between 6 Li and 7 Li associated with clay uptake. However, factors controlling the Li isotopic composition (δ 7 Li) of river water, especially those with a water-bedrock δ 7 Li difference higher than that of the equilibrium fractionation …Usability enhancements to the sign in area and journal archive pagers. Page 10. WWW.GEOSCIENCEWORLD.ORG. 10. Information for Librarians.Abstract. The tectonic affiliations and magma compositions that formed Earth’s earliest crusts remain hotly debated. Previous efforts toward this goal have relied heavily on determining the provenance of Hadean zircons using low-dimensional discriminant diagrams developed from Phanerozoic samples, which are inadequate for …Browse Issues. Full-text available from the year 1916 to current. 2023 Volume 108, Numbers 1 - 10. 2022 Volume 107, Numbers 1 - 12. 2021 Volume 106, Numbers 1 - 12. 2020 Volume 105, Numbers 1 - 12. 2019 Volume 104, Numbers 1 - 12. 2018 Volume 103, Numbers 1 - 12. 2017 Volume 102, Numbers 1 - 12. Here, we present a new CO 2 record across the past 23 m.y. of Earth history based on the δ 13 C value of terrestrial C 3 plant remains, using a method applicable to the entire ∼400 m.y. history of C 3 photosynthesis on land. Across the past 23 m.y., CO 2 likely ranged between ∼230 ppmv and 350 ppmv (68% confidence interval: ∼170–540 ppm).PAGODA Research Group (Plateau & Global Desert Basins Research Group), Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, ChinaGSW Society Partners. GSW provides a platform and publishing services for 37 trusted scholarly societies in the Earth Sciences. Our high-value, curated research platform …GeoScienceWorld (http://www.geoscience- world.org) launched its new portal on. February 25, 2005. The initial GeoScience. World (GSW) collection incorporated ...Properties of high-performing horizontal wells in the Midland Basin. Mass balance of generation, retention, and production for the Wolfcamp-sourced hydrocarbon in the Permian Delaware Basin: Insight on remaining recoverable resource and expulsion efficiency. Horizontal well path design with seismic inversion for a shale oil reservoir in the ... From the first issue in 1905 onward, Economic Geology has been the main publication for those who study mineral deposits; indeed, it is now difficult to imagine economic geology without Economic Geology. It is interesting to ask, therefore, Who were the farsighted people who founded the journal, and Why did they think a specialized …Geology has been the Web of Science's #1 ranked "geology" journal for 15 years in a row. The journal Geology publishes timely, innovative, and provocative articles relevant to its international audience, representing research from all fields of the geosciences. Full-text available for all issues.We introduce an open‐source MATLAB software package, named Crazyseismic, for passive seismic data preprocessing. Built‐in core functions such as seismic phase travel‐time calculation and multichannel cross correlation significantly improve the efficiency of data processing.Earthquake early warning (EEW) systems are crucial for mitigating seismic hazards. Current EEW algorithms predominantly rely on seismic data (Allen and Melgar, 2019) and can be classified into three main categories: point‐source, finite‐fault, and ground‐motion‐model based.GeoRef (GeoScienceWorld) ... GeoRef contains over 2 million references to geoscience journal articles, books, maps, conference papers, reports, theses and .... Browse Journals by Title | GeoScienceWorld Browse Journals by TitlThe tectonic evolution of the South China Sea is close The impact that geoscience research is having on society and sustainability goals is reflected in the literature. GeoScienceWorld (GSW) analyzed 38,000 articles published from 2012 to 2021 in 49 journals to quantify the collective contribution of the research on the UN Sustainable Development Goals. Aggregated results for GSW corpus of research ...1 State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China † Corresponding authors: [email protected]; [email protected]. Melissa Lester. Journal of Sedimentary Research. 3300 Penr The continuation of the Mull Dyke Swarm into the Southern North Sea. Mesozoic evolution of large-scale drainage systems in the Indochina Block: evidence from paleomagnetic and U-Pb geochronological constraints. Palaeomagnetism of the mid-Cretaceous red beds from the Tethyan Himalaya: direction discrepancy and tectonic implications.The NGA-West2 project database expands on its predecessor to include worldwide ground motion data recorded from shallow crustal earthquakes in active tectonic regimes post-2000 and a set of small-to-moderate-magnitude earthquakes in California between 1998 and 2011. The database includes 21,336 (mostly) three-component … GeoScienceWorld Journal and Ebook Collection including GeoRef. ...

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