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regolith

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Journal Article
Journal: Economic Geology
Published: 01 November 2022
Economic Geology (2022) 117 (7): 1497–1520.
... a valuable niobium resource estimated at 14.5 Mt at 1.52 wt % Nb 2 O 5 (at a cut-off grade of 0.5% Nb 2 O 5 ) hosted in carbonatite-related rocks and their regolith in the southern part of the Catalão II Complex, in central Brazil. Morro do Padre shares numerous geologic features with some of the biggest...
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Journal Article
Journal: Geology
Published: 24 March 2022
Geology (2022) 50 (6): 721–725.
... before 3.0 Ga is explained by contamination with embedded zircon grains sourced from transported regolith. Zircon U-Pb age spectra obtained by laser ablation–inductively coupled plasma mass spectrometry (LA-ICPMS) analysis of modern alluvium in creek beds draining the metasedimentary belts of Mount...
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Journal Article
Journal: Economic Geology
Published: 01 March 2022
Economic Geology (2022) 117 (2): 495–508.
...Wei Tan; Xiaorong Qin; Jiacheng Liu; Mei-Fu Zhou; Hongping He; Christina Yan Wang; Jian Huang; Jianxi Zhu; Yuzeng Yao; Thomas Cudahy Abstract Regolith-hosted rare earth element (REE) deposits predominate global resources of heavy REEs. Regoliths are underlain by various types of igneous rocks...
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Journal Article
Journal: GSA Bulletin
Published: 17 December 2021
GSA Bulletin (2022) 134 (7-8): 2007–2021.
...., regolith depth). Interfluve networks were ordered with an approach directly analogous to that first proposed for ordering streams and rivers by Robert Horton in the GSA Bulletin in 1945. At the Calhoun CZO, low-order hillsheds are numerous and dominate most of the observatory's ~190 km 2 area. Low-order...
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Journal Article
Published: 01 December 2021
South African Journal of Geology (2021) 124 (4): 817–842.
...G.A. Botha Abstract The Cenozoic stratigraphy of South Africa has developed over the past 166 years since geological mapping of the region was initiated. The current status of lithostratigraphy and the global chronostratigraphic framework is discussed in the context of the diverse Cenozoic regolith...
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Journal Article
Journal: Economic Geology
Published: 01 June 2021
Economic Geology (2021) 116 (4): 837–861.
... ). During Miocene-Pliocene, the onset of the Velhas geomorphological cycle led to the dismantling of the Sul-Americano surface and partial reworking and sedimentation of the ancient regolith profiles in the lowlands. Silicified horizons protected the profiles from erosion during the Velhas cycle ( de...
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Journal Article
Published: 01 April 2021
Bulletin de la Société Géologique de France (2021) 192 (1): 17.
... Regolith Weathered rock fragments Clay & Loam (silt) Weathered rock fragments Sorted sands Sieved sands Bedrock Unsorted rock fragment Volcanic cinders Very scarce rock fragments Exogeneous crushed rocks The results of the radiocarbon dating of all the three selected sites fall...
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Journal Article
Journal: Clay Minerals
Published: 08 March 2021
Clay Minerals (2021) 56 (1): 1–15.
... regolith-hosted heavy rare earth element ( HREE ) deposits. In Brazil, pegmatites from the state of Rio de Janeiro have been catalogued, but their potential to host halloysite deposits has never been studied. After a mineral exploration programme, one pegmatite with considerable halloysite contents...
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Journal Article
Journal: GSA Bulletin
Published: 15 January 2021
GSA Bulletin (2021) 133 (9-10): 1930–1946.
...Matan Ben-Asher; Itai Haviv; Onn Crouvi; Joshua J. Roering; Ari Matmon Abstract Carbonate hillslopes are often soil mantled and display a classic convex morphology. In this study we examine controls on carbonate hillslope denudation and morphology using a modified regolith mass balance equation...
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Journal Article
Journal: Elements
Published: 01 October 2020
Elements (2020) 16 (5): 331–336.
... and protracted, in the case of solar irradiation of rocks residing in regoliths for millions to billions of years. Noble gas thermochronology applied to meteorites and extraterrestrial materials returned by space missions enables us to decipher the histories of these materials and thereby understand fundamental...
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Journal Article
Journal: Economic Geology
Published: 01 August 2020
Economic Geology (2020) 115 (5): 1097–1118.
...Martin Yan Hei Li; Mei-Fu Zhou; Anthony E. Williams-Jones Abstract Subtropical weathering of granitic catchments in South China has led to the formation of numerous giant regolith-hosted rare earth element (REE) deposits that currently account for more than 15% of global REE production and more...
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Journal Article
Journal: Geophysics
Published: 14 July 2020
Geophysics (2020) 85 (5): E153–E162.
... are found to enhance interpretation of the regolith geology, particularly the nature and distribution of transported materials that are not afforded by mapping conductivity/conductance alone. electromagnetics airborne survey induced polarization magnetic susceptibility The original motivation...
Journal Article
Journal: Geology
Published: 29 April 2020
Geology (2020) 48 (7): 723–727.
... is relatively free of large boulders (>1 m), indicating a relatively long time of degradation, which is consistent with the estimated thicknesses of regolith and impact crater ejecta ( Huang et al., 2018 ). Craters with diameters of centimeters to tens of meters ( Figs. 1C and 2A ) were observed. We also...
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Journal Article
Published: 01 January 2020
American Mineralogist (2020) 105 (1): 1–2.
... of REE from bedrock sources (granite and sedimentary rocks) and their precipitation as secondary REE-phases and/or REE as ion-sorbed has been described recently in the Piedmont regolith and in mined kaolin beds in the Georgia Coastal Plain (e.g., Bern et al. 2017 ; Cheshire et al. 2018...
Journal Article
Published: 01 January 2020
American Mineralogist (2020) 105 (1): 92–108.
...Martin Yan Hei Li; Mei-Fu Zhou Abstract Rare earth elements (REEs) have become increasingly important to our modern society due to their strategical significance and numerous high technological applications. Regolith-hosted heavy rare earth element (HREE) deposits in South China are currently...
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Journal Article
Published: 01 November 2019
Russ. Geol. Geophys. (2019) 60 (11): 1300–1309.
... and thus, the nature and origin of the Moon ( Lucey et al., 1998 ). The VIS-NIR reflectance characteristics of the Moon are sensitive to chemical, mineralogical and physical properties of lunar regolith and have been widely used in lunar geological explorations ( Lucey et al., 2006 ). Many models have...
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Journal Article
Published: 01 September 2019
Reviews in Mineralogy and Geochemistry (2019) 85 (1): 349–380.
...Kate Maher; Alexis Navarre-Sitchler kmaher@stanford.edu asitchle@mines.edu Copyright © 2019 by the Mineralogical Society of America 2019 Mineralogical Society of America Chemical weathering, or the breakdown of rock to form regolith, occurs within an interface between...
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Journal Article
Published: 21 August 2019
Geochemistry: Exploration, Environment, Analysis (2020) 20 (3): 280–298.
...Paul A. Morris; Alex Christ; Edward J. Mikucki Abstract The <10, <4, <2.5 and <1 µm fractions of eight regolith samples have been extracted as aerosols, then analysed for more than 60 elements by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Precision...
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