Articles | Volume 13, issue 2
https://doi.org/10.5194/se-13-271-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/se-13-271-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
02 Feb 2022
Research article |
| 02 Feb 2022
| 02 Feb 2022
Application of lithogeochemical and pyrite trace element data for the determination of vectors to ore in the Raja Au–Co prospect, northern Finland
Sara Raič
CORRESPONDING AUTHOR
Geological Survey of Finland, Espoo, 02151, Finland
Ferenc Molnár
Geological Survey of Finland, Espoo, 02151, Finland
current address: Department of Mineralogy, Institute of Geography and
Earth Sciences, Eötvös Loránd University, Budapest, 1117,
Hungary
Nick Cook
Mawson Gold Ltd., Vancouver, V6E 3V7, Canada
School of Earth and Environmental Sciences, University of St Andrews,
St Andrews KY16 9TS, UK
Hugh O'Brien
Geological Survey of Finland, Espoo, 02151, Finland
Yann Lahaye
Geological Survey of Finland, Espoo, 02151, Finland
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In situ Lu–Hf geochronology of garnet is applied to date a Finnish lithium–caesium–tantalum (LCT) pegmatite from the Somero–Tammela pegmatite region. The age obtained was 1801 ± 53 Ma, which is consistent with zircon ages of 1815–1740 Ma obtained from the same pegmatite. We show the in situ Lu–Hf method is a fast way of obtaining reliable age dates from LCT pegmatites.
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Subject area: Crustal structure and composition | Editorial team: Geochemistry, mineralogy, petrology, and volcanology | Discipline: Geochemistry
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Marc Campeny, Inmaculada Menéndez, Luis Quevedo, Jorge Yepes, Ramón Casillas, Agustina Ahijado, Jorge Méndez-Ramos, and José Mangas
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Rare earth elements (REEs), crucial metals for the energy transition and often referred to as the "vitamins of the industry," were investigated on the oceanic island of Fuerteventura (Spain). Analyzing igneous rocks, we found that Fuerteventura's carbonatites (igneous rocks composed of carbonates) may potentially contain significant resources of these extremely critical elements.
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This study improves geochemical mapping, a technique to find valuable minerals and study geological processes, by accounting for regional differences in element associations. It clusters the study area based on element similarity and detects anomalies that may indicate gold deposits. It applies the method to a region in China and confirms its effectiveness and consistency with the geology. This study can enhance geochemical mapping for mineral exploration and geological research.
Huan Miao, Jianying Guo, Yanbin Wang, Zhenxue Jiang, Chengju Zhang, and Chuanming Li
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The Taodonggou Group mudstone was deposited in a warm, humid, and hot paleoclimate with strong weathering. The parent rocks of the Taodonggou Group mudstone are felsic volcanic rocks and andesites, with weak sedimentary sorting and recycling and with well-preserved source information. The Taodonggou Group mudstone was deposited in dyoxic fresh water–brackish water in intermediate-depth or deep lakes with stable inputs of terrigenous debris but at slower deposition rates.
Daniel Muñoz-López, Gemma Alías, David Cruset, Irene Cantarero, Cédric M. John, and Anna Travé
Solid Earth, 11, 2257–2281, https://doi.org/10.5194/se-11-2257-2020, https://doi.org/10.5194/se-11-2257-2020, 2020
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This study assesses the influence of basement rocks on the fluid chemistry during deformation in the Pyrenees and provides insights into the fluid regime in the NE part of the Iberian Peninsula.
Jace M. Koger and Dennis L. Newell
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The Hurricane fault is a major and active normal fault located in the southwestern USA. This study utilizes the geochemistry and dating of calcite veins associated with the fault to characterize ancient groundwater flow. Results show that waters moving along the fault over the last 540 000 years were a mixture of infiltrating fresh water and deep, warm salty groundwater. The formation of calcite veins may be related to ancient earthquakes, and the fault influences regional groundwater flow.
Elmar Albers, Wolfgang Bach, Frieder Klein, Catriona D. Menzies, Friedrich Lucassen, and Damon A. H. Teagle
Solid Earth, 10, 907–930, https://doi.org/10.5194/se-10-907-2019, https://doi.org/10.5194/se-10-907-2019, 2019
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To understand the fate of carbon in subducted oceanic sediments and crust, we studied carbonate phases in rocks from the Mariana subduction zone. These show that carbon is liberated from the downgoing plate at depths less than 20 km. Some of the carbon is subsequently trapped in minerals and likely subducts to greater depths, whereas fluids carry the other part back into the ocean. Our findings imply that shallow subduction zone processes may play an important role in the deep carbon cycle.
Kathleen Sell, Beatriz Quintal, Michael Kersten, and Erik H. Saenger
Solid Earth, 9, 699–711, https://doi.org/10.5194/se-9-699-2018, https://doi.org/10.5194/se-9-699-2018, 2018
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Sediments containing hydrates dispersed in the pore space show a characteristic seismic anomaly: a high attenuation along with increasing seismic velocities. Recent major findings from synchrotron experiments revealed the systematic presence of thin water films between quartz and gas hydrate. Our numerical studies support earlier speculation that squirt flow causes high attenuation at seismic frequencies but are based on a conceptual model different to those previously considered.
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Short summary
Orogenic gold deposits in Paleoproterozoic belts in northern Finland have been explored not only for gold but because of the occurrences of economically important concentrations of base metals, especially cobalt. In this study we are testing the vectoring capacities of pyrite trace element geochemistry, combined with lithogeochemical and sulfur isotopic data in the Raja gold–cobalt prospect (northern Finland), by using multivariate statistical data analysis.
Orogenic gold deposits in Paleoproterozoic belts in northern Finland have been explored not only...
Special issue