Other language confidence: 0.916450759946952
La carte « Ressources en eaux souterraines dans la région de la CEDEAO » saisit et normalise les données existantes sur les eaux souterraines de l'Afrique de l'Ouest et donne un aperçu régional cohérent sur les ressources en eaux souterraines. Elle fournit une évaluation quantitative de la productivité de l'aquifère en utilisant une combinaison du type d'écoulement de l'aquifère et du rendement attendu du forage. La carte met en évidence l’aptitude des aquifères pour l'approvisionnement en eau à différentes échelles tout en montrant les limites physiques du développement des eaux souterraines. L'élaboration de la carte comprenait l'harmonisation des cartes géologiques continentales et régionales existantes et l'attribution des unités hydrogéologiques avec les données de rendement attendu compilées à partir d'une méta-enquête bibliographique. Les cartes en encart mettent en évidence la structure géologique, les niveaux de fond géogéniques d'arsenic et de fluorure et la recharge des eaux souterraines.
La carte « Ressources en eaux souterraines dans la région de la CEDEAO » saisit et normalise les données existantes sur les eaux souterraines de l'Afrique de l'Ouest et donne un aperçu régional cohérent sur les ressources en eaux souterraines. Elle fournit une évaluation quantitative de la productivité de l'aquifère en utilisant une combinaison du type d'écoulement de l'aquifère et du rendement attendu du forage. La carte met en évidence l’aptitude des aquifères pour l'approvisionnement en eau à différentes échelles tout en montrant les limites physiques du développement des eaux souterraines. L'élaboration de la carte comprenait l'harmonisation des cartes géologiques continentales et régionales existantes et l'attribution des unités hydrogéologiques avec les données de rendement attendu compilées à partir d'une méta-enquête bibliographique. Les cartes en encart mettent en évidence la structure géologique, les niveaux de fond géogéniques d'arsenic et de fluorure et la recharge des eaux souterraines.
The Proterozoic Carpentaria province in northern Australia is host to several of the world’s largest clastic dominant (CD-type) massive sulphide deposits. These deposits are mostly hosted primarily in dolomitic silt- and mudstones. The hydrothermal alteration footprint of these CD-type systems is not well constrained, which poses challenges for the targeting of future discoveries. One important aspect to developing alteration models relates to defining the composition of the unaltered protolith to mineralization. In this dataset, we provide whole rock lithogeocheochemical data generated from samples obtained from drill-holes that intersected the mineralization in the Teena subbasin. A small number of samples are from 2 drill-holes from an adjoining subbasin (Myrtle) in the area. The samples were selected from stratigraphy of the Barney Creek Formation and are from the hangingwall to the mineralization in either subbasin. This data report includes bulk rock major, minor, and trace element composition. The data were generated using X-ray fluorescence, inductively coupled plasma mass spectrometry, and LECO analyses. Access to drill cores was granted by Teck Australia (Pty Ltd) and the drill core IDs and depths of individual samples are reported in the data table. For further details see: Magnall et al. (2021 - WHEN AVAILABLE)
Understanding the evolution of foreland basins provides rich information about present and past orogenies and plate-scale tectonic processes. The Andean foreland basin, also known as the Chacopampean plain, preserves sedimentary records in the subsoil from the late Precambrian to the present day. This region was considered poor in tectonic activity before the Cenozoic. This dataset contributes to the elucidation of the geological evolution of the transitional zone between three distinct basin systems: the Salta Rift, the intracratonic Chacoparanaense, and the Andean foreland basins. The database consists of 19 seismic lines and data from 18 wells located in the Chacopampean plain, both in the domains of the Chacoparanaense Basin and in the domain of the Salta Rift Basin, and velocity data from seismic headers that allow the correlation of data from time and depth domains. With these data, we have interpreted a complex tectonic history persisting to the Palaeogene by analysing industry seismic-reflection data and borehole records. This research provides an unprecedented, detailed investigation of a poorly explored region.
Trace element (TE) analysis of pyrite via LA-ICP-MS can produce large, paragenetically-constrained datasets, which can be used to reconstruct the conditions of pyrite formation in complex mineral systems. The Carpentaria province in northern Australia is host to some of the world’s highest value Zn-Pb (+Ag, Cu) deposits. The genesis of many of these deposits in the southern part of the province is controversial due to tectonic overprinting, with competing models of single- vs. multi-stage ore formation. In this study, LA-ICP-MS analysis of pyrite from the George Fisher Zn-Pb-Ag deposit and correlative unmineralized host rocks has been combined with paragenetic and whole rock lithogeochemical data. Paragenetically constrained pyrite TE data were then evaluated in the context of single- vs. multi-stage ore formation models and compared with recent data from undeformed clastic-dominated (CD-type) deposits of the northern Carpentaria province. Pre-ore diagenetic pyrite is compositionally similar to other Proterozoic diagenetic pyrite, with some evidence of minor hydrothermal anomalism that could help define distal alteration, but requires further analysis. Pyrite from the different ore stages is compositionally distinct, consistent with a multi-stage system. Ore stage 1 pyrite has high concentrations of Cu, Zn, As, Ag, Sb, Tl, and Pb as well as high Co/Ni ratios, whereas ore stage 2 pyrite contains Ni and Co, and ore stage 3 pyrite is dominated by Co with lesser concentrations of Ni and Cu. Ore stage 1 pyrite has a similar composition to hydrothermal pyrite in the undeformed northern Carpentaria CD-type deposits and likely formed syn-diagenesis. Ore stage 2 was syn-deformation, and resulted in replacement and recrystallization of pre-existing pyrite that also resulted in the expulsion of incompatible TEs. Ore stage 3 formed via a later Cu mineralizing event that resulted in a new geochemically distinct generation of Co-rich pyrite. This study demonstrates the value of pargenetically-constrained pyrite TE data for refining genetic models in complex sediment hosted mineral systems. This data publication includes pyrite trace element compositions (in ppm) of 28 samples from the un-mineralized Urquhart Shale Formation and from the George Fisher deposit. Access to drill cores was granted by Mount Isa Mines (MIM) George Fisher operation and Mount Isa Mines Resource Development.
Carbonate minerals are ubiquitous in most sediment-hosted mineral deposits. These deposits can contain a variety of carbonate types with complex paragenetic relationships. When normalized to chondritic values (CN), rare-earth elements and yttrium (REE+YCN) can be used to constrain fluid chemistry and fluid-rock interaction processes in both low- and high-temperature settings. Unlike other phases (e.g., pyrite), the application of in situ laser ablation-inductively coupled plasma-mass spectroscopy (LA-ICP-MS) data to the differentiation of pre-ore and hydrothermal carbonates remains relatively untested. To assess the potential applicability of carbonate in situ REE+Y data, we combined transmitted light and cathodoluminescence (CL) petrography with LA-ICP-MS analysis of carbonate mineral phases from (1) the Proterozoic George Fisher clastic dominated (CD-type) massive sulfide deposit and from (2) correlative, barren host rock lithologies (Urquhart Shale Formation). The REE+YCN composition of pre-ore calcite suggests it formed during diagenesis from diagenetic pore fluids derived from ferruginous, anoxic seawater. Hydrothermal and hydrothermally altered calcite and dolomite from George Fisher is generally more LREE depleted than the pre-ore calcite, whole-rock REE concentrations, and shale reference values. We suggest this is the result of hydrothermal alteration by saline Cl--rich mineralizing fluids. Furthermore, the presence of both positive and negative Eu/Eu* values in calcite and dolomite indicates that the mineralizing fluids were relatively hot (>250°C) and cooled below 200-250°C during ore formation. This study confirms the hypothesis that in situ REE+Y data can be used to differentiate between pre-ore and hydrothermal carbonate and provide important constraints on the conditions of ore formation.
SEGY and supplementary data of the seismic reflection experiment in the Baza Basin (Southern Spain). Presented are unstacked and unmigrated data of three 2D vibroseis profiles which were carried out in October 2013 and all corresponding raw data. The dataset is archived at the GIPP Experiment and Data Archive. The Baza Basin is an intra-mountain evaporitic basin in the Betic Cordillera (Southern Spain). The basin is formed by Pliocene to Pleistocene sediments. It can be distinguished into three lithological zones corresponding to different paleo-environments (Gibert et al., 2007). The inner zone, interpreted as a central saline lake, is dominated by an alternation of gypsum and carbonate laminae. The intermediate zone is characterized by cyclic carbonate beds. This zone is interpreted as a mosaic of shallow lakes surrounding the inner zone. The marginal zone consists of lacustrine deposits which are surrounded by an alluvial belt. In the marginal zone, distal fan deposits and shallow lake sediments alternate as a result of fluctuations in the lake water level which are related to changes in climate (Gibert et al., 2007). Therefore, up to 2.5 km thick lacustrine and ancillary continental deposits are found in this part of the basin which provide an unique archive of climatic changes and paleo-climatic events. The basin is bounded to the West by the Baza fault zone (e.g., Alfaro et al., 2010). There are plans to analyze the sedimentary record of the central zone with regard to the paleo-climaste in the Mediterranean as well as on a global scale within a scientific drilling project. In preparation for future drilling activities, the project BASE (BAza Seismic Experiment) started in the middle of the year 2013 with a duration of 12 month. In the framework of this project, controlled-source seismic measurements were used to investigate the structure of the Baza Basin and to find local zones of neo-tectonic deformation bounding the basin to the west (Baza fault). The aim of the seismic work was to provide structural information for the planned scientific drilling project. The vibroseismic experiments were carried out in the vicinity of Baza during 21st and 29th October 2013. A net of three individual seismic profiles was conducted, each 18 km in length (Figure 1). Two simultaneously operating vibrators were used as source at 301 positions at each profile. The nominal source point spacing was 60 m. The receivers were spread along the active profile in a roll-along configuration with a nominal receiver spacing of 20 m. Depending on the proceeding of the vibrators, groups of receivers were picked up at the end of the spread and were moved to the front. With a total amount of ~340 receivers, an offset range of at least 3 km around the source point was covered during the entire registration of each profile. Additionally to the roll-along receivers at Line 2, 31 fixed recorders were spread with a spacing of 600 m over the full distance of this profile (far-field recordings).
The Proterozoic Carpentaria province in northern Australia comprises several of the wordl's largest Zn-Pb massive sulphide deposits. These deposits are mostly hosted in fine grained siliciclastic sedimentary rocks, which have been affected by variable degrees of tectonic overprint, especially to the south of the district. Three of these world class clastic-dominated (CD-type) Zn-Pb deposits (George Fisher, Hilton, and Mount Isa) are hosted in siltstones and mudstones of the Urquhart Shale Formation (ca. 1654 Ma; southern Carpentaria Province). The hydrothermal alteration footprint of these CD-type systems is not well constrained, which complicates exploration for and discovery of new CD-type Zn-Pb deposits. A major caveat to understanding such footprints is the availability of suitable correlative host rock lithologies, which represent the un-mineralized protolith (background composition). In this study, we report whole rock lithogeocheochemical and mineralogical data from drill-holes that intersected the main ore bodies at the George Fisher deposit and from correlative un-mineralized Urquhart Shale. These data were combined with petrographic observations in order to (1) establish the detrital, authigenic, and diagenetic background composition of the Paleoproterozoic Urquhart Shale Formation, and to (2) evaluate mineralogical and associated chemical mass changes that resulted from the hydrothermal event(s) at the George Fisher deposit. This data report includes bulk rock major, minor, and trace element composition, as well as S, TOC, total C, CO2, Cgra concentrations, and mineralogical composition of 41 samples from the un-mineralized Urquhart Shale Formation and 70 samples from the George Fisher deposit. The data were generated using X-ray fluorescence, inductively coupled plasma mass spectrometry, LECO, and X-ray diffraction analyses. Access to drill cores was granted by Mount Isa Mines (MIM) George Fisher operation and Mount Isa Mines Resource Development; the respective MIM drill core IDs and depths of individual samples are reported in the data table. For further details see: Rieger et al. (2020 - WHEN AVAILABLE)