 | Jesus, C. C., De Stigter, H., Miranda, P., Oliveira, A., Rocha, F. (2014) Distribution patterns and enrichment of lead, zinc and copper in surface sediments of the central Portuguese shelf and upper slope. Journal of Iberian Geology, 39 (2). doi:10.5209/rev_jige.2013.v39.n2.43196 | Journal (article/letter/editorial) | | Geosciences, University of Aveiro, 3810-193 Aveiro, Portugal ccesar.jesus@gmail.com; paulo.miranda@ua.pt; tavares...Hidrográfico, Rua das Trinas, 49, 1249-093 Lisboa, Portugal. anabela.oliveira@hidrografico.pt 1 *corresponding...offshore one of the most industrialised areas of Portugal. On the Lisbon-Setúbal-Sines shelf concentrations...Sediment Distribution Patterns, Continental Shelf, Portugal Resumen Los patrones geográficos de enriquecimiento...recogidos a lo largo de la zona más industrializada de Portugal. Las concentraciones de Al, Fe, Mg, Ti Present |  | Moreno, Ana, Nave, Silvia, Kuhlmann, Holger, Canals, Miquel, Targarona, Jordi, Freudenthal, Tim, Abrantes, Fatima (2002) Productivity response in the North Canary Basin to climate changes during the last 250 000 yr: a multi-proxy approach. Earth and Planetary Science Letters, 196 (3) 147-159 doi:10.1016/s0012-821x(01)00605-7 | Journal (article/letter/editorial) | | Jordi Targarona a , Tim Freudenthal c , Fatima Abrantes b a Grup de Recerca Consolidat en Geocie'ncies...Instituto Geologico e Mineiro, P-2720 Alfragide, Portugal c Universita«t Bremen, FB Geowissenschaften, Postfach...the overlying water is saturated with respect to calcite by CO2 release during oxic decomposition of organic...of coastal upwelling along northwest Africa and Portugal from 1981 to 1991, J. Geophys. Res. 99 (1994)...Rohling, J. Scho«nfeld, R. Zahn, P. Grootes, F. Abrantes, L. Gaspar, S. Vaqueiro, Enhanced productivity |  | | Journal (article/letter/editorial) | | Estrada da Portela, Zambujal, 2610-143 Amadora, Portugal a r t i c l e i n f o Article history: Received...element concentrations in planktonic foraminiferal calcite in a core from the Iberian Margin (MD95-2040) and...shell δ 18O (Tiso), bottom water calcite saturation state (ΔCO3 =calcite), SSSs and ln (Mg/Ca). The data...data necessary for the calculation of ΔCO3 =calcite were extracted from the GLODAP bottle dataset (Key et...combinations of seasonal SST, Tiso, SSS and ΔCO3 =calcite (Table 2) and assessed the significance of exponential |  | Wassenburg, J.A., Immenhauser, A., Richter, D.K., Niedermayr, A., Riechelmann, S., Fietzke, J., Scholz, D., Jochum, K.P., Fohlmeister, J., Schröder-Ritzrau, A., Sabaoui, A., Riechelmann, D.F.C., Schneider, L., Esper, J. (2013) Moroccan speleothem and tree ring records suggest a variable positive state of the North Atlantic Oscillation during the Medieval Warm Period. Earth and Planetary Science Letters, 375. 291-302 doi:10.1016/j.epsl.2013.05.048 | Journal (article/letter/editorial) | | Oscillation medieval climate anomaly speleothem prior calcite precipitation aragonite trace elements 1. Introduction...atmospheric conditions compared to calcite and may therefore recrystallize to calcite (Frisia et al., 2002; Martin-Garcia...interpreted in terms of prior calcite precipitation (PCP). Prior calcite precipitation (Fairchild et al...records from aragonite speleothems differs from calcite speleothems due to (1) crystallographic differences...trigonal), (2) the possible presence of secondary calcite (Frisia et al., 2002; Martin-Garcia et al., 2009; |  | | Journal (article/letter/editorial) | | Estrada da Portela – Zambujal, 2721-866 Amadora, Portugal School of Ocean Sciences, College of Natural Sciences...Editor: U. Brand Keywords: Mg/Ca δ18O Temperature Calcite Bivalve Shell a b s t r a c t The combined use...a strong seawater temperature control on shell calcite Mg/Ca has rarely been observed. In this study,...δ18Ocalcite and Mg/Ca from Pecten maximus inner shell calcite to estimate δ18Owater is reported. New Mg/Ca data...Estrada da Portela – Zambujal, 2721-866 Amadora, Portugal. Tel.: + 351 214705538; fax: + 351 217163688. |  | | Report (chapter) | | Nacional 10 (km 139,7), 2695-066 Bobadela, Lisboa, Portugal 3 Instituto Andaluz de Ciencias de la Tierra...de Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal 7 PPG da Faculdade de Geologia, Universidade...de Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal *Corresponding author (e-mail: danirey@uvigo.es)...Bank; PB, Porto Bank. as the Lusitanian Basin in Portugal (Wilson et al. 1989; Murillas et al. 1990). During...whilst quartz content and carbonates (aragonite and calcite) increase towards the open sea, both related to |  | | Journal (article/letter/editorial) | | Alfredo Magalhães Ramalho, 6, 1495-006 Lisboa, Portugal b School of Science and the Environment, Faculty...September 2016 Abstract Manganese in the shell calcite of marine bivalves has been suggested to reflect...particulate and dissolved Mn2+ concentrations and shell calcite Mn/Ca ratios. Shell Mn/Ca showed a well-defined...relationship between shell Mn/Ca in marine bivalve shell calcite and seawater particulate and dissolved Mn2+ concentrations...concentrations. The use of Mn content from M. edulis shell calcite as a proxy for the dissolved and/or particulate |  | Roucoux, K.H., Tzedakis, P.C., de Abreu, L., Shackleton, N.J. (2006) Climate and vegetation changes 180,000 to 345,000 years ago recorded in a deep-sea core off Portugal. Earth and Planetary Science Letters, 249 (3) 307-325 doi:10.1016/j.epsl.2006.07.005 | Journal (article/letter/editorial) | | 000 years ago recorded in a deep-sea core off Portugal K.H. Roucoux a,⁎, P.C. Tzedakis a , L. de Abreu...All rights reserved. Keywords: North Atlantic; Portugal; marine palynology; MIS 7; MIS 8; MIS 9; land-ocean...ka). Since there are no terrestrial sequences in Portugal reaching this far back in time, this sequence...sequence from the Serra da Estrella in central Portugal [26] it is clear that although over-representation...similarity between the benthic δ18O record off Portugal and Antarctic temperatures. The implication that |  | Freitas, Pedro S., Clarke, Leon J., Kennedy, Hilary, Richardson, Christopher A., Abrantes, Fátima (2006) Environmental and biological controls on elemental (Mg/Ca, Sr/Ca and Mn/Ca) ratios in shells of the king scallop Pecten maximus. Geochimica et Cosmochimica Acta, 70 (20) 5119-5133 doi:10.1016/j.gca.2006.07.029 | Journal (article/letter/editorial) | | Kennedy a, Christopher A. Richardson a, Fátima Abrantes b a School of Ocean Sciences, University of Wales...Marinha, INETI, Apartado 7586, 2721-866 Alfragide, Portugal Received 23 September 2005; accepted in revised...are approximately one-fourth those in inorganic calcite, half those in the bivalve Pinna nobilis, twice...observations that Mg/Ca ratios in bivalve shell calcite are an unreliable temperature proxy, as well as...have been observed in some bivalve species with calcite shells (Mitchell et al., 1994), including the bivalve |  | Thouveny, N., Moreno, E., Delanghe, D., Candon, L., Lancelot, Y., Shackleton, N.J. (2000) Rock magnetic detection of distal ice-rafted debries: clue for the identification of Heinrich layers on the Portuguese margin. Earth and Planetary Science Letters, 180 (1) 61-75 doi:10.1016/s0012-821x(00)00155-2 | Journal (article/letter/editorial) | | ice rafting; Heinrich events; climate; cycles; Portugal; continental margin 1. Introduction Ice rafting...Letters 180 (2000) 61^75 minerals (quartz and calcite) and by paramagnetic minerals (silicates) but it...sta¡ The demonstration of IRDs delivery on the Portugal margin during H.E. is based on several clues....P.P.E. Weaver, Evidence for Heinrich layers o¡ Portugal (Tore Seamount: 39³N, 12³W), Mar. Geol. 131 (1996)...Paleoceanography 12 (1997) 696^710. J.H. Baas, J. Mienert, F. Abrantes, M.A. Prins, Late Quaternary sedimentation on |  | Mena, Anxo, Francés, Guillermo, Pérez-Arlucea, Marta, Aguiar, Pablo, Barreiro-Vázquez, José Daniel, Iglesias, Alfredo, Barreiro-Lois, Andrés (2015) A novel sedimentological method based on CT-scanning: Use for tomographic characterization of the Galicia Interior Basin. Sedimentary Geology, 321. 123-138 doi:10.1016/j.sedgeo.2015.03.007 | Journal (article/letter/editorial) | | H2 (Fig. SC 10). NU Densities of biogenic calcite and aragonite are 2.65 g cm-3 and 2.79 g cm-3,... RI freshwater NU Baas, J.H., Mienert, J., Abrantes, F., Prins, M.A., 1997. Late Quaternary sedimentation...P.P.E., 1996. Evidence for Heinrich layers off Portugal (Tore Seamount: 39°N, 12°W). Marine Geology 131...131, 4756. Lebreiro, S.M., Moreno, J.C., Abrantes, F.F., Pflaumann, U., 1997. Productivity and paleoceanographic...Paleoceanography 12, 718-727. Lebreiro, S.M., Francés, G., Abrantes, F.F.G., Diz, P., Bartels-Jónsdóttir, H.B., Stroynowski |  | | Book | | EXPLORAÇÃO MINEIRA ROMANA E A METALURGIA DO OURO EM PORTUGAL UNIVERSIDADE DO MINHO INSTITUTO DE CIÊNCIAS SOCIAIS...tenham sido aproveitados. Embora no Centro de Portugal o número de jazidas auríferas secundárias e primárias...grande maioria dos conjuntos mineiros antigos de Portugal, e do Noroeste de Espanha esteja por fazer, é...Tejo, pelo que ainda há muito por estudar. Em Portugal nem sequer existia um catálogo sistemático das...uma nova fase dos estudos de Mineração Antiga em Portugal, não só porque é o primeiro trabalho académico |  | Ait Brahim, Yassine, Cheng, Hai, Sifeddine, Abdelfettah, Wassenburg, Jasper A., Cruz, Francisco W., Khodri, Myriam, Sha, Lijuan, Pérez-Zanón, Núria, Beraaouz, El Hassane, Apaéstegui, James, Guyot, Jean-Loup, Jochum, Klaus Peter, Bouchaou, Lhoussaine (2017) Speleothem records decadal to multidecadal hydroclimate variations in southwestern Morocco during the last millennium. Earth and Planetary Science Letters, 476. 1-10 doi:10.1016/j.epsl.2017.07.045 | Journal (article/letter/editorial) | | translucent. A mosaic fabric (typical for secondary calcite) or acicular fabric/needle like crystals (associated...concentrations range from 6000 up to 14000 ppm. A secondary calcite (as a product from aragonite-tocalcite transformation)...suggests that stalagmite IFK1 consists of primary calcite. The structure at the base of the stalagmite is...algorithm (Scholz and Hoffmann, 2011; Fig. 2b). 651 calcite micro-samples were drilled with a high resolution...temperature dependence of isotope fractionation between calcite and drip water in the cave. For instance, a decrease |  | | Report (chapter) | | 613C in planktonic and benthic foraminiferal test calcite. Such eutrophic indicators are shown to have peaked...notably d u r i n g the peak of glaciation (after Abrantes 1991). d 4001 ,~- ~" :-~*-eJ "~' I 0 o 9 ...of past ocean fertility (Tiedemann et al. 1989; Abrantes 1991, 1992) with accuracies that now approach...siliceous microfossils must therefore be analysed (Abrantes 1992). Since diatoms predominate in the highly...foraminifera, in which an increase in the Cd/Ca of test calcite may serve to indicate episodes of upwelling, especially |  | Peral, Marion, Daëron, Mathieu, Blamart, Dominique, Bassinot, Franck, Dewilde, Fabien, Smialkowski, Nicolas, Isguder, Gulay, Bonnin, Jérôme, Jorissen, Frans, Kissel, Catherine, Michel, Elisabeth, Vázquez Riveiros, Natalia, Waelbroeck, Claire (2018) Updated calibration of the clumped isotope thermometer in planktonic and benthic foraminifera. Geochimica et Cosmochimica Acta, 239. 1-16 doi:10.1016/j.gca.2018.07.016 | Journal (article/letter/editorial) | | 2010) or based on trace elements in biogenic calcite (e.g., Mg/Ca in foraminifera; Elderfield and Ganssen...contaminants, exposing well-preserved foraminiferal calcite. Conversely, protocol #1 (Figure 2c) produces ...δ18OSW/ VSMOW are the δ18O of the foraminiferal calcite relative to VPDB and of the seawater relative to...is the oxygen-18 fractionation factor between calcite and water: αcc/w = (1 + δ18OC/SMOW / 1000) / (1...and δ18OSW/SMOW corresponding to foraminiferal calcite and seawater, respectively, both relative to VSMOW |  | | Journal (article/letter/editorial) | | basement. The middle course (from Navalmoral to Abrantes) cuts low-grade metamorphic rocks (Precambrian...deposits. The lower course of the Tajo River (from Abrantes to Lisboa) is developed on the Santarem–Lisboa...261–281 CI Biosparite limestone Grainstone Calcite (single crystal) Fossil Silty-arenitic limestone...1985). These latter grains have various types of calcite crystals of terrestrial carbonates (i.e., micrite...from this province, between Navalmoral and Abrantes (Portugal), is quartzofeldspathic (Qm 60 F 33Lt 7) |  | | Journal (article/letter/editorial) | | studied brachiopod species comprising low-Mg CE calcite. Strong covariation of Sr/Ca ratios with Mg/Ca...Geochemical information derived from brachiopod shell calcite is of major importance for understanding past environmental...single species are rare. Studies of brachiopod calcite chemistry have mostly focused on the distribution...ratios and elements recorded in brachiopod shell calcite have been documented (e.g., Carpenter and Lohmann...chemical and isotopic patterns observed in brachiopod calcite have been generalized to the assumption that the |  | | Journal (article/letter/editorial) | | comparison with core MD952042 from offshore southern Portugal [12], to investigate the history of the Azores...temperatures (16 jC for the GoC, 15 jC for southern Portugal) [13]. Plankton tows in the Gulf of Cadiz indicate...cause more light oxygen to be incorporated into calcite, giving negative d18O shifts. Fresh water has a...(1999) 157 – 172. S.M. Lebreiro, J.C. Moreno, F.F. Abrantes, U. Pflaumann, Productivity and paleoceanography...Recent foraminifera from the continental-margin of Portugal, Micropaleontology 39 (1) (1993) 75 – 87. O. Cayre |  | Baghli, H., Mattioli, E., Spangenberg, J.E., Bensalah, M., Arnaud-Godet, F., Pittet, B., Suan, G. (2020) Early Jurassic climatic trends in the south-Tethyan margin. Gondwana Research, 77. 67-81 doi:10.1016/j.gr.2019.06.016 | Journal (article/letter/editorial) | | oxygen isotope measurements of brachiopod shell calcite from sections in NW Algeria, which was a marginal...sessile and benthic organisms that precipitate their calcite shell in close chemical and isotopic equilibrium...preparation 3.2. Analyses The preservation of calcite fibres of all brachiopod shells was assessed under...textures observed vary from well-preserved, when calcite fibres are long and thin, without any clear trace...brachiopod specimens have shown very poorly preserved calcite fibres, almost completely overgrown. The ultra-structure |  | Jacob, D.E., Soldati, A.L., Wirth, R., Huth, J., Wehrmeister, U., Hofmeister, W. (2008) Nanostructure, composition and mechanisms of bivalve shell growth. Geochimica et Cosmochimica Acta, 72 (22) 5401-5415 doi:10.1016/j.gca.2008.08.019 | Journal (article/letter/editorial) | | heterogeneous nucleation and growth of aragonite (or calcite) crystals within pre-existing organic compartments...then mediates the crystallization of aragonite or calcite by either heterogeneous nucleation (Addadi et al...evidence for its role as a precursor for aragonite or calcite in adult animals is still lacking. 2. MATERIALS...minor proportions of vaterite (see below), but no calcite. Bivalves do not mineralize their shells directly...which transforms with time into aragonite and calcite, respectively. The common characteristic of this |  | Hendry, Katharine R., Gong, Xun, Knorr, Gregor, Pike, Jennifer, Hall, Ian R. (2016) Deglacial diatom production in the tropical North Atlantic driven by enhanced silicic acid supply. Earth and Planetary Science Letters, 438. 122-129 doi:10.1016/j.epsl.2016.01.016 | Journal (article/letter/editorial) | | Souza et al., 2012). 2.4. Benthic foraminiferal calcite stable isotopes To complement δ 30 Si at OMEXII-9K...OMEXII-9K, benthic foraminiferal (Cibicidoides sp.) calcite oxygen and carbon stable isotopes were mea- The..., Canals, M., Targarona, J., Freudenthal, T., Abrantes, F.G., 2002. Productivity response in the North...Rohling, E., Schönfeld, J., Zahn, R., Grootes, P., Abrantes, F., Gaspar, L., Vaqueiro, S., 2000. Enhanced |  | Bougeois, Laurie, de Rafélis, Marc, Reichart, Gert-Jan, de Nooijer, Lennart J., Nicollin, Florence, Dupont-Nivet, Guillaume (2014) A high resolution study of trace elements and stable isotopes in oyster shells to estimate Central Asian Middle Eocene seasonality. Chemical Geology, 363. 200-212 doi:10.1016/j.chemgeo.2013.10.037 | Journal (article/letter/editorial) | | perpendicular to the growth lines of foliated calcite accumulated in the ligamental area during the oyster's...the elemental and stable isotopic composition of calcite from incremental growth rings allows recovering...Specifically, oyster shells are built of low-magnesium calcite which is the most resistant calcium carbonate to...2013) which could thus, in conjunction with δ18Oc calcite, be used to estimate both temperature and salinity..., 2001, 2003). Foliated, chalky and prismatic calcite are the main forms of calcium carbonate found in |  | | Journal (article/letter/editorial) | | the form of two major polymorphs: aragonite and calcite(e.g., Lorens and Bender, 1980). The polymorphs...is prone to incorporate larger molecules than calcite (Morse and Bender, 1990; Fallini et al., 1996)...two orders of magnitude higher than into abiotic calcite (Lorens, 1981; Tesoriero and Pankow, 1996), possibly...because aragonite incorporates larger cations than calcite (Falini et al., 1996). Strontium carbonate is virtually... S., Addadi, L. 1996. Control of aragonite or calcite polymorphism by mollusk shell macromolecules. Science |  | Bolton, Clara T., Lawrence, Kira T., Gibbs, Samantha J., Wilson, Paul A., Cleaveland, Laura C., Herbert, Timothy D. (2010) Glacial–interglacial productivity changes recorded by alkenones and microfossils in late Pliocene eastern equatorial Pacific and Atlantic upwelling zones. Earth and Planetary Science Letters, 295 (3) 401-411 doi:10.1016/j.epsl.2010.04.014 | Journal (article/letter/editorial) | | during settling and incorporation into sediments (Abrantes et al., 2002; Sprengel et al., 2002), others have...with upwelling strength both in the modern ocean (Abrantes et al., 2002; Goñi et al., 2003) and in the palaeo-record...of the lower saturation state with respect to calcite in Pacific waters (Feely et al., 2004). In addition...at doi:10.1016/j.epsl.2010.04.014. References Abrantes, F., Meggers, H., Nave, S., Bollmann, J., Palma...2008. Variable export fluxes and efficiencies for calcite, opal and organic carbon in the Atlantic Ocean: |  | | Journal (article/letter/editorial) | | 6.5% expansion of the structure around Sr2+ in calcite: Finch and Allison (2007)). However, it is possible...responses. Mar. Pollut. Bull. 65, 81–100. Campos, I., Abrantes, N., Keizer, J.J., Vale, C., Pereira, P., 2016...ashes of eucalypt and pine forest plantations in Portugal following a wildfire. Sci. Total Environ. 572,...Allison, N., 2007. Coordination of Sr and Mg in calcite and aragonite. Mineral. Mag. 71, 539–552. Furnas...J.L., Campos, I., Keizer, J.J., Goncalves, F., Abrantes, N., 2015. Toxicity assessment of aqueous extracts |
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