Mengqian Zhu, Than T N Dam, A. Angert, Laura Bigio, O. Mayol, G. Santos-Figueroa, C. Pio
{"title":"Phosphorus Transformation in Saharan Dust during Trans-Atlantic Dust Transport","authors":"Mengqian Zhu, Than T N Dam, A. Angert, Laura Bigio, O. Mayol, G. Santos-Figueroa, C. Pio","doi":"10.46427/gold2020.3213","DOIUrl":"https://doi.org/10.46427/gold2020.3213","url":null,"abstract":"","PeriodicalId":12817,"journal":{"name":"Goldschmidt Abstracts","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76111015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Heterogeneities Evolving in Earth’s Mantle due to Melt Depletion","authors":"L. Noack, A. Balduin","doi":"10.46427/gold2020.1939","DOIUrl":"https://doi.org/10.46427/gold2020.1939","url":null,"abstract":"","PeriodicalId":12817,"journal":{"name":"Goldschmidt Abstracts","volume":"110 6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76126656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Volcanic ash eruptions are recognised as an important source of phosporus (P) for the global P cycle, delivering P to soils and the ocean. At volcanoes, P is hosted in primary phases such as melt-precipitated apatite, glass and rarely other phases (e.g., sanidine with 5 wt% P at Tolbachik volcano [1]). Data for P in volcanic gases is scarce and suggests concentrations on the order of ~0.1-10’s ppm [2-3]. However, some condensates record higher P contents, as do some ash samples that include fragments formed by gas-solid (high T contact metamorphic) reactions in the conduit [4]. Interestingly, at atmospheric pressures and high temperatures P is readily released from P2O5 [i.e. it is ‘volatile’; 5], but P is reasonably soluble in basaltic melts [6]. Here, we consider the role of P-bearing volcanic gas in condensation and gas/fluid-solid reactions. We observed apatite crystals attached to sulfate-silica rinds and decorating the interior walls of glass vesicles in ash from the 2018 Kilauea eruptions. These crystals appear to have formed after the primary phases as a result of gas-rich fluid reactions with solid surfaces (rinds or glass). We propose that surface Ca has reacted with P in the gas phase to form these crystals. To test this hypothesis we modelled the formation of apatite using a Gibbs Free Energy minimization approach from a starting composition that included relevant gas and solid phases. The modelling shows apatite is effectively produced from reactions between P-bearing gases and solids. These results indicate that sequestration of P in condensates or products of gas-solid reactions needs to be included in assessing the global P cycle and primary magmatic fluids may have more P than volcanic gases.
{"title":"Insight into the Global Phosphorus Cycle from Apatite in Ash from the 2018 Kilauea Eruptions","authors":"Penelope King, Emily Oborski, D. Damby","doi":"10.46427/gold2020.1321","DOIUrl":"https://doi.org/10.46427/gold2020.1321","url":null,"abstract":"Volcanic ash eruptions are recognised as an important source of phosporus (P) for the global P cycle, delivering P to soils and the ocean. At volcanoes, P is hosted in primary phases such as melt-precipitated apatite, glass and rarely other phases (e.g., sanidine with 5 wt% P at Tolbachik volcano [1]). Data for P in volcanic gases is scarce and suggests concentrations on the order of ~0.1-10’s ppm [2-3]. However, some condensates record higher P contents, as do some ash samples that include fragments formed by gas-solid (high T contact metamorphic) reactions in the conduit [4]. Interestingly, at atmospheric pressures and high temperatures P is readily released from P2O5 [i.e. it is ‘volatile’; 5], but P is reasonably soluble in basaltic melts [6]. Here, we consider the role of P-bearing volcanic gas in condensation and gas/fluid-solid reactions. We observed apatite crystals attached to sulfate-silica rinds and decorating the interior walls of glass vesicles in ash from the 2018 Kilauea eruptions. These crystals appear to have formed after the primary phases as a result of gas-rich fluid reactions with solid surfaces (rinds or glass). We propose that surface Ca has reacted with P in the gas phase to form these crystals. To test this hypothesis we modelled the formation of apatite using a Gibbs Free Energy minimization approach from a starting composition that included relevant gas and solid phases. The modelling shows apatite is effectively produced from reactions between P-bearing gases and solids. These results indicate that sequestration of P in condensates or products of gas-solid reactions needs to be included in assessing the global P cycle and primary magmatic fluids may have more P than volcanic gases.","PeriodicalId":12817,"journal":{"name":"Goldschmidt Abstracts","volume":"88 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76136634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Chemical Tracers at a Closed Milling Site with Natural and Anthropogenic Contaminants","authors":"B. Kimball, R. Arthur","doi":"10.46427/gold2020.1320","DOIUrl":"https://doi.org/10.46427/gold2020.1320","url":null,"abstract":"impact","PeriodicalId":12817,"journal":{"name":"Goldschmidt Abstracts","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75067225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Niezabitowska, J. Roszkowska-Remin, R. Szaniawski
{"title":"Magnetic Susceptibility Variations in Lower Paleozoic Shales of the Baltic Basin (Northern Poland) – A Helpful Tool for Regional Correlations and Decoding of Paleoenvironment Changes","authors":"D. Niezabitowska, J. Roszkowska-Remin, R. Szaniawski","doi":"10.46427/gold2020.1930","DOIUrl":"https://doi.org/10.46427/gold2020.1930","url":null,"abstract":"","PeriodicalId":12817,"journal":{"name":"Goldschmidt Abstracts","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75116454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. Noël, F. Brondolo, J. Druhan, W. Fan, A. Jew, Eleanor Spielman-Sun, Anthony Kovseck, J. Bargar, G. Brown
{"title":"Synchrotron X-Ray Imaging of Ion Transport in Unconventional Shales","authors":"V. Noël, F. Brondolo, J. Druhan, W. Fan, A. Jew, Eleanor Spielman-Sun, Anthony Kovseck, J. Bargar, G. Brown","doi":"10.46427/gold2020.1940","DOIUrl":"https://doi.org/10.46427/gold2020.1940","url":null,"abstract":"","PeriodicalId":12817,"journal":{"name":"Goldschmidt Abstracts","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72672830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Interest in the rare earth elements (REE) is on the rise because of their importance to the “green economy”. Specifically, REEs are used in manufacturing mobile phones, hybrid automobiles, magnets, and in wind power generation, among others. As such, these critical metals are likely candidates for future emerging environmental contaminants. Indeed, application of gadolinium diethylenetriamine-pentaacetic acid (Gd-DPTA), as a magnetic contrast agent for medical imaging has introduced orders of magnitude higher Gd concentrations to certain environments. The REEs are also chemical analogs of the radioactive actinide series elements, and thus can be used to provide a first order grasp of actinide fate and transport in the environment. Although aqueous complexation models for REEs are relatively robust, surface complexation models are more limited. Both are necessary to simulate the fate and transport of the highly reactive REEs in the environment. Here, we couple the one-dimensional advective-dispersive flow equation to an aqueous and surface complexation model for the REEs in a well-studied, confined aquifer from Texas, USA, to gain insights into the important processes that control the transport of REEs in groundwaters. The model also provides an understanding of how reactive transport of REEs impacts their fractionation patterns along flow paths as the composition of the groundwater evolves owing to biogeochemical reactions occurring within the aquifer. We also employ reaction path modeling to investigate REE fractionation pattern evolution in a stratified, “meromictic” estuary. Here, mixing of river water, submarine groundwater discharge, and coastal seawater, along with adsorption onto precipitating Mn oxides in the oxic surface waters followed
{"title":"Reaction Path and Reactive Transport Modeling of Rare Earth Elements: Insights into the Evolution of Fractionation Patterns","authors":"K. Johannesson, C. White, Segun B. Adebayo","doi":"10.46427/gold2020.1215","DOIUrl":"https://doi.org/10.46427/gold2020.1215","url":null,"abstract":"Interest in the rare earth elements (REE) is on the rise because of their importance to the “green economy”. Specifically, REEs are used in manufacturing mobile phones, hybrid automobiles, magnets, and in wind power generation, among others. As such, these critical metals are likely candidates for future emerging environmental contaminants. Indeed, application of gadolinium diethylenetriamine-pentaacetic acid (Gd-DPTA), as a magnetic contrast agent for medical imaging has introduced orders of magnitude higher Gd concentrations to certain environments. The REEs are also chemical analogs of the radioactive actinide series elements, and thus can be used to provide a first order grasp of actinide fate and transport in the environment. Although aqueous complexation models for REEs are relatively robust, surface complexation models are more limited. Both are necessary to simulate the fate and transport of the highly reactive REEs in the environment. Here, we couple the one-dimensional advective-dispersive flow equation to an aqueous and surface complexation model for the REEs in a well-studied, confined aquifer from Texas, USA, to gain insights into the important processes that control the transport of REEs in groundwaters. The model also provides an understanding of how reactive transport of REEs impacts their fractionation patterns along flow paths as the composition of the groundwater evolves owing to biogeochemical reactions occurring within the aquifer. We also employ reaction path modeling to investigate REE fractionation pattern evolution in a stratified, “meromictic” estuary. Here, mixing of river water, submarine groundwater discharge, and coastal seawater, along with adsorption onto precipitating Mn oxides in the oxic surface waters followed","PeriodicalId":12817,"journal":{"name":"Goldschmidt Abstracts","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72700247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Pang, Truong Tai Nguyen, Sun‐Lin Chung, S. Maruyama, T. Komiya, Y. Iizuka, Hao-Yang Lee
Many first-row transition elements (FRTE) are redox-sensitive, making them ideal candidates in exploring the redox states in magmatic systems. Because arc lavas in general are differentiated, it is challenging to apply proxies involving these elements to investigate the oxygen fugacity of sub-arc mantle. A cogenetic suite of arc magmas, wherein the most primitive members are in direct equilibrium with the mantle, is thus valuable because it gives an opportunity to examine source geochemistry and how elemental systematics changes with differentiation. Here, we document new geochemical analyses for picritic and basaltic lavas from the Solomon arc, SW Pacific with a specific focus placed on FRTE. The lavas have variable MgO with the picritic ones mostly in Fe/Mg exchange equilibrium with Fo 89-91 olivine. With MgO as a proxy for differentiation, Cr, Co and Ni behave compatibly, and V, Cu and Ga behave incompatibly. Iron and Zn might have partitioning behaviour intermediate between compatible and incompatible. Scandium gently increases with decreasing MgO before it plummets at ~8 wt.% MgO, consistent with the onset of clinopyroxene fractionation. The above trends indicate that the oxybarometric proxies V/Sc, V/Ga and Zn/Fe T can be applied to the picritic and relatively primitive basaltic lavas for oxygen fugacity estimation. The oxygen fugacity of the mantle source from which these lavas derived can be tightly constrained at FMQ to
{"title":"Behaviour of First-Row Transition Elements during Early Differentiation of Arc Magmas, Solomon Islands, SW Pacific: Implications for the Redox State of Sub-Arc Mantle","authors":"K. Pang, Truong Tai Nguyen, Sun‐Lin Chung, S. Maruyama, T. Komiya, Y. Iizuka, Hao-Yang Lee","doi":"10.46427/gold2020.2025","DOIUrl":"https://doi.org/10.46427/gold2020.2025","url":null,"abstract":"Many first-row transition elements (FRTE) are redox-sensitive, making them ideal candidates in exploring the redox states in magmatic systems. Because arc lavas in general are differentiated, it is challenging to apply proxies involving these elements to investigate the oxygen fugacity of sub-arc mantle. A cogenetic suite of arc magmas, wherein the most primitive members are in direct equilibrium with the mantle, is thus valuable because it gives an opportunity to examine source geochemistry and how elemental systematics changes with differentiation. Here, we document new geochemical analyses for picritic and basaltic lavas from the Solomon arc, SW Pacific with a specific focus placed on FRTE. The lavas have variable MgO with the picritic ones mostly in Fe/Mg exchange equilibrium with Fo 89-91 olivine. With MgO as a proxy for differentiation, Cr, Co and Ni behave compatibly, and V, Cu and Ga behave incompatibly. Iron and Zn might have partitioning behaviour intermediate between compatible and incompatible. Scandium gently increases with decreasing MgO before it plummets at ~8 wt.% MgO, consistent with the onset of clinopyroxene fractionation. The above trends indicate that the oxybarometric proxies V/Sc, V/Ga and Zn/Fe T can be applied to the picritic and relatively primitive basaltic lavas for oxygen fugacity estimation. The oxygen fugacity of the mantle source from which these lavas derived can be tightly constrained at FMQ to","PeriodicalId":12817,"journal":{"name":"Goldschmidt Abstracts","volume":"182 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74966745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The Biogeochemistry of Precious Metals; in Memorium of Frank Reith","authors":"F. Reith, Jeremiah Shuster, G. Southam","doi":"10.46427/gold2020.2187","DOIUrl":"https://doi.org/10.46427/gold2020.2187","url":null,"abstract":"","PeriodicalId":12817,"journal":{"name":"Goldschmidt Abstracts","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76379818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yarong Liu, Ruimin Wang, W. Ding, X. Lang, Kang-Jun Huang, B. Shen
{"title":"The Reversed Redox Zonation in the Early Cambrian Ocean: The Isotope Evidence from Pyritized Sponge Spicules","authors":"Yarong Liu, Ruimin Wang, W. Ding, X. Lang, Kang-Jun Huang, B. Shen","doi":"10.46427/gold2020.1621","DOIUrl":"https://doi.org/10.46427/gold2020.1621","url":null,"abstract":"","PeriodicalId":12817,"journal":{"name":"Goldschmidt Abstracts","volume":"474 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76473910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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