Goldschmidt Abstracts最新文献_第8页

Phosphorus Transformation in Saharan Dust during Trans-Atlantic Dust Transport 跨大西洋沙尘运输过程中撒哈拉沙尘中的磷转化

Goldschmidt Abstracts Pub Date : 2020-01-01 DOI: 10.46427/gold2020.3213

Mengqian Zhu, Than T N Dam, A. Angert, Laura Bigio, O. Mayol, G. Santos-Figueroa, C. Pio

引用次数: 0

Heterogeneities Evolving in Earth’s Mantle due to Melt Depletion 熔体耗竭引起的地幔非均质演化

Goldschmidt Abstracts Pub Date : 2020-01-01 DOI: 10.46427/gold2020.1939

L. Noack, A. Balduin

引用次数: 0

Insight into the Global Phosphorus Cycle from Apatite in Ash from the 2018 Kilauea Eruptions 从2018年基拉韦厄火山喷发的火山灰中磷灰石对全球磷循环的洞察

Goldschmidt Abstracts Pub Date : 2020-01-01 DOI: 10.46427/gold2020.1321

Penelope King, Emily Oborski, D. Damby

{"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}

引用次数: 0

Chemical Tracers at a Closed Milling Site with Natural and Anthropogenic Contaminants 封闭磨矿场所的化学示踪剂与自然和人为污染物

Goldschmidt Abstracts Pub Date : 2020-01-01 DOI: 10.46427/gold2020.1320

B. Kimball, R. Arthur

引用次数: 0

Magnetic Susceptibility Variations in Lower Paleozoic Shales of the Baltic Basin (Northern Poland) – A Helpful Tool for Regional Correlations and Decoding of Paleoenvironment Changes 波罗的海盆地(波兰北部)下古生界页岩磁化率变化——区域对比与古环境变化解码的有用工具

Goldschmidt Abstracts Pub Date : 2020-01-01 DOI: 10.46427/gold2020.1930

D. Niezabitowska, J. Roszkowska-Remin, R. Szaniawski

引用次数: 0

Synchrotron X-Ray Imaging of Ion Transport in Unconventional Shales 非常规页岩中离子输运的同步加速器x射线成像

Goldschmidt Abstracts Pub Date : 2020-01-01 DOI: 10.46427/gold2020.1940

V. Noël, F. Brondolo, J. Druhan, W. Fan, A. Jew, Eleanor Spielman-Sun, Anthony Kovseck, J. Bargar, G. Brown

引用次数: 1

Reaction Path and Reactive Transport Modeling of Rare Earth Elements: Insights into the Evolution of Fractionation Patterns 稀土元素的反应路径和反应输运模型:对分馏模式演变的洞察

Goldschmidt Abstracts Pub Date : 2020-01-01 DOI: 10.46427/gold2020.1215

K. Johannesson, C. White, Segun B. Adebayo

{"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}

引用次数: 0

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 西南太平洋所罗门群岛弧岩浆早期分异过程中第一排过渡元素的行为:对次弧地幔氧化还原状态的启示

Goldschmidt Abstracts Pub Date : 2020-01-01 DOI: 10.46427/gold2020.2025

K. Pang, Truong Tai Nguyen, Sun‐Lin Chung, S. Maruyama, T. Komiya, Y. Iizuka, Hao-Yang Lee

{"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}

引用次数: 0

The Biogeochemistry of Precious Metals; in Memorium of Frank Reith 贵金属的生物地球化学研究纪念弗兰克·里思

Goldschmidt Abstracts Pub Date : 2020-01-01 DOI: 10.46427/gold2020.2187

F. Reith, Jeremiah Shuster, G. Southam

引用次数: 0

The Reversed Redox Zonation in the Early Cambrian Ocean: The Isotope Evidence from Pyritized Sponge Spicules 早寒武世海洋逆氧化还原带:来自黄铁矿化海绵针状体的同位素证据

Goldschmidt Abstracts Pub Date : 2020-01-01 DOI: 10.46427/gold2020.1621

Yarong Liu, Ruimin Wang, W. Ding, X. Lang, Kang-Jun Huang, B. Shen

引用次数: 0