AsenicPPT學(xué)習(xí)教案

1、會(huì)計(jì)學(xué)1AsenicArsenic: environmental toxinore-forming elementrarely investigated 第1頁(yè)/共13頁(yè) the amount of As in different settings(g L-1)emerging settingopen ocean seawaterMOR BAB settingsIA shallow-water settingsthe amount of Asaround 1.72480.513865850第2頁(yè)/共13頁(yè)A. TemperatureB. PressureC. PHD. As mobility

2、and speciationE.reaction time and maturity of the systemF.diverse chemical reactionsG. 第3頁(yè)/共13頁(yè)第4頁(yè)/共13頁(yè)The relationship between the distribution of hydrothermal vents and the depthHydrothermal vents are distributed in the range of hundreds of meters to 5000 mThe hydrothermal vents in the mid-ocean r

3、idge area are distributed in the water depth of 2000-3000m第5頁(yè)/共13頁(yè)P(yáng)hase separation第6頁(yè)/共13頁(yè)Additional input of AsA. The system offshore in Montserrat: enrichment of As here may be caused by enhanced magmatic input (in the form of magmatic volatiles) during the eruptive cycle. B. Sediment-fluid intera

4、ction: an additional cause for As enrichment could be leaching from As-rich sediments, prior to discharge.(no evidence)第7頁(yè)/共13頁(yè)Concentration of As in different marine rocks and sedimentsThe difference in As concentration between andesites and dacites (0.5-5.8)from the IA systems and the MORBs (1.0)i

5、s slight第8頁(yè)/共13頁(yè)A.Hydrothermal fluids from shallow-water island-arc (IA) settings are mostly very high in As ，followed by fluids from deep-water hydrothermal systems in back-arc basins (BAB) ，and As concentration of mid-oceanic ridges (MOR) is comparably much lower .B.The only slightly higher bulk r

6、ock concentration of underlying acidic dacites and andesites from IA systems cannot be responsible for the overall much higher values of As compared to deep-water systems underlain by MORB. C.Phase separation produces a high Cl “brine” phase and a low Cl “vapor” phase. It is one of the most importan

7、t factors controlling the concentration of As.D.Additional input of As due to magmatic volatiles and sediment-fluid interaction has to be considered. 第9頁(yè)/共13頁(yè)FollowingplanA. Conversion process of arsenate (AsV) and arsenite (AsIII) in submarine hydrothermal fluidB. The influence of pH and biological effects on the change of the valence state of arsenic第10頁(yè)/共13頁(yè)1 Christian Breuer , Thomas Pichler . Arsenic in marine hydrothermal fluids. Chemical Geology 348 (2013) 214.2馬力. 基于地球化學(xué)模型對(duì)低溫?zé)嵋褐蠥u、As賦存狀態(tài)的研究D.中國(guó)地質(zhì)大學(xué)(北京),2017.3楊振林,丘寶