Science topics: GeoscienceGeochemistryGeochemical Modeling
Geochemical Modeling - Science topic
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Questions related to Geochemical Modeling
Hi, I would like to know is there any online course of low temperature geochemistry including geochemical modelling, if there how to access them.
Thanks in advance
I want to know how to plot factor scores extracted from a geochemical dataset and plot back on the map? For example map for Factor 1 etc... In SPSS I do not see any option where I can relate factor scores back to sample id or location
I want to learn different geochemical modelling programmes like PHREEQC, DISSOLVE etc. Is there any tutorial website to learn these modelling?
In PHREEQC, I am not able to know, How to make an input file and analysis of output file?
If there are any tutorials please let me know.
Thank you in advance
Tutorial /learning materials on how to perform inverse geochemical modelling using PREEQC Interactive?
Came across an article where authors used TOUGHREACT for geochemical modelling.
I'm familiar with Geochemical data analysis software such as GCDKit, PetroGraph, and Petroplot etc.
which one is best and suitable for doing Geochemical Modelling of Igneous Processes?
I need details of both open source and commercial software.
I've already installed and loaded the package in Rstudio, but
I'd like to learn how to use the package from the database loading to the output results.
my sincere gratitude.
I have already install and load the package on Rstudio interface (R 3.5.3), but I cannot load the Database.
I want to know how to use the package from loading Database to output results.
Thanks in advance.
I just started geochemical modeling and this simple thing is really frustrating because all videos are for people who already have the experience
Could someone provide the formula to calculate a Pb model age?
I am aware that Isoplot function "SingleStagePbT" calculates a model age relative to the Stacey-Kramers curve, but I would like to know the formula behind the calculation (in addition, that would allow me to calculate model ages relative to other curves/models).
Thanks in advance!
I am working on geochemical modeling of titanium dissolution in aqueous solutions, it would be a great help if you kindly help in finding the aqueous species database.
Could you please find the attached image and let me know if the presented data can show any weathering in the glass. Based on my understanding, the glass in the structure of my materials remained intact as the bump in the XRD test results is stable while the aggregates are subjecting to weathering conditions (4m, 4Y, 10Y, 15Y are denoting 4 months, 4 years, 10 years, and 15 years of weathering of the same source of andesite materials).
I was wondering if you could let me what can be interpreted from the pick of weathered materials around 20 degrees (4.5 Angstrom). Can it be related to any clay materials or any sign of weathering?
I am looking for a software that can run geochemical modelling of DETA (diethylenetriamine), I have tried OLI, but it requires the input of new data.
Any suggestion is appreciated!
We are working on Damavand quiescent volcano (Iran). We have done the geochemical modeling and thermodynamic simulations on the major and trace element as well as literature isotopic data. However i want to do the more isotopic analysis (Sr,Nd, Pb) on my selected samples. We are looking for a person to do the isotopic analysis and join us to write the manuscript.
From fine geomaterials, I mean those materials pass sieve 200.
I know in the last cycle of weathering Hematite and Goethite may govern the color ranges, is there any other minerals in the middle way of weathering that may affect the color of geomaterials?
To qualify the contribution of three end-members (seawater, groundwater and treated wastewater, whose concentrations are known) in the aquifer system, I used Cl and Br as tracers in a mass-balance equation.To confirm the end-members, I applied eigenanalysis (PCA) and the plot between the two tracers. From the plot, half of the samples fell within the mixing “envelope” defined by the end-members. The other half were forced based on some calculations.
1. Is the mixing ratio of these two chemical species enough? I am aware it can be several end-members, but I have particular interest to estimate the fraction of these end-members.
2. Shall I exclude the outliers?
Thank you in advance for your help
I want to do some modelling in order to see if different degrees of partial melting had (or not) some influence on the chemical variability of granite samples (in this case I-type granites, therefore, derived from partial melting of the lower crust). For this, I'm considering a batch melting process. However, I'm not sure which modal composition of the residual solid should be assumed in the calculation of bulk distribuition coefficients.
Actually, I need to do geochemical mapping of the Garo and Khasi hills in Meghalaya and crop out the potential/prospect areas for Uranium. Please help me with recently published papers so that plan my ideas before going for mapping ...
I am trying to develop a conceptual approach to collect data from riverine and lake waters in order to confirm/estimate the natural geochemical background concentration values of PAHs. I am trying to state the best locations for monitoring stations and the best time intervals for sampling. I need to collect data within one year (between January and December). I have the data from at least 10 years but there were different reasons for putting the sampling locations in these places but the database for PAHs concentrations does exist. So this research programme is to confirm the information and to help formulate conclusions.
Can anyone recommend any papers on developing a metodology of determining the best location pattern for such research? What should I take into account when planning sampling locations? How many samples from one place should I take?
In the guidelines for thermodynamic sorption modelling as outlined in the NEA Sorption Project Phase III report (http://bit.ly/2dhowYs) it is recommended that surface site densities be normalized to a reference site density common for all minerals when formulating surface complexation models.
For a surface complexation reaction between, say a metal cation and a surface binding site, this makes sense and it is easy to demonstrate that altering the site density necessitates an adjustment of the Kint binding constant to obtain the same sorption edge for a given fixed mass and surface area of sorbent (Since Kint values are always calibrated against an assumed, or measured site density when fitting to macroscopic sorption data).
Applying the corresponding correction to surface site protolysis constants (pKa's), however, implies an altered delta_pKa (although unaltered pHpzc) which gives rather different surface charging characteristics. Normalized pKa values give an altered shape for the surface charge inflection point around the pHpzc which makes it very difficult to reconcile a calculated sorption edge with the corresponding sorption edge calculated at the original site density (see attached pdf). The only way to obtain a match with the original sorption edge in calculations seems to be to normalize the metal binding reactions and leave the protolysis constants as they are irrespective of binding site density used in the calculation.
Sverjensky and Sahai's paper (1996) and Sverjenksy's (2003) paper on standard states, (http://dx.doi.org/10.1016/0016-7037(96)00207-4 & http://dx.doi.org/10.1016/S0016-7037(02)01074-8), however, seem to indicate pretty clearly that there is no universally valid delta_pKa that can be given without invoking a reference site density, so I'm wondering whether I have missed something fundamental with the Sverjensky-Kulik normalization theory?
In the PM-normalized diagram, my data for some basaltic rocks show slightly positive Nb-Ta anomalies. They all show positive Pb anomaly but no correlation of MgO versus 87Sr/86Sr and 143Nd/144Nd?
I am looking forward to your help. Thanks in advance.
i mean the use of PHREEQC model without the coupling of other hydrological (maybe?) models.
As we know CuBr2 and CuCl2 are hygroscopic in nature. In order to make films using these precursors. With in 2 days it will take water molecules from environment. Usually people make these films in Ar atmosphere in glove box. Is there any remedy to the films with out using glove box ? i mean is there any method such as adding additives or solvent treatment ?
Hi there, I'm using PHREEQC to model the speciation of salts in historical water quality data. Can someone please provide a link to a guide/literature on interpreting the results? As well as info on what steps to follow to ensure the validity of the results (e.g. charge balance)?
I have some diabase samples (SiO2=47-53 wt. %, MgO=6-10 wt. % and TiO2=0.7-1.2 wt. %), which consist of mainly clinopyroxene and plagioclase. There is no olivine and orthopyroxene appeared in the thin section. How could I calculate the melting temperature and pressure of the diabase samples?
Thanks for your help!
With best regards
My goal is study to achieve a position of mineralization, geochemical zonality and erosion level of a deposit. Does anybody have additional information about it and its relation with vertical geochemical zonality?
I have concentration data on the volatile chlorinated hydrocarbons (VOC CHCs) in the groundwater as mg/L. The VOC CHCs will be stripped from the groundwater by using an air stripper, hence, you get an off-gas waste stream that contains these VOC CHCs. From here, I would like to know how to get its concentration in the off-gas waste stream (mg/m3) so I could obtain its ppmv. This information is important for me so I could design a carbon bed adsorber. Can anyone help? Really appreaciate it.
Consider a situation that we laid two different soils as a foundation of a road (as a base courses). Both of them pass the initial criteria (for example the same compaction) and based on the employed tests, they expected to have the same performance over time. But, it turned out that after subjecting to traffic loading, one of them deteriorates more rapidly. So this fact makes me get the impression that something, like a chemical reaction between the solid and fluid phase of the soil, may produce this change in performance.
I'm unsure of how to use this software. I've seen an example of aqueous dissolution of quartz but this method doesn't seem to translate across
I want to study the low temperature magnetic properties of my samples. The samples include basalt and weathered basalt clays. These clays are trapped from upper lava flows and show baking effect. Few clay samples show high SP magnetic and hematite concentration. I have read literatures and found that two methods are commonly used for low temperature magnetic properties, 1) Induced SIRM (of 2.5 T) at room temperature (~300K) and then measurements are carried out in zero field from 300-5K and 5-300K cycle; 2) From 300 to 5K zero field cool measurement which is followed by induction of SIRM (of 2.5 T) at 5 K and then zero field measurement from 5 to 300K. Researchers have used these methodologies according to their objectives. Several researchers have used both the methods for theoretical objectives. I want to ask the experts which method will be more suitable for my samples. Your responses will be highly acknowledged.
I want remove sulphate, carbonate and calcium ions with CaCl2, HCl and H2SO4 in a solution containing Ca2+, Mg2+, Na+, K+, CO3 2-, SO4 2- and Cl- ions, respectively. How I can find out required amounts of this salt and acids as well as amount of forming compounds with PHREEQC program, finally?
the regional empirical factor will help me to estimate TOC in shale reservoir
Does diffusion occur at temperatures as low as 60 °C at all?
When it come to batch dissolution experiment (for water-rock interaction study), most authors have selected igneous rocks, sedimentary rocks and minerals formed under igneous conditions. Is there any special reason for that? Is there any article for the same experiment where metamorphic rocks were used?
Attached is a photomicrograph of gabbro. In the center a plagioclase phenocryst occurs that includes many clinopyroxene and hornblende minerals. The phenocryst was albitized. The matrix around the plagioclase phenocryst consists of clinopyroxene, hornblende and plagioclase. Some clinopyroxene and hornblende were altered to chlorite. Many of the matrix plagioclases consist of a dark or clouded core, with fine ferromagnesian minerals included, and a clear rim. My question is: how were these phenocryst and matrix plagioclases (core and rim) formed?
I would like to ask if there is any paper explaining how the surface hydrology affects the geochemical modeling (PHREEQC)?
I have some pyroxenites with typical cumulatic texture, if I want to calculate the equilibrium melts with these pyroxenites or cumulates, how could I deal with it? If anyone had done this, please tell me some ways or some references. Thank you.
What are possible factors based upon which we decide to use coupled or decoupled model?
Is there any information available for the small small caves present in Mizoram (its formation and geochemistry)?
I need some program to tracer inversion (TRINV) and forward modeling (TRCOOL program) as well as the handbook to use this program.
Which other software do batch reactions (for geochemistry) with an equilibrium constant based method? Are they providing a COM interface like iPHREEQC?
Geochemical Modelling of a deposit and estimating the level of erosion in the early stage of exploration will lead to gain optimal results and save the expenditure. The most important argument for the predictive appraisal of an ore occurrence or deposit and the commencing of exploration operations at it is the evaluation of the erosion level. In our case, the models are underlain by axial geochemical zoning, which is now regarded as an axiom. So I am interested in having linked with those who have already worked on this crucially applied topic of exploration.
I am working on effect of the water-rock interaction on the cleavage and fracture filling of granitic rock
Hydro-geochemical exploration of hidden uranium bodies is often based on redox conditions and speciation to determine U mobility. We propose here a pure multi-variate analysis model to identify water types and the corresponding mixing model. I am currently working on coupling the two approaches as redox fronts can be identified from factor maps. Any opinion, experience or work welcome to foster discussion, what would be your suggestions to help me move forward ?
I need to generate thermodynamic stability diagrams (log (aMg/aH) vs. log H4SiO4, log (aCa/aH) vs. H4SiO4 etc.) based on groundwater chemical samples to find out the stability fields of dissolution.
The formula of fractional melting and batch melting models are Cs/Co=(1-F)^(1/D-1) and Cs/Co=D/[D+F(1-D)] respectively.
Where the bulk partition coefficient D is determined from modal abundances of olivine (ol), orthopyroxene (opx), clinopyroxene(cpx), and spinel(sp), and mineral/melt partition coefficients.
My question is: where to get the modal abundance of primary mantle/depleted mantle? And which modal abundance should I choose? The volume percentage or weight percentage of each minerals in primary mantle/depleted mantle.
I did estuarine surface sample geochemical analysis. In that analysis I followed old methods of analytic procedure.
I am looking for a way to calculate the Eh of fluids used in a biodegradation experiment. We are without a redox electrode but have measurements for dissolved oxygen, pH and temperature. Any info would be a great help.
Values of free molecular diffusion coefficients in water needed. Necessary for the calculation of the retardation factor Rf of the arsenic anions in the soil.
It's for an OIB like basalt modelling.
How can LLD of a typical silica under-saturated magma (basanite / alkali olivine basalt) be described, like the Carmichael's paper (1964) on Thingmuli for oversaturated liquids?