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Teng Deng

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  1. Hello I try to use React to model the water-rock interaction, but I ran in to a problem. First of all, I use SpecE 8 to balance the fluids, and the fluid was produced for Reaction. In React, I use the fluid to react with Abite, Anorthite, Phlogopite, Annite, Muscovite, Quartz, Maxium_Microline, pyrite and Daphinite-14. In the initial fluid (processed by SpecE 8): pH = 4.5, UO2++ = 15.2 mg/kg (component) However, in the Gtplot file produced by React, the initial values are (Rxn progress = 0 ) pH = 4.032, UO2++ = 0.0001326 mg/kg (component in f
  2. Hello Jia Wang Thanks for your time and patience. I believe your suggestion “Start with a simple system and then build more complexity with it” is quite useful. Following your suggestions, I add the components one by one. (1) At last, I found that swap pyrite with Fe++ would cause the convergence error (see the SpecE8 file “Fig. 16A-V4”). (2) If I give a certain value like 30 ppm for Fe++ as shown in Table 4.1, the convergence error is gone. However, the Cu++ contents are incredibly low (7*e-7 ppm), much lower than the one in Table 4.1. Consequently, I do not thi
  3. Hello Jia Wang Of course I can balance the reaction with SpecE8 using the data in Table 4.1, since they are the result after processed from the raw data by geochemical analysis. The geochemical results are what I show above. T=145 °C, CH4=300 ppm, Cl-=4.81 mol/kg, Ca2+ =0.5 mol/kg,Mg2+ =0.12 mol/kg, K+=0.1 mol/kg, Na+=3.5 mol/kg By studying phase diagram, we got other key parameters: pH=4.4, log fO2=-57, H2S= 2*10-3 mol/kg In addition, there are also some minerals buffering the fluids. My question is: How can I get the data in Table 4.1 with the chemic
  4. Hello Jia Wang In order to better illustrate my problem, I would like to give more details. I am current reconstruct the modelling in Perry, (2016). If you want to know more details, please see attached. There are several models in this paper, and what I am showing is the first model (reduced-sufur). The fluid initial of this model used by the author is shown in Table 4.1 of the page 155. The paragenesis sequence is shown in Fig.4.4 of the page 141. The minerals of the ore deposit is shown there. In addition, since the fluids have been through sandstones, so they have bee
  5. Hello Jia Wang Thanks for your explanation. I have reattached the file. Pb-Zn deposit-initial fluid.sp8
  6. Hello guys As a GWB user to study the fluid rock interaction in hydrothermal ore deposit, one of the most important initial work is to obtain the composition of fluids. Generally, we use LA-ICP-MS analysis to get the chemical composition of ore fluids. But the data have to be processed with SpecE8 before used as the input file for React. However, the processing by SpecE8 is seldom detailed shown in the paper, confusing starters like me a lot. Here I’d like to show a typical example, and wish to get some help. According to microthermometry and LA-ICPMS analysis of fluid inclusion
  7. Thanks very much for telling me that there are input files in the GBRM scripts. It is really helpful. However, even I use the Ch09-SeO4 in the example file. The obtained >L: SeO4-- are 2.465e-7 molality, different from the book (0.49 * 10-3 umol/g, i.e., 4.9 * 10-7 molality) Is it because of my understanding incorrect? Best wishes Teng Deng Ge
  8. I was trying reconstruct the examples in Pages 150-154 of the book Geochemical and Biogeochemical Reaction Modelling (Second Edition). These examples are about absorption and ion exchanges. The results I got are different from those in the book. I have attached the SpecE and database files. Could you please check and give me some help? CaMgNa_Ix.sdat fresh water.sp8 Freundlich-SeO4--.sdat Kd—SeO4-.sdat Langmuir-SeO4--.sdat sea water.sp8 SeO4--Freundlich.sp8 SeO4--Kd.sp8 SeO4--Langmuir.sp8
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