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Title: Chlorite dissolution kinetics at pH 3–10 and temperature to 275°C

Sheet silicates and clays are ubiquitous in geothermal environments. Their dissolution is of interest because this process contributes to scaling reactions along fluid pathways and alteration of fracture surfaces which could affect reservoir permeability. Here, in order to better predict the geochemical impacts on long-term performance of engineered geothermal systems, we have measured chlorite dissolution and developed a generalized kinetic rate law applicable over an expanded range of solution pH and temperature. Chlorite, (Mg,Al,Fe) 12(Si,Al) 8O 20(OH) 16, commonly occurs in many geothermal host rocks as either a primary mineral or alteration product.
Authors:
 [1] ;  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-680118
Journal ID: ISSN 0009-2541
Grant/Contract Number:
AC52-07NA27344; LLNL-JOUR-680118
Type:
Accepted Manuscript
Journal Name:
Chemical Geology
Additional Journal Information:
Journal Volume: 421; Journal Issue: C; Journal ID: ISSN 0009-2541
Publisher:
Elsevier
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 15 GEOTHERMAL ENERGY; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; chlorite; clinochlore; sheet silicate; phyllosilicate; dissolution; kinetics; reaction affinity; geothermal
OSTI Identifier:
1345334
Alternate Identifier(s):
OSTI ID: 1397575