کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4683960 1635381 2016 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Modelling the structural controls of primary kaolinite formation
ترجمه فارسی عنوان
مدل سازی کنترل های ساختاری تشکیل اولیه کائولینیت
کلمات کلیدی
کائولنیت؛ شبکه شکستگی گسسته؛ نفوذ ساختاری؛ کائولنیزه کردن؛ مدلسازی سه بعدی
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
چکیده انگلیسی


• The relationship between kaolinisation and structural features is defined.
• The chosen study location is described and measurements demonstrated.
• A discrete fracture network is modelled to locate zones of high fluid circulation.
• Zones of high permeability match well with zones of advanced kaolinisation.

An abundance of kaolinite was formed within the St. Austell outcrop of the Cornubian batholith in Cornwall, southwest England, by the hydrous dissolution of feldspar crystals. The permeability of Cornish granites is low and alteration acts pervasively from discontinuity features, with montmorillonite recognised as an intermediate assemblage in partially kaolinised material. Structural features allowed fluids to channel through the impermeable granite and pervade deep into the rock. Areas of high structural control are hypothesised to link well with areas of advanced alteration. As kaolinisation results in a loss of competence, we present a method of utilising discontinuity orientations from nearby unaltered granites alongside the local tectonic history to calculate strain rates and delineate a discrete fracture network. Simulation of the discrete fracture network is demonstrated through a case study at Higher Moor, where kaolinite is actively extracted from a pit. Reconciliation of fracture connectivity and permeability against measured subsurface data show that higher values of modelled properties match with advanced kaolinisation observed in the field. This suggests that the technique may be applicable across various industries and disciplines.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geomorphology - Volume 268, 1 September 2016, Pages 48–53
نویسندگان
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