کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4733802 1357052 2010 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Relationship between fault growth mechanism and permeability variations with depth of siliceous mudstones in northern Hokkaido, Japan
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
پیش نمایش صفحه اول مقاله
Relationship between fault growth mechanism and permeability variations with depth of siliceous mudstones in northern Hokkaido, Japan
چکیده انگلیسی

In order to assess the influence of remote mean stress correlated with depth of burial on the principal mode of failure at fault tips during fault slip in a lithologically homogeneous, fractured rock mass, the growth mechanisms of strike-slip faults have been studied at outcrop-scale in the siliceous mudstones of northern Hokkaido, Japan. We take a multifaceted approach combining i) geological characterization of fractures by fracture mapping in outcrop and fracture logging of boreholes (drilling depth: ≤1020 m), ii) rock mechanical characterization by laboratory tests on core samples, and iii) theoretical analyses using the Griffith–Coulomb criterion. These suggested that the principal mode of failure in the mudstones is dependent, not only on rock strength, but also on remote mean stresses. During and/or after uplift and erosion the faults grew mainly by linking with adjacent faults via numerous splay cracks, formed by tensile failure above roughly 400 m depth. In contrast, below this depth, the faults grew predominantly by shear failure. Such growth mechanisms are consistent with the fact that hydraulic tests performed in boreholes show that highly permeable sections (hydraulic transmissivity: >10−5 m2/s) are restricted to depths of less than 400 m.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Structural Geology - Volume 32, Issue 11, November 2010, Pages 1792–1805
نویسندگان
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