کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4730817 1640387 2014 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Fracture patterns in successive folding in the western Sichuan basin, China
ترجمه فارسی عنوان
الگوهای شکستگی در تاخیر متوالی در حوضه سیشو غرب، چین
کلمات کلیدی
الگوی شکستگی، تاشو، تغییر شکل دهی حوضه سیشو غرب
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
چکیده انگلیسی


• A detailed fracture survey was carried out in the western Sichuan basin, China.
• Fracture patterns at different stages of folding deformation were analyzed.
• A model of fracture patterns and rock deformation in successive folding was built.
• The orientation of fractures would vary along with subsequent folding.
• The use of polar stereonet in the field provided precise evidence for exact analysis.

A detailed field survey of fractures was carried out in the Pingluoba and adjacent anticlines in the western Sichuan basin to discuss fracture development during progressive folding, including the relative timing of fracture formation, the successive deformation in a rock layer, the distribution of fracture sets in folds, and the variation of fractures along with the subsequent deformation of rock layers. Based on a comparison of the diverse fracture patterns in folded strata at different stages of fold growth (horizontal, low-angle dipping, high-angle dipping, and vertical layers), a model of fracture development related to fold evolution was built up. It is suggested that the strata were initially under uniform compression, and two sets of planar conjugate shear fractures were formed, the orientations of which would vary along with the subsequent folding of strata. Then, during progressive folding, the deformation of rheologically hard layers was controlled by tangential longitudinal strain, inducing the development of a set of tensile fractures that struck parallel to the fold axis. Layer parallel shear was predominant in the soft layers, and two sets of bedding-oblique dextral shear fractures intersecting with the bedding at angles of 25–40° and 160° were developed. In the progressive folding process, the shear fractures were developed later than the tensile fractures. A polar stereonet of fractures was generated and applied to improve the efficiency and accuracy of fracture identification in the field, providing precise evidence for the exact analysis of fracture patterns and rock deformation.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Asian Earth Sciences - Volume 81, 25 February 2014, Pages 65–76
نویسندگان
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