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https://repositorio.ufba.br/handle/ri/8392
metadata.dc.type: | Artigo de Periódico |
Título : | Normal fault geometry related to sediment compaction and burial |
Otros títulos : | Journal of Structural Geology |
Autor : | Davison, Ian |
metadata.dc.creator: | Davison, Ian |
Resumen : | Field observations are presented on meso-scale normal faults and sandstone dikes which cross-cut
turbidites in the petroliferous Rec6ncavo Basin situated in Bahia, NE Brazil. Two discrete phases of normal
faulting occurred. It is argued that the first was probably active during the first 200 m of burial. Compaction
estimates from folded sandstone dikes and the accommodation patterns of shale bedding planes around
ball-and-pillow structures were made. First-phase fault profiles were initially reasonably straight but refraction
on the fault planes increased due to the differing compaction between sandstone and shale. The later phase of
faulting occurred at a greater depth, with steeper fault dips and strong refraction of fault planes at lithological
boundaries. This greater fault refraction is probably the result of burial and diagenesis, which increased the
difference in theological properties between sandstone and shale before faulting occurred. Thus, complex
superposed fault geometries may be developed by changing theological properties and stress conditions during
progressive burial. It is shown that sandstone dikes were not always intruded vertically. Injected dikes cannot be
used in the same manner that Neptunian dikes are conventionally used to estimate tectonic strain, if independent
evidence of the original orientation of the dike is not available. |
Editorial : | Journal of Structural Geology |
URI : | http://www.repositorio.ufba.br/ri/handle/ri/8392 |
Fecha de publicación : | 1987 |
Aparece en las colecciones: | Artigo Publicado em Periódico (IGEO)
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