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Detachment and steep normal faulting in Atlantic oceanic crust west of Africa

Geology

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Abstract

Improved images of the internal structure of Early Cretaceous North Atlantic crust reveal both probable detachment faults and more steeply dipping normal faults. The detachment faults occur as subhorizontal structures passing ???1.5 km beneath fault blocks without offset; several steeper block-bounding faults appear to detach onto these structures. However, the detachments are bounded to the west (ridgeward) by presumably younger, more steeply west-dipping normal faults. In one possible interpretation, the detachment and the steep faults belong to the same "rolling-hinge" extension system. An intriguing alternative is that a phase of detachment faulting, perhaps related to increased magmatic activity, was succeeded by localized amagmatic extension along steeper and more deeply penetrating faults.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Detachment and steep normal faulting in Atlantic oceanic crust west of Africa
Series title:
Geology
Volume
24
Issue:
9
Year Published:
1996
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geology
First page:
811
Last page:
814
Number of Pages:
4