Sedimentation Rates Test Models of Oceanic Detachment Faulting

Parnell-Turner, Ross and Cann, Johnson and Smith, Deborah K. and Schouten, Hans and Yoerger, Dana and Palmiotto, Camilla and Zheleznov, Alexey and Bai, Hailong (2014) Sedimentation Rates Test Models of Oceanic Detachment Faulting. Geophysical Research Letters, 41. pp. 7080-7088. ISSN 0094-8276 DOI

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Long-lived detachment faults play an important role in the construction of new oceanic crust at slow-spreading mid-oceanic ridges. Although the corrugated surfaces of exposed low-angle faults demonstrate past slip, it is difficult to determine whether a given fault is currently active. If inactive, it is unclear when slip ceased. This judgment is crucial for tectonic reconstructions where detachment faults are present, and for models of plate spreading. We quantify variation in sediment thickness over two corrugated surfaces near 16.5°N at the Mid-Atlantic Ridge using near-bottom Compressed High Intensity Radar Pulse (CHIRP) data. We show that the distribution of sediment and tectonic features at one detachment fault is consistent with slip occurring today. In contrast, another corrugated surface 20 km to the south shows a sediment distribution suggesting that slip ceased ~150,000 years ago. Data presented here provide new evidence for active detachment faulting, and suggest along-axis variations in fault activity occur over tens of kilometers.

Item Type: Article
Uncontrolled Keywords: 2014AREP; IA68;
Subjects: 02 - Geodynamics, Geophysics and Tectonics
Divisions: 02 - Geodynamics, Geophysics and Tectonics
08 - Green Open Access
Journal or Publication Title: Geophysical Research Letters
Volume: 41
Page Range: pp. 7080-7088
Identification Number:
Depositing User: Sarah Humbert
Date Deposited: 03 Oct 2014 11:23
Last Modified: 28 Apr 2015 00:00

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