Journal
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
Volume 123, Issue 12, Pages 11016-11030Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2018JB015982
Keywords
Chain Fracture Zone; transform fault; Mid-Atlantic Ridge; potential fields; gravity
Categories
Funding
- RCUK Natural Environment Research Council [NE/M003507/1]
- Horizon 2020
- European Research Council [GA 638665]
- National Science Foundation [OCE 1536400]
- NERC [NE/M003507/1, NE/M004643/1] Funding Source: UKRI
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The Chain Fracture Zone is a 300-km-long transform fault that offsets the Mid-Atlantic Ridge. We analyzed new multibeam bathymetry, backscatter, gravity, and magnetic data with 100% multibeam bathymetric data over the active transform valley and adjacent spreading segments as part of the Passive Imaging of the Lithosphere Asthenosphere Boundary (PI-LAB) Experiment. Analyses of these data sets allow us to determine the history and mode of crustal formation and the tectonic evolution of the transform system and adjacent ridges over the past 20Myr. We model the total field magnetic anomaly to determine the age of the crust along the northern ridge segment to better establish the timing of the variations in the seafloor fabric and the tectonic-magmatic history of the region. Within the active transform fault zone, we observe four distinct positive flower structures with several en echelon fault scarps visible in the backscatter data. We find up to -10mGal residual Mantle Bouguer Anomaly in the region of the largest positive flower structure within the transform zone suggesting crustal thickening relative to the crustal thinning typically observed in fracture zones in the Atlantic. The extensional/compressional features observed in the Chain Transform are less pronounced than those observed further north in the Vema, St. Paul, and Romanche and may be due to local ridge segment adjustments.
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