Cooling Rates and the Depth of Detachment Faulting At Oceanic Core Complexes: Evidence from Zircon Pb/U and (U-Th)/He Ages
Oceanic detachment faulting represents a distinct mode of seafloor spreading at slow spreading mid-ocean ridges, but many questions persist about the thermal evolution and depth of faulting. We present new Pb/U and (U-Th)/He zircon ages and combine them with magnetic anomaly ages to define the cooling histories of gabbroic crust exposed by oceanic detachment faults at three sites along the Mid-Atlantic Ridge (Ocean Drilling Program (ODP) holes 1270D and 1275D near the 15°20'N Transform, and Atlantis Massif at 30°N). Closure temperatures for the Pb/U (~800°C-850°C) and (U-Th)/He (~210°C) isotopic ...
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Grimes, C. B.; Cheadle, Michael; John, Barbara; Reiners, P. W.; Wooden, J. L.; Grimes, C. B.; Cheadle, Michael; John, Barbara; Reiners, P. W.; Wooden, J. L.
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Mylonitic Deformation at the Kane Oceanic Core Complex: Implications for the Rheological Behavior of Oceanic Detachment Faults Author(s):Hansen, L. N.; Cheadle, Michael J.; John, Barbara E.; Swapp, S. M.; Dick, H. J. B.; Tucholke, Brian E.; Tivey, Maurice A.; Hansen, L. N.; Cheadle, Michael J.; John, Barbara E.; Swapp, S. M.; Dick, H. J. B.; Tucholke, Brian E.; Tivey, Maurice A.Date:2013-08-23The depth extent, strength, and composition of oceanic detachment faults remain poorly understood because the grade of deformation-related fabrics varies widely among sampled oceanic core complexes (OCCs). We address this ...
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Cooling History and the Depth of Detachment Faulting at the Atlantis Massif Oceanic Core Complex, The Author(s):Schoolmeesters, Nicole; Cheadle, Michael J.; John, Barbara E.; Reiners, Peter W.; Gee, Jeff; Grimes, Craig B.; Schoolmeesters, Nicole; Cheadle, Michael J.; John, Barbara E.; Reiners, Peter W.; Gee, Jeff; Grimes, Craig B.Date:2012-10-25Oceanic core complexes (OCCs) are domal exposures of oceanic crust and mantle interpreted to be denuded to the seafloor by large slip oceanic detachment faults. We combine previously reported U-Pb zircon crystallization ...