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Cooling Rates And The Depth Of Detachment Faulting At Oceanic Core Complexes: Evidence From Zircon Pb/U And (U-Th)/He Ages, C. B. Grimes, Michael Cheadle, Barbara John, P. W. Reiners, J. L. Wooden
Cooling Rates And The Depth Of Detachment Faulting At Oceanic Core Complexes: Evidence From Zircon Pb/U And (U-Th)/He Ages, C. B. Grimes, Michael Cheadle, Barbara John, P. W. Reiners, J. L. Wooden
Barbara John
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 degrees 20'N Transform, and Atlantis Massif at 30 degrees N). Closure temperatures for the Pb/U (similar to 800 degrees C-850 degrees C) and (U-Th)/He (similar to 210 …
Inherited Zircon And The Magmatic Construction Of Oceanic Crust, J. J. Schwartz, Barbara John, Michael Cheadle, C. Grimes, E. A. Miranda, J. L. Wooden, H.J.B. Dick
Inherited Zircon And The Magmatic Construction Of Oceanic Crust, J. J. Schwartz, Barbara John, Michael Cheadle, C. Grimes, E. A. Miranda, J. L. Wooden, H.J.B. Dick
Michael Cheadle
Meeting Abstract for “Inherited Zircon and the Magmatic Construction of Oceanic Crust,” Goldschmidt Conference Abstracts 2005, Geochronology of Tectonic Processes.