Making a Crust

  title={Making a Crust},
  author={P. Michael and M. Cheadle},
  pages={1017 - 1018}
Dating zircons from the mid-Atlantic ridge provides clues about how the oceanic crust is formed. 
On the occurrence, trace element geochemistry, and crystallization history of zircon from in situ ocean lithosphere
We characterize the textural and geochemical features of ocean crustal zircon recovered from plagiogranite, evolved gabbro, and metamorphosed ultramafic host-rocks collected along present-day slowExpand
Dissolution-reprecipitation of igneous zircon in mid-ocean ridge gabbro, Atlantis Bank, Southwest Indian Ridge
Abstract Zircons recovered from oceanic gabbro exposed on Atlantis Bank, Southwest Indian Ridge, typically display oscillatory and sector zoning consistent with igneous crystallization from maficExpand
Petrogenesis of a composite dike system in the Wadi Rimthi area, South Sinai, Egypt
  • A. Ragab
  • Geology
  • Arabian Journal of Geosciences
  • 2019
Composite dike systems are a common feature in the basement complex of the Egyptian Eastern Desert and Sinai. These dike systems cut several lithological units, but mostly concentrated inExpand
Significance of assimilation and fractional crystallization (AFC) process in the generation of basaltic lava flows from Chhotaudepur area, Deccan Large Igneous Province, NW India
Basaltic and basaltic andesitic flows have been identified from the Chhotaudepur area in the Deccan Large Igneous Province. The $$\hbox {SiO}_{2}$$SiO2 content of these flows varies from 46.7 to 53.7Expand


Zircon Dating of Oceanic Crustal Accretion
High-precision uranium-lead dating of zircons in gabbros from the Vema Fracture Zone on the Mid-Atlantic Ridge reveals that the crust there grew in a highly regular pattern characterized by shallow melt delivery, suggesting that two distinct modes of crustal accretion occur along slow-spreading ridges. Expand
Dating the Growth of Oceanic Crust at a Slow-Spreading Ridge
Nineteen uranium-lead zircon ages of lower crustal gabbros from Atlantis Bank, Southwest Indian Ridge, constrain the growth and construction of oceanic crust at this slow-spreading midocean ridge.Expand
Do the trace element compositions of detrital zircons require Hadean continental crust
The trace element compositions of Hadean zircons have been used in two ways to argue for the existence of Hadean continental crust. One argument is based on low crystallization temperatures of HadeanExpand
Trace element chemistry of zircons from oceanic crust: A method for distinguishing detrital zircon provenance
We present newly acquired trace element compositions for more than 300 zircon grains in 36 gabbros formed at the slow-spreading Mid-Atlantic and Southwest Indian Ridges. Rare earth element patternsExpand
Constraining crustal emplacement processes from the variation in seismic layer 2A thickness at the East Pacific Rise
Abstract A stochastic model for the emplacement of dikes and lava flows at a fast spreading ridge can generate an upper oceanic crustal structure similar to that observed in seismic data from theExpand
Determining the cooling history of in situ lower oceanic crust—Atlantis Bank, SW Indian Ridge
The cooling history and therefore thermal structure of oceanic lithosphere in slow-spreading environments is, to date, poorly constrained. Application of thermochronometric techniques to rocks fromExpand
The rate of oceanic detachment faulting at Atlantis Bank, SW Indian Ridge
Abstract The rates of slip on oceanic detachment faults and how those rates compare to sea-floor spreading rates constitute fundamental data required to constrain how oceanic core-complexes form andExpand
Contrasting Cooling Rates in the Lower Oceanic Crust at Fast- and Slow-spreading Ridges Revealed by Geospeedometry
Two approaches to determining the high-temperature (� 10008 Ct o � 6008C) cooling rate of the lower oceanic crust and upper mantle are presented and critically evaluated.The first is based on theExpand
Ti-in-zircon thermometry: applications and limitations
The titanium concentrations of 484 zircons with U-Pb ages of ∼1 Ma to 4.4 Ga were measured by ion microprobe. Samples come from 45 different igneous rocks (365 zircons), as well as zircon megacrystsExpand
Corrugated slip surfaces formed at ridge–transform intersections on the Mid-Atlantic Ridge
The strips of ocean crust formed at the inside corners of both transform and non-transform offsets on the Mid-Atlantic Ridge are punctuated by topographic highs—the 'inside-corner highs'1–3—whereExpand