Magmatism and rift margin evolution: Evidence from northwest Australia

John R. Hopper, John C. Mutter, Roger L. Larson, Carolyn Z. Mutter

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

74 Citationer (Scopus)

Abstrakt

Deep crustal seismic observations from northwest Australia demonstrate that the Cuvier margin is a volcanic passive margin that formed as Greater India rifted away from Australia in the Early Cretaceous. Formation of the Cuvier Basin and initial sea-floor spreading resulted in the emplacement of exceptionally thick oceanic crust, while contemporaneous spreading off the adjacent Exmouth Plateau formed normal-thickness oceanic crust. Rapid rifting of the Cuvier margin created strong lateral temperature gradients in the subjacent upper mantle at the time of breakup. This induced small-scale convection in the upper mantle that increased the rate of upwelling and, thus, the volume of melt generated by decompression partial melting. In turn, this resulted in a larger volume of magma at the initiation of sea-floor spreading, and thicker oceanic crust was initially emplaced. -from Authors

OriginalsprogEngelsk
Sider (fra-til)853-857
Antal sider5
TidsskriftGeology
Vol/bind20
Udgave nummer9
DOI
StatusUdgivet - sep. 1992
Udgivet eksterntJa

Programområde

  • Programområde 3: Energiressourcer

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