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Implications of a Bengal Fan-type deposit in the Paleozoic Lachlan Fold Belt of southeastern Australia

Journal Article


Abstract


  • Ordovician rocks of the Lachlan fold belt contain a continental-margin submarine fan that in its undeformed state has a minimum area of 1.2 �� 10 6 km 2 , comparable to the size of the Bengal Fan. Cambrian and Ordovician mafic volcanic seamount chains in the Lachlan fold belt are analogous to the Ninetyeast Ridge. Basement of the Lachlan fold belt, by analogy with that of the Bengal Fan, may have been ocean floor with an overlying continental-rise prism that developed after the breakup of Laurentia and eastern Gondwana to form the ancestral Pacific Ocean in the latest Precambrian. The continental-rise prism was imbricated during Silurian-Devonian deformation to form the lower crust that provided source rocks for the Silurian to Carboniferous granites. -from Authors

Publication Date


  • 1992

Scopus Eid


  • 2-s2.0-84879889196

Start Page


  • 1047

End Page


  • 1049

Volume


  • 20

Issue


  • 11

Place Of Publication


Abstract


  • Ordovician rocks of the Lachlan fold belt contain a continental-margin submarine fan that in its undeformed state has a minimum area of 1.2 �� 10 6 km 2 , comparable to the size of the Bengal Fan. Cambrian and Ordovician mafic volcanic seamount chains in the Lachlan fold belt are analogous to the Ninetyeast Ridge. Basement of the Lachlan fold belt, by analogy with that of the Bengal Fan, may have been ocean floor with an overlying continental-rise prism that developed after the breakup of Laurentia and eastern Gondwana to form the ancestral Pacific Ocean in the latest Precambrian. The continental-rise prism was imbricated during Silurian-Devonian deformation to form the lower crust that provided source rocks for the Silurian to Carboniferous granites. -from Authors

Publication Date


  • 1992

Scopus Eid


  • 2-s2.0-84879889196

Start Page


  • 1047

End Page


  • 1049

Volume


  • 20

Issue


  • 11

Place Of Publication