Anti-continent accreted at the base of the mantle and recycled in mantle plumes

DOI

Bibliographic Information

Other Title
  • 反大陸の運命：マントル最下部への集積とそのリサイクル

Abstract

The continental crust (CC) with an intermediate composition has been created along volcanic arcs. Mantle-derived arc magmas are, however, generally basaltic. A consequence of CC formation thus should be the corresponding production of refractory residue, referred to as 'anti-continent (AC)'. AC is likely to detach from arc crust by density inversion and descend into the upper mantle. High-pressure experiments demonstrate that sinking AC is, in contrast to the subducting oceanic crust, always denser than the surrounding mantle, suggesting that AC founders headlong and accumulates at the base of the mantle to form a 250km-thick mass known as the D" layer. Geochemical modeling further suggests the contribution of the accreted AC to deep-seated hotspot sources (EM1). In complementary processes, Earth creates buoyant CC and dense AC at the top and the base of the mantle, respectively, and has recycled portions of AC in mantle plumes.

Journal

Keywords

Details 詳細情報について

  • CRID
    1390001205544602624
  • NII Article ID
    130004601492
  • DOI
    10.14824/jakoka.2010.0.1.0
  • Text Lang
    ja
  • Data Source
    • JaLC
    • CiNii Articles
  • Abstract License Flag
    Disallowed

Report a problem

Back to top