Structural expression of oblique seafloor spreading in the Macquarie Island ophiolite, Southern Ocean

Peter A. Rivizzigno, Jeffrey A. Karson

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The Macquarie Island ophiolite is an uplifted block of oceanic crust formed at the Australia-Pacific spreading center between 12 and 9 Ma. The sense of motion and geological processes across this plate boundary reflect an evolution from orthogonal spreading through progressively more oblique spreading to the present-day transpressional regime. The crust that makes up the island was formed during an interval of oblique spreading along east-trending spreading segments punctuated by a series of northwest-trending discontinuities. The discontinuities are accommodation zones marked by oblique-slip dextral-normal faults, localized dikes and lava flows, and extensive hydrothermal alteration, indicating that these zones were active near the spreading axis. These features provide a window into the internal structure of oceanic crust generated by oblique spreading.

Original languageEnglish (US)
Pages (from-to)125-128
Number of pages4
JournalGeology
Volume32
Issue number2
DOIs
StatePublished - Feb 1 2004
Externally publishedYes

Keywords

  • Discontinuities
  • Hydrothermal circulation
  • Oblique-slip faults
  • Seafloor spreading
  • Transfer zones

ASJC Scopus subject areas

  • Geology

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