Evidence for Mesoarchean (∼3.2 Ga) rifting of the Pilbara Craton

The missing link in an early Precambrian Wilson cycle

Martin Van Kranendonk, R. Hugh Smithies, Arthur H. Hickman, Michael T.D. Wingate, Simon Bodorkos

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

A sequence of c. 3.2 Ga low-grade sedimentary rocks, bimodal volcanic rocks, and subvolcanic layered mafic-ultramafic sills and dykes occur in greenstone belts that flank the margins of the 3.51-3.24 Ga East Pilbara Terrane of the Pilbara Craton, Western Australia. U-Pb SHRIMP zircon data and Sm-Nd model age data suggest that these rocks represent juvenile addition of material to the margins of the craton during a period of major extension, accompanied by the local emplacement of granitic rocks. This extensional event is also represented in adjacent terranes, by thick basalt flows with c. 3.2 Ga zircon and Sm-Nd model ages, and by granitic rocks. Based on the available age data, geochemistry of basaltic rocks, and the distribution of this event in space and time within the craton, we interpret the c. 3.2 Ga rocks to reflect widespread rifting of the protocraton and associated thinning of the lithosphere. This event resulted in separation of the flanking Kurrana and Karratha Terranes from their parent East Pilbara Terrane, which represents the ancient nucleus of the craton. These terranes were then reassembled during subsequent accretion at 3.07-2.905 Ga. Combined, the data suggest the preservation of a Mesoarchean Wilson cycle in the Pilbara Craton. Crown

Original languageEnglish
Pages (from-to)145-161
Number of pages17
JournalPrecambrian Research
Volume177
Issue number1-2
DOIs
Publication statusPublished - Feb 1 2010
Externally publishedYes

Fingerprint

rifting
craton
terrane
Precambrian
Rocks
rock
zircon
Volcanic rocks
Sedimentary rocks
Geochemistry
greenstone belt
sill
thinning
sedimentary rock
lithosphere
volcanic rock
emplacement
basalt
geochemistry
accretion

Keywords

  • Archean
  • Pilbara Craton
  • Rifting
  • Wilson cycle

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology

Cite this

Evidence for Mesoarchean (∼3.2 Ga) rifting of the Pilbara Craton : The missing link in an early Precambrian Wilson cycle. / Van Kranendonk, Martin; Hugh Smithies, R.; Hickman, Arthur H.; Wingate, Michael T.D.; Bodorkos, Simon.

In: Precambrian Research, Vol. 177, No. 1-2, 01.02.2010, p. 145-161.

Research output: Contribution to journalArticle

Van Kranendonk, Martin ; Hugh Smithies, R. ; Hickman, Arthur H. ; Wingate, Michael T.D. ; Bodorkos, Simon. / Evidence for Mesoarchean (∼3.2 Ga) rifting of the Pilbara Craton : The missing link in an early Precambrian Wilson cycle. In: Precambrian Research. 2010 ; Vol. 177, No. 1-2. pp. 145-161.
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