Provenance of sandstones from the Lower Cretaceous Sasayama Group, Inner Zone of Southwest Japan

D. K. Asiedu, Shigeyuki Suzuki, T. Shibata

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Abstract

Modal analysis and phase chemistry of sandstones of the Lower Cretaceous Sasayama Group, Southwest Japan, indicate that the detritus were derived from heterogeneous sources that include medium- to high-grade metamorphic, mafic-ultramafic, and acidic magmatic rocks. Garnet geochemistry suggests their derivation from epidote-amphibolite to granulite facies metamorphic rocks. Sphene and chlorite geochemistry suggests their derivation from mafic rocks. Chemical compositions of chromian spinel indicate input from Alpine-type peridotite. The chemistry of the chromian spinel further suggests that the Alpine-type peridotite source was most probably formed under an oceanic back-arc basin setting rather than mid-oceanic ridge setting. Chemical compositions of chromian magnetite indicate that the Alpine-type peridotite provenance was subjected to metamorphism of up to the lower amphibolite facies prior to erosion and transport. The metamorphic and granitic rocks of the Hida-Oki Terrane, ophiolitic rocks of the Sangun-Renge Terrane, and rhyolitic rocks from uncertain terrane (Akiyoshi?) are most probably the major source of detritus to the Sasayama basin. The basin is most likely a strike-slip basin that formed along the eastern margin of the Asian continent. (C) 2000 Elsevier Science B.V. All rights reserved.

Original languageEnglish
Pages (from-to)9-24
Number of pages16
JournalSedimentary Geology
Volume131
Issue number1-2
DOIs
Publication statusPublished - Mar 1 2000

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Keywords

  • Heavy minerals
  • Japan
  • Mineral chemistry
  • Modal analysis
  • Provenance

ASJC Scopus subject areas

  • Geology
  • Stratigraphy

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