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TitleUpper Triassic-Jurassic foreland sequences of the Ordos Basin in China
AuthorSitian, L; Shigong, Y; Jerzykiewicz, T
SourceStratigraphic evolution of foreland basins; by Dorobek, S L (ed.); Ross, G M (ed.); SEPM (Society for Sedimentary Geology), Special Publication no. 52, 1995 p. 233-241,
Alt SeriesGeological Survey of Canada, Contribution Series 37192
PublisherSEPM (Society for Sedimentary Geology)
Mediapaper; on-line; digital
File formatpdf
AreaOrdos Basin; China
Subjectsfossil fuels; general geology; hydrocarbon potential; hydrocarbons; basins; sedimentary basins; unconformities; stratigraphic analyses; foredeeps; deposition; depositional history; Jurassic; Mesozoic; Cretaceous
AbstractThe Ordos basin is one of the most important coal and hydrocarbon bearing sedimentary basins in China The sedimentary
cover which overlies crystalline basement is subdivided into seven unconformity bounded stratigraphic sequences The Upper Triassic
to Upper Jurassic sequences are interpreted to be of foreland basin deposits Development of a rapidly subsiding foredeep adjacent to
the rising western and southern flanks of the Ordos basin commenced in late Triassic time during the late phases of the Indosinian
Orogeny A lake which developed in the axial part of the foredeep was a site of sedimentation of organic rich mudstones which are
the major hydrocarbon source in the basin The main late Triassic phase of foreland deposition is represented by over 3 000 m of
proximal coarse grained sediments interfingering with the lacustrine facies Lacustrine fan deltas and steep sloped deltas were the main
sites of foreland deposition The depositional history of the Ordos foreland basin includes an overfilled phase in early Jurassic time
and changes of source area in late Jurassic time Unlike the Mesozoic retroarc basins of North America which developed under a
generally unidirectional west east compressional regime the Ordos foreland basin was developed under the influence of transpression
related to collision in the Tethys tectonic domain of southwest China and the collision of North China and Yangtze blocks
Foreland sedimentation was terminated in early Cretaceous time due to a continent wide shift to an extensional tectonic regime.

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