Aliran gravitasi sedimen

Batupasir turbidit di Jerman.

Sebuah aliran gravitasi sedimen (sediment gravity flow) adalah salah satu dari beberapa tipe mekanisme transportasi sedimen, yang dibagi lagi oleh ahli geologi menjadi empat proses dasar. Aliran-aliran ini dibedakan oleh sedimen dominan yang mendukung mekanisme tersebut, [1][2] yang akan sangat sulit untuk dibedakan karena aliran gravitasi bisa jadi berwujud transisi dari satu jenis ke jenis yang lain sepanjang evolusinya.[3]

Sedimen pendukung mekanisme

Aliran gravitasi sedimen diwakili oleh empat mekanisme berbeda yang menjaga butir-butir agar tetap dalam bentuk aliran suspensi.

  • Aliran butir (grain flow)[4]
  • Aliran fluida (liquefied / fluidized flow)[5]
  • Aliran debris (debris flow / mudflow )[6]
  • Arus turbidit (turbidity current)[6]

Referensi

  1. ^ Middleton, G.V. and Hampton, M.A. (1973). "Sediment gravity flows: mechanics of flow and deposition". Turbidites and deep-water sedimentation. Pacific Section of the Society of Economic Paleontologists and Mineralogists. Short Course Lecture Notes, p. 1–38.
  2. ^ Postma, G. (1986). "Classification for sediment gravity-flow deposits based on flow conditions during sedimentation" (PDF). Geology(Geological Society of America) 14: 291–294. doi:10.1130/0091-7613(1986)14<291:cfsgdb>2.0.co;2. Retrieved 6 December 2011.
  3. ^ Visher, G.S. (1999). Stratigraphic systems: origin and application 1. Academic Press. 521. ISBN 978-0-12-722360-5. Retrieved 28 December2011.
  4. ^ Lowe, D.R. (1982). "Sediment gravity flows: II. Depositional models with special reference to the deposits of high-density turbidity currents". Journal of Sedimentology (Society of Economic Paleonotlogists and Mineralogists) 52: 279–297.
  5. ^ Lowe, D.R. (2006). "Subaqueous liquefied and fluidized sediment flows and their deposits". Sedimentology 23: 285–308.
  6. ^ a b Gani, M.R. (2004).

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