混杂沉积岩

混杂沉积岩（英语：Diamictite）是一种沉积岩，由未淘选或低淘选度的陆源沉积物组成，其颗粒大小差距很大，从粘土到巨砾，基质为泥岩或砂岩。该地质名词由 Richard Foster Flint 和其他人创造的，作为一个纯粹的描述性名词，并没有提及任何该名词的起源^[1]。一些地质学家将这名词仅用于未分选或分选差的砾岩或角砾岩，它们中的砾石颗粒少，被为泥岩或砂岩基质包围。^[2] 。未岩石化的混杂沉积岩称为混杂沉积物（英语：diamicton）。冰川沉积物，例如冰碛石和泥砾，也是混杂沉积岩一种，因为它们的淘选度很低。混杂沉积岩经常被错误地解释为冰川作用造成的。但事实上，最常见的混杂沉积岩来源是在构造运动活动区，由海底泥流或垮塌造成的。

也有在其他地质作用造成的^[3]^[4]。例如：

冰川来源：冰碛，融出碛，冰筏物及掉落石
火山来源：火山泥流
海洋来源：土石流，浊积岩，混杂堆积
构造起源：断层泥
侵蚀起源：风化层的泥石流

参考文献

^ Flint, R.F., J.E. Sanders, and J. Rodgers (1960) Diamictite, a substitute term for symmictite Geological Society of America Bulletin. 71(12):1809–1810.
^ Tucker, M.E. (2003) Sedimentary Rocks in the Field John Wiley & Sons, Ltd., New York, New York. 244 pp. ISBN 978-0-470-85123-4
^ Eyles, N.; Januszczak, N. (2004). "’Zipper-rift’: A tectonic model for Neoproterozoic glaciations during the breakup of Rodinia after 750 Ma". Earth-Science Reviews 65 (1-2): 1-73. (pdf 4 Mb) 互联网档案馆的存档，存档日期2007-11-28.
^ Huber, H., Koeberl, C., McDonald, I., Reimold, W.U.: Geochemistry and petrology of Witwatersrand and Dwyka diamictites from South Africa: Search for an extraterrestrial component. Geochimica et Cosmochimica Acta, Vol. 65, No. 12, pp. 2007–2016, 2001. (pdf 470 Kb)

[FlintOthers1960a-1] Flint, R.F., J.E. Sanders, and J. Rodgers (1960) Diamictite, a substitute term for symmictite Geological Society of America Bulletin. 71(12):1809–1810.

[Tucker2003a-2] Tucker, M.E. (2003) Sedimentary Rocks in the Field John Wiley & Sons, Ltd., New York, New York. 244 pp. ISBN 978-0-470-85123-4

[eyles_2004-3] Eyles, N.; Januszczak, N. (2004). "’Zipper-rift’: A tectonic model for Neoproterozoic glaciations during the breakup of Rodinia after 750 Ma". Earth-Science Reviews 65 (1-2): 1-73. (pdf 4 Mb) 互联网档案馆的存档，存档日期2007-11-28.

[4] Huber, H., Koeberl, C., McDonald, I., Reimold, W.U.: Geochemistry and petrology of Witwatersrand and Dwyka diamictites from South Africa: Search for an extraterrestrial component. Geochimica et Cosmochimica Acta, Vol. 65, No. 12, pp. 2007–2016, 2001. (pdf 470 Kb)

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