Sedimentary Geology, ( ISI ), Volume (198), No (1), Year (2007-1) , Pages (53-74)

Title : ( Jurassic deep-water fans in the Neo-Tethys Ocean: The Kashafrud Formation of the Kopet-Dagh Basin, Iran )

Authors: Mehdi Reza Poursoltani , Sayyed Reza Moussavi Harami , Martin R. Gibling ,

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Abstract

The Middle Jurassic Kashafrud Formation of northeast Iran was deposited in the Kopet-Dagh Basin, linked to the Neo-Tethys Ocean. The 2 km thick succession commences with fluvio-marine boulder conglomerates that occupy bedrock valleys, but the bulk of the formation comprises a deep-water succession of interbedded sandstone and mudstone packages with trace fossils and sparse ammonites. Neogene collisional events deformed the strata to create the Kopet-Dagh mountains. The deep-water succession represents channel-lobe systems and associated levees and overbank areas on slope to basin-floor fans. Northward paleoflow suggests that rivers drained uplands along the Paleo-Tethys Suture zone, forming fan deltas on a narrow shelf, with associated sediment transport to deeper water. Coarse sands, extrabasinal pebbles, and plant fragments are present throughout the formation, and a thick boulder conglomerate unit lies within the turbidite succession. These observations suggest proximity to terrestrial sources throughout deposition. Sandstone packages are mainly less than 10 m thick (maximum 84 m), and numerous lensoid packages of thick-bedded sandstone tens of meters thick and up to 200 m wide represent submarine channel fills. Thick-bedded lenses and sheets show a relatively narrow range of paleoflow direction and represent major submarine conduits, whereas the more varied paleoflow direction of thin-bedded packages suggests that many were deposited on levees. The presence in the Kashafrud Formation of potential source rocks in the form of organic-rich mudstones and abundant plant fragments suggests that the formation may have contributed to hydrocarbon fields within overlying formations. Sandstone sheets and channel fills could form local reservoirs.

Keywords

, Turbidites, Deep-sea fans; Submarine channels; Trace fossils; Iran; Jurassic; Neo-Tethys Ocean
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@article{paperid:1018116,
author = {Mehdi Reza Poursoltani and Moussavi Harami, Sayyed Reza and Martin R. Gibling},
title = {Jurassic deep-water fans in the Neo-Tethys Ocean: The Kashafrud Formation of the Kopet-Dagh Basin, Iran},
journal = {Sedimentary Geology},
year = {2007},
volume = {198},
number = {1},
month = {January},
issn = {0037-0738},
pages = {53--74},
numpages = {21},
keywords = {Turbidites; Deep-sea fans; Submarine channels; Trace fossils; Iran; Jurassic; Neo-Tethys Ocean},
}

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%0 Journal Article
%T Jurassic deep-water fans in the Neo-Tethys Ocean: The Kashafrud Formation of the Kopet-Dagh Basin, Iran
%A Mehdi Reza Poursoltani
%A Moussavi Harami, Sayyed Reza
%A Martin R. Gibling
%J Sedimentary Geology
%@ 0037-0738
%D 2007

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