Lower Carboniferous ramp sedimentation of the Central Alborz Basin, northern Iran: Integrated sedimentological and rock-magnetic studies

Sardar Abadi, Mehrdad; Da Silva, Anne-Christine; Mosaddegh, hossein; Spassov, simo; Boulvain, Frédéric

doi:10.1144/SP414.13

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Lower Carboniferous ramp sedimentation of the Central Alborz Basin, northern Iran: Integrated sedimentological and rock-magnetic studies

Sardar Abadi, Mehrdad; Da Silva, Anne-Christine; Mosaddegh, hossein et al.

2015 • In Da Silva, Anne-Christine; Whalen; Hladil et al. (Eds.) Magnetic Susceptibility Application: A Window onto Ancient Environments and Climatic Variations

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10.1144/SP414.13

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Keywords :

Lower Carboniferous; Mobarak Formation; Iran; rock magnetism; sedimentology

Abstract :

[en] The Lower Carboniferous Mobarak Formation in the Alborz Basin (northern Iran) was deposited along the northeastern margin of Gondwana in a carbonate ramp setting. This paper focuses on the Tournaisian stratigraphic interval of this formation that crops out at the Jaban section in the southwestern Central Alborz Basin. The following facies associations, representing different ramp palaeoenvironments, have been identified: (1) mudstone–wackestone outer-ramp facies; (2) crinoidal to skeletal grainstone–packstone mid-ramp facies; (3) peloidal to crinoidal grainstone–packstone inner-ramp facies; and (4) coastal facies, which include a variety of microbial laminated to oncoidal grainstones and mudstones with evaporitic pseudomorphs. This ramp profile was affected by frequent storms that were responsible for the formation of several skeletal to non-skeletal shoals in the distal mid-ramp to the most proximal inner-ramp areas. The development of the skeletal to non-skeletal shoals along the sea side of the ramp formed a semi-enclosed lagoon sensitive to the influence of both high tides and storm surges.The magnetic susceptibility (xin) of all the samples was measured and compared with that of the facies from which the sample was taken. There is a clear link between xin and the facies; the average xin values were higher for the distal facies than for the proximal facies. The xin profile of this Lower Carboniferous carbonate sequence reflects stratigraphic variations in response to relative changes in sea level and the input of detrital materials. In the context of the sequence stratigraphic framework, the average xin values for lowstand and transgressive systems tract deposits are higher than for the highstand systems tract deposits. The clear link between xin and facies indicates at least a partly preserved primary xin signal related to the detrital inputs. However, to obtain a better understanding of the nature and origin of the minerals carrying the xin, we performed hysteresis measurements on selected samples. It appears that the xin signal is mainly carried by lowcoercivity ferromagnetic minerals such as magnetite, with a mixture of relatively coarse grains (detrital fraction) and ultra-fine grains (probably formed during diagenesis).

Disciplines :

Earth sciences & physical geography

Author, co-author :

Sardar Abadi, Mehrdad ; Université de Liège - ULiège > Form. doct. sc. (géologie - Bologne)

Da Silva, Anne-Christine ; Université de Liège > Département de géologie > Pétrologie sédimentaire

Mosaddegh, hossein; University of Kharazmi > Geology > Sedimentary Geology > associate professor

Spassov, simo; Geophysical Center of Dourbes > Division Environmental Magnetism > PhD

Boulvain, Frédéric ; Université de Liège > Département de géologie > Pétrologie sédimentaire

Language :

English

Title :

Lower Carboniferous ramp sedimentation of the Central Alborz Basin, northern Iran: Integrated sedimentological and rock-magnetic studies

Publication date :

2015

Main work title :

Magnetic Susceptibility Application: A Window onto Ancient Environments and Climatic Variations

Author, co-author :

Da Silva, Anne-Christine ; Université de Liège - ULiège > Geology

Whalen

Hladil

Chadimova

Chen

Spassov

Boulvain, Frédéric ; Université de Liège - ULiège > Geology

Devleeschouwer

Publisher :

Lyell, United Kingdom

Collection name :

Geological Society, London, Special Publications, 414

Pages :

73-91

Peer reviewed :

Peer reviewed

Available on ORBi :

since 18 May 2015

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_pk_id	InnoCraft Ltd .uliege.be	1 year	Used to store a few details about the user such as the unique visitor ID
_pk_ses	InnoCraft Ltd .uliege.be	30 minutes	Short lived cookies used to temporarily store data for the visit
_pk_ref	InnoCraft Ltd .uliege.be	6 months	Used to store the attribution information, the referrer initially used to visit the website