Microfacies and depositional environment of the Upper Asmari Formation (Burdigalian), North-Central Zagros Basin, Iran

Seyrafian, Ali; Hamedani, Ali

doi:10.1127/njgpa/210/1998/129

Cited by 27 publications

(20 citation statements)

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“…Sequences comparable to those of the Esfahan-Sirjan Basin are described from the Asmari Formation in the Iranian Zagros Basin (Seyrafian and Hamedani 1998;Vaziri-Moghaddam et al 2006), which is part of the African/Arabian Plate. Sedimentation took place on a ramp-type carbonate platform (Vaziri-Moghaddam et al 2006) and depositional environments include tidal flat, shelf lagoon, platform margin and open marine environments.…”

Section: Implications For the Paleogeographic And Paleobiogeographic mentioning

confidence: 95%

The Oligo-/Miocene Qom Formation (Iran): evidence for an early Burdigalian restriction of the Tethyan Seaway and closure of its Iranian gateways

Reuter

Piller

Harzhauser

et al. 2007

Int J Earth Sci (Geol Rundsch)

214

168

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In the central Iranian Esfahan-Sirjan and Qom basins sedimentation of the Oligo-/Miocene Qom Formation took place on extensive mixed carbonate-siliciclastic ramps. During this time, both basins were positioned at the Eurasian margin of the Tethyan Seaway, which connected the western and eastern regions of the Tethys Ocean at least until the late Burdigalian. During the so-called Terminal Tethyan Event the Tethyan Seaway was then closed due to the collision of the African/Arabian and Iranian/Eurasian plates. Facies analysis of the sedimentary record of both basins indicates paleoenvironments ranging from terrestrial to open marine settings, including mangrove, restricted inner shelf lagoon, seagrass meadow, reefal, and deeper offshore environments. Recognition of eight depositional sequences and elaboration of an integrated biostratigraphic framework (calcareous nannoplankton, planktic and larger benthic foraminifers, gastropods, and pectinids) allow us to construct a basin-spanning stratigraphy. The assignment of the recognized sea-level lowstands to the Ru 3 to Bur 3 lowstands of the global sea-level curve enables a comparison with time-equivalent sections from the Zagros Basin, which was part of the African/Arabian Plate on the opposing southern margin of the Tethyan Seaway. The so calibrated sections display restrictions of the Tethyan Seaway and interruption of the south Iranian gateways between the Qom Basin and the Proto-Indopacific in relation to ongoing plate collision during the early Burdigalian.

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Section: Implications For the Paleogeographic And Paleobiogeographic mentioning

confidence: 95%

The Oligo-/Miocene Qom Formation (Iran): evidence for an early Burdigalian restriction of the Tethyan Seaway and closure of its Iranian gateways

Reuter

Piller

Harzhauser

et al. 2007

Int J Earth Sci (Geol Rundsch)

214

168

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“…Later, it was studied and was found to be Oligocene in age (Richardson 1924; Van Boeckh, Lees andRichardson 1933, andThomas 1948). The Asmari Formation was finally defined and its biostratigraphic criteria were stablished (Wynd 1965;lames andWynd 1965 andAdams andBourgeois 1967 Seyrafian, et al (1996), Seyrafian (1998), Seyrafian andHamedani (1998 and2003) and Moghaddam, et al, (2002).…”

Section: Introductionmentioning

confidence: 99%

Biostratigraphy of the Late Paleogene-Early Neogene succession, north-central border of Persian Gulf, Iran

Seyrafian

Mojikhalifeh

2005

Carbonates Evaporites

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The Late Paleogene-Early Neogene succession studied at the Khunnug area, on the northern flank of the Persian Gulf, includes upper part of the Jahrum, lower and middle parts of the Asmari and the most lowest part of the Gachsaran Formations, The upper part of the Jahrum Formation is characterized by limestones from the Dictyoconus-Coskinolina-Orbitolites and Globorotalia renzi-Globigerina assemblage zones of the Middle Eocene. The lower part of the Asmari Formation is gypsiferous marly, dolomitic limestones, and limestones from the Nummulites-Operculina assemblage zone of the Middle Oligocene (Rupelian) age. The middle part ofthe Asmari Formation is gypsiferous dolomitic limestone and limestone from the Archaias-Peneroplis assemblage zone of Early Miocene (Aquitanian) age. The lower part of the Gachsaran Formation is characterized by thick-bedded anhydrite and thin beds of dolomitic marls, with miliolids, reflects deposition during to Late Aquitanian through Burdigalian.Within the above succession, two conformable non-conformities correlatable to Priaborian-Lattorfian and Chattian times is recognized. Also, unlike most of the Zagros Basin, marine carbonate deposition (correlatable to the upper parts of the Asmari Formation) is replaced by the evaporitic facies of the Gachsaran Formation during that accumulated the Burdigalian time.

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“…Fragments of echinids, bryozoa, (Seyrafian et al 1996). 4-Southwest of Rig mountain (Seyrafian and Hamedani 1998). 5-Northwest ofDehdez (this study).…”

Section: "mentioning

confidence: 99%

“…This correlationis based on the following locations: Sorkh mountain at northwest of Semirom (Daryabndeh 1998), Burujen and Lordegan (Seyrafian et al 1996), south trent of Lagi anticline at southwest of Rig mountain (Seyrafian and Hamedani 1998), and in this study; southeastern flank of Lapeh anticlineat northwest of Dehdez area. The explanation is mostly concentrated on the upper Asmari Formation, since, these are the only well exposed rocks in most mentioned locations (FigA).…”

Section: Microfacies Correlation Of the Asmari Formation Across Centrmentioning

confidence: 99%

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Microfacies and depositional environments of the Asmari Formation, at Dehdez area (a correlation across central Zagros basin)

Seyrafian

2000

Carbonates Evaporites

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ThepredorninantmicrofaciesoftheAsmariFormationat Dehdezareaare: (1) globigerinidbioclasticwackestonetopackstone, (2) globigerinid laminated wackestone, (3) coral and coralline algal boundstone, (4) bioclastic-lithoclastic wackestone to packstone, (5) foraminifera bioclasticwackestone to packstone,(6) foraminiferagrainstone, (7) peloid wackestoneto packstone, and (8) peloid bioclastic grainstone.Based on microfacialcharacteristicsthe AsmariFormationwas depositedat the study area as a transgressive sequence from base to top from shoal to restrictedand normal marine shelf to fore-slope to basin margin deposits. Deposition continuedwith a regressive cycle from basin margin to fore-slopeand restricted shoal and finally to restrictedplatformsediments.Microfaciesanalysisand faciesinterpretations acrossthecentralhighZagrossuggeststhattheAsmariFormationwasdepositedmostlyinavery shallowmarine environmentat the easternmarginofthe basin. Depositionof a thick sequenceofpelagic sedimentsindicatesdeeper marine conditionsexistedat the centralparts of thebasinduringBurdigalian. Westward, the exposedAsmariFormationreflectsan occurrenceof very shallow marine condition prevailed during Oligo-Miocene. Finally deposition of the Asmari Formation took place under transition environmentat farwest of central Zagros Basin.

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Microfacies and depositional environment of the Upper Asmari Formation (Burdigalian), North-Central Zagros Basin, Iran

Cited by 27 publications

References 0 publications

The Oligo-/Miocene Qom Formation (Iran): evidence for an early Burdigalian restriction of the Tethyan Seaway and closure of its Iranian gateways

The Oligo-/Miocene Qom Formation (Iran): evidence for an early Burdigalian restriction of the Tethyan Seaway and closure of its Iranian gateways

Biostratigraphy of the Late Paleogene-Early Neogene succession, north-central border of Persian Gulf, Iran

Microfacies and depositional environments of the Asmari Formation, at Dehdez area (a correlation across central Zagros basin)

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