Salinity changes during Late Oligocene to Early Miocene Asmari Formation deposition, Zagros Mountains, Iran

Mossadegh, Zahra Karimi; Haig, David W.; Allan, Tony; Adabi, Mohammad Hossein; Sadeghi, Abbas

doi:10.1016/j.palaeo.2008.10.021

Cited by 66 publications

(31 citation statements)

References 29 publications

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“…13 a- The Quinqueloculina assemblage samples all plot amongst Murray's (1965) samples (Fig. 16a) and are similar to lagoonal assemblages from other sub-tropical to tropical Indo-PaciWc marginal seas with normal to elevated salinities (Shark Bay: Mossadegh et al 2009;Exmouth Gulf: Orpin et al 1999;Red Sea: Haunold et al 1998). In marginal seas with freshwater inXux and cooler water temperatures (e.g., Gulf of Thailand: Melis and Violanti 2006;Gulf of Tonkin: Waller 1960;Bohai Sea: Zheng 1990) such assemblages are rare.…”

Section: Smaller Hyaline Foraminiferamentioning

confidence: 63%

“…In the Caribbean realm, Walker et al (2011) found Placopsilina most common at 33 m water depth oV of the Bahamas, and Javaux and Scott (2003) found it associated with turbulent outer-reef habitats of Bermuda. A normal marine salinity is interpreted for this assemblage from the higher abundance of agglutinated foraminifera, and low number of porcelaneous taxa (Mossadegh et al 2009). The presence of the deeper-water taxa Hyalinea balthica (>40 m: Lutze 1974) and Hanzawia spp.…”

Section: Agglutinated Foraminiferamentioning

confidence: 94%

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Biodiversity and community structure of Late Pleistocene foraminifera from Kish Island, Persian Gulf (Iran)

Mossadegh

Parker

Gischler

2012

Facies

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The raised coral reef sequences at Kish Island provide a rare window into the depositional setting and paleoenvironment of a high-latitude, shallow-water coral reef that developed under turbid conditions in the Persian Gulf during Marine Isotope Stage 7 (»200 to 250 ka). Six sedimentary facies and eight foraminiferal assemblages can be identiWed throughout the sequence. A ninth assemblage can be deWned for the modern subtidal realm. At the base of the sequence is a marl rich in hyaline foraminifera (Elphidium, Ammonia, Asterorotalia, Bulimina, Nonion, and Quinqueloculina) and ostracods, which was deposited in about 30-40 m water depth in a turbid deltaic setting. Shallowing resulted in the marl becoming sandy, and changing to a mollusc-rich facies with rare foraminifera (mostly smaller miliolid taxa) that formed the substrate for coral recruitment. The coral marl layer contains many large corals embedded in situ in an aggregate and coralline algae-rich marl. Two abundance peaks in the foraminifera occur at the base and mid-way through this layer, which also correspond to a change from Murrayinella-dominated to Placopsilina-dominated assemblages, indicating deepening and more open-marine conditions, but elevated turbidity. Towards the top of the layer, abundance of foraminifera decreases and miliolid foraminifera become dominant. The top-most layer is dominated by coral and mollusc fragments and has an Amphistegina-rich reef-related assemblage. Of the Late Pleistocene foraminiferal assemblages, the Murrayinella-, Pararotalia-, and Placopsilina-dominated assemblages are no longer present in the modern gulf for unknown reasons. Of the other Wve assemblages, only the Amphistegina assemblage is found within proximity to the modern Kish Island. The Elphidium and Asterorotalia-Bulimina assemblages are from deeper areas of the gulf. The Ammonia and Quinqueloculina assemblages occur in lagoonal sediments on the Arabian side of the gulf. Like the modern Persian Gulf, the diversity of foraminifera was low (»80 common species) during the Pleistocene and does not correlate with foraminiferal abundance.

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Section: Smaller Hyaline Foraminiferamentioning

confidence: 63%

Section: Agglutinated Foraminiferamentioning

confidence: 94%

Biodiversity and community structure of Late Pleistocene foraminifera from Kish Island, Persian Gulf (Iran)

Mossadegh

Parker

Gischler

2012

Facies

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“…This association, together with the presence of the red algae debris characterizes an inner-shelf depositional setting (Corda and Brandano, 2003). In facies 8, the skeletal components and the grainstone textural rock type are interpreted as results of a high-energy environment with high salinity water (40 psu salinity range) (Mossadegh et al, 2009). Additionally, the presence of sparry calcite cement is also indicative of a high-energy environment.…”

Section: Discussionmentioning

confidence: 96%

Facies analysis and sequence stratigraphy of the Asmari Formation in the northern area of Dezful Embayment, south-west Iran

Zoeram¹,

Vahidinia²,

Mahboubi³

et al. 2013

Studia UBB Geologia

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Abstract. This paper deals with the sequence stratigraphy of the Oligocene (Rupelian-Chattian)-Early Miocene (Burdigalian) Asmari Formation based on microfacies analysis of the sediments in the Ghale Nar Oilfield, central area of Zagros fold-thrust belt. Fourteen facies types typical for upward shallowing trend from open marine (MF 1-3), to shoal (MF 4-5), semi-restricted and restricted lagoon , and finally to near-shore lagoon (MF 13-14) depositional environments were identified. Based on the environmental interpretations, we reconstructed a homoclinal ramp mainly represented by its inner and middle sectors. Facies types MF 4-14 are characterized by the occurrence of large and small porcelaneous benthic foraminifera representing a shallow-water setting of an inner ramp influenced by wave-and tide-related processes. MF1 (Pabdeh Formation), and 2-3 with planktonic, large and small hyaline benthic foraminifera represent between fair weather wave base (FWWB) and storm wave base (SWB). Four third-order depositional sequences were recognized. In order to better correlate the identified sequences with those pre-defined of the Asmari Formation in the Dezful Embayment and the Izeh zone that are chronologically well-known, we use their number instead of their name. Sequence 2 mainly consists of an open marine environment in the base, followed by semi-restricted to restricted lagoonal facies. Sequences 36 are characterized by semi-restricted to restricted lagoonal facies. Moreover, the regional relative sea-level change curves correlate well with the global sea-level change curves.

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“…Ehrenberg et al (2007) and Laursen et al (2009) examined the Asmari Formation based on Sr isotope stratigraphy and revised age ranges mostly for the lower and middle parts of the Asmari Formation. Moreover, salinity changes during the Late Oligocene to Early Miocene for deposition of the Asmari Formation have been described by Mossadegh et al (2009).…”

Section: Previous Workmentioning

confidence: 99%

The Asmari Formation, north of the Gachsaran (Dill anticline), southwest Iran: facies analysis, depositional environments and sequence stratigraphy

Dill

Seyrafian

Vaziri‐Moghaddam

2010

Carbonates Evaporites

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The Asmari Formation is exposed at the Dill anticline in the Dezful Embayment of the Zagros foreland basin with 206 m thickness comprising thin, medium and thick to massive bedded carbonates. The Asmari Formation is Late Oligocene (Chattian)-Early Miocene (Burdigalian) in age at the study area. Ten facies characterizing upward gradual shallowing trend of an open marine (MF 1-3), shoal (MF 4), semi-restricted and restricted lagoon (MF 5-9) and near-shore lagoon (MF 10) depositional environments were identified. Based on environmental interpretations, a homoclinal ramp consisting of inner and middle parts prevails. MF 4-10 were characterized by the occurrence of large and small porcelaneous benthic foraminifera representing a shallow-water setting of an inner ramp influenced by wave and tide processes. MF 1-MF 3 with large and small hyaline benthic foraminifera represent a deeper fair water wave base of a middle ramp setting. Three-third-order depositional sequences were recognized. Sequence 1 mostly consists of an open marine to the lower part and is followed by semi to restricted lagoon facies. Sequences 2 and 3 are characterized by semi to restricted lagoon facies. Moreover, the relative sea-level change curves correlate with the global sea-level change curves.

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Salinity changes during Late Oligocene to Early Miocene Asmari Formation deposition, Zagros Mountains, Iran

Cited by 66 publications

References 29 publications

Biodiversity and community structure of Late Pleistocene foraminifera from Kish Island, Persian Gulf (Iran)

Biodiversity and community structure of Late Pleistocene foraminifera from Kish Island, Persian Gulf (Iran)

Facies analysis and sequence stratigraphy of the Asmari Formation in the northern area of Dezful Embayment, south-west Iran

The Asmari Formation, north of the Gachsaran (Dill anticline), southwest Iran: facies analysis, depositional environments and sequence stratigraphy

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