Variations of the trace fossil Zoophycos with respect to paleoenvironment and sequence stratigraphy in the Mississippian Mobarak Formation, northern Iran

Bayet‐Goll, Aram; Daraei, Mehdi; Taher, Seyede Parvin Mousavi; Etemad‐Saeed, Najmeh; Carvalho, Carlos Neto de; Zandkarimi, Keyvan; Monaco, Paolo; Zohdi, Afshin; Rabbani, Javad; Nasiri, Yaghub

doi:10.1016/j.palaeo.2020.109754

Cited by 16 publications

(19 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the contrary, in F1c, F2a, and F3a, an overall increase in Bositra shells (still less than in the middle shelf and slope) is attributed to a nearly more stable condition with higher nutrient levels and the prevalence of higher oxygen levels (dysaerobic). The predominant occurrence of Bositra and trace‐fossils in these facies, the latter dominated by forms tolerant of low oxygen levels ( Chondrites , pyritized burrows, Bositra shells), supports this idea (Bayet‐Goll et al, 2017, 2020; Sharafi et al, 2021; Sharafi, Ashuri, Mahboubi, & Moussavi‐Harami, 2012). Individual, thin‐bedded, graded laminae within the low‐energy facies (F1b–F1c or F2a–F2b) reflect suspension deposition from either single storm events, distal turbidity currents, or hybrid sediment gravity flows.…”

Section: Discussionmentioning

confidence: 85%

Palaeogeographic reconstruction and sequence architecture of the middle‐upper Jurassic successions of Hawraman Basin (NW Iran): Implications for tectono‐depositional processes of the northeastern passive margin of the Arabian Plate

2022

Self Cite

View full text Add to dashboard Cite

The middle‐upper Jurassic successions (Sargelu, Najmah, and Gotnia formations) of the NW sector of the Zagros Mountain belt are studied to generate a sequence stratigraphic model that helps to understand the Jurassic tectono‐depositional processes and palaeogeographic reconstructions of the northeastern passive margin of the Arabian Plate. The major geological structures observed in northwestern Iran indicate the predominance of an extensional deformation during the Toarcian to Aalenian owing to the eastern Mediterranean rifting. This extensional regime reached its maximum from the Early to Middle Jurassic, causing the fragmentation/drowning of the long‐lived Triassic to Early Jurassic carbonate platform and the development of the Hawraman intrashelf basin (HIB). Associated changes in marine current dynamics, trophic conditions, and degree of substrate oxygenation led to the bloom of oligotypical biota (Bositra limestones) creating unfavourable conditions for the development of other benthic communities (Sargelu Formation). Later, from the Callovian to Oxfordian, changes in carbonate production types (switch from the Bositra filament facies to the stromatolitic‐thrombolitic boundstones) remarkably decreased the dip angle of the depositional profile (Najmah Formation). A second‐order tectono‐eustatic cycle (a major long‐term transgressive/regressive [T/R] cycle) including six minor short‐term T/R facies cycles (TR1–TR6) is identified in the study area. The development of the T/R facies cycles during the Middle Jurassic (TR1–TR3; give‐up sequences; Sargelu Formation) as a result of combined global eustatic transgression and linear subsidence resulted in drowning and backstepping of the platform. In contrast, the short‐term cycles that developed in the upper Jurassic (TR4–TR6; keep‐up sequences; Najmah and Gotnia formations), following a sea‐level fall, resulted in progressive shallowing of the carbonate platform. This study suggests that extensional deformation of the area reached its peak in the transition of the Early to Middle Jurassic, leading to the creation of HIB, but either decreased or played a subordinate role to eustatic sea‐level variations during the deposition of the TR1–TR3 facies cycles (Bajocian‐Callovian). Changes in tectonic regime from an extensional deformation (Early Jurassic) to cooling subsidence (Middle Jurassic), accompanied by a long‐term transgressive sea‐level trend during the Middle Jurassic, were important factors in the development of anoxic trough environments with the deposition of organic‐rich intervals, represented by the TR1–TR3 facies cycles. Tectonic instability (tectonic uplift plus considerable differential subsidence due to the reactivation of faults) in the eastern margin of the Arabian platform during the Late Jurassic led to the development of the TR4–TR6 facies cycles.

show abstract

Section: Discussionmentioning

confidence: 85%

Palaeogeographic reconstruction and sequence architecture of the middle‐upper Jurassic successions of Hawraman Basin (NW Iran): Implications for tectono‐depositional processes of the northeastern passive margin of the Arabian Plate

2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…2007; Bayet‐Goll et al . 2018b, 2020), trace fossils of the Shirgesht Fm. can be subdivided into: (1) pre‐omission suite produced before the sedimentation break, for example arthropod burrows and trackways; (2) omission suite representing the activity of the Trichophycus producer on the firmground; and (3) post‐omission suite containing vertical burrows of suspension feeders, such as Arenicolites or Skolithos .…”

Section: Discussionmentioning

confidence: 99%

CrowdedTrichophycusichnofabrics in the early Ordovician successions of central Iran: insight into the Ordovician radiation

Bayet‐Goll

Uchman

Daraei

et al. 2021

LET

Self Cite

View full text Add to dashboard Cite

The Tremadocian‐to‐Floian siliciclastic deposits of the Shirgesht Formation in the Kalmard Block of central Iran show abundant occurrences of the mid‐tier Trichophycus venosus, a common ichnotaxon in the archetypical Cruziana ichnofacies. This trace fossil records a considerable increase in exploitation of offshore infaunal ecospace in comparison with older formations. Here, Trichophycus is relatively long and wide, with numerous and deep successively stacked causative burrows, which form dense burrow systems building the Crowded Trichophycus ichnofabric (CTI). Such development of CTI and the increase in depth of bioturbation had a negative effect on preservation of shallow‐tier traces, for example arthropod burrows and trackways. This resulted in decreasing abundance of trilobite‐produced trace fossils towards the top of the succession. The palaeobiological and palaeoecological interpretation of CTI points to stable habitats in muddy substrates above the storm wave base with high content of food and oxygen in pore waters, low‐energy hydrodynamic regimes and a long colonization window. Moreover, the architecture and the morphological features of Trichophycus suggest a combined dwelling‐feeding activity of the resident fair‐weather producer showing the K‐selected/climax strategy. The ethology of the producer, palaeoecological interpretations and taphonomic signatures revealed that it preferred dewatered, compacted muddy substrates (firmgrounds) in offshore settings, which might be related to minor hiatuses or short‐lived discontinuities. Although the appearance of Trichophycus is concomitant to the earliest Cambrian agronomic revolution, it was uncommon until the early Ordovician, when locally it records infaunalization related to the Great Ordovician Biodiversification Event.

show abstract

“…Dunham's (1962) nomenclature and modification by Embry and Klovan (1971) was used for the textural classification of carbonates. The new data presented here were integrated with the results of published studies from several decades (e.g., Bahrammanesh, Angiolini, Antonelli, Aghababalou, & Gaetani, 2011;Bayet-Goll et al, 2020;Bozorgnia, 1973;Brenckle, Gaetani, Angiolini, & Bahrammanesh, 2009;Falahatgar, Vachard, & Sakha, 2015;Mossadegh, 2000;Vachard, 1996;Zandkarimi et al, 2016Zandkarimi et al, , 2019 to achieve a synthesis about the palaeoenvironment, palaeogeography, and palaeoclimate of the Mississippian rocks. As a biostratigraphic framework of Mississippian rocks of Alborz, we used the foraminiferal zonation of Zandkarimi et al (2019).…”

Section: Methodsmentioning

confidence: 99%

“…Trace fossils have been analysed based on criteria such as relative abundance, ichnodiversity, and intensity of bioturbation (Taylor & Goldring, 1993). For palaeoclimate interpretation, we used the ichnological zonation presented by Goldring et al (2004), the results of several recently published papers (Bayet‐Goll et al, 2020; Nasiri, Moussavi‐Harami, Mahboubi, & Mosaddegh, 2019; Sharafi, Rodríguez‐Tovar, Bayet‐Goll, et al, 2021) and the geochemical studies of Mousavi‐Taher et al (2021). Palaeogeography has been constructed by comparison and using the works of Stampfli and Borel (2002), Bagheri and Stampfli (2008), Falahatgar et al (2015), Zandkarimi et al (2016, 2019), and Arefifard (2017).…”

Section: Methodsmentioning

confidence: 99%

“…However, the FA2 facies association with stormy structures and high fragmentation of skeletal components is deposited in the middle ramp section. Besides, the widespread pres- However, the main factor could be the effect of the Variscan tectonic movements during the Late Carboniferous, which has affected a large part of the Iranian platform during the Carboniferous, causing subaerial erosion and eliminating thick intervals of the Lower Carboniferous strata (Aghanabati, 2004;Bayet-Goll et al, 2020;Zandkarimi et al, 2019).…”

Section: Depositional Agents: Palaeoenvironmental Implicationsmentioning

confidence: 99%

See 1 more Smart Citation

Palaeoenvironment, palaeogeography, and palaeoclimatology of the Mississippian carbonate ramp in the Alborz tectonostratigraphic zone: Implications for deciphering the controlling factors on ramp evolution

Zandkarimi¹,

Bayet‐Goll

Falahatgar³

et al. 2022

Geological Journal

Self Cite

View full text Add to dashboard Cite

The Mississippian successions of the Alborz tectonostratigraphic zone have been studied in several sections (Dozdehban, Naserabad, Shahmirzad, and Mighan) extending from north to southeast. The sedimentological data indicate three main facies associations (FA): (FA1) a basin to distal outer ramp of low‐energy, low‐oxygen environment with low bioturbation and less developed in situ fossils; (FA2) a middle ramp facies accompanied by storm‐induced sediments (tempestites), echinoderm‐dominated mud mounds, and high fragmentation of skeletal components; and (FA3) an inner ramp facies, represented by sand shoal, and lagoonal/back‐barrier, mainly characterized by the dominance of oolitic, bioclast, and intraclast grainstones. The sedimentary features imply the formation of the succession on a broad flat‐topped, high‐to‐moderate‐energy shelfal carbonate ramp which had been open to the N/NE, the downslope direction, as revealed by local palaeoenvironmental reconstructions. Analysis of several proxies indicates a subtropical palaeoclimate evidenced by (a) widespread tempestite facies and occurrence of storm‐depositional processes, (b) diverse and abundant pellet‐forming thalassinoideans and burrowing echinoids trace fossil assemblages, (c) geochemical proxy indicating a palaeotemperature of 23°–25°, and (d) a rich subtropical heterozoan fossil association. The data provided here imply the palaeolatitudinal position of the Alborz Mississippian ramp is 30–40°S along the southern margin of the Palaeotethys.

show abstract

Variations of the trace fossil Zoophycos with respect to paleoenvironment and sequence stratigraphy in the Mississippian Mobarak Formation, northern Iran

Cited by 16 publications

References 59 publications

Palaeogeographic reconstruction and sequence architecture of the middle‐upper Jurassic successions of Hawraman Basin (NW Iran): Implications for tectono‐depositional processes of the northeastern passive margin of the Arabian Plate

Palaeogeographic reconstruction and sequence architecture of the middle‐upper Jurassic successions of Hawraman Basin (NW Iran): Implications for tectono‐depositional processes of the northeastern passive margin of the Arabian Plate

CrowdedTrichophycusichnofabrics in the early Ordovician successions of central Iran: insight into the Ordovician radiation

Palaeoenvironment, palaeogeography, and palaeoclimatology of the Mississippian carbonate ramp in the Alborz tectonostratigraphic zone: Implications for deciphering the controlling factors on ramp evolution

Contact Info

Product

Resources

About