Tectonic and eustatic controls on the spatial distribution and stratigraphic architecture of late early Cambrian successions at the northern Gondwana margin: The siliciclastic-carbonate successions of the Lalun Formation in central Iran

Bayet‐Goll, Aram; Geyer, Gerd; Daraei, Mehdi

doi:10.1016/j.marpetgeo.2018.08.002

Cited by 26 publications

(13 citation statements)

References 39 publications

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“…During the early stage of base‐level rise (lowstand normal regression), an overall fining‐upward fluvial profile is produced by an increase in accommodation space and subsequent deposition of floodplain sediments (prone to developing and preserving MISS). However, lowstand fluvial deposits of the Lalun Formation were deposited in a region with low‐gradient relief adjacent to coastal areas (Bayet‐Goll et al ., 2018a). High fluvial aggradation took place in this setting without leading to deposition of floodplain sediments (Catuneanu, ).…”

Section: Discussionmentioning

confidence: 99%

“…The present study focuses on the Lalun Formation of the central‐East Iranian Microplate (CEIM) which has been studied in some detail by Bayet‐Goll et al . (2018a). Data on the evolution of Cambrian depositional phases along this eastern margin of the Prototethys are important not only for the eustatic versus tectonic controls on depositional systems for this part of the shelf margin of Gondwana, but also in providing an analogue for platforms of similar age in the Middle East and elsewhere.…”

Section: Geological Settingmentioning

confidence: 99%

“…B) and Arabia (lower part of the Sagh Sandstone), have been deposited in continental to marginal‐marine environments (Aghanabati, ; Bayet‐Goll et al ., , , , 2018a; Geyer et al ., ). By the end of the early Cambrian, a eustatic sea‐level fall led to a regression with considerable effects along the West Gondwanan margin and in adjacent Cambrian continents, and this regression characterizes the deposition of at least part of the Lalun Formation, so that the formation offers insight into fine‐scale depositional evolution in the Cambrian Stage 4 and an understanding of processes which governed the regressive phase at the lower–middle Cambrian boundary interval in this part of the Earth (Bayet‐Goll et al ., 2018a). The Lalun Formation is one of the most extended rock units of the early Cambrian in Iran, demonstrating comparable lithology across the country.…”

Section: Geological Settingmentioning

confidence: 99%

“…A comprehensive facies analysis and sequence stratigraphy of the Lalun Formation in Central Iran have been presented by Bayet‐Goll et al . (2018a). Five vertically stacked groups of facies associations can be distinguished in the formation, which include: (i) a fluvial facies association; (ii) an estuarine facies association; (iii) an open coast tidal flat facies association; (iv) a peritidal carbonate facies association; and (v) a delta facies association (Fig.…”

Section: Geological Settingmentioning

confidence: 99%

“…Ravinement surfaces in the estuarine setting (RS) were generated by wave erosion (WRS) or tidal current erosion (TRS) and were covered by transgressive deposits with an onlap configuration. The shift from bioturbated beds (C1, lower shoreface; see Bayet‐Goll et al ., 2018a) into bioturbated heterolithic sandstone/mudstone beds of sand‐flat to mixed‐flat beds (C1) is interpreted as a transition to open marine conditions (MFS).…”

Section: Sequence Stratigraphy Of the Lalun Formation And Distributiomentioning

confidence: 99%

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Palaeoecological, sedimentological and stratigraphical insights into microbially induced sedimentary structures of the lower Cambrian successions of Iran

Bayet‐Goll

Daraei

2020

Sedimentology

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Micro‐organisms producing microbially induced sedimentary structures, particularly epibenthic cyanobacteria, are not facies‐dependent and could flourish in any environment if appropriate ecological conditions were provided. Hence, the changes in environmental parameters are the controlling factors on ecological tolerance of the producers. This study on the lower Cambrian successions of the Lalun Formation in Central Iran shows that paralic environments reacted differently to changes in parameters such as river and tide energy, palaeo‐topography, the rate of sediment supply and fluctuations in sea‐level, even though all were characterized by sandy substrates suitable for the development of microbially induced sedimentary structures. Therefore, the abundance and preservation of microbially induced sedimentary structures varied in the different paralic environments. From a sequence stratigraphic viewpoint, this study demonstrates that erosional discontinuities lacked the conditions required for the substrate stabilization by microbial communities. The distribution, size and type of microbially induced sedimentary structures within high frequency cycles generally follow the trends of changes in vertical facies stacking patterns. Within systems tracts, the pattern, morphological diversity and size of microbially induced sedimentary structures are not dependent on the type of systems tract, but on the type of depositional system developed such as delta, incised valley, coastal plain, estuaries and shoreline to shelf systems. Generally, estuarine and peritidal carbonates record an increase in the development of mat colonization during the transgressive systems tract, owing to decreased sedimentation rate as well as extended shallow water habitats. In contrast, the existence of microbially induced sedimentary structures depends on the pattern of shoreline shift in depositional systems developed during the highstand systems tract, such as open coast tidal flat and delta environments. If a shoreline regression was continuous (depositional trend and stacking pattern are a set of high frequency cycles), a greater increase in the aggradational component than the progradational component would cause intensified destructive processes hindering the development of microbial communities.

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Section: Discussionmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Sequence Stratigraphy Of the Lalun Formation And Distributiomentioning

confidence: 99%

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Palaeoecological, sedimentological and stratigraphical insights into microbially induced sedimentary structures of the lower Cambrian successions of Iran

Bayet‐Goll

Daraei

2020

Sedimentology

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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

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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.

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Architectural evolution of a mixed-influenced deltaic succession: Lower-to-Middle Ordovician Armorican Quartzite in the southwest Central Iberian Zone, Penha Garcia Formation (Portugal)

Bayet‐Goll

Carvalho

2020

Int J Earth Sci (Geol Rundsch)

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Tectonic and eustatic controls on the spatial distribution and stratigraphic architecture of late early Cambrian successions at the northern Gondwana margin: The siliciclastic-carbonate successions of the Lalun Formation in central Iran

Cited by 26 publications

References 39 publications

Palaeoecological, sedimentological and stratigraphical insights into microbially induced sedimentary structures of the lower Cambrian successions of Iran

Palaeoecological, sedimentological and stratigraphical insights into microbially induced sedimentary structures of the lower Cambrian successions of Iran

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

Architectural evolution of a mixed-influenced deltaic succession: Lower-to-Middle Ordovician Armorican Quartzite in the southwest Central Iberian Zone, Penha Garcia Formation (Portugal)

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