Depositional environments and ichnology of the deep-marine succession of the Amiran Formation (upper Maastrichtian–Paleocene), Lurestan Province, Zagros Fold–Thrust Belt, Iran

Bayet‐Goll, Aram; Carvalho, Carlos Neto de; Moussavi‐Harami, Reza; Mahboubi, Asadollah; Nasiri, Yaghub

doi:10.1016/j.palaeo.2014.02.019

Cited by 27 publications

(18 citation statements)

References 59 publications

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“…With respect to the location within the system, bed type association 3.3 is interpreted to be lateral to the main sediment flux pathways, and can be interpreted as intralobe splay or lobe fringe (Brunt et al, 2013;Terlaky et al, 2016). The increased intensity of bioturbation away from the other bed type associations also supports this interpretation (Heard & Pickering, 2008;Bayet-Goll et al, 2014.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 83%

Hybrid event beds in the proximal to distal extensive lobe domain of the coarse-grained and sand-rich Bordighera turbidite system (NW Italy)

Mueller

Patacci

Giulio

2017

Marine and Petroleum Geology

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The Upper Cretaceous Bordighera Sandstone of NW Italy is a coarse-grained, sand-rich elongated turbidite system (ca. 15 x 45 km in outcrop) up to 250 meters thick, interpreted to have been deposited in a trench setting. The siliciclastic succession interfingers with muddy calcareous turbidites, which become more abundant toward the lateral and distal domains. Bed type associations allow the distinction of a proximal channelized domain which transitions to a more distal lobe domain, characterized by abundant mudclast-rich sandstones and by bipartite and tripartite beds with a mud-rich middle or upper division (hybrid event beds).The transition between the proximal and distal domains occurs over a relatively limited spatial extent (ca. 5 km). The presence of lenticular bed-sets made up of coarse grained and mud-poor sandstones throughout the distal domain suggests that distributary channels were present, indicating sediment bypass further down-dip toward the most distal and not preserved parts of the system. Hybrid event beds -commonly associated with distal and marginal fan environments such as fan fringes -are present throughout the lobe domain and extend for up to ca. 30 km in down-dip distance. They are more abundant in the proximal and axial depositional lobe domain and their appearance occurs within a short basin-ward distance from the inferred channel-lobe transition zone. Flow expansion at the termination of the channelized domain and the enhanced availability of cohesive substrate due to the presence of intra-basinal muddy calcareous beds are interpreted as the key controls on pronounced argillaceous sandstone distribution. The abrupt appearance and the persistent occurrence of such beds across an extensive domain have implications for characterizing bed-scale (subseismic) heterogeneity of deep-water clastic hydrocarbon reservoirs.

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Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 83%

Hybrid event beds in the proximal to distal extensive lobe domain of the coarse-grained and sand-rich Bordighera turbidite system (NW Italy)

Mueller

Patacci

Giulio

2017

Marine and Petroleum Geology

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“…Regularly thin‐bedded, fine‐ to very fine‐grained turbidites with good lateral continuity and high contents of relatively thick mudstone facies support an interpretation of BTA 3c as lobe distal fringe with the deposition of dilute low concentration turbidity currents or basin plain with slow hemipelagic deposition. The interpretation of the lateral lobe fringe depositional environment is further supported by the intensity of bioturbation in BTA 3c as observed at Locality 4 (see Bayet‐Goll, Monaco, Jalili, & Mahmudie‐Gharaie, 2016; Bayet‐Goll, Neto de Carvalho, Moussavi‐Harami, Mahboubi, & Nasiri, 2014; Heard & Pickering, 2008).…”

Section: Bed Type Associations and Their Palaeoenvironmental Significancementioning

confidence: 78%

Facies and bed type characteristics of channel‐lobe transition deposits from the Oligocene‐Miocene Tajau Sandstone Member, Kudat Formation, Sabah, Malaysia

Mansor

Hassan

2021

Geological Journal

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Channel‐lobe transition zones (CLTZs) are identified in many modern deep‐water systems, but few exhumed examples have been identified. Exposures of the Oligocene‐Miocene Tajau Sandstone Member (TSM), Kudat Formation, northern Sabah, Malaysia, provides the opportunity to document a CLTZ from an active basin margin. This work provides the first detailed field‐based sedimentological logging to produce a quantitative database on facies, sedimentary structures, bed type, and statistical analysis. This is particularly important to produce a robust stratigraphic framework of the TSM. Sedimentary facies support interpretation of subaqueous sediment density flows, and key features, including scour‐fills, antidunes, and dune‐scale bedforms, suggest changes in gradient and/or flow confinement and the development of hydraulic jumps. Eight bed types are recognized including: (a) tripartite beds with a debrite (BT1), interpreted as hybrid event beds recording downslope flow transformation between turbulent and laminar states; (b) beds with a mixture of depositional, erosional, and bypass features (BT2, BT4, BT5), interpreted as recording the transitions between supercritical and subcritical flow conditions triggered by hydraulic jumps; (c) bipartite beds with a basal massive sandstone overlain by fine‐grained facies (BT3), interpreted as hyperconcentrated flow deposits with evidence of downcurrent flow transformation; (d) bipartite beds with a basal high‐density turbidite sharply overlain by a low‐density turbidite (BT6), interpreted as turbidites with evidence of sediment bypass; (e) basal tractive structures capped by fine‐grained facies as the product of reworking of very coarse‐ to coarse‐grained sediments caused by lateral spreading of turbulent flows; and (f) Bouma Tbcde sequences (BT8) interpreted as high‐to‐low‐density turbidites. Our depositional model for the TSM comprises: (a) an aggradational channel‐lobe transition zone (CLTZs/BTA 1 and BTA 2) which was dominated by hydraulic jumps and sediment bypass; and (b) stacked lobe (i.e., lobe‐axis/BTA 3a, lobe‐off axis/BTA 3b, frontal lobe fringe/BTA 3c, and distal lobe fringe/BTA 3d) located in the northern and southern parts of the study area, which is dominated by tabular, sheet‐like elements bioturbated with the Nereites ichnofacies. The aggradational stacking of CLTZs deposits observed in the TSM may be explained by high subsidence rates combined with high sediment supply rates associated with a tectonically active margin setting.

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“…The decrease in sedimentation rate and grain size of turbidity currents leading to emplacement of discrete turbidite sandstone separate by mudstone intervals, rather than amalgamated sandstone beds. In addition to wrinkle structures, the high abundance of predepositional elements indicates long‐term stability on the sea‐floor with respect to ecologic conditions between successive phases of turbidite sedimentation (Bayet‐Goll et al, 2014, 2016; Callow et al, 2014; Heard & Pickering, 2008; Uchman, 1995).…”

Section: Discussionmentioning

confidence: 99%

“…The absence of wrinkle structures in shale beds does not necessarily mean the absence of mat‐forming organisms or the absence of mats; rather, it points to the absence of appropriate conditions for the preservation of these structures (Mata & Bottjer, 2009). Compared to B2 and B3 facies associations, decrease in diversity and abundance of trace fossils in hemipelagic mudstone and siltstone, especially the absence of graphoglyptids, is the result of thick turbiditic mudstone leading to substrate instability and the absence of a casting medium (see Uchman, 1995; Heard & Pickering, 2008; Cummings & Hodgson, 2011; Bayet‐Goll, Neto De Carvalho, et al, 2014; Callow et al, 2014 for more discussion).…”

Section: Discussionmentioning

confidence: 99%

The interplay of environmental constraints and bioturbation on matground development along the marine depositional profile during the Ordovician Radiation

et al. 2021

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This study documents the distribution of matgrounds in a wide variety of environments recorded in the Ordovician Lashkerak and Ghelli Formations in the Alborz Mountains of northern Iran in order to evaluate controls on their distribution along the marine depositional profile. Detailed facies analysis allowed differentiating three groups of facies associations in the Lower to Upper Ordovician deposits of the Lashkerak formation: (i) estuarine system; (ii) wave‐dominated shoreface‐offshore complex; and (iii) mixed river‐ and wave‐influenced deltaic system. The Middle to Upper Ordovician deposits of the Ghelli formation are divided into two groups of facies associations: (i) tide‐influenced deltaic succession and (ii) deep‐water fan system. Microbially induced sedimentary structures (MISS) are present in deposits formed in the central estuarine basin (Lashkerak formation) and in proximal lobes and lobe fringes of deep–water turbidite fans (Ghelli formation). On the contrary, MISS are absent in deposits from the wave‐dominated shoreface‐offshore complex, river‐ and tide‐dominated deltas, and various subenvironments of the incised wave‐dominated estuary (i.e., bayhead delta and estuary mouth) and the deep‐marine turbidite fan system (i.e., turbidite channel, slope, and outer lobe). The lack of evidence of mat‐building microorganisms in the deltaic systems may have resulted from two factors: (1) high physico‐chemical stressors caused by river‐induced processes, and (2) increase in degree of sediment disturbance, biodiffusion, and bioirrigation by burrowing organisms. Formation of microbial mats in the wave‐dominated shoreface‐offshore complex was inhibited by the activity of an abundant and diverse infauna capable of reworking the sediment. Our analysis shows that the spatial distribution of microbial mats was controlled by an interplay of environmental factors and innovations in animal‐substrate interactions, mostly expressed by secular changes in bioturbation. This study supports the notion that the agronomic revolution was diachronic, with marginal‐marine and deep‐sea ecosystems lagging behind shallow‐marine settings.

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Depositional environments and ichnology of the deep-marine succession of the Amiran Formation (upper Maastrichtian–Paleocene), Lurestan Province, Zagros Fold–Thrust Belt, Iran

Cited by 27 publications

References 59 publications

Hybrid event beds in the proximal to distal extensive lobe domain of the coarse-grained and sand-rich Bordighera turbidite system (NW Italy)

Hybrid event beds in the proximal to distal extensive lobe domain of the coarse-grained and sand-rich Bordighera turbidite system (NW Italy)

Facies and bed type characteristics of channel‐lobe transition deposits from the Oligocene‐Miocene Tajau Sandstone Member, Kudat Formation, Sabah, Malaysia

The interplay of environmental constraints and bioturbation on matground development along the marine depositional profile during the Ordovician Radiation

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