Warm-water carbonates in proximity to Gondwanan ice–sheets: A record from the Upper Paleozoic of Iran

Abadi, Mehrdad Sardar; Soreghan, Gerilyn S.; Heavens, N. G.; Voeten, Dennis F. A. E.; Ivanova, R. M.

doi:10.1016/j.palaeo.2018.09.008

Cited by 7 publications

(13 citation statements)

References 46 publications

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“…Sea surface temperatures (SST) modeled for the Paleo-Tethys and Panthalassic Ocean indicate significant contrasts between the two regions, with relatively warm sea surface temperatures (SSTs) affecting the Central Persian Terranes and cooler SSTs along the northwestern margin of Gondwana. Despite the warm SSTs of the Central Persian Terranes (present-day Iran) recorded in both data and modeling results for this interval (Sardar Abadi et al, 2019), coldclimate conditions prevailed immediately south of the study area (∼1000 km), evinced by coeval glacial deposits preserved across the Arabian region throughout the upper Pennsylvanian and Lower Permian record (Melvin and Sprague, 2006;Bussert, 2014).…”

Section: Geological Settingmentioning

confidence: 91%

“…The Central Persian Terranes encompass continental segments including the Alborz Basin, Sanandaj-Sirjan Zone, and Central Iran positioned along the Arabian margin of Gondwana at ∼30° S during Pennsylvanian-Early Permian time. Sedimentologic and paleontologic proxies recovered from the Central Persian Terranes record the formation of warm, shallow marine carbonates in proximity to Gondwanan glaciations throughout the Late Pennsylvanian-earliest Permian (Sardar Abadi et al, 2019). Sea surface temperatures (SST) modeled for the Paleo-Tethys and Panthalassic Ocean indicate significant contrasts between the two regions, with relatively warm sea surface temperatures (SSTs) affecting the Central Persian Terranes and cooler SSTs along the northwestern margin of Gondwana.…”

Section: Geological Settingmentioning

confidence: 99%

“…In the Central Persian Terranes, Pennsylvanian-Permian strata accumulated in mid-to inner-ramp facies belts across an extensive shallow marine carbonate ramp (Sardar Abadi et al, 2019). The Moscovian Absheni Formation (middle Pennsylvanian) in the S-S Zone preserves a variety of phylloid algal deposits and microbial carbonates that formed at or near wave base and broad oolitic shoals that accumulated above wave base.…”

Section: Depositional Settingmentioning

confidence: 99%

“…Hand samples (n = 266) were collected at 20-30 cm intervals from one section in the Moscovian (middle Pennsylvanian-36°28′23.43″N, 54°09′39.87″E) and one in the Asselian (Lower Permian-31°46′25.23″N, 52°08′44.91″E), each ∼28 m thick (Fig. 2, Sardar Abadi et al, 2019). Both intervals span ages that coincide with the late Paleozoic glaciation with the Asselian hosting peak icehouse conditions (e.g., Montañez and Poulsen, 2013;Soreghan et al, 2019).…”

Section: Sampling and Depositional Facies Analysismentioning

confidence: 99%

“…To assess whether atmospheric dustiness extended beyond the equatorial region and determine any links between atmospheric dust flux and glacial-interglacial cycles, we examined the Permo-Pennsylvanian strata from the eastern subtropics of Pangaea in present-day Iran. The Central Persian Terranes near the Arabian margin of northeastern Gondwana were situated along the southern margin of the Paleo-Tethyan Ocean at ∼30°S and record deposition of warm water, shallow marine carbonates throughout middle Pennsylvanian-earliest Permian time (Sardar Abadi et al, 2019). The broad distribution of carbonates of this age across the Central Persian Terranes indicates the presence of a widespread carbonate platform isolated from siliciclastic influx except for that delivered by eolian influx.…”

Section: Introductionmentioning

confidence: 99%

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Atmospheric dust flux in northeastern Gondwana during the peak of the late Paleozoic ice age

et al. 2020

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The silicate mineral fraction of shallow marine carbonates archives dust contributions to the Central Persian Terranes along the northeastern margin of Gondwana (∼30ºS paleolatitude), enabling reconstruction of atmospheric dust loading and circulation for intervals of the late Paleozoic ice age. The Central Persian Terranes hosted cyclic deposition of warm water carbonates from middle Pennsylvanian to earliest Permian time, and our data set includes two ∼28 m sections from the Moscovian and Asselian sampled at 20 cm intervals. Bounding surfaces between successive cycles (high-frequency sequences) are recognized by either abrupt basinward shifts in facies or subtle exposure features; these high-frequency sequences range from 1 m to 5 m thick and are interpreted to record glacioeustatic variations. Time series analysis of the dust fraction through the studied interval supports the hypothesis of orbital forcing for the dust signal. The stratigraphic pattern of the dust flux indicates minimal flux during interglacial highstands (0.19−0.27 g/cm2/kyr) and peak flux during glacial lowstands (3.77−4.57 g/cm2/kyr) after accounting for hiatal time at sequence boundaries. Grain size analysis of the dust for all samples (n = 230) reveals modal sizes (volume-based) of 1−15 µm through the Moscovian interval and 10−75 µm through the Asselian interval. Dust deposition increased during glacial times relative to interglacial times by a factor of 16 to 19. Additionally, the Asselian interval exhibits higher dust flux overall relative to the Moscovian interval, which is interpreted to reflect the more extreme icehouse conditions of the Asselian. Variation in the dust content through the studied sections provides an indicator of temporal changes in atmospheric loading that varied at both glacial−interglacial and higher-frequency (<104 yr) scales. Geochemical data reveal that the Arabian−Nubian Shield and southwestern Pangaea (South America) are the most likely sources of dust deposition in the Central Persian Terranes, with sources shifting during different phases. Increased dust flux during glacials likely reflects multiple factors, including enhanced aridity in the source region, exposure of shelf regions, and potential changes in winds. However, the discrepancy in model reconstructions of the amplitude of glacial−interglacial dust variations indicates that increased production of dust sourced by dynamic glaciation played a large role in enhancing dust flux during glacial phases.

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Section: Geological Settingmentioning

confidence: 91%

Section: Geological Settingmentioning

confidence: 99%

Section: Depositional Settingmentioning

confidence: 99%

Section: Sampling and Depositional Facies Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Atmospheric dust flux in northeastern Gondwana during the peak of the late Paleozoic ice age

et al. 2020

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Microfacies and stable isotope analyses (δ13C and δ18O) of the upper Serpukhovian-Moscovian carbonates in the Hadim Nappe, southern Turkey: an approach to document the Late Paleozoic Ice Age (LPIA)

Akbaş

Okuyucu

Yılmaz

2022

Facies

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Geochemistry of upper Palaeozoic ‘thin-layer’ limestones in the southern North China Craton: implications for closure of the northeastern Palaeotethys Ocean

Jun

Gui²,

Chen

et al. 2021

Geol. Mag.

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During the late Palaeozoic Era, a series of related marine strata dominated by multi-layer limestones were deposited in the southern North China Craton. In order to gain new insights into the systematic geochemistry of the carbonate succession of the representative formation (Taiyuan Formation), we examined 59 limestone samples collected from the Huaibei Coal Basin (HCB), with a view towards quantitatively determining the major and trace elements and stable isotope compositions. The data obtained can provide essential evidence for reconstruction of the depositional palaeo-environment and tectonic setting of the Taiyuan Formation. Both X-ray diffraction analyses and palaeoredox proxies (e.g. V/Cr, V/(V + Ni) and authigenic U) indicated that the limestone layers were deposited in an oxic–dysoxic zone, with calcite as the main component. Moreover, palaeomagnetic evidence provided support for the conclusion that these limestones were laid down within an epicontinental sea depositional environment under a warm or hot palaeoclimate during the transition between late Carboniferous and early Permian time. Additionally, evidence obtained from our analyses of trace and rare earth elements revealed that the tectonic setting of the Taiyuan Formation (L1–L5) in the HCB transited from an open ocean to a passive continental margin, thereby indicating that this transformation stemmed from the subduction closure of the northeastern Palaeotethys Ocean. The findings of this study would be of interest to those working on the upper Palaeozoic marine strata in the southern North China Craton.

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Warm-water carbonates in proximity to Gondwanan ice–sheets: A record from the Upper Paleozoic of Iran

Cited by 7 publications

References 46 publications

Atmospheric dust flux in northeastern Gondwana during the peak of the late Paleozoic ice age

Atmospheric dust flux in northeastern Gondwana during the peak of the late Paleozoic ice age

Microfacies and stable isotope analyses (δ13C and δ18O) of the upper Serpukhovian-Moscovian carbonates in the Hadim Nappe, southern Turkey: an approach to document the Late Paleozoic Ice Age (LPIA)

Geochemistry of upper Palaeozoic ‘thin-layer’ limestones in the southern North China Craton: implications for closure of the northeastern Palaeotethys Ocean

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