Preliminary Appraisal of a Correlation Between Glaciations and Large Igneous Provinces Over the Past 720 Million Years

Youbi, Nasrrddine; Ernst, Richard E.; Mitchell, Ross N.; Boumehdi, Moulay Ahmed; Moume, Warda El; Lahna, Abdelhak Ait; Bensalah, Mohamed Khalil; Doblas, Miguel; Tassinari, Colombo Celso Gaeta

doi:10.1002/9781119507444.ch8

Cited by 11 publications

(9 citation statements)

References 202 publications

(214 reference statements)

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“…Conversely, other studies purport that weathering of highly reactive basaltic terranes associated with LIP emplacement is a driver of global cooling (17,37,38,46). However, while we reconstruct the shortterm warming in our model, we see little evidence of most Mesozoic LIPs having a cooling impact.…”

Section: Discussioncontrasting

confidence: 60%

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Limited long-term cooling effects of flood basalt emplacements

Longman,

Mills,

Merdith

2024

Preprint

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The emplacement of large igneous provinces (LIPs) is known to have been a driver of climate change in Earth’s past, particularly during the breakup of Pangaea. However, the balance between climate warming through CO2 emission and climate cooling through increased weathering is poorly understood. To better understand the role of LIP emplacement on long-term climate change, we utilize a coupled climate-biogeochemical model which considers the holistic impact of LIPs through both degassing of CO2 and enhancement of local continental weathering rates. Of the 7 LIPs during the breakup phase of Pangea (approximately between 300 and 150 Ma), only the Central Atlantic Magmatic Province (CAMP) drives long-term cooling in our model, and this is a minor effect despite emplacement of a very large surface area in the humid tropics. Similarly, only the CAMP imparts a clear stepwise change in the long-term strontium isotope record whereas the other LIPs of this period do not. Due to relatively small areal extents, and emplacement often outside the tropical weathering zone, we conclude that most LIPs have no significant global cooling effect on multimillion year timescales.

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Section: Discussioncontrasting

confidence: 60%

“…However, even with extensive tropical LIP emplacement, our model suggests it is unlikely that LIPs can drive global glaciations (Fig. 4), as has been suggested (46).…”

Section: Discussionsupporting

confidence: 51%

Limited long-term cooling effects of flood basalt emplacements

Longman,

Mills,

Merdith

2024

Preprint

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“…High‐resolution stratigraphy of the mid‐Cretaceous is pivotal to understanding how Earth's systems will function in the changing world of today (Montañez et al ., 2011; Tierney et al ., 2020; Scotese et al ., 2021). Specifically, the late Aptian–early Albian was characterized by remarkable biological turnovers, rapid climate changes and major palaeoceanographic events, coeval with reorganization of tectonic plates and a significant increase of ocean crust formation (Rodríguez‐López et al ., 2008; Trabucho‐Alexandre et al ., 2011; Hay & Floegel, 2012; Bottini & Erba, 2018; Carvalho et al ., 2019; Bottini & Faucher, 2020; Scotese, 2021; Youbi et al ., 2021; Bracquart et al ., 2022). A late Aptian–earliest Albian long‐term sea‐level lowstand (Maurer et al ., 2013; Graziano & Raspini, 2015; Graziano et al ., 2016) with cooling of surface and bottom seawater (Hu et al ., 2005; McAnena et al ., 2013; Bodin et al ., 2015; Bottini et al ., 2015; Herrle et al ., 2015) mirrored the expansion of icecaps or glaciers at high latitudes (Price, 1999; Rodríguez‐López et al ., 2016; Alley et al ., 2019; Vickers et al ., 2019).…”

Section: Introductionmentioning

confidence: 99%

New insights into the palaeoenvironmental–palaeoclimatic significance and sedimentary dynamics of carbonate Lagerstätten: The lower Albian of Pietraroja (Southern Italy)

Graziano,

Raspini,

Bartiromo

2023

Sedimentology

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This study reports the first high‐resolution, integrated facies analysis of the lowermost Albian Pietraroja Lagerstätten (Apennine Carbonate Platform) which yields the first dinosaur (Scipionyx samniticus) found in Italy and other terrestrial vertebrates and plants. Aiming to clarify the long‐debated palaeoenvironmental significance of the Pietraroja succession, the following have been carried out: (i) a field survey to establish stratigraphic position and number of the fossil Lagerstätten; (ii) the centimetre‐scale facies analysis of a new section, ca 15 m‐thick, consisting of two new lithostratigraphic units, the ‘Cyclically organized Limestones’ and the ‘Cherty Limestones’; (iii) the scanning electron microscopy – energy dispersive X‐ray spectroscopy and backscattered electron – energy dispersive X‐ray spectroscopy analyses of clay mineral proxies for palaeoclimate and non‐carbonate grains; and (iv) the regional and supra‐regional investigation of the event stratigraphical context of the fossil Lagerstätten, in order to elucidate the controls on their formation. The section includes two out of the three observed fossil‐rich Lagerstätten, each up to 1.5 m‐thick. The arrangement of lithofacies and early diagenetic overprint defines shallow‐water depositional cycles suggestive of precession and short‐eccentricity periodicities. The Middle Lagerstätte yielding Scipionyx samniticus consists of three intervals. The lower, paralic interval was deposited during arid conditions and passes gradually to the plant‐rich, coastal wetland carbonaceous marls of the upper interval. The ‘Cherty Limestones’, yielding the Upper Lagerstätte with terrestrial vertebrates, contains two spiculitic intervals suggesting the development of siliceous sponge meadows in a shallow, restricted lagoon. Genetic stratigraphy suggests that the Pietraroja Lagerstätten were formed during glacioeustatic lowstands; interestingly, the Middle Lagerstätte mirrors the earliest Albian sea‐level lowstand (KAl1 event, ca 111.2 Myr), during a semi‐continuous supply of windblown volcaniclastics. Findings herein substantiate the pivotal role of paralic‐continental Lagerstätten for deriving high‐frequency palaeoclimatic dynamics and glacioeustacy from carbonate platform archives. The origin of Tethyan continental bridges between Africa and Europe during the late Aptian–earliest Albian cold interval is discussed.

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“…The European Northwest African Magmatic Province (EUNWA or EUNWAMP; e.g., [1][2][3] was emplaced during Late Carboniferous-Permian times and has been linked to the gravitational collapse of the previously overthickened and weakened Variscan orogenic belt. The gravitational collapse of the Variscan edifice occurred through simple pure shear low-angle extensional detachments during the late Carboniferous-Permian, giving rise to a Basin and Range type extensional province in Europe, and northwestern Africa involving the unroofing of large metamorphic core complexes and synextensional plutonic bodies, dike and sill swarms, and volcanic successions.…”

Section: Introductionmentioning

confidence: 99%

“…These eruptive cycles are well represented in Morocco in northwestern Africa and also in southern Scandinavia and northern Germany. The huge volume of extruded and intruded magmatic products of the EUNWA province (in the Oslo Graben, the estimated volume is 35,000 km 3 , while in the North German Basin, the total volume of felsic volcanic rocks, mainly rhyolites and rhyodacites, was of the order of 48,000 km 3 ) has led to suggestions of a thermally anomalous mantle plume to explain this magmatic pulse [12,13]. A significant problem of the plume hypothesis is the duration of activity and the helium isotope signature of lithospheric mantle xenoliths from the Scottish Permo-Carboniferous dikes, sills, and vents [14].…”

Section: Introductionmentioning

confidence: 99%

U–Pb Zircon Geochronological and Petrologic Constraints on the Post-Collisional Variscan Volcanism of the Tiddas-Souk Es-Sebt des Aït Ikko Basin (Western Meseta, Morocco)

et al. 2021

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The NE–SW trending Tiddas Souk Es-Sebt des Ait Ikko (TSESDAI) basin, located at 110 km southeast of Rabat, in the region of Khmesset between the village of Tiddas Souk Es-Sebt des Ait Ikko, is the third largest late Palaeozoic continental trough in the northern Central Moroccan Meseta. It is a ~20 km long and ~2–3 km wide basin, comprising mainly mixed volcano-sedimentary reddish-purple continental Permian rocks laying with an angular unconformity on Visean deep marine siliciclastic sediments and unconformably overlain by the Triassic and Cenozoic formations. In this study we aim to better determine the age of Permian volcanics and their chemical and mineralogical characteristics, as well as assess the provenance of inherited zircons, thus contributing to the understanding of the late stages of the Variscan orogeny in Morocco. The standard volcanic succession includes the following terms: (i) andesites, lapilli tuffs and andesitic ash deposits; (ii) accumulations of rhyolitic lavas; (iii) lapilli tuffs and rhyolitic ash (formation F1); (iv) flows and breccias of dacites; (v) andesite flows; and (vi) basaltic flows. The various volcanic and subvolcanic studied rocks display calc-alkaline-series characteristics with high contents of SiO2, Al2O3, CaO, MgO, and relatively abundant alkalis, and low contents of MnO. In the classification diagram, the studied facies occupy the fields of andesites, trachy-basalts, dacites, trachydacites, and rhyolites and display a sub-alkaline behavior. These lavas would be derived from a parental mafic magma (basalts) produced by partial fusion of the upper mantle. Specific chemical analyses that were carried out on the mineralogical phases (biotite and pyroxene) revealed that the examined biotites can be classified as magnesian and share similarities with the calc-alkaline association-field, while the clinopyroxenes are mainly augites and plot on the calc-alkaline orogenic basalt field. Andesites and dacites of TSESDAI show similarities with the rocks of the calc-alkaline series not linked to active subduction and which involve a continental crust in their genesis. The existence of enclaves in the lavas of the TSESDAI massif; the abnormally high contents of Rb, Ba, Th, and La; and the systematic anomalies in TiO2 and P2O5 indicate also a crustal contamination mechanism. Three magmatic episodes are distinguished with two episodes that correspond to an eruptive cycle of calc-alkaline andesites and rhyolites followed by a basaltic episode. The SHRIMP U–Pb geochronologic data of zircons recovered from the rhyolite dome of Ari El Mahsar in TSESDAI basin show a Concordia age of 286.4 ± 4.7 Ma interpreted to date the magmatic crystallization of this dome. Thus, the rhyolite likely belongs to the third magmatic episodes of TSESDAI.

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Preliminary Appraisal of a Correlation Between Glaciations and Large Igneous Provinces Over the Past 720 Million Years

Abstract: Note the default cause for the end of glaciations in rebuilding of CO 2 levels in the atmosphere due to steady state volcanism until a critical point is reached. We note cases where a specific LIP event may have had a cause in the end of the glaciation (Table 8.1).

Cited by 11 publications

References 202 publications

Limited long-term cooling effects of flood basalt emplacements

Limited long-term cooling effects of flood basalt emplacements

New insights into the palaeoenvironmental–palaeoclimatic significance and sedimentary dynamics of carbonate Lagerstätten: The lower Albian of Pietraroja (Southern Italy)

U–Pb Zircon Geochronological and Petrologic Constraints on the Post-Collisional Variscan Volcanism of the Tiddas-Souk Es-Sebt des Aït Ikko Basin (Western Meseta, Morocco)

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