Plate Tectonic Evolution of the Southern Margin of Laurussia in the Paleozoic

Golonka, Jan; Gawęda, Aleksandra

doi:10.5772/50009

Cited by 43 publications

(41 citation statements)

References 52 publications

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“…This period also saw the rifting of the Palaeotethys resulting in a separation of the north China, Indochina, Tarim and South China blocks from Gondwana (Metcalfe 1984(Metcalfe , 2011. Connections between South China and north-west Australia were maintained in the Late Devonian by the occurrence of an extensive, shallow water shelf (Golonka 2007;Metcalfe 2011;Golonka and Gaweda 2012). Previous work on Late Devonian conodonts (Burrett et al 1990;Girard et al 2010) and fish (Long 1993) support a close relationship between the two areas.…”

Section: Biogeography and Chondrichthyan Assemblagesmentioning

confidence: 80%

Upper Devonian microvertebrates from the Canning Basin, Western Australia

Roelofs

Playton

Barham

et al. 2015

Acta Geologica Polonica

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A diverse microvertebrate fauna is described from the Virgin Hills and Napier formations, Bugle Gap Limestone Canning Basin, Western Australia. Measured sections at Horse Spring and Casey Falls (Virgin Hills Formation) and South Oscar Range (Napier Formation) comprise proximal to distal slope carbonates ranging in age from the Late Devonian Frasnian to middle Famennian. A total of 18 chondrichthyan taxa are identified based on teeth, including the first record of Thrinacodus tranquillus, Cladoides wildungensis, Protacrodus serra and Lissodus lusavorichi from the Canning Basin. A new species, Diademodus dominicus sp. nov. is also described and provides the first record of this genus outside of Laurussia. In addition, the upper range of Australolepis seddoni has been extended to Late Devonian conodont Zone 11, making it the youngest known occurrence for this species. The Virgin Hills and Napier formations microvertebrate faunas show close affinities to faunas recovered from other areas of Gondwana, including eastern Australia, Iran, Morocco and South China, which is consistent with known conodont and trilobite faunas of the same age.

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Section: Biogeography and Chondrichthyan Assemblagesmentioning

confidence: 80%

Upper Devonian microvertebrates from the Canning Basin, Western Australia

Roelofs

Playton

Barham

et al. 2015

Acta Geologica Polonica

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“…Climate proxies (Yapp and Poths, 1992) and continental weathering models (Berner, 2006;Nardin et al, 2011) indicate that the Ordovician CO 2 atmospheric partial pressure (pCO 2 ) was equal to some 8-20 times its preindustrial atmospheric level (1 PAL = 280 ppm). Fainter Sun (Gough, 1981) somewhat reduces this apparent discrepancy between high CO 2 levels and glacial inception by suggesting that the solar constant was lower in the past. Nevertheless, it seems insufficient; the best hypotheses today consider a Late Ordovician drop in CO 2 to be the trigger of glaciation (Brenchley et al, 1994;Kump et al, 1999;Villas et al, 2002;Lenton et al, 2012).…”

Section: A Pohl Et Al: Effect Of the Ordovician Paleogeography On Tmentioning

confidence: 99%

“…No ice sheet was prescribed on the land. The solar luminosity was set 3.5 % below present according to the model of solar physics provided by Gough (1981), and we used the "cold summer orbital configuration" (CSO). The CSO is defined with an obliquity of 22.5 • , an eccentricity of 0.05 and a longitude of perihelion of 270 • .…”

Section: Methodsmentioning

confidence: 99%

“…An immediate explanation lies in the prescribed solar constant. We chose a solar constant 3.5 % weaker than today following the parametric law from Gough (1981). Previous studies mostly used a 4.5 % depressed insolation compared to present-day (Crowley and Baum, 1995;Gibbs et al, 1997;Herrmann et al, 2003Herrmann et al, , 2004b, following the constant rate of decrease of 1 % every hundred million years proposed by Crowley and Baum (1992).…”

Section: Sensitivity To An Atmospheric Co 2 Decreasementioning

confidence: 99%

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Effect of the Ordovician paleogeography on the (in)stability of the climate

et al. 2014

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Abstract. The Ordovician Period (485-443 Ma) is characterized by abundant evidence for continental-sized ice sheets. Modeling studies published so far require a sharp CO 2 drawdown to initiate this glaciation. They mostly used nondynamic slab mixed-layer ocean models. Here, we use a general circulation model with coupled components for ocean, atmosphere, and sea ice to examine the response of Ordovician climate to changes in CO 2 and paleogeography. We conduct experiments for a wide range of CO 2 (from 16 to 2 times the preindustrial atmospheric CO 2 level (PAL)) and for two continental configurations (at 470 and at 450 Ma) mimicking the Middle and the Late Ordovician conditions. We find that the temperature-CO 2 relationship is highly non-linear when ocean dynamics are taken into account. Two climatic modes are simulated as radiative forcing decreases. For high CO 2 concentrations (≥ 12 PAL at 470 Ma and ≥ 8 PAL at 450 Ma), a relative hot climate with no sea ice characterizes the warm mode. When CO 2 is decreased to 8 PAL and 6 PAL at 470 and 450 Ma, a tipping point is crossed and climate abruptly enters a runaway icehouse leading to a cold mode marked by the extension of the sea ice cover down to the midlatitudes. At 450 Ma, the transition from the warm to the cold mode is reached for a decrease in atmospheric CO 2 from 8 to 6 PAL and induces a ∼ 9 • C global cooling. We show that the tipping point is due to the existence of a 95 % oceanic Northern Hemisphere, which in turn induces a minimum in oceanic heat transport located around 40 • N. The latter allows sea ice to stabilize at these latitudes, explaining the potential existence of the warm and of the cold climatic modes. This major climatic instability potentially brings a new explanation to the sudden Late Ordovician Hirnantian glacial pulse that does not require any large CO 2 drawdown.

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“…1 in Kowalczewski 1963), as a block foundation of the main paleogeographic-facies units (see Szulczewski 1977; see also the Niewachlów Fault in Konon 2007, figs. 2-3), as well as the basin topography in the Górno area, where a localized shoal developed in a labile depressional structure (see the facies pattern in , framed by transversal dislocation zones related to the VII and VIII primary elevations in the deeper Palaeozoic basement (sensu Kowalczewski 1963) Cross Mountains was situated on the southern shelf of Laurussia or, in other words, on the northern shore of a relatively narrow Rheic Ocean (= Variscan Sea; Scotese and McKerrow 1990;Golonka and Gawęda 2012;Halamski and Baliński 2013). The brachiopods studied in the present paper come from the Radlin Syncline, a subordinate unit of the Kielce-Łagów Synclinorium, the latter being a major tectonic element of the southern (Kielce) region of the Holy Cross Mountains (Text- fig.…”

Section: Introductionmentioning

confidence: 99%

Brachiopods and stratigraphy of the Upper Devonian (Frasnian) succession of the Radlin Syncline (Holy Cross Mountains, Poland)

Baliński¹,

Racki²,

Halamski³

2016

Acta Geologica Polonica

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ABSTRACT:Baliński, A., Racki, G. and Halamski, A. T. 2016. Brachiopods and stratigraphy of the Upper Devonian (Frasnian) succession of the Radlin Syncline (Holy Cross Mountains, Poland). Acta Geologica Polonica, 66 (2), 125-174, Warszawa.The lower part of the Frasnian succession in the Radlin Syncline (Kielce-Łagów Synclinorium, southern region of the Holy Cross Mountains), in the two studied successions: Józefka at Górno and (for the first time) Radlin, consists of the rhythmic marly Szydłówek Beds, the fossil-rich limestones of the Wietrznia Beds (locally) and the atypically developed, calcareous Kostomłoty Beds. The carbon isotope chemostratigraphic pattern overall corresponds well to the global Early-Middle Frasnian biogeochemical perturbation, even if the major punctata positive excursion is only fragmentarily recorded in the Kostomłoty intrashelf basin.Two brachiopod assemblages are abundantly represented in both sections: the Phlogoiderhynchus polonicus Assemblage, typical of the Szydłówek Beds, and the Biernatella lentiformis Assemblage, limited to the middle part of the Wietrznia Beds. Both are highly dominated by the index species. Twenty nine lower Frasnian brachiopod species (Craniida -1 species, Strophomenida -1, Productida -2, Protorthida -1, Orthida -5, Pentamerida -1, Rhynchonellida -4, Atrypida -4, Athyridida -3, Spiriferida -4, Spiriferinida -3) are described from the Szydłówek Copper, 1996 and is the youngest known representative of the suborder Davidsonioidea Copper, 1996. Skenidioides cretus Halamski sp. nov. is the last representative of the genus. Statistical investigation of a large sample of Spinatrypina (Exatrypa) explanata did not confirm the existence of two dimorphic forms, coarse-and fine-ribbed.The high-diversity Biernatella lentiformis Assemblage is quite dissimilar to coeval brachiopod assemblages described heretofore from the Holy Cross Mountains region. It is interpreted as consisting of mostly parautochthonous dwellers of deep-slope muddy habitats and a local, occasionally storm-agitated, intra-basin brachiopod-crinoid-coral shoal. The fauna was adapted probably to cooler and nutrient-poor waters during an initial phase of the severe carbon cycle perturbation.

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Plate Tectonic Evolution of the Southern Margin of Laurussia in the Paleozoic

Cited by 43 publications

References 52 publications

Upper Devonian microvertebrates from the Canning Basin, Western Australia

Upper Devonian microvertebrates from the Canning Basin, Western Australia

Effect of the Ordovician paleogeography on the (in)stability of the climate

Brachiopods and stratigraphy of the Upper Devonian (Frasnian) succession of the Radlin Syncline (Holy Cross Mountains, Poland)

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