Stratigraphic Commission Accelerates Progress, 1984 to 1989

Cowie, J. W.; Ziegler, Willi; Remane, Jürgen; Iugs,

doi:10.18814/epiiugs/1989/v12i2/003

Cited by 133 publications

(39 citation statements)

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“…This datum establishes a maximum Late Viséan-Early Namurian depositional age for the San Clodio Formation according to the geological timetables of Cowie & Bassett (1989) and Haq & Van Eysinga (1998). Moreover, the apparent absence of younger zircons in an area of active tectonism and abundant syntectonic magmatism, ranging between 350 and 310 Ma (Gallastegui 1993;Fernández-Suárez et al 2000a), suggests that the Early Namurian is probably the actual age of sedimentation.…”

Section: Age Populations In Pre-orogenic Samplesmentioning

confidence: 66%

Provenance constraints from detrital zircon U–Pb ages in the NW Iberian Massif: implications for Palaeozoic plate configuration and Variscan evolution

Catalán

Fernández‐Suárez

Jenner

et al. 2004

JGS

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Detrital zircons from pre-orogenic Upper Ordovician to Devonian low-grade metasedimentary rocks have been dated by laser ablation-inductively coupled plasma mass spectrometry (LA-ICP-MS) to: (1) constrain the variations of zircon age populations within the autochthonous sequences of NW Iberia; (2) compare U-Pb detrital zircon ages with previous data; (3) test the hypothesis of the Armorica microplate as a peri-Gondwanan terrane separated from Gondwana. The similarity in the ages of detrital zircons found in the Palaeozoic samples studied here to those published for the Upper Proterozoic, Lower Cambrian and Lower Ordovician sediments of NW Iberia argues against the separation of Armorica, and points to a common source area for all of the Palaeozoic detrital formations of NW Iberia, the West African craton and the surrounding Pan-African belts. LA-ICP-MS U-Pb dating of zircons from a synorogenic flysch preserved in klippen in the core of a syncline establishes a maximum depositional age for this deposit as Early Namurian. This age is also a maximum age limit for thrusting and refolding in this part of the Iberian Massif. Correlation of the zircon age populations with published ages confirms the link between the emplacement of the allochthonous complexes of NW Iberia and synorogenic sedimentation.

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Section: Age Populations In Pre-orogenic Samplesmentioning

confidence: 66%

Provenance constraints from detrital zircon U–Pb ages in the NW Iberian Massif: implications for Palaeozoic plate configuration and Variscan evolution

Catalán

Fernández‐Suárez

Jenner

et al. 2004

JGS

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“…5; Keller et al l995;Cowie et al 1989;Remane et al 1999). Among these, only extinction and evolution events are unique KTB-defining criteria.…”

Section: Fig4mentioning

confidence: 99%

Deccan Volcanism Linked to the Cretaceous-Tertiary Boundary Mass Extinction: New Evidence from ONGC Wells in the Krishna-Godavari Basin

Keller

Bhowmick

Upadhyay

et al. 2011

Journal of the Geological Society of India

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A scientific challenge is to assess the role of Deccan volcanism in the Cretaceous-Tertiary boundary (KTB) mass extinction. Here we report on the stratigraphy and biologic effects of Deccan volcanism in eleven deep wells from the Krishna-Godavari (K-G) Basin, Andhra Pradesh, India. In these wells, two phases of Deccan volcanism record the world's largest and longest lava mega-flows interbedded in marine sediments in the K-G Basin about 1500 km from the main Deccan volcanic province. The main phase-2 eruptions (~80% of total Deccan Traps) began in C29r and ended at or near the KTB, an interval that spans planktic foraminiferal zones CF1-CF2 and most of the nannofossil Micula prinsii zone, and is correlative with the rapid global warming and subsequent cooling near the end of the Maastrichtian. The mass extinction began in phase-2 preceding the first of four mega-flows. Planktic foraminifera suffered a 50% drop in species richness. Survivors suffered another 50% drop after the first mega-flow, leaving just 7 to 8 survivor species. No recovery occurred between the next three mega-flows and the mass extinction was complete with the last phase-2 megaflow at the KTB. The mass extinction was likely the consequence of rapid and massive volcanic CO 2 and SO 2 gas emissions, leading to high continental weathering rates, global warming, cooling, acid rains, ocean acidification and a carbon crisis in the marine environment.Deccan volcanism phase-3 began in the early Danian near the C29R/C29n boundary correlative with the planktic foraminiferal zone P1a/P1b boundary and accounts for ~14% of the total volume of Deccan eruptions, including four of Earth's longest and largest mega-flows. No major faunal changes are observed in the intertrappeans of zone P1b, which suggests that environmental conditions remained tolerable, volcanic eruptions were less intense and/or separated by longer time intervals thus preventing runaway effects. Alternatively, early Danian assemblages evolved in adaptation to high-stress conditions in the aftermath of the mass extinction and therefore survived phase-3 volcanism. Full marine biotic recovery did not occur until after Deccan phase-3. These data suggest that the catastrophic effects of phase-2 Deccan volcanism upon the Cretaceous planktic foraminifera were a function of both the rapid and massive volcanic eruptions and the highly specialized faunal assemblages prone to extinction in a changing environment. Data from the K-G Basin indicates that Deccan phase-2 alone could have caused the KTB mass extinction and that impacts may have had secondary effects.

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“…Tuffs are also interbedded in the carbonaceous shales of the Prince Albert Formation and the overlying Whitehill Formation along the northern basin margin (McLachlan and Jonker 1990). Cowie and Bassett (1989) Most of the volcanogenic material identified in the aforementioned units is rhyodacitic and emplaced by air fall. A distant source for this volcanogenic material has been suggested (Elliot and Watts 1974;Coutinho et al 1991;Cole 1992).…”

Section: Volcanism Along the Continental Margin Reflected In The Saucmentioning

confidence: 99%

“…New radiometric dates on basement and volcanic rocks that indicate Permian metamorphism and magmatic activity, respectively, along the magmatic arc-backarc system of the Panthalassan margin. Cowie and Bassett (1989) The combination of the above sources helped to illustrate the paleotectonic evolution of these basins from an initial extensional phase to a subsequent foreland phase. The latter phase was characterized by cratonward thrusting and early increased subsidence (underfilled stage) followed by paleocurrent reversal and compositional changes associated with the uplift of the foldbelt/magmatic arc (overfilled stage).…”

Section: Introductionmentioning

confidence: 99%

Basin fill evolution and paleotectonic patterns along the Samfrau geosyncline: the Sauce Grande basinVentana foldbelt (Argentina) and Karoo basinCape foldbelt (South Africa) revisited

López-Gamundí¹,

Rossello

1998

Geologische Rundschau

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Stratigraphic Commission Accelerates Progress, 1984 to 1989

Cited by 133 publications

References 0 publications

Provenance constraints from detrital zircon U–Pb ages in the NW Iberian Massif: implications for Palaeozoic plate configuration and Variscan evolution

Provenance constraints from detrital zircon U–Pb ages in the NW Iberian Massif: implications for Palaeozoic plate configuration and Variscan evolution

Deccan Volcanism Linked to the Cretaceous-Tertiary Boundary Mass Extinction: New Evidence from ONGC Wells in the Krishna-Godavari Basin

Basin fill evolution and paleotectonic patterns along the Samfrau geosyncline: the Sauce Grande basinVentana foldbelt (Argentina) and Karoo basinCape foldbelt (South Africa) revisited

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Stratigraphic Commission Accelerates Progress, 1984 to 1989

Cited by 133 publications

References 0 publications

Provenance constraints from detrital zircon U–Pb ages in the NW Iberian Massif: implications for Palaeozoic plate configuration and Variscan evolution

Provenance constraints from detrital zircon U–Pb ages in the NW Iberian Massif: implications for Palaeozoic plate configuration and Variscan evolution

Deccan Volcanism Linked to the Cretaceous-Tertiary Boundary Mass Extinction: New Evidence from ONGC Wells in the Krishna-Godavari Basin

Basin fill evolution and paleotectonic patterns along the Samfrau geosyncline: the Sauce Grande basinVentana foldbelt (Argentina) and Karoo basinCape foldbelt (South Africa) revisited

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Basin fill evolution and paleotectonic patterns along the Samfrau geosyncline: the Sauce Grande basinVentana foldbelt (Argentina) and Karoo basinCape foldbelt (South Africa) revisited