Middle Triassic paleomagnetic data from northern Bulgaria: constraints on Tethyan magnetostratigraphy and paleogeography

Muttoni, Giovanni; Gaetani, Maurizio; Budurov, Kiril; Zagorchev, Ivan; Trifonova, E. T.; Ivanova, Daria; Petrounova, Lyudmila; Lowrie, William

doi:10.1016/s0031-0182(00)00070-5

Cited by 42 publications

(32 citation statements)

References 16 publications

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“…Although there is a gap in the reversal record near the base of the Smithian (breccia and shale) at Guandao (Fig. 3), the two short reversals in the lower Smithian followed by a longer normal polarity zone in the upper Smithian and lower Spathian are similar to other sections and correspond to LT-4 through LT-6 (Muttoni et al, 2000;Hounslow and Muttoni, 2010).…”

Section: Paleomagnetic Reversal Stratigraphysupporting

confidence: 54%

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An integrated biostratigraphy (conodonts and foraminifers) and chronostratigraphy (paleomagnetic reversals, magnetic susceptibility, elemental chemistry, carbon isotopes and geochronology) for the Permian–Upper Triassic strata of Guandao section, Nanpanjiang Basin, south China

Lehrmann

Stepchinski

Altıner

et al. 2015

Journal of Asian Earth Sciences

109

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a b s t r a c tThe chronostratigraphy of Guandao section has served as the foundation for numerous studies of the end-Permian extinction and biotic recovery in south China. Guandao section is continuous from the Permian-Triassic boundary to the Upper Triassic.Conodonts enable broad delineation of stage and substage boundaries and calibration of foraminifer biostratigraphy as follows. Changhsingian-Griesbachian: first Hindeodus parvus, and first appearance of foraminifers Postcladella kalhori and Earlandia sp. Griesbachian-Dienerian: first Neospathodus dieneri, and last appearance of foraminifer P. grandis. Dienerian-Smithian: first Novispathodus waageni and late Dienerian first appearance of foraminifer Hoyenella ex gr. sinensis. Smithian-Spathian: first Nv? crassatus and last appearance of foraminifers Arenovidalina n. sp. and Glomospirella cf. vulgaris. Spathian-Aegean: first Chiosella timorensis and first appearance of foraminifer Meandrospira dinarica. Aegean-Bithynian: first Nicoraella germanica and first appearance of foraminifer Pilammina densa. Bithynian-Pelsonian: after last Neogondolella regalis, prior to first Paragondolella bulgarica and first appearance of foraminifer Aulotortus eotriasicus. Pelsonian-Illyrian: first Pg. excelsa and last appearance of foraminifers Meandrospira? deformata and Pilamminella grandis. Illyrian-Fassanian: first Budurovignathus truempyi, and first appearance of foraminifers Abriolina mediterranea and Paleolituonella meridionalis. FassanianLongobardian: first Bv. mungoensis and last appearance of foraminifer A. mediterranea. Longobardian-C ordevolian: first Quadralella polygnathiformis and last appearance of foraminifers Turriglomina mesotriasica and Endotriadella wirzi.The section contains primary magnetic signature with frequent reversals occurring around the Permian-Triassic, Olenekian-Anisian, and Anisian-Ladinian boundaries. Predominantly normal polarity occurs in the lower Smithian, Bithynian, and Longobardian-Cordevolian. Predominantly reversed polarity occurs in the upper Griesbachian, Induan-Olenekian, Pelsonian and lower Illyrian. Reversals match well with the GPTS. Large amplitude carbon isotope excursions, attaining values as low as À2.9‰ d 13 C and high as +5.7‰ d 13 C, characterize the Lower Triassic and basal Anisian. Values stabilize around +2‰ d 13 C through the Anisian to Carnian. Similar signatures have been reported globally. Magnetic susceptibility and synthetic gamma ray logs show large fluctuations in the Lower Triassic and an overall decline in magnitude of fluctuation through the Middle and Upper Triassic. The largest spikes in magnetic susceptibility and gamma ray, indicating greater terrestrial lithogenic flux, correspond to positive d 13 C excursions. High precision U-Pb analysis of zircons from volcanic ash beds provide a robust age of 247.28 ± 0.12 Ma for the Olenekian-Anisian boundary at Guandao and an age of 251.985 ± 0.097 Ma for the Permian-Triassic boundary at Taiping. Together, the new U-Pb geochronology from the Guandao and Taiping sectio...

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Section: Paleomagnetic Reversal Stratigraphysupporting

confidence: 54%

“…3). This corresponds to the pattern in the GPTS (UT-1, 2; Muttoni et al, 2000;Hounslow and Muttoni, 2010).…”

Section: Paleomagnetic Reversal Stratigraphymentioning

confidence: 56%

An integrated biostratigraphy (conodonts and foraminifers) and chronostratigraphy (paleomagnetic reversals, magnetic susceptibility, elemental chemistry, carbon isotopes and geochronology) for the Permian–Upper Triassic strata of Guandao section, Nanpanjiang Basin, south China

Lehrmann

Stepchinski

Altıner

et al. 2015

Journal of Asian Earth Sciences

109

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“…For the Triassic there has been much progress made in calibrating the pattern of reverse and normal magnetic fi eld polarity changes against conodont biostratigraphies (Muttoni et al, 1996(Muttoni et al, , 2000(Muttoni et al, , 2004Gallet et al, 2000;Channell et al, 2003). These studies have predominantly used Tethyan carbonate-dominated marine successions.…”

Section: Introductionmentioning

confidence: 99%

Biomagnetostratigraphy of the Vikinghogda Formation, Svalbard (Arctic Norway), and the geomagnetic polarity timescale for the Lower Triassic

Hounslow

Peters

Mørk

et al. 2008

Geological Society of America Bulletin

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A biomagnetostratigraphy for the Lower Triassic is constructed, using the ammonoid biostratigraphy from Arctic Boreal successions. Combined thermal and alternating fi eld demagnetization determines the Triassic magnetic fi eld polarity in 86% of specimens, with 36% showing linear trajectory line fi ts and the remainder showing great-circle trends toward the characteristic magnetization. Mean pole directions for the Deltadalen (λ = 50°, ϕ = 159°, dp/dm = 3.9°/5.1°), Lusitaniadalen (λ = 56°, ϕ = 163°, dp/dm = 4.4°/5.4°), and Vendomdalen (λ = 57°, ϕ = 143°, dp/dm = 4.4°/5.4°) members fall close to the European Lower Triassic apparent polar wander path. Mean directions for two of these membermeans pass the reversal test. The remanence is predominantly carried by magnetite. The polarity stratigraphy, when integrated with the ammonoid and meager conodont data, is similar to that determined from successions in the Sverdrup Basin (Canada). The Permian-Triassic boundary post-dates a pronounced palynofl oral turnover and predates a short duration reverse magnetozone (LT1n.1r). In the correlated Shangsi section (in South China), LT1n.1r occurs after the fi rst appearance datum (FAD) of H. parvus, but in the Arctic is within the Otoceras boreale Zone. The late Griesbachian to early Smithian is mostly reverse polarity, with three normal-polarity intervals, overlain by mid and late Smithian normal polarity. The Spathian contains four reverse-polarity intervals, the oldest one within the early Spathian with the remainder in the late Spathian. The transition into the Anisian is within the uppermost reverse magnetozone, a feature documented in other sections of this age. The polarity pattern is correlated to other marine sections, indicating the robustness of the biomagnetostratigraphic composite and its utility in calibrating Lower Triassic time.

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“…(BU5245) formed part of Prof. Kiril Budurov's extensive microvertebrate collection acquired during the course of his work on the Triassic conodont biostratigraphy of the Tethys province (Budurov and Stefanov, 1972, 1973, 1974, 1975Budurov, 1977;Sudar and Budurov, 1979;Budurov, 1980). The above-mentioned material comes from three separate samples ( refer to Chatalov and Doneva (2009) for sedimentological description, and Stefanov (1977) and Muttoni et al (2000) for details about the litho-, magneto-, and biostratigraphy of the strata cropping out at the sites. The information accompanying the specimens allowed tracing their provenance to the Anisian sediments of the Babino Formation (Tronkov, 1973), belonging to the Balkanide-type Middle Triassic sequences of the Iskar Carbonate Group (Tronkov, 1981).…”

Section: Methodsmentioning

confidence: 99%

“…Type Locality-Quarries Section (Stefanov, 1977;Muttoni, et al, 2000), 1 km north of the town of Belogradchik (Vidin Province, NW Bulgaria) along the Belogradchik-Gara Oreshets tertiary road.…”

Section: Etymology-from 'Rhomaleos' (Robust In Ancientmentioning

confidence: 99%

New Triassic stem selachimorphs (Chondrichthyes, Elasmobranchii) and their bearing on the evolution of dental enameloid in Neoselachii

Andreev

Cuny

2012

Journal of Vertebrate Paleontology

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Middle Triassic paleomagnetic data from northern Bulgaria: constraints on Tethyan magnetostratigraphy and paleogeography

Cited by 42 publications

References 16 publications

An integrated biostratigraphy (conodonts and foraminifers) and chronostratigraphy (paleomagnetic reversals, magnetic susceptibility, elemental chemistry, carbon isotopes and geochronology) for the Permian–Upper Triassic strata of Guandao section, Nanpanjiang Basin, south China

An integrated biostratigraphy (conodonts and foraminifers) and chronostratigraphy (paleomagnetic reversals, magnetic susceptibility, elemental chemistry, carbon isotopes and geochronology) for the Permian–Upper Triassic strata of Guandao section, Nanpanjiang Basin, south China

Biomagnetostratigraphy of the Vikinghogda Formation, Svalbard (Arctic Norway), and the geomagnetic polarity timescale for the Lower Triassic

New Triassic stem selachimorphs (Chondrichthyes, Elasmobranchii) and their bearing on the evolution of dental enameloid in Neoselachii

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