The Global boundary Stratotype Section and Point (GSSP) of the Ladinian Stage (Middle Triassic) at Bagolino (Southern Alps, Northern Italy) and its implications for the Triassic time scale

Brack, Peter; Rieber, Hans; Nicora, Alda; Mundil, Roland

doi:10.18814/epiiugs/2005/v28i4/001

Cited by 148 publications

(99 citation statements)

References 27 publications

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“…Our assignment of the "Black Ledge" sandstone to the Glen Canyon Group (Fig. 3) rather than to the underlying Chinle Group or Formation is supported by a "Black Ledge" statistical age peak (seven grains) of 203 Ma, which is younger than the Chinle depositional age of Carnian-Norian (Brack et al, 2005).…”

Section: Fluvial Zircon Provenancementioning

confidence: 58%

U-Pb ages of detrital zircons in Jurassic eolian and associated sandstones of the Colorado Plateau: Evidence for transcontinental dispersal and intraregional recycling of sediment

Dickinson

Gehrels

2009

Geological Society of America Bulletin

270

203

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U-Pb ages for 1655 individual detrital zircon grains in 18 samples of eolian and associated marine and fl uvial sandstones of the Glen Canyon and San Rafael Groups from the Colorado Plateau and contiguous areas shed light on patterns of Jurassic sediment dispersal within Laurentia. Most detrital zircon grains in Jurassic eolianites were derived ultimately from basement provinces older than 285 Ma in eastern and central Laurentia, rather than from rock assemblages of the nearby Cordilleran margin. The most prominent peaks of constituent age populations at 420 Ma, 615 Ma, 1055 Ma, and 1160 Ma refl ect derivation from Paleozoic, Neoproterozoic, and Grenvillian sources within the Appalachian orogen or its sedimentary cover. Sediment was transported to a position upwind to the north of the Colorado Plateau by a transcontinental paleoriver system with headwaters in the central to southern Appalachian region, but subordinate non-Appalachian detritus was contributed by both northern and southern tributaries during sediment transit across the continent. Subordinate detrital zircons younger than 285 Ma in selected Middle to Upper Jurassic eolianites were derived from the Permian-Triassic East Mexico and the MesozoicCordilleran magmatic arcs. Lower Jurassic fl uvial sandstones typically contain a mixture of detrital zircons redistributed from eolian sand and derived from the East Mexico arc, which lay up-current to the southeast. Zircons in marine Curtis sandstone were largely reworked from underlying Entrada eolianite, with minor contributions from the Jurassic backarc igneous assemblage of the Great Basin. Once mature quartzose detritus was dispersed widely across southwest Laurentia by a transcontinental paleoriver system and paleowinds, which deposited extensive Jurassic ergs, durable zircon grains were recycled by multiple intraregional depositional systems. Lower Jurassic fl uvial sand is locally composed, however, of detritus derived from the nearby Cordilleran magmatic arc assemblage and its Precambrian basement.

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Section: Fluvial Zircon Provenancementioning

confidence: 58%

U-Pb ages of detrital zircons in Jurassic eolian and associated sandstones of the Colorado Plateau: Evidence for transcontinental dispersal and intraregional recycling of sediment

Dickinson

Gehrels

2009

Geological Society of America Bulletin

270

203

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“…The GSSP of the Anisian -Ladinian boundary (ALB) is defined at the appearance of the ammonoid Eoprotrachyceras curionii in the Caffaro River bed near Bagolino in the Italian Dolomites (Brack et al 2005). The appearance of the conodont Budurovignathus praehungaricus (Kovacs) near the top of the underlying Nevadites secedensis Zone provides a proxy for the ALB.…”

Section: Anisian -Ladinian Boundary (Figs 8 and 9)mentioning

confidence: 99%

“…Numerical scale afterBrack et al 2005, Lehrmann et al 2006, Ovtcharova et al 2006, Galfetti et al 2007, Kozur & Bachmann 2008and Schaltegger et al 2008.…”

mentioning

confidence: 99%

Triassic conodonts and their role in stage boundary definition

Orchard

2010

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Conodonts have played an important role in the construction of a Triassic timescale. Each of the stage boundaries is reviewed in the context of their evolving conodont faunas. The base Triassic (Induan) is defined by the appearance of Hindeodus parvus, which developed from H. praeparvus; a parallel zonation is provided by Neogondolella species. For the Induan-Olenekian boundary, the appearance of Neospathodus waageni sensu lato within a plexus of similar species is favoured as the defining datum; Borinella and Eurygnathodus also appear about this time. The base of the Middle Triassic Anisian stage lies close to the appearance of Chiosella, with Triassospathodus and Spathicuspus characterizing the late Olenekian, and Gladigondolella tethydis and Nicoraella confined to the Anisian. Proxies for the Anisian-Ladinian boundary, which is defined by an ammonoid, are the first Budurovignathus species. The basal Carnian, also defined by an ammonoid, lies close to the first metapolygnathids, including M. polygnathiformis and M. tadpole. The Carnian-Norian boundary interval is characterized by many new taxa in Canada, but only a few species are common to Tethys, notably Metapolygnathus ex gr. M. echinatus.

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“…2002), as well as from Liechtenstein,westem Austria (BRÜHW1LER et al, 2007) and Hungary where it has been designated as meieri -scheuringii phase {GÓCZÁN & ORAVECZ-SCHEFFER, 1993;KOVÁCS et al,, 1994). The secatus -dimorphus phase concours with the ammonoid gredleri zone and archelaus zone ( VAN DER EEM, 1983;BRUGMAN, 1986), which, according to BRACK et al (2005), are Late Fassanian-Early Langobardian in age. Among the stratigraphically significant sporomorphs that are shared between the secatus -dimorphus phase and the palynoflora of sample Pal-6, Heliosaccus dimorphus has a range within the secatus -dimorphus phase whilst Camerosporites secatus, Duplicisporites gran- …”

Section: Pa Lyn O Stratigraphy Of the Zalo Unitmentioning

confidence: 99%

“…Afïer the acceptance of the GSSP for the base of the Ladinian stage at the base of the ammonoid ciirionii zone (BRACK et al, 2005), the pluríanulatus -novimundanns phase represents the latest Anisian palynofloral development. The/j/wrianiilatus -novinmndanus phase contains, in the lower part, the Late Anisian sporomorphs Stellapollenites ihiergartii and Dyupctahtm vicentinense.…”

Section: Ulatiis Sellaspora Ntgoverawata Kyrtomisporis Ervei Andmentioning

confidence: 99%

Geologic reconnaissance of the island of Velika Palagruža (central Adriatic, Croatia)

Korbar¹,

Montanari²,

Koch³

et al. 2009

Geol Cro

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Velika Palagruza (Pelagosa) is the largest island of the Palagru2a arehipelago (central Adriatic Sea, Croatia). Despite its minute size the island bears a certain geological interest being the only exposed piece of land in the central part (Mid-Adriatic ridge) of the common Adriatic foreland of the Apenninic and the Dinaridic orogenic domains. The litho-. bio-, and chemostratigraphic (strontium and sulphur isotopes) characteristics of the sedimentary units, along with tectono-stnictural and geomorphic characteristics of the island, are described in (his paper. The oldest ¿ato unit is composed of highly deformed siliciclastics containing gypsum, and carbonates of Middle Triassic (Ladinian) age. This unit represents a transitional fluvial-to-shallow marine, occasionally evaporitic environment, typical of the Middle Triassic rifting phase of the Adriatic microplate. Soft and strongly deformed Zalo unit deposits are found along a probably still active, WN W-ESE striking, subvertical, oblique-slip tault that crosses the entire length of the island. The Zalo unit is probably in diapiric contact with the Lantema unit, poorly defined as Late Triassic. and characterized by dolomite with chert and dolomite breccia, presumably deposited in a transitional plattbnn-to-basin environment of an evolving Adriatic basin. The Lantema unit deposits are capped by Miocene biocalcarenites of the Salamandrija unit over an almost perpendicular discordance, possibly representing an unconformity, suggesting that an early deformational phase preceded a Miocene marine transgression. Talus, landslide deposits, and humic soil make up the cover of the bedrock sedimentary succession, and they represent the ultimate phase of emersion of the island, which probably occurred during Pliocene(?) to Quaternary times. An active neotectonic regime of the central Adriatic is evidenced by present-day seismicity. while recent uplifting of the island is shown by the presence of remnanis of pebbly palaeobeach deposits, marine (erosional) straths, and cyanobacterial supratidal encrustations (pelagosite) currently observed at various elevations above mean sea level.

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The Global boundary Stratotype Section and Point (GSSP) of the Ladinian Stage (Middle Triassic) at Bagolino (Southern Alps, Northern Italy) and its implications for the Triassic time scale

Cited by 148 publications

References 27 publications

U-Pb ages of detrital zircons in Jurassic eolian and associated sandstones of the Colorado Plateau: Evidence for transcontinental dispersal and intraregional recycling of sediment

U-Pb ages of detrital zircons in Jurassic eolian and associated sandstones of the Colorado Plateau: Evidence for transcontinental dispersal and intraregional recycling of sediment

Triassic conodonts and their role in stage boundary definition

Geologic reconnaissance of the island of Velika Palagruža (central Adriatic, Croatia)

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