CA-TIMS zircon U–Pb dating of felsic ignimbrite from the Binchuan section: Implications for the termination age of Emeishan large igneous province

Zhong, Yu‐Wu; He, Bin; Mundil, Roland; Xu, Yi–Gang

doi:10.1016/j.lithos.2014.03.005

Cited by 198 publications

(100 citation statements)

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“…The age of the lower part of the Wujiaping Fm is not clear from the faunal data due to a barren 562 interval (Sun et al 2008). ID-TIMS U-Pb radiometric dates (260.4±0.8Ma; 259.1±0.9Ma), which appear 563 to be from reworked material from the Emeishan volcanics (Zhong et al 2014), suggest a maximum age, 564 but are consistent with the normal polarity interval in bed-7 being of late Capitanian age. The underlying 565…”

Section: Guadalupian Data From Marine Sections 537mentioning

confidence: 64%

A geomagnetic polarity timescale for the Permian, calibrated to stage boundaries

Hounslow

Balabanov

2016

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The reverse polarity Kiaman Superchron has strong evidence for at least three, or probably four, normal magnetochrons during the early Permian. Normal magnetochrons are during the early Asselian (base CI1r.1n at 297.94±0.33 Ma), late Artinskian (CI2n at 281.24±2.3 Ma), mid-Kungurian (CI3n at 275.86±2.0 Ma) and Roa"dian (CI3r.an at 269.54±1.6 Ma). The mixed-polarity Illawarra Superchron begins in the early Wordian at 266.66±0.76 Ma. The Wordian–Capitanian interval is biased to normal polarity, but the basal Wuchiapingian begins the beginning of a significant reverse polarity magnetochron LP0r, with an overlying mixed-polarity interval through the later Lopingian. No significant magnetostratigraphic data gaps exist in the Permian geomagnetic polarity record. The early Cisuralian magnetochrons are calibrated to a succession of fusulinid zones, the later Cisuralian and Guadalupian to a conodont and fusulinid biostratigraphy, and Lopingian magnetochrons to conodont zonations. Age calibration of the magnetochrons is obtained through a Bayesian approach using 35 radiometric dates, and 95% confidence intervals on the ages and chron durations are obtained. The dating control points are most numerous in the Gzhelian–Asselian, Wordian and Changhsingian intervals. This significant advance should provide a framework for better correlation and dating of the marine and non-marine Permian.

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Section: Guadalupian Data From Marine Sections 537mentioning

confidence: 64%

A geomagnetic polarity timescale for the Permian, calibrated to stage boundaries

Hounslow

Balabanov

2016

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“…This age is predicated upon the age of the GLB being isochronous with or shortly postdating the uppermost felsic ignimbrites of the central Emeishan LIP, for which an age of 259.1 + 0.5 Ma has recently been retrieved [12]. Combined with additional U-Pb CA-TIMS ages from intrusive rocks of the Emeishan LIP, this age indicates rapid emplacement between ca 260 Ma and 259.1 + 0.5 Ma [11,12] and suggests that the end-Tapinocephalus AZ extinctions may have coincided with the initial stages of volcanism within the Emeishan LIP, as has been done for the extinctions of at least some marine organisms [7,8].…”

Section: Discussionmentioning

confidence: 99%

“…However, extinction horizons have been identified for a number of Guadalupian invertebrate taxa at various biostratigraphic levels between the late Capitanian Jinogondolella prexuanhanensis/xuanhanensis Conodont Zone and the earliest Lopingian Clarkina postbitteri postbitteri Conodont Zone [6,7]. The ages of the marine extinctions therefore remain unclear but mostly appear to occur before the GLB, for which the current age estimate of 259.1 + 0.5 Ma is derived from links to the termination of volcanism in the Emeishan Large Igneous Province (LIP) [11,12].…”

Section: Introductionmentioning

confidence: 99%

When and how did the terrestrial mid-Permian mass extinction occur? Evidence from the tetrapod record of the Karoo Basin, South Africa

et al. 2015

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A mid-Permian (Guadalupian epoch) extinction event at approximately 260 Ma has been mooted for two decades. This is based primarily on invertebrate biostratigraphy of Guadalupian -Lopingian marine carbonate platforms in southern China, which are temporally constrained by correlation to the associated Emeishan Large Igneous Province (LIP). Despite attempts to identify a similar biodiversity crisis in the terrestrial realm, the low resolution of mid-Permian tetrapod biostratigraphy and a lack of robust geochronological constraints have until now hampered both the correlation and quantification of terrestrial extinctions. Here we present an extensive compilation of tetrapod-stratigraphic data analysed by the constrained optimization (CONOP) algorithm that reveals a significant extinction event among tetrapods within the lower Beaufort Group of the Karoo Basin, South Africa, in the latest Capitanian. Our fossil dataset reveals a 74 -80% loss of generic richness between the upper Tapinocephalus Assemblage Zone (AZ) and the mid-Pristerognathus AZ that is temporally constrained by a U-Pb zircon date (CA-TIMS method) of 260.259 + 0.081 Ma from a tuff near the top of the Tapinocephalus AZ. This strengthens the biochronology of the Permian Beaufort Group and supports the existence of a mid-Permian mass extinction event on land near the end of the Guadalupian. Our results permit a temporal association between the extinction of dinocephalian therapsids and the LIP volcanism at Emeishan, as well as the marine end-Guadalupian extinctions.

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“…This is an interpolated age between a top Wordian tie point age from USA and a mid-Wuchiapingian tie point age from China and there is no dated tuff bed close to this boundary (see Figure 24.10 of Gradstein et al 2012). A new high-precision CA-TIMS date of 259.1± 0.5 Ma for a felsic ignimbrite near the top of the Emeishan lava succession in SW China (Zhong et al, 2014) suggests that the age of the G-L boundary is close to this age. The International Commission on Stratigraphy's Permian Subcommission has now adopted this date for the G-L boundary (Angiolini, 2014).…”

Section: Capitanian-wuchiapingian (Guadalupian-lopingian) Boundarymentioning

confidence: 99%

High-precision U-Pb CA-TIMS calibration of Middle Permian to Lower Triassic sequences, mass extinction and extreme climate-change in eastern Australian Gondwana

et al. 2015

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CA-TIMS zircon U–Pb dating of felsic ignimbrite from the Binchuan section: Implications for the termination age of Emeishan large igneous province

Cited by 198 publications

References 50 publications

A geomagnetic polarity timescale for the Permian, calibrated to stage boundaries

A geomagnetic polarity timescale for the Permian, calibrated to stage boundaries

When and how did the terrestrial mid-Permian mass extinction occur? Evidence from the tetrapod record of the Karoo Basin, South Africa

High-precision U-Pb CA-TIMS calibration of Middle Permian to Lower Triassic sequences, mass extinction and extreme climate-change in eastern Australian Gondwana

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