Long-term cycles of Triassic climate change: A new δ18O record from conodont apatite

Julie Trotter, I.S. Williams, A. Nicora, M. Mazza, M. Rigo

    Research output: Contribution to journalArticle

    68 Citations (Scopus)

    Abstract

    © 2015. A new oxygen isotope (δ18O) record derived from conodont apatite reveals variable long-term climate trends throughout the Triassic period. This record shows several major, first order, negative shifts reflecting intense warming episodes, not only the well-known extreme PTB-Early Triassic event (5‰), but also two large cycles of similar magnitude (1.5, 1.7‰) and duration (7 Myrs) during the late Carnian and late Norian. Between the PTB-Early Triassic and Carnian major episodes, three rapid shorter-term warming events of decreasing magnitude punctuate the mid-late Anisian, early Ladinian, and latest Ladinian, with distinct cooler (i.e. favourable) intervals characterising the early Anisian and early Carnian, indicating a fluctuating but ameliorating Middle Triassic climate trend. Two long periods of sustained cooler conditions occurred during the Late Triassic, for much of the Norian and Rhaetian. The five humid events previously recognised from the geological record, including the Carnian Pluvial Episode, are associated with the low δ18O warming phases. The magnitudes of these first order warming cycles, together with widespread geological and palaeontological evidence, suggest they were at least Tethyan-wide events.
    Original languageEnglish
    Pages (from-to)165-174
    JournalEarth and Planetary Science Letters
    Volume415
    Early online date14 Feb 2015
    DOIs
    Publication statusPublished - 2015

    Fingerprint

    Oxygen Isotopes
    Apatites
    conodont
    climate change
    apatites
    Carnian
    Climate change
    new record
    apatite
    Triassic
    warming
    cycles
    heating
    Ladinian
    Anisian
    coolers
    Norian
    climate
    trends
    oxygen isotopes

    Cite this

    Trotter, Julie ; Williams, I.S. ; Nicora, A. ; Mazza, M. ; Rigo, M. / Long-term cycles of Triassic climate change: A new δ18O record from conodont apatite. In: Earth and Planetary Science Letters. 2015 ; Vol. 415. pp. 165-174.
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    abstract = "{\circledC} 2015. A new oxygen isotope (δ18O) record derived from conodont apatite reveals variable long-term climate trends throughout the Triassic period. This record shows several major, first order, negative shifts reflecting intense warming episodes, not only the well-known extreme PTB-Early Triassic event (5‰), but also two large cycles of similar magnitude (1.5, 1.7‰) and duration (7 Myrs) during the late Carnian and late Norian. Between the PTB-Early Triassic and Carnian major episodes, three rapid shorter-term warming events of decreasing magnitude punctuate the mid-late Anisian, early Ladinian, and latest Ladinian, with distinct cooler (i.e. favourable) intervals characterising the early Anisian and early Carnian, indicating a fluctuating but ameliorating Middle Triassic climate trend. Two long periods of sustained cooler conditions occurred during the Late Triassic, for much of the Norian and Rhaetian. The five humid events previously recognised from the geological record, including the Carnian Pluvial Episode, are associated with the low δ18O warming phases. The magnitudes of these first order warming cycles, together with widespread geological and palaeontological evidence, suggest they were at least Tethyan-wide events.",
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    Long-term cycles of Triassic climate change: A new δ18O record from conodont apatite. / Trotter, Julie; Williams, I.S.; Nicora, A.; Mazza, M.; Rigo, M.

    In: Earth and Planetary Science Letters, Vol. 415, 2015, p. 165-174.

    Research output: Contribution to journalArticle

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    AU - Trotter, Julie

    AU - Williams, I.S.

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    N2 - © 2015. A new oxygen isotope (δ18O) record derived from conodont apatite reveals variable long-term climate trends throughout the Triassic period. This record shows several major, first order, negative shifts reflecting intense warming episodes, not only the well-known extreme PTB-Early Triassic event (5‰), but also two large cycles of similar magnitude (1.5, 1.7‰) and duration (7 Myrs) during the late Carnian and late Norian. Between the PTB-Early Triassic and Carnian major episodes, three rapid shorter-term warming events of decreasing magnitude punctuate the mid-late Anisian, early Ladinian, and latest Ladinian, with distinct cooler (i.e. favourable) intervals characterising the early Anisian and early Carnian, indicating a fluctuating but ameliorating Middle Triassic climate trend. Two long periods of sustained cooler conditions occurred during the Late Triassic, for much of the Norian and Rhaetian. The five humid events previously recognised from the geological record, including the Carnian Pluvial Episode, are associated with the low δ18O warming phases. The magnitudes of these first order warming cycles, together with widespread geological and palaeontological evidence, suggest they were at least Tethyan-wide events.

    AB - © 2015. A new oxygen isotope (δ18O) record derived from conodont apatite reveals variable long-term climate trends throughout the Triassic period. This record shows several major, first order, negative shifts reflecting intense warming episodes, not only the well-known extreme PTB-Early Triassic event (5‰), but also two large cycles of similar magnitude (1.5, 1.7‰) and duration (7 Myrs) during the late Carnian and late Norian. Between the PTB-Early Triassic and Carnian major episodes, three rapid shorter-term warming events of decreasing magnitude punctuate the mid-late Anisian, early Ladinian, and latest Ladinian, with distinct cooler (i.e. favourable) intervals characterising the early Anisian and early Carnian, indicating a fluctuating but ameliorating Middle Triassic climate trend. Two long periods of sustained cooler conditions occurred during the Late Triassic, for much of the Norian and Rhaetian. The five humid events previously recognised from the geological record, including the Carnian Pluvial Episode, are associated with the low δ18O warming phases. The magnitudes of these first order warming cycles, together with widespread geological and palaeontological evidence, suggest they were at least Tethyan-wide events.

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