Revised geochronology of magmatism in the western Capricorn Orogen at 1805-1785 Ma: diachroneity of the Pilbara-Yilgarn collision

D.A.D. Evans, Keith Sircombe, Michael Wingate, M. Doyle, M. Mccarthy, R.T. Pidgeon, H.S. Van Niekerk

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    Abstract

    The June Hill Volconics occupy a central stratigraphic position in the tectonic evolution of the Capricorn Orogeny that occurred along the southwestern margin of the Pilbara Craton in Palaeoproterozoic time. The volcanic rocks have been interpreted alternatively as due to continental rifting, foreland-basin development, or backarc extension. Previous multigrain zircon U-Pb results from these rocks, as well as from an unnamed rhyolitic porphyry that is interstratified in turbidites of the overlying Ashburton Formation, are influenced by the combined effects of Pb loss and xenocrystic inheritance. We report new SHRIMP zircon ages of 1799 8 and 1786 11 Ma, respectively from the June Hill Volcanics and the unnamed porphyry, both of which have been deformed during the Capricorn Orogeny. Close similarity between these ages and results from various late-stage Capricorn granitoids (including our new SHRIMP result of 1795 8 Ma for the Minnie Creek granite) imply rapid development of the western Ashburton Trough, accumulating and deforming similar to 10 km of turbiditic sediments in about 10 million years, Comparison of our new June Hill age with previous SHRIMP results from the central Ashburton Trough implies that foreland-basin development of the Capricorn Orogeny was significantly diachronous,younging westward during oblique Pilbara-Yilgarn convergence.
    Original languageEnglish
    Pages (from-to)853-864
    JournalAustralian Journal of Earth Sciences
    Volume50
    Issue number6
    DOIs
    Publication statusPublished - 2003

    Fingerprint

    geochronology
    orogeny
    magmatism
    collision
    foreland basin
    basin evolution
    porphyry
    trough
    zircon
    tectonic evolution
    rifting
    craton
    volcanic rock
    granite
    rock
    sediment
    comparison
    creek
    effect
    loss

    Cite this

    Evans, D.A.D. ; Sircombe, Keith ; Wingate, Michael ; Doyle, M. ; Mccarthy, M. ; Pidgeon, R.T. ; Van Niekerk, H.S. / Revised geochronology of magmatism in the western Capricorn Orogen at 1805-1785 Ma: diachroneity of the Pilbara-Yilgarn collision. In: Australian Journal of Earth Sciences. 2003 ; Vol. 50, No. 6. pp. 853-864.
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    title = "Revised geochronology of magmatism in the western Capricorn Orogen at 1805-1785 Ma: diachroneity of the Pilbara-Yilgarn collision",
    abstract = "The June Hill Volconics occupy a central stratigraphic position in the tectonic evolution of the Capricorn Orogeny that occurred along the southwestern margin of the Pilbara Craton in Palaeoproterozoic time. The volcanic rocks have been interpreted alternatively as due to continental rifting, foreland-basin development, or backarc extension. Previous multigrain zircon U-Pb results from these rocks, as well as from an unnamed rhyolitic porphyry that is interstratified in turbidites of the overlying Ashburton Formation, are influenced by the combined effects of Pb loss and xenocrystic inheritance. We report new SHRIMP zircon ages of 1799 8 and 1786 11 Ma, respectively from the June Hill Volcanics and the unnamed porphyry, both of which have been deformed during the Capricorn Orogeny. Close similarity between these ages and results from various late-stage Capricorn granitoids (including our new SHRIMP result of 1795 8 Ma for the Minnie Creek granite) imply rapid development of the western Ashburton Trough, accumulating and deforming similar to 10 km of turbiditic sediments in about 10 million years, Comparison of our new June Hill age with previous SHRIMP results from the central Ashburton Trough implies that foreland-basin development of the Capricorn Orogeny was significantly diachronous,younging westward during oblique Pilbara-Yilgarn convergence.",
    author = "D.A.D. Evans and Keith Sircombe and Michael Wingate and M. Doyle and M. Mccarthy and R.T. Pidgeon and {Van Niekerk}, H.S.",
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    language = "English",
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    Revised geochronology of magmatism in the western Capricorn Orogen at 1805-1785 Ma: diachroneity of the Pilbara-Yilgarn collision. / Evans, D.A.D.; Sircombe, Keith; Wingate, Michael; Doyle, M.; Mccarthy, M.; Pidgeon, R.T.; Van Niekerk, H.S.

    In: Australian Journal of Earth Sciences, Vol. 50, No. 6, 2003, p. 853-864.

    Research output: Contribution to journalArticle

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    AU - Evans, D.A.D.

    AU - Sircombe, Keith

    AU - Wingate, Michael

    AU - Doyle, M.

    AU - Mccarthy, M.

    AU - Pidgeon, R.T.

    AU - Van Niekerk, H.S.

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    N2 - The June Hill Volconics occupy a central stratigraphic position in the tectonic evolution of the Capricorn Orogeny that occurred along the southwestern margin of the Pilbara Craton in Palaeoproterozoic time. The volcanic rocks have been interpreted alternatively as due to continental rifting, foreland-basin development, or backarc extension. Previous multigrain zircon U-Pb results from these rocks, as well as from an unnamed rhyolitic porphyry that is interstratified in turbidites of the overlying Ashburton Formation, are influenced by the combined effects of Pb loss and xenocrystic inheritance. We report new SHRIMP zircon ages of 1799 8 and 1786 11 Ma, respectively from the June Hill Volcanics and the unnamed porphyry, both of which have been deformed during the Capricorn Orogeny. Close similarity between these ages and results from various late-stage Capricorn granitoids (including our new SHRIMP result of 1795 8 Ma for the Minnie Creek granite) imply rapid development of the western Ashburton Trough, accumulating and deforming similar to 10 km of turbiditic sediments in about 10 million years, Comparison of our new June Hill age with previous SHRIMP results from the central Ashburton Trough implies that foreland-basin development of the Capricorn Orogeny was significantly diachronous,younging westward during oblique Pilbara-Yilgarn convergence.

    AB - The June Hill Volconics occupy a central stratigraphic position in the tectonic evolution of the Capricorn Orogeny that occurred along the southwestern margin of the Pilbara Craton in Palaeoproterozoic time. The volcanic rocks have been interpreted alternatively as due to continental rifting, foreland-basin development, or backarc extension. Previous multigrain zircon U-Pb results from these rocks, as well as from an unnamed rhyolitic porphyry that is interstratified in turbidites of the overlying Ashburton Formation, are influenced by the combined effects of Pb loss and xenocrystic inheritance. We report new SHRIMP zircon ages of 1799 8 and 1786 11 Ma, respectively from the June Hill Volcanics and the unnamed porphyry, both of which have been deformed during the Capricorn Orogeny. Close similarity between these ages and results from various late-stage Capricorn granitoids (including our new SHRIMP result of 1795 8 Ma for the Minnie Creek granite) imply rapid development of the western Ashburton Trough, accumulating and deforming similar to 10 km of turbiditic sediments in about 10 million years, Comparison of our new June Hill age with previous SHRIMP results from the central Ashburton Trough implies that foreland-basin development of the Capricorn Orogeny was significantly diachronous,younging westward during oblique Pilbara-Yilgarn convergence.

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    ER -