Correlations between silicic volcanic rocks of the St Mary's Islands (southwestern India) and eastern Madagascar: implications for Late Cretaceous India-Madagascar reconstructions

Leone Melluso, Hetu C. Sheth, John J. Mahoney, Vincenzo Morra, Chiara M. Petrone, Michael Storey

    Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

    Resumé

    The St Mary's, Islands (southwestern India) expose silicic volcanic and sub-volcanic rocks (rhyolites and granophyric dacites) emplaced contemporaneously with the Cretaceous igneous province of Madagascar, roughly 88-90 Ma ago. I he St Mary's Islands rocks have phenocrysts of plagioclase, clinopyroxene, orthopyroxene and opaque oxide, Moderate enrichment in the incompatible elements, (e.g. Zr 580 720 ppm, Nb 43 53 ppan, La/Yb-a 0.9 7.2), relatively low initial Sr-87/Sr-86 (0.7052 0.7055) and near-chondritic initial Nd-143/Nd-144 (0.51248 0.51249), They have mineral chemical, whole-rock chemical and isotopic Compositions very close to those of rhyolites exposed between Vatomandry Ilaka and Mananjary in eastern Madagascar, and are distinctly different from rhyolites front other sectors of the Madagascan province. We therefore postulate that the St Mary's and the Vatomandry-Ilaka Mananjary silicic rock outcrops were adjacent before the Late Cretaceous rifting that split Madagascar from India, If so, they provide a valuable tool to check and aid traditional Cretaceous India Madagascar reconstructions based on palaeomagnetism, matching Precambrian geological features, and geometric fitting of continental shelves,
    OriginalsprogEngelsk
    TidsskriftJournal of the Geological Society - London
    Vol/bind166
    Udgave nummer2
    Sider (fra-til)283-294
    ISSN0016-7649
    DOI
    StatusUdgivet - 2009

    Citer dette

    Melluso, Leone ; Sheth, Hetu C. ; Mahoney, John J. ; Morra, Vincenzo ; Petrone, Chiara M. ; Storey, Michael. / Correlations between silicic volcanic rocks of the St Mary's Islands (southwestern India) and eastern Madagascar : implications for Late Cretaceous India-Madagascar reconstructions. I: Journal of the Geological Society - London. 2009 ; Bind 166, Nr. 2. s. 283-294.
    @article{49257aa0fa0f11de89af000ea68e967b,
    title = "Correlations between silicic volcanic rocks of the St Mary's Islands (southwestern India) and eastern Madagascar: implications for Late Cretaceous India-Madagascar reconstructions",
    abstract = "The St Mary's, Islands (southwestern India) expose silicic volcanic and sub-volcanic rocks (rhyolites and granophyric dacites) emplaced contemporaneously with the Cretaceous igneous province of Madagascar, roughly 88-90 Ma ago. I he St Mary's Islands rocks have phenocrysts of plagioclase, clinopyroxene, orthopyroxene and opaque oxide, Moderate enrichment in the incompatible elements, (e.g. Zr 580 720 ppm, Nb 43 53 ppan, La/Yb-a 0.9 7.2), relatively low initial Sr-87/Sr-86 (0.7052 0.7055) and near-chondritic initial Nd-143/Nd-144 (0.51248 0.51249), They have mineral chemical, whole-rock chemical and isotopic Compositions very close to those of rhyolites exposed between Vatomandry Ilaka and Mananjary in eastern Madagascar, and are distinctly different from rhyolites front other sectors of the Madagascan province. We therefore postulate that the St Mary's and the Vatomandry-Ilaka Mananjary silicic rock outcrops were adjacent before the Late Cretaceous rifting that split Madagascar from India, If so, they provide a valuable tool to check and aid traditional Cretaceous India Madagascar reconstructions based on palaeomagnetism, matching Precambrian geological features, and geometric fitting of continental shelves,",
    author = "Leone Melluso and Sheth, {Hetu C.} and Mahoney, {John J.} and Vincenzo Morra and Petrone, {Chiara M.} and Michael Storey",
    year = "2009",
    doi = "10.1144/0016-76492007-147",
    language = "English",
    volume = "166",
    pages = "283--294",
    journal = "Journal of the Geological Society",
    issn = "0016-7649",
    publisher = "Geological Society Publishing House",
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    Correlations between silicic volcanic rocks of the St Mary's Islands (southwestern India) and eastern Madagascar : implications for Late Cretaceous India-Madagascar reconstructions. / Melluso, Leone; Sheth, Hetu C.; Mahoney, John J.; Morra, Vincenzo; Petrone, Chiara M.; Storey, Michael.

    I: Journal of the Geological Society - London, Bind 166, Nr. 2, 2009, s. 283-294.

    Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

    TY - JOUR

    T1 - Correlations between silicic volcanic rocks of the St Mary's Islands (southwestern India) and eastern Madagascar

    T2 - implications for Late Cretaceous India-Madagascar reconstructions

    AU - Melluso, Leone

    AU - Sheth, Hetu C.

    AU - Mahoney, John J.

    AU - Morra, Vincenzo

    AU - Petrone, Chiara M.

    AU - Storey, Michael

    PY - 2009

    Y1 - 2009

    N2 - The St Mary's, Islands (southwestern India) expose silicic volcanic and sub-volcanic rocks (rhyolites and granophyric dacites) emplaced contemporaneously with the Cretaceous igneous province of Madagascar, roughly 88-90 Ma ago. I he St Mary's Islands rocks have phenocrysts of plagioclase, clinopyroxene, orthopyroxene and opaque oxide, Moderate enrichment in the incompatible elements, (e.g. Zr 580 720 ppm, Nb 43 53 ppan, La/Yb-a 0.9 7.2), relatively low initial Sr-87/Sr-86 (0.7052 0.7055) and near-chondritic initial Nd-143/Nd-144 (0.51248 0.51249), They have mineral chemical, whole-rock chemical and isotopic Compositions very close to those of rhyolites exposed between Vatomandry Ilaka and Mananjary in eastern Madagascar, and are distinctly different from rhyolites front other sectors of the Madagascan province. We therefore postulate that the St Mary's and the Vatomandry-Ilaka Mananjary silicic rock outcrops were adjacent before the Late Cretaceous rifting that split Madagascar from India, If so, they provide a valuable tool to check and aid traditional Cretaceous India Madagascar reconstructions based on palaeomagnetism, matching Precambrian geological features, and geometric fitting of continental shelves,

    AB - The St Mary's, Islands (southwestern India) expose silicic volcanic and sub-volcanic rocks (rhyolites and granophyric dacites) emplaced contemporaneously with the Cretaceous igneous province of Madagascar, roughly 88-90 Ma ago. I he St Mary's Islands rocks have phenocrysts of plagioclase, clinopyroxene, orthopyroxene and opaque oxide, Moderate enrichment in the incompatible elements, (e.g. Zr 580 720 ppm, Nb 43 53 ppan, La/Yb-a 0.9 7.2), relatively low initial Sr-87/Sr-86 (0.7052 0.7055) and near-chondritic initial Nd-143/Nd-144 (0.51248 0.51249), They have mineral chemical, whole-rock chemical and isotopic Compositions very close to those of rhyolites exposed between Vatomandry Ilaka and Mananjary in eastern Madagascar, and are distinctly different from rhyolites front other sectors of the Madagascan province. We therefore postulate that the St Mary's and the Vatomandry-Ilaka Mananjary silicic rock outcrops were adjacent before the Late Cretaceous rifting that split Madagascar from India, If so, they provide a valuable tool to check and aid traditional Cretaceous India Madagascar reconstructions based on palaeomagnetism, matching Precambrian geological features, and geometric fitting of continental shelves,

    U2 - 10.1144/0016-76492007-147

    DO - 10.1144/0016-76492007-147

    M3 - Journal article

    VL - 166

    SP - 283

    EP - 294

    JO - Journal of the Geological Society

    JF - Journal of the Geological Society

    SN - 0016-7649

    IS - 2

    ER -