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Late Miocene coesite-eclogite exhumed in the Woodlark Rift

机译:伍德拉克裂谷发现了中新世晚辉辉岩榴辉岩

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摘要

Late Miocene–Pliocene eclogites were exhumed in the Woodlark Rift of eastern Papua New Guinea, an actively extending region west of the Woodlark Basin seafloor spreading center. We report the discovery of coesite in late Miocene eclogite from the lower plate of one of the D'Entrecasteaux Islands metamorphic core complexes within the Woodlark Rift. Zircon crystallization temperatures (650–675 °C) and 238U/206Pb age (ca. 8 Ma), and rutile thermometry (695–743 °C) combined with garnet-pyroxene thermometry (600–760 °C) and garnet-pyroxene-phengite barometry (18–27 kbar), indicate that the coesite-eclogite was exhumed from mantle depths (90 km) to the Earth's surface at plate tectonic rates (cm yr–1). This late Miocene coesite-eclogite is the youngest exhumed ultrahigh-pressure (UHP) rock on Earth, and its preservation ahead of the westward-propagating seafloor spreading center forces reevaluation of models for UHP exhumation, as well as the geologic and tectonic evolution of the Woodlark Rift.
机译:在巴布亚新几内亚东部的Woodlark 裂谷中发现了中新世-上新世晚期的榴辉岩,Woodlark 是Woodlark盆地海床扩散中心以西的活跃扩展区域。我们从Woodlark裂谷内的D'Entrecasteaux群岛变质核 复合体之一的下层 板中报告了 中新世榴辉岩中的堇青石的发现。锆石结晶温度 (650–675°C)和 238 U / 206 Pb年龄(约8 Ma),金红石 温度计(695–743°C)与石榴石-辉石 温度计(600–760°C)和石榴石-辉石-phengite 气压计(18–27 kbar),表明以板块构造速率(cm yr –1 )从地幔深度(90 km)到地球表面 sup>)。这块中新世晚辉岩-榴辉岩 是地球上最年轻的发掘出的超高压(UHP)岩石, 及其保存在向西传播的海底 扩散中心迫使重新评估UHP挖掘模型, 以及伍德拉克 Rift的地质和构造演化。

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  • 来源
    《Geology》 |2008年第9期|735-738|共4页
  • 作者单位

    Syracuse University, Department of Earth Sciences, Syracuse, New York 13244, USA;

    Syracuse University, Department of Earth Sciences, Syracuse, New York 13244, USA;

    Syracuse University, Department of Earth Sciences, Syracuse, New York 13244, USA;

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