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- W2084669759 abstract "Jurassic pyroclastic rocks cap the Antarctic Gondwana sequence and document an important event in the evolution of the continent. The Hanson Formation, which crops out in the central Transantarctic Mountains, consists of ca 240 m of silicic tuffs, tuffaceous sandstones, and subordinate quartzose sandstones of probable Early Jurassic age. It is overlain by basaltic pyroclastic rocks of the Prebble Formation. Similar basaltic rocks also crop out in Victoria Land and constitute the Mawson and Exposure Hill Formations. These basaltic pyroclastic rocks and the overlying Kirkpatrick Basalt lavas are Middle Jurassic. The pyroclastic rocks comprise thick tuff-breccias with minor lapilli-tuffs and tuffs; sequences are as much as 400 m thick. These silicic and basaltic pyroclastic rocks record the transition from foreland basin fluvial sedimentation of the Antarctic Gondwana sequence to an extensional tectonic regime associated with flood basalts and Gondwana break-up. Les roches pyroclastiques jurassiques recouvrent la séquence gondwanienne de l'Antarctique et illustrent un événement important de l'évolution du continent. La Formation de Hanson qui affleure dans les Montagnes Transantarctiques centrales consiste en 240 m environ de tufs acides, de grès tufacés et, en faible quantité, de grès quartzeux d'âge jurassique inférieur probable. Elle est recouverte par les roches pyroclastiques basaltiques de la Formation de Prebble. Des roches basaltiques semblables affleurent également dans la Terre de Victoria et constituent les Formations de Mawson et d'Exposure Hill. Ces roches pyroclastiques basaltiques et les laves sus-jacentes des Basaltes de Kirkpatrick sont du Jurassique Moyen. Les roches pyroclastiques comprennent des brèches à tufs épaisses avec un peu de tufs de lapilli et de tufs; les séquences ont jusqu'à 400 m d'épaisseur. Ces roches pyroclastiques acides et basaltiques enregistrent la transition de la sédimentation de bassin fluviatile d'avant-pays de la séquence gondwanienne de l'Antarctique à un régime tectonique extensif associé aux basaltes des plateaux et à la dislocation du Gondwana." @default.
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- W2084669759 date "2000-07-01" @default.
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- W2084669759 title "Stratigraphy of Jurassic pyroclastic rocks in the Transantarctic Mountains" @default.
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