Geology and tectosedimentary evolution of the Camp Hill Peninsula (Botany Bay), a key Jurassic locality of the Antarctic Peninsula
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Abstract
Geology and tectosedimentary evolution of the Camp Hill Peninsula (Botany Bay), a key Jurassic locality of the Antarctic Peninsula. The Camp Hill Peninsula exposes a thick Jurassic clastic sedimentary succession overlying the Late Paleozoic basement of the Trinity Peninsula Group and covered by volcanic and volcaniclastic rocks of the Middle-?Upper Jurassic Antarctic Peninsula Volcanic Group. The Camp Hill Formation was subdivided from base to top in the Dúo, Orca, La Pera and Cascada members. The E-younging monoclinal succession is cut by several E-W and NE-SW oriented faults. Sedimentation took place in well-vegetated alluvial fan, fluvial and lacustrine environments, within tectonically-controlled half grabens formed during a rifting period at the inception of the James Ross Basin. Volcanic and volcaniclastic beds were gradually incorporated in the Camp Hill Formation and finally covered this unit forming the Antarctic peninsula Volcanic Group composed both, by intrusive bodies like sills and dikes, and by effusive products like tuffs, agglomerates, breccias and coladas, of andesitic to latitic composition. E-W and ENE-WSW faults controlled the sedimentation and emplacement of eruptive centers starting in the Middle Jurassic. These faults were reactivated during the Early Cretaceous by N-S directed tectonic compression correlative with strong deformation in the Palmer Land. During the late Early Cretaceous, NE-SW strike-slip and reverse faulting uplitfted the Jurassic rocks that underwent erosion and formed the western margin of the James Ross Basin. Final uplift of the region took place during partial inversion of the basin and E-shift of depocenters during the Late Cretaceous and Cenozoic.
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