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Shelf-valley compound fill produced by fault subsidence and eustatic sea-level changes, Eocene La Meseta Formation, Seymour Island, Antarctica

¹ Instytut Nauk Geologicznych PAN, Orodek Badawczy w Krakowie Senacka 1, 31-002 Kraków, Poland

Incised-valley compound fills are currently modeled in terms of multiple cycles of relative sea-level fall and rise. In contrast, the Eocene La Meseta Formation from Seymour Island is a shelf-valley geometrically compound fill, the development of which was governed mainly by local subsidence along fault-controlled valley margins and associated amplified tidal circulation. The valley contains a 330-m-thick, festoonlike stack of transgressive-regressive, marine-estuarine cycles affected by slumping and sliding, growth faulting, and warping near the margins. Aggradational stacking of the transgressive-regressive cycles reflects transgressions initiated or enhanced by episodic subsidence of the valley floor, whereas sequence boundaries record those base-level falls having rates that exceeded the rate of valley-floor subsidence. Compound fills, particularly those of shelf-valley systems developed along active basement structures, should not necessarily be attributable to regional base-level changes alone.

Key Words: shelf valley • estuary • tectonic accommodation • transgressive-regressive cycle • La Meseta Formation • Eocene

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