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Abstract

The Blue Dyke and Jardine Peak are subvertical hypabyssal intrusions cutting a stratiform volcanic sequence in the Admiralty Bay area on King George Island (South Shetlands, Antarctica ). The rocks are porphyritic, crystal-rich basaltic andesites. Tiny zircon crystals were used for single grain SHRIMP U-Pb dating. The mean ages calculated for the zircon populations from both intrusions indicates Late Oligocene (Chattian) formations. Zircon grains from the Blue Dyke gave the mean age of 27.9±0.3 Ma, whereas those from the Jardine Peak are slightly younger displaying the mean age of 25.4 ± 0.4 Ma: a Late Oligocene (Chattian) crystallization age the inferred of both these intrusions. These are much younger than previous Eocene K-Ar and Ar-Ar ages for such rocks and suggest that formation of the King George Island intrusions can be related to tectonic processes that accompanied the opening of the Drake Passage.

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Authors and Affiliations

Magdalena Pańczyk
Jerzy Nawrocki
Ian S. Williams
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Abstract

The matter of the accessibility of the human living environment and adapting it to (often highly diverse) user needs is not new, yet not all of its fields have had proper models and universal design guidelines prepared for them. Open learning and recreation zones that are accessible to all users and which correspond to their various needs are a sign of a new way of thinking about the role of urban spaces. This paper is intended to both familiarise readers with a model solution — Darrell’s Dream Boundless Playground and formulate guidelines that could aid in the construction of new, barrier-free spaces of this type.
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Authors and Affiliations

Paulina Tota
1

  1. Cracow University of Technology, Faculty of Architecture, Institute of Urban Design

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