期刊
ANTARCTIC SCIENCE
卷 24, 期 1, 页码 45-58出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0954102011000599
关键词
Anisotropy of magnetic susceptibility (AMS); Antarctic peninsula; Chon Aike silicic large igneous province; Gondwana break-up; regional extension; Trinity Peninsula Group
资金
- Czech Geological Survey
- Ministry of Environment of the Czech Republic [SPII1a9/23/07]
- Ministry of Education, Youth and Sports of the Czech Republic [MSM0021620855]
At Pitt Point, the east coast of Graham Land (Antarctic Peninsula), the Early to Middle Jurassic (Toarcian-Aalenian) rhyolite dykes form two coevally emplaced NNE-SSW and E-W trending sets. The nearly perpendicular dyke sets define a large-scale chocolate-tablet structure, implying biaxial principal extension in the WNW-ESE and N-S directions. Along the nearby north-eastern slope of Mount Reece, the WNW-ESE set locally dominates suggesting variations in the direction and amount of extension. Magnetic fabric in the dykes, revealed using the anisotropy of magnetic susceptibility (AMS) method, indicates dip-parallel to dip-oblique (?upward) magma flow. The dykes are interpreted as representing sub-volcanic feeder zones above a felsic magma source. The dyke emplacement was synchronous with the initial stages of the Weddell Sea opening during Gondwana break-up, but it remains unclear whether it was driven by regional stress field, local stress field above a larger plutonic body, or by an interaction of both.
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