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2020 NOVEMBER 2019 | VOLUME 29, NUMBER 11 SCIENCE

Subduction Polarity in Ancient Arcs: A Call to
4
Integrate Geology and Geophysics to Decipher
the Mesozoic Tectonic History of the Northern
GSA TODAY (ISSN 1052-5173 USPS 0456-530) prints news
Cordillera of North America
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CALENDAR and information for more than 22,000 GSA member readers Cover: Early Jurassic blueschist facies metamorphic rocks from
Terry L. Pavlis et al.
April is a combined issue). GSA TODAY is published by The
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GSA provides this and other forums for the presentation
along the forearc-accretionary complex boundary of the outermost
of diverse opinions and positions by scientists worldwide,
Early Jurassic arc in the Northern Cordillera. The outcrop shows
regardless of race, citizenship, gender, sexual orientation,
religion, or political viewpoint. Opinions presented in this
and mudstone protolith. The coeval development of the arc and subduction complex and later
publication do not reflect official positions of the Society. interlayered quartz and Fe- and Mg-rich pelite, interpreted as a chert
© 2019 The Geological Society of America Inc. All rights tectonic juxtaposition along the backstop of the Chugach accretionary complex indicate polarity
reserved. Copyright not claimed on content prepared of subduction was dipping east or north in present-day coordinates. Photo by Sarah Roeske.
wholly by U.S. government employees within the scope of See related article, p. 4–10.
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