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pyrometamorphism (py''-ro-met''-a-mor'-phism). (a) Metamorphic changes taking place without the action of pressure or water vapor, at temperatures near the melting points of the component minerals; it is a local, intense type of thermal metamorphism, resulting from the unusually high temperatures at the contact of a rock with magma, e.g. in xenoliths (Turner, 1948). Cf: igneous metamorphism. (b) "Metamorphism" caused by lightning strikes and burning coal seams.

Critical Minerals

By Lindsay Davis, GSA Science Policy Fellow

The legislative and executive branches are taking steps to decrease what President Trump calls a “strategic vulnerability” brought about by U.S. dependence on imports for certain non-fuel mineral commodities. These commodities, known as “critical minerals”, are vital to the U.S. economy, national defense, and other technology, and exist in limited quantities around the globe. According to a report published by the United States Geological Survey (USGS) on December 19, there are currently 23 critical minerals upon which the U.S. relies to support the military and technology development, many of which are imported either partially or exclusively from other countries, meaning their supply could be disrupted.

Cover of the report released by the USGS in 2017 on critical minerals. Credit: USGS.

S-type granitoid

S-type granitoid . A granitic rock produced by magma derived from partial fusion of metasedimentary or supracrustal origin. The term, proposed by Chappell and White in 1974, is thoroughly discussed by Clarke (1992).

AAG Snapshot: Service to Geography through the AAG

Have you ever considered being more involved in the American Association of Geographers? Are you looking to enhance your resume or CV with service experience? Consider volunteering for one of the many positions available for members of the AAG and help support the ongoing efforts of the Association in serving and representing our large community […]

Visiting Geographical Scientist Program Accepting Applications for 2018-19

The Visiting Geographical Scientist program (VGSP) is accepting applications for the 2018-19 academic year. VGSP sponsors visits by prominent geographers to small departments or institutions that do not have the resources to bring in well-known speakers. The purpose of this program is to stimulate interest in geography, targeted for students, faculty members, and administrative officers. Participating institutions […]

Paleontological Society to Sponsor Summer Policy Intern at AGI

Summer internships flyer

The American Geosciences Institute (AGI) and the Paleontological Society are excited to announce the creation of a new Geoscience Policy Summer Internship position at AGI. The intern, who must be a current student member of the Paleontological Society, will be an instrumental part of AGI's Geoscience Policy team based in the Washington, D.C., area.

oven-dry soil

oven-dry soil . Soil that has been dried at 105°C until it reaches constant mass.