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Publications

Results from our Program’s research and minerals information activities are published in USGS publications series as well as in outside journals.  To follow Minerals Information Periodicals, subscribe to the Mineral Periodicals RSS feed.

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Fluorspar Fluorspar

The U.S. produced 50 kt of fluorspar in 1992 and imported nearly 409 kt. Almost all the fluorspar was imported from China. The U.S. consumption of 467 kt represents the lowest level since 1958. This is due to the continuing decrease in consumption by the steel and aluminum industries.
Authors
M. Miller

Geologic studies in Alaska by the U.S. Geological Survey, 1992 Geologic studies in Alaska by the U.S. Geological Survey, 1992

This collection of 19 papers continues the annual series of U.S. Geological Survey reports on the geology of Alaska. The contributions, which include full-length Articles and shorter Geologic Notes, cover a broad range of topics including dune formation, stratigraphy, paleontology, isotopic dating, mineral resources, and tectonics. Articles, grouped under four regional headings, span...

530 Ma zircon age for ophiolite from the New England orogen: Oldest rocks known from eastern Australia 530 Ma zircon age for ophiolite from the New England orogen: Oldest rocks known from eastern Australia

New ion microprobe data provide constraints on the timing of formation of ophiolitic rocks in the New England tectonic collage in eastern Australia. Results for analyses of magmatic zircons from plagiogranite of the Weraerai terrane ophiolite at Upper Bingara give a 206pb/238|j ag e Qf 53Q ± 6 Ma (2a). This plagiogranite is the oldest rock from eastern Australia yet identified. Existing...
Authors
J.C. Aitchinson, T. R. Ireland, M. Clark Blake, P.G. Flood

Kinematic evidence for extensional unroofing of the Franciscan Complex along the Coast Range Fault, Northern Diablo Range, California Kinematic evidence for extensional unroofing of the Franciscan Complex along the Coast Range Fault, Northern Diablo Range, California

Franciscan metagraywacke immediately below the Del Puerto ophiolite, an outlier of the Coast Range ophiolite in the northern Diablo Range, was sheared during top‐to‐the‐east displacement on the Coast Range fault. This represents normal faulting and extensional offset. It was accompanied by attenuation of the Coast Range ophiolite and Great Valley sequence in the hanging wall along layer...
Authors
T.A. Harms, A. S. Jayko, M. Clark Blake
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