Oxygen isotope constraints on the petrogenesis of the Sybille intrusion of the Proterozoic Laramie Anorthosite Complex
Article Abstract:
Research was conducted to examine the origin of the Sybille intrusion, one of the monzonitic bodies within the Laramie Anorthosite Complex, using a detailed oxygen isotope experiment. Results demonstrate that either a partial melt of lower crustal rocks or derivation from a basaltic magma of mantle origin with a metasedimentary component incorporated early in its magmatic history is in agreement with the data. The data are useful in understanding the genesis of anorthosites and associated monzonitic granitoids.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1999
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Syn-emplacement recrystallization and deformation microstructures in the Poe mountain anorthosite, Wyoming
Article Abstract:
Plagioclase recrystallization microstructures and petrofabrics in the unmetamorphosed Poe mountain anorthosite, Wyoming, indicates a high-temperature deformation and recrystallization at the time of the emplacement of the anorthosite body. The deformation and recrystallization of anorthosite was continuous from subliquidus to subsolidus temperature conditions during the intrusion. The deformation and recrystallization of the intrusion continued after the crystallization of the interstitial melt minerals.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1996
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High-Al gabbros in the Laramie Anorthosite Complex, Wyoming: implications for the composition of melts parental to Proterozoic anorthosite
Article Abstract:
Gabbros from different Proterozoic anorthosite complex are similar in composition to the high-Al gabbros of Laramie anorthosite complex (LAC), in southeastern Wyoming and are thought to be parental to their related anorthositic complex. LAC has high-Al gabbros, the presence of which indicates latest phases of magmatism in the 1.43 Ga LAC. The rock structure in this region is like dikes and small intrusions and they cross cut monozonitic and anorthositic rocks.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1995
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