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Rapid crystallization of the Animikie Red Ace Pegmatite, Florence county, northeastern Wisconsin: inclusion microthermometry and conductive-cooling modeling

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Abstract

We evaluated the crystallization regime of a zoned pegmatite dike and the degree of magma undercooling at the onset of crystallization by analyzing coeval fluid and melt inclusion assemblages. The liquidus temperature of the pegmatite magma was ~720°C, based on re-melting of crystallized-melt inclusions in heating experiments. The magma crystallized sequentially starting with a thin border zone, which formed in less than one day at an average temperature of ~480°C based on primary fluid inclusions, meaning 240°C undercooling. The primary inclusions from the outer zones were postdated by secondary inclusions trapped between 580 and 720°C, representing fluid exsolved from hotter, still crystallizing inner pegmatite units. The huge temperature contrast between the pegmatite’s inner and outer zones was simulated by conductive-heat numerical modeling. A 2.5 m wide dike emplaced in 220°C rocks cools entirely to <400°C in less than 50 days. Unidirectional and skeletal textures also indicate rapid, disequilibrium crystallization.

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Acknowledgments

We thank Dave Jenkins, Bill Blackburn, and Tim Lowenstein at Binghamton University for support with hydrothermal experiments, EMPA analysis, and use of the microscopy lab. Phil Oshel at Central Michigan University (CMU) assisted with the SEM analyses. Two CMU Office of Research and Sponsored Programs grants to Sirbescu and undergraduate student Hartwick supported this project. Al Falster and the Wisconsin Department of Natural Resources are thanked for information about how to access and releasing access to the ARA pegmatite, respectively. The manuscript benefited from thoughtful comments and remarks from Jacques Touret and from thorough suggestions by an anonymous reviewer.

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  1. Emily E. Hartwick

    Present address: Wolverine Gas and Oil Corporation, 1 Riverfront Plaza, 55 Campau NW, Grand Rapids, MI, 49503, USA

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  1. Geology Department, Central Michigan University, 314 Brooks Hall, Mount Pleasant, MI, 48859, USA

    Mona-Liza C. Sirbescu, Emily E. Hartwick & James J. Student

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  1. Mona-Liza C. Sirbescu
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Correspondence to Mona-Liza C. Sirbescu.

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Communicated by T. L. Grove.

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Sirbescu, ML.C., Hartwick, E.E. & Student, J.J. Rapid crystallization of the Animikie Red Ace Pegmatite, Florence county, northeastern Wisconsin: inclusion microthermometry and conductive-cooling modeling. Contrib Mineral Petrol 156, 289–305 (2008). https://doi.org/10.1007/s00410-008-0286-0

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