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Late-stage sinking of plutons

January 1, 1997

Many granodiorite to diorite plutons in the Great Basin of western North America are surrounded by rim monoclines or anticlines that suggest relative downward movement of the plutons while wall rocks were hot and ductile. We propose that such plutons rise to a level of approximately neutral buoyancy and then founder as their densities increase ≈10% during crystallization. Late-stage sinking of intermediate to mafic plutons should be common when wall rocks are rich in weak, low-density minerals such as quartz and calcite. Structures related to sinking will overprint those related to initial pluton emplacement and may be mistaken for regional tectonic structures.

Publication Year 1997
Title Late-stage sinking of plutons
DOI 10.1130/0091-7613(1997)025<1099:LSSOP>2.3.CO;2
Authors A. F. Glazner, D. M. Miller
Publication Type Article
Publication Subtype Journal Article
Series Title Geology
Index ID 70019303
Record Source USGS Publications Warehouse