International Journal of Earth Sciences

, Volume 99, Issue 4, pp 801–812 | Cite as

Magmatic erosion of the solidification front during reintrusion: the eastern margin of the Tuolumne batholith, Sierra Nevada, California

Original Paper

Abstract

The Tuolumne batholith, Sierra Nevada, California, consists of several nested granitoid units and is an example of upper-crustal normally zoned intrusions. The two outermost units of the batholith are separated by a wide gradational contact in what is interpreted to represent a large magma chamber. In the Potter Point area near the eastern margin of the batholith, the gradational contact is cross-cut by a network of interconnected mafic–felsic sheets, which grade into zones of magmatic erosion by stoping where the host granodiorite between the sheets was entirely removed and replaced by younger enclave-rich quartz diorite. We interpret these features to record disruption of a steep solidification front, which migrated inwards from the eastern batholith margin and separated the mushy to solidified margin from the remaining active magma chamber. When intersecting the gradational contact, the solidification front started to break up via a network of tectonically driven fractures accompanied by simultaneous injection of localized magma pulses. The solidification front break-up is interpreted here as an initial stage of a “recycling” process, whereby older magma mush is disrupted and incorporated into younger magma batches, a process we propose to have been widespread along internal contacts in the Tuolumne magma chamber.

Keywords

Granite Magma chamber Magmatic stoping Pluton Sierra Nevada Solidification front 

Notes

Acknowledgments

We gratefully acknowledge Antonio Castro and one anonymous reviewer for their constructive reviews, and Vojtěch Janoušek for discussions and amusing company in the field. This study was completed during post-doctoral research of Jiří Žák supported from post-doctoral grant of the Grant Agency of the Czech Republic No. 205/07/P226 (to Jiří Žák). We also acknowledge financial support from the Czech Academy of Sciences Grant No. KJB3111403 (to Jiří Žák), and the Ministry of Education, Youth and Sports of the Czech Republic Research Plan No. MSM0021620855. Paterson acknowledges support from NSF grants EAR-0212276 and EAR-0739651. Last but not least, the Yosemite National Park Rangers are gratefully acknowledged for their constant support and interest in our work.

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  1. 1.Faculty of Science, Institute of Geology and PaleontologyCharles UniversityPragueCzech Republic
  2. 2.PragueCzech Republic
  3. 3.Department of Earth SciencesUniversity of Southern CaliforniaLos AngelesUSA

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