Geosciences 2013, 3(3), 585-615; doi:10.3390/geosciences3030585
Article

Evaluating Complex Magma Mixing via Polytopic Vector Analysis (PVA) in the Papagayo Tuff, Northern Costa Rica: Processes that Form Continental Crust

1 Department of Natural and Applied Sciences, Bentley University, Waltham, MA 02452, USA 2 National Science Foundation, Arlington, VA 22230, USA 3 Department of Geological Sciences, Michigan State University, East Lansing, MI 48824, USA 4 Seismology and Volcanology Department, Costa Rica Institute of Electricity, Apdo. 10032-1000, San José, Costa Rica
* Author to whom correspondence should be addressed.
Received: 4 July 2013; in revised form: 19 August 2013 / Accepted: 23 August 2013 / Published: 29 August 2013
(This article belongs to the Special Issue Continental Accretion and Evolution)
PDF Full-text Download PDF Full-Text [2183 KB, Updated Version, uploaded 2 September 2013 14:29 CEST]
The original version is still available [2146 KB, uploaded 29 August 2013 13:36 CEST]
Abstract: Over the last forty years, research has revealed the importance of magma mixing as a trigger for volcanic eruptions, as well as its role in creating the diversity of magma compositions in arcs. Sensitive isotopic and microchemical techniques can reveal subtle evidence of magma mixing in igneous rocks, but more robust statistical techniques for bulk chemical data can help evaluate complex mixing relationships. Polytopic vector analysis (PVA) is a multivariate technique that can be used to evaluate suites of samples that are produced by mixing of two or more magma batches. The Papagayo Tuff of the Miocene-Pleistocene Bagaces Formation in northern Costa Rica is associated with a segment of the Central American Volcanic Arc. While this segment of the arc is located on oceanic plateau, recent (<8 Ma) ignimbrites bear the chemical signatures of upper continental crust, marking the transition from oceanic to continental crust. The Papagayo Tuff contains banded pumice fragments consistent with one or more episodes of mixing/mingling to produce a single volcanic deposit. The PVA solution for the sample set is consistent with observations from bulk chemistry, microchemistry and petrographic data from the rocks. However, without PVA, the unequivocal identification of the three end-member solution would not have been possible.
Keywords: Papagayo Tuff; Bagaces Formation; Central American Volcanic Arc; magma mixing; magma mingling; microchemistry; polytopic vector analysis; continental crust

Supplementary Files

Article Statistics

Load and display the download statistics.

Citations to this Article

Cite This Article

MDPI and ACS Style

Szymanski, D.W.; Patino, L.C.; Vogel, T.A.; Alvarado, G.E. Evaluating Complex Magma Mixing via Polytopic Vector Analysis (PVA) in the Papagayo Tuff, Northern Costa Rica: Processes that Form Continental Crust. Geosciences 2013, 3, 585-615.

AMA Style

Szymanski DW, Patino LC, Vogel TA, Alvarado GE. Evaluating Complex Magma Mixing via Polytopic Vector Analysis (PVA) in the Papagayo Tuff, Northern Costa Rica: Processes that Form Continental Crust. Geosciences. 2013; 3(3):585-615.

Chicago/Turabian Style

Szymanski, David W.; Patino, Lina C.; Vogel, Thomas A.; Alvarado, Guillermo E. 2013. "Evaluating Complex Magma Mixing via Polytopic Vector Analysis (PVA) in the Papagayo Tuff, Northern Costa Rica: Processes that Form Continental Crust." Geosciences 3, no. 3: 585-615.

Geosciences EISSN 2076-3263 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert