Geochronological and geochemical investigations on plutonic rocks from the complex of Puerto Vallarta, Sierra Madre del Sur

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Published: Oct 1, 1988
DOI: https://doi.org/10.22201/igeof.00167169p.1988.27.4.809
Keywords:
Geochronology, geochemistry, plutonic rocks

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H. Köhler
Mineralogisch - Petrographisches Institut der Universität, Theresienstr. 41, D-8000 München 2, Germany
P. Schaaf
Mineralogisch - Petrographisches Institut der Universität, Theresienstr. 41, D-8000 München 2, Germany
D. Müller-Sohnius
Mineralogisch - Petrographisches Institut der Universität, Theresienstr. 41, D-8000 München 2, Germany
R. Emmermann
Institut für Geologie und Dynamik der Lithosphäre der Universität, Senckenbergstr. 3, D-6300 Giessen, Germany
J. F. W. Negendank
Abteinlung Geologie der Universität, Trier-Tarforst, D-5500 Trier, Germany
H. J. Tobschall
Institut für Geowissenschaften der Universität, Saarstr. 21, D-6500 Mainz, Germany

Abstract

Within the Sierra Madre del Sur nine intrusive complexes, varying in composition from trondjemitic to granitic, have been identified by Negendank et al. (1985). The age of the complexes, based on stratigraphic and to a limited extent on radiometric data, ranges from Jurassic to Cenozoic. In order to determine the age of intrusion and cooling of the granitoids of the complex of Puerto Vallarta and to shed some light on the origin of the respective melts Rb-Sr and K-Ar whole-rock and mineral measurements have been carried out. The results obtained are:
- The intrusion age of the granitoid is limited between 97 ± 3 Ma and 88 ± 2 Ma, the biotite cooling age is 83± 3 Ma for the Rb-Sr system. The hornblende cooling age is 86 ± 2 Ma for the K-Ar system.
- the cooling rate of the complex of Puerto Vallarta in the interval from about 100 Ma to about 80 Ma is approximately 35°C per 1 Ma.
- the granitoids have 87Sr/86Sr-initial ratios between 0. 704 and 0. 706, which indicate a possible mantle origin.
- basicfenoliths and the surrounding granitoids are derived from different sources.

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Köhler, H., Schaaf, P., Müller-Sohnius, D., Emmermann, R., Negendank, J. F. W., & Tobschall, H. J. (1988). Geochronological and geochemical investigations on plutonic rocks from the complex of Puerto Vallarta, Sierra Madre del Sur. Geofisica Internacional, 27(4), 519–542. https://doi.org/10.22201/igeof.00167169p.1988.27.4.809
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Vol. 27 No. 4 (1988): Octubre 1, 1988
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Author Biographies

H. Köhler, Mineralogisch - Petrographisches Institut der Universität, Theresienstr. 41, D-8000 München 2, Germany



D. Müller-Sohnius, Mineralogisch - Petrographisches Institut der Universität, Theresienstr. 41, D-8000 München 2, Germany



R. Emmermann, Institut für Geologie und Dynamik der Lithosphäre der Universität, Senckenbergstr. 3, D-6300 Giessen, Germany



J. F. W. Negendank, Abteinlung Geologie der Universität, Trier-Tarforst, D-5500 Trier, Germany



H. J. Tobschall, Institut für Geowissenschaften der Universität, Saarstr. 21, D-6500 Mainz, Germany



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