The origin and petrologic evolution of the Ordovician Famatinian-Puna arc

Mihai N Ducea, J. E. Otamendi, G. W. Bergantz, D. Jianu, L. Petrescu

Research output: Chapter in Book/Report/Conference proceedingChapter

25 Citations (Scopus)

Abstract

Elemental chemistry, radiogenic isotopic data, and zircon U-Pb inheritance patterns for the Famatinian-Puna arc suggest that the primary petrogenetic process operating in the arc was mixing between subarc mantle-derived gabbroic magmas and metasedimentary materials without a substantial component of lower-crustal continental basement rocks. This mixing is observable in the field and evident in variations of chemical elemental parameters and isotopic ratios, revealing that hybridization coupled with fractionation of magmas took place in the upper 25 km of the crust. Intermediate and silicic plutonic rocks of the Famatinia-Puna arc formed in a subduction setting where the thermal and material input of mantle-derived magmas promoted fusion of fertile metasedimentary rocks and favored mixing of gabbroic and dioritic magmas with crustal granitic melts. Whole-rock geochemical and isotopic data for the Famatinian-Puna magmatic belt as a whole demonstrate that the petrologic model studied in detail in the Sierra Valle Fértil-La Huerta section has the potential to explain generation of plutonic and volcanic rocks across the Early Ordovician western Gondwanan proto-Pacific margin. This example further underscores the significance of passive-margin sedimentary accumulations in generating continental arcs.

Original languageEnglish (US)
Title of host publicationMemoir of the Geological Society of America
PublisherGeological Society of America
Pages125-138
Number of pages14
Volume212
ISBN (Print)9780813712123
DOIs
StatePublished - 2015

Publication series

NameMemoir of the Geological Society of America
Volume212
ISSN (Print)00721069

Fingerprint

Ordovician
plutonic rock
mantle
continental arc
metasedimentary rock
passive margin
basement rock
isotopic ratio
volcanic rock
zircon
subduction
fractionation
melt
crust
rock
material
chemical
parameter

ASJC Scopus subject areas

  • Geology

Cite this

Ducea, M. N., Otamendi, J. E., Bergantz, G. W., Jianu, D., & Petrescu, L. (2015). The origin and petrologic evolution of the Ordovician Famatinian-Puna arc. In Memoir of the Geological Society of America (Vol. 212, pp. 125-138). (Memoir of the Geological Society of America; Vol. 212). Geological Society of America. https://doi.org/10.1130/2015.1212(07)

The origin and petrologic evolution of the Ordovician Famatinian-Puna arc. / Ducea, Mihai N; Otamendi, J. E.; Bergantz, G. W.; Jianu, D.; Petrescu, L.

Memoir of the Geological Society of America. Vol. 212 Geological Society of America, 2015. p. 125-138 (Memoir of the Geological Society of America; Vol. 212).

Research output: Chapter in Book/Report/Conference proceedingChapter

Ducea, MN, Otamendi, JE, Bergantz, GW, Jianu, D & Petrescu, L 2015, The origin and petrologic evolution of the Ordovician Famatinian-Puna arc. in Memoir of the Geological Society of America. vol. 212, Memoir of the Geological Society of America, vol. 212, Geological Society of America, pp. 125-138. https://doi.org/10.1130/2015.1212(07)
Ducea MN, Otamendi JE, Bergantz GW, Jianu D, Petrescu L. The origin and petrologic evolution of the Ordovician Famatinian-Puna arc. In Memoir of the Geological Society of America. Vol. 212. Geological Society of America. 2015. p. 125-138. (Memoir of the Geological Society of America). https://doi.org/10.1130/2015.1212(07)
Ducea, Mihai N ; Otamendi, J. E. ; Bergantz, G. W. ; Jianu, D. ; Petrescu, L. / The origin and petrologic evolution of the Ordovician Famatinian-Puna arc. Memoir of the Geological Society of America. Vol. 212 Geological Society of America, 2015. pp. 125-138 (Memoir of the Geological Society of America).
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