High-pressure/low-temperature metamorphism in the collision zone between the Chilenia and Cuyania microcontinents (western Precordillera, Argentina)
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- 作者：F.L. Boedoa ; florenciaboedo@gmail.com" class="auth_mail" title="E-mail the corresponding author ; A.P. Willnerb ; c ; arne.willner@rub.de" class="auth_mail" title="E-mail the corresponding author ; G.I. Vujovicha ; graciela@gl.fcen.uba.ar" class="auth_mail" title="E-mail the corresponding author ; H.-J. Massonneb ; h-j.massonne@imi.uni-stuttgart.de" class="auth_mail" title="E-mail the corresponding author
- 关键词：Peñ ; asco formation ; Mafic-ultramafic belt ; Devonian ; Greenschist facies ; Geothermobarometry ; Pseudosections ; Phengite
- 刊名：Journal of South American Earth Sciences
- 出版年：2016
- 出版时间：December 2016
- 年：2016
- 卷：72
- 期：Complete
- 页码：227-240
- 全文大小：3889 K
文摘
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We present first P-T estimates of southern Argentine Precordillera collisional belt.
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Metasedimentary and metabasaltic rocks reached conditions of 345–395 °C, 7.0–9.3 kbar.
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Metamorphic gradient (13 °C/km) is comparable with subduction-related gradients.
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Sedimentation was not contemporaneous with accretion as occur in accretionary prisms.
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The development of a collision zone supports the existence of Chilenia.