F. D. 'Eramo, J. J. Estéban, M. Demartis, E. Aragón, J. Coniglio, L. Pinotti
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引用次数: 3
Abstract
SHRIMP and LA-ICP-MS analyses carried out on zircons from the Río de los Sauces granite revealed their metamorphic and igneous nature. The metamorphic zircons yielded an age of 537±4.8 (2σ)Ma that probably predates the onset of the anatexis during the Pampean orogeny. By contrast, the igneous zircons yielded a younger age of 529±6 (2σ)Ma and reflected its crystallization age. These data point to a short time lag of ca. 8Myr between the High Temperature (HT) metamorphic peak and the subsequent crystallization age of the granite. Concordia age of 534±3.8 (2σ)Ma, for both types of zircon populations, can be considered as the mean age of the Pampean HT metamorphism in the Sierras de Córdoba.
对Río de los花岗岩的锆石进行了SHRIMP和LA-ICP-MS分析，揭示了其变质和火成岩性质。变质锆石的年龄为537±4.8 (2σ)Ma，可能早于潘潘造山期深熔作用的开始。火成岩锆石年龄为529±6 (2σ)Ma，反映了其结晶年龄。这些数据表明，在高温变质峰和随后的花岗岩结晶年龄之间存在约8Myr的短时间滞后。两类锆石群的Concordia年龄均为534±3.8 (2σ)Ma，可作为sierra de Córdoba潘培亚期高温变质作用的平均年龄。
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