暗长花岗岩变质与结晶的时间差(Córdoba，阿根廷)

IF 1.3 4区地球科学 Q2 GEOLOGY

Geologica Acta Pub Date : 2020-11-02 DOI:10.1344/geologicaacta2020.18.17

F. D. 'Eramo, J. J. Estéban, M. Demartis, E. Aragón, J. Coniglio, L. Pinotti

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引用次数: 3

摘要

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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Time lag between metamorphism and crystallization of anatectic granites (Córdoba, Argentina)

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.

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来源期刊

Geologica Acta 地学-地质学

CiteScore

2.50

自引率

6.70%

发文量

审稿时长

>12 weeks

期刊介绍： - Relevant conceptual developments in any area of the Earth Sciences. - Studies presenting regional synthesis. - Thematic issues or monographic volumes presenting the results from one or more research groups. - Short papers reflecting interesting results or works in progress. - Contributions and results from Research Projects, Workshops, Symposiums, Congresses and any relevant scientific activity related to Earth Sciences. - Geologica Acta aims to stimulate rapid diffusion of results and efficient exchange of ideas between the widespread communities of Earth Science researchers (with special emphasis on Latinamerica, the Caribbean, Europe, the Mediterranean