BrainMap

Elena Negulescu

- INSTITUTUL GEOLOGIC AL ROMANIEI

Researcher

Expertise & keywords

The architecture of Romanian metamorphic basement units: a chronological insight from monazite electron microprobe chemical age determinations Call name: Exploratory Research Projects - PCE-2011 call
PN-II-ID-PCE-2011-3-0030 2011 - 2016

Role in this project:

Coordinating institution: Institutul de Cercetare-Dezvoltare în Domeniul Geologiei, Geochimiei şi Teledetecţiei (Institutul Geologic al României)

Project partners: Institutul de Cercetare-Dezvoltare în Domeniul Geologiei, Geochimiei şi Teledetecţiei (Institutul Geologic al României) (RO)

Affiliation: Institutul de Cercetare-Dezvoltare în Domeniul Geologiei, Geochimiei şi Teledetecţiei (Institutul Geologic al României) (RO)

Project website: http://www.igr.ro/proiecte/archimedes/

Abstract:

Metamorphic complexes exhumed to the surface of the Earth witness crustal-scale geodynamic events building the geostructural units of a particular territory. The metamorphic history is assessed by the recognizable assemblages, their succession and areal distribution. The time of mineral growth is recorded by the decay of radioactive isotopes incorporated in the minerals. The success in exerting chronological constraints on assemblages and textures depends on unambiguous identification of coeval radioactive minerals. Monazite represents the ideal candidate given its growth from low- to high-grade conditions, below the isotopic blocking temperature, abundant incorporation of radioactive elements, and chemical robustness. The project aims to systematic sampling of typical lithologies from units of the basement complexes in Romania, microscopic scrutiny of monazite setting in the metamorphic assemblages, and in situ monazite microprobe analyses on thin sections. The combined petrologic-chronologic approach would highlight the inner structure of the metamorphic complexes and the timing of their formation and evolution at unprecedented resolution, revealing events building metamorphic suites, spatial extension of particular domains within these, and means for a regional correlation among the metamorphic units, thereby tracking the chronology of dismembering and amalgamation episodes of basement and ultimately crustal fragments, all through the shaping of the present-day structure.

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