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Serra Pelada: the first Amazonian Meteorite fall is a Eucrite (basalt) from Asteroid 4-Vesta
Maria Elizabeth Zucolotto1, Amanda A Tosi2, Caio V N Villaça2
1LABET/MN/UFRJ, Laboratório Extraterrestre, Departamento de Geologia e Paleontologia, Museu Nacional, Universidade Federal do Rio de Janeiro, Quinta da Boa Vista, São Cristóvão, 20940-040 Rio de Janeiro, RJ, Brazil.
Anais Da Academia Brasileira De Ciencias
|February 10, 2018
Summary
The Serra Pelada meteorite, a new Brazilian eucrite, shows brecciated textures and typical HED suite composition. Its mineralogy supports its origin from the asteroid 4 Vesta.
Area of Science:
- Planetary Science
- Meteoritics
- Cosmochemistry
Background:
- The Serra Pelada meteorite is a recent fall from Amazonia, Brazil.
- It represents a new data point for understanding eucrites and the HED (howardite-eucrite-diogenite) meteorite clan.
Purpose of the Study:
- To characterize the petrography, mineralogy, chemistry, and magnetic properties of the Serra Pelada meteorite.
- To determine its classification within the HED suite and infer details about its parent body.
Main Methods:
- Petrographic analysis of thin sections.
- Chemical analysis for elemental composition.
- Mineralogical investigation using microscopy and potentially spectroscopy.
- Magnetic property measurements.
Main Results:
- Serra Pelada is a brecciated, monomict basaltic eucritic breccia.
- Its mineralogy (low-Ca pyroxene, high-Ca plagioclase, accessory minerals) and chemistry are consistent with the HED suite.
- The meteorite likely originated from the crust of asteroid 4 Vesta.
Conclusions:
- Serra Pelada is a normal member of the HED suite, providing insights into asteroid 4 Vesta's crustal diversity.
- The study adds valuable geological and compositional data to the understanding of eucrites.
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