The Parent Body of a Pallasite Meteorite Based on Relationships among Texture & Mineralogy: Insights into Processes Took Place during Early Stages of the Solar System

Authors : Mahmood R. Sofe; Emad Y. Alashkham; Nuri A. Aleisawi

Volume/Issue : Volume 8 - 2023, Issue 1 - January

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Meteorites are the oldest rocks available for study and record processes that took place during the birth and early history of the Solar System. These rocks are derived from asteroids by cratering collisions, eventually crossing Earth′s orbit to land on the Earth’s surface. As a result and unlike terrestrial rocks, the meteorites demonstrate very diverse textures. The orbital relationships between meteorites and asteroids suggest that the interior of the asteroid belt is characterised by parent bodies with an abundance of chondrules. The petrographic study of a meteorite fall was carried out to identify its texture and petrographic sub-type. The meteorite fell in Al-Deyasser village west to Gharyan city, Libya (N: 32o 09 03" – E: 12 o 59 02") with total mass of about 100g. A polished thin section of the rock was studied using polarizing light microscope and SEM (scanning electron microscope), it illustrates mixture of chondrules, mm-sized silicate mineral ‘droplets’, olivine surrounded by a bright silver-colored iron-metal matrix, ~62 vol % of metals (~ Fe and Ni). In addition, carbonate and quartz occur as rare and small crystals within isolated pores that formed during aqueous alteration in the parent bodies of meteorite. Using RTB (Rose-Tschermak- Brezina) scheme the meteorite is being to be related to a sub-group of meteorites called the pallasite meteorites that are rare and very complex meteorites. These meteorites represent mixtures of core and mantle materials that lie on the core-mantle boundary in the interior of the Earth.

Keywords : meteorite; pallasite; carbonate minerals.


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