Indian meteorite gives evidence on Earth’s formationDate: 13 October 2021 Tags: Space
Researchers have managed to find composition of Earth’s lower mantle by studying a meteorite sample obtained from India.
A meteor shower took place near the town of Katol in Maharashtra. Scientists had collected some fragments for studying.
Studies carried out initially showed that the host rock was mainly composed of olivine, an olive-green mineral.
Olivine is the most abundant mineral in Earth’s upper mantle. The upper mantle follows the crust. The upper mantle is then followed mantle and the inner core.
Scientists made use of a special microscopy technique to analyse a small sample. Laser micro-Raman spectrometer helped in determining mineralogy.
The crystal structure of the mineral was characterized to find out its mineralogy and texture.
Researchers discovered the first natural occurrence of a mineral called bridgmanite. The mineral was named after Nobel Prize winning Physicist, Prof. Percy W. Bridgman.
Various experimental studies have shown that bridgmanite makes up about 80% of the Earth’s lower mantle.
Significance of study
The exact composition of upper mantle will help in tracing the journey of the Earth from a sea of Magma to a rocky planet today.
Occurrence of natural bridgmanite will help in deciphering how they crystallized during the final stages of our Earth’s formation.
Bridgmanite of meteor
The mineral was formed due to a shock event of about 23 to 25 gigapascals. The mineral within Earth was formed over billions of years and the composition changes.
The mineral does not form overnight. It requires melting, re-crystallizing and melting event to get back to the current state.