Sapataparna Dasgupta, Bennett University
The explosive volcanoes in Indonesia are the most destructive ones in the world. The earth’s mantle offers new insights regarding the chemical composition of the minerals contained in the lava from Bali and Java. Thus, it can be inferred that based on the geographical location, the earth’s mantle provides new insights into the explosive volcanic eruptions and the magma. The author of this study, Frances Deegan, and a researcher at Uppsala University’s Department of Earth Sciences describes the results as that the composition of the mantle in Indonesia was not fully researched. Thus, it hindered the capability for the build-up of reliable models for the chemical changes that occur during the time of the eruption. As per the fact that magma forms in the mantle, which therefore gets erupted out, the knowledge of this mantle stands to be of utmost importance.
The Rise of Indonesia and Subsequent Disasters
The Earth’s mantle differs based on the geological environment, and thus impacts the type of volcanic eruption. In the past, it was created through these volcanic eruptions, and the tectonic plates collided against each other, thus the entire group of islands of Indonesia was formed. This wreck causes the Indo-Australian plate to slide under the Eurasian plate approximately 7 cm annually. This wrecking is the potential for causing devastating earthquakes, tsunamis, and explosive volcanoes in Indonesia.
Research on ‘Primary’ Magma
During the sliding of the tectonic plates, the water beneath the plates gets heated up and leads to the melting of rocks. As a result, it causes explosive volcanoes which leads to the formation of the arc-shaped groups of the islands of Indonesia. Along the extent of the Sunda Arc, several catastrophic volcanic eruptions have taken place. For example, Mount Tambora, Krakatoa, and Toba had destructive eruptions approximately 72,000 years ago. The research was conducted to find the composition of the ‘primary’ magma, geologists studied the minerals in lava that recently erupted out from the volcano.
The Study and Conclusion:
Using the ion beams from the secondary ion mass spectrometry (SIMS) the researchers studied the pyroxene crystals, a crystalline form of magma. The research was primarily based to determine the ratio of the oxygen isotopes 160 and 180, which discloses the evolutionary source of the magma. The researcher says that lava comprises 50% oxygen and the mantle of the Earth’s crust varies in the content of the oxygen isotope content. For the estimation of the amount of magma accumulated in the earth’s crust through the mantle, oxygen isotopes provide useful evidence of study. The research findings stated the composition was similar to that of the original state. However, a completely different pattern was found in the mineral samples collected from Java. Professor Valentin Toll, from Uppsala University’s Department of Earth Sciences, said that their team was able to “see that Merapi in Java exhibited an isotope signature very different from those of the volcanoes in Bali”. He further added that it was partly because of the intensive interaction of Merapi’s magma with the Earth’s crust before its eruption. They deemed it as greatly essential because when magma reacts with the limestone (calcium-carbonate) found in central Java right below the volcano, the “magma becomes full to bursting point with carbon dioxide and water”, as a result, making the eruptions much more explosive in nature. That is one of the primary reasons the scientists consider Merapi to be dangerous. It is considered to be one of the deadliest volcanoes in Indonesia, with a record of killing approximately 2,000 people in the last century. The most recent eruption itself took away 400 lives. The results thus, enhance the understanding regarding how the volcanism in the Indonesian group of islands work and have new land into existence.
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REFERENCE:
- Deegan, F.M., Whitehouse, M.J., Troll, V.R. et al. Sunda arc mantle source δ18O value revealed by intracrystal isotope analysis. Nat Commun 12, 3930 (2021). https://doi.org/10.1038/s41467-021-24143-3
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