Jakarta, CNBC Indonesia – An island within the Indian Ocean holds a geological thriller that has thus far been unsolved. Researchers and native residents usually discover a sort of rock that needs to be inconceivable to search out on the island.
The mysterious island is Anjouan, which is situated within the Comoros Islands within the southeast of the African continent, north of Madagascar.
Anjouan was fashioned by tectonic shifts within the oceanic basin, which then precipitated clumps of magma that accrued and cooled to type basalt.
The discovering that has puzzled geologists is a kind of rock often known as quartzite (quarzit). Quartzite is fashioned by deposits of quartz sand downstream of rivers, which then solidify.
The issue, based on Stay Science, is that the soil in Anjouan doesn’t comprise quartz, however basalt, a black rock fashioned by magma.
The invention of quartzite in Anjouan has been reported for the reason that 1900s. In 1969, a bunch of geologists found sandstone formations on the island close to the city of Tsembehou. Upon investigation, the sandstone formation is quartzite.
In 2017, French geologist Patrique Bachelery discovered extra quartzite in a hill close to Tsembehou. A researcher from Columbia College named Cornelia Class was additionally curious and got here on to Anjouan. In only a matter of minutes, he discovered considerable quartzite at that location.
“It is the alternative [karakter] plate tectonics,” he mentioned. “Quartzite shouldn’t be discovered on volcanic islands.”
Native residents declare that they discover quartzite sort stones all over the place. The stone was utilized by them to sharpen knives.
After conducting a survey, Class and his group discovered that almost half of the volcanic space in Anjouan incorporates quartzite.
How quartzite acquired to Anjouan remains to be a thriller. One speculation is that quartzite from continental crust deposited in ocean basins was uplifted 4,000 meters to sea degree, when Anjouan fashioned.
Nonetheless, based on Class, the basalt rock at Anjouan proved to not have come from continental crust. Due to this fact, the invention is “one thing that we judged inconceivable, however we discovered it, as soon as we discovered it, we have now to discover a option to clarify it.”
Class’s first step, is to find out the age of the quartzite stone to find out when it was fashioned. Class hopes that this may open the veil of thriller why Anjouan is the one volcanic island that holds the stays of a continent that has sunk beneath it.
[Gambas:Video CNBC]
(dem)
