The Kola Superdeep Borehole keeps surprising geologists. The Conrad discontinuity expected near 7 km did not appear as a sharp boundary; the drill instead crossed a transition from igneous to metamorphic granite. At about 6 km, scientists found 24 species of fossil plankton in ancient rock. The video argues this means the crust once lay beneath a prehistoric sea; more directly, the fossils show that marine sediment became part of the crust. Deep fractures also held water, but the video’s claim that it was sealed since the rocks formed is not established by the evidence. By roughly 6 km, temperatures reached about 180°C—far above the 100°C forecast—and rose further toward the 12.26 km bottom reached in 1989, making the rock ductile and the borehole difficult to maintain.
Kola Superdeep Borehole revealed ancient microfossils and unexpectedly high heat
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📍 Kola Superdeep Borehole
Key facts
- KSDG-3 reached about 12,261 m in 1989.
- The predicted Conrad discontinuity near 7 km was not confirmed as a sharp boundary; the borehole instead crossed a transition from igneous granite to metamorphic granite.
- At about 6 km, 24 species of fossil plankton were found in ancient rocks. They show that marine sediment was incorporated into the crust, but do not prove that continental crust as a whole once lay beneath seas.
- Water-bearing fractures and fluid inclusions document water at depth, but the evidence does not establish that it was sealed there since the rocks formed. The video presents that stronger interpretation.
- The roughly 180°C temperature, compared with an expected approximately 100°C, occurred at about 6 km. Temperatures rose with depth toward an estimated 400°C near the bottom, making the rock ductile and the borehole difficult to maintain.
Sources
The World's Deepest Well - jstorjstor.org
At the so-called Conrad discontinuity the ve locity of seismic waves rises to six to seven kilometers per second; this has been taken to mark the transition to ...
Kola: The World's Deepest Hole Podcast Summary with Josh Clark ...shortform.com
The drilling also disproved the long-standing theory of the Conrad discontinuity—a hypothesized boundary between granite and basalt layers in ...
[PDF] Kola Superdeep - EarthDateearthdate.org
Scientists were searching … they expected to find a boundary between granite and basalt, known as the Conrad Discontinuity.
The nature of the Conrad discontinuity with respect to the results of ...researchgate.net
The nature of the Conrad discontinuity with respect to the results of kola superdeep well drilling and the data of a deep geoelectrical survey. March 2014 ...
Why Did the Russians Seal Up the Deepest Hole in the World?science.howstuffworks.com
The drilling project, initiated by the Soviets in 1970, revealed unexpected findings such as the absence of the "Conrad discontinuity" ...
Geodynamics in the cross-section of the Kola Superdeepcordis.europa.eu
The Kola Superdeep Borehole (KSDB-3) near Zapolyarny is the deepest borehole in the world (12261 m deep) and a treasure for the Earth sciences.
Visitor Guide to Kola Superdeep Borehole in Murmanskatlasobscura.com
Known to geologists as the "Conrad discontinuity," this transition in rock type was reasoned to exist due to the results of seismic-reflection ...
Kola Superdeepearthdate.org
... Conrad Discontinuity. Instead, they found a transition from igneous granite above to metamorphic granite below. This showed that continental crust is ...
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