Цитата:
I propose that a similar process produced parallel sets of grooves in three geologic settings, as follows: (1) corrugated metamorphic core complexes where mylonitized mid-crustal rocks were exhumed by movement along low-angle normal faults known as detachment faults; (2) corrugated submarine surfaces where ultramafic and mafic rocks were exhumed by normal faulting within oceanic spreading centers; and (3) striated magma extrusions exemplified by the famous grooved outcrops at the Inca fortress of Sacsayhuaman in Peru. In each case, rocks inferred to have overlain the corrugated surface during corrugation genesis molded and shaped a plastic to partially molten rock mass as it was extruded from a moderate- to high-temperature reservoir.
http://geology.geoscienceworld.org/cgi/content/abstract/27/4/327
In 1978, the Geological Society of America Bulletin published
an article titled “The Extraordinary Striated Outcrop at Saqsaywaman,
Peru” by Tomas Feininger. In the article he explains how the outcrop
was formed. “The andesite reached the Earth’s surface along an
eruptive fissure. The first materials ejected were hot but solid blocks,
which built an elongated, steep-sided mound. Later, viscous lava was
extruded though the crest of the mound and flowed down its flanks.
The stretching of the lava during floage caused its surface to become
striated, analogous to the striations on the surface of pulled taffy.” In
geological terms this outcrop is also referred to as a mullion structure,
which is defined as “consisting of a series of parallel columns
composed of folded bedrock”.
In 2002, three geologists, Steve Mabee, Don Weise and Ken
Hardcastle, accompanied me to this site. After examining the outcrop
they agreed with Feininger’s explanation of how it was created
commenting, “The rock was subjected to faulting while the rock mass
was still hot causing it to deform in this unique way. Instead of
breaking or shattering along the fault plane creating breccia or gouge,
the rock deformed and became grooved because it was still hot and
quite malleable. The rock certainly is unique because the rock has to
be just at the right temperature and depth to deform in this way. So it
is obvious to see how it would stand out.” They also concluded that
since the surface is so fresh and shows little or no erosion, the
mullion was probably unearthed in recent times, perhaps by the Inca.
Один из многих походных вулканчиков. Быстрый способ получения качественных стройматериалов по-месту. Что ту же скважину для питьевой воды пробить...
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) А именно...
) скорее вего что-то похожее нашли рядом, начали копать, грунт насыпали в пирамидку, вариант?