New Model Reveals
Evidence of a First Ancient
"Archean Continent" - Part
One
Data from a NASA and ESA satellites imaging
Antarctica's graveyard of age old continental
remains has uncovered the ancient cratons
of an Archean landmass.
The first continent of Yidath, as rendered by
geological artists based on craton and deep sea
radar investigations from Australia on to the shores
of Antarctica. Preliminary evidence shows very
highly developed organic structures and atmospheric
evidences, based on fossils discovered in Antarctica.
During the modern area. the theory that the
Archean Eon - from nearly 4.0 billions years
ago - was preceded by the great geological
upheavals and a molten state of the Hadean
Eon has been accepted by academics and
scientific circles alike.
The earth's atmosphere, according to theory,
had no free oxygen but was composed of
nitrogen and methane. The crusts had begun
to form. The primitive oceans began to
appear during the earliest Archean
(Eoarchean Era) with abundant volcanoes
outgassing with the condensation for water.
The carbon dioxide flows from these same
volcanoes also contributed to the creation of
the world's atmosphere, ozone layer and
great oceanic ridges that formed thick
oceanic plateaus. The globe then cooled,
gradually providing the stable environment
needed for early landforms and life to arise -
prkaryotic microbes - which appeared some
3.5-3.7 billion years ago.
Current theories suggest the Archean Earth of four
billion years ago was beginning to cool down and see
the formation of continents, the stable formation of
an atmosphere of methane and oceans trapping
oxygen in water form. Nearly 2.7 billion years ago,
bluish-green microscopic organisms called
cyanobacteria began to flourish in Earth's oceans.
The moon began to form during this period.
But with the analysis of records from Karvon
University, using data from NASA’s newest
satellite mission, the Ice, Cloud and land
Elevation Satellite-2 (ICESat-2), having
provided detailed geological images of
Antarctica from space, evidence from
previous satellites has shed light on a
mystery that may question this geological
speculation.
The European Space Agency's Gravity Field
and Ocean Circulation Explorer program was
discontinued over six years ago and was
studying how gravitational fields effect areas
of the Earth. This also included the
investigation of geological data from Landsat
8 launched in 2013 and the Terra satellite
launched into Earth orbit by NASA in 1999.
Using Japan's Advanced Spaceborne Thermal
Emission and Reflection Radiometer (ASTER),
the Terra satellite provided data used to
create detailed maps of surface height
elevations of land, emissivity, reflectance,
and elevation.
But with the help of data from these
discontinued European and American
satellites, not only had scientists discovered
that East Antarctica has large mass of
continental remains from the prehistoric
past, but that neighboring landmasses like
Australia and India could contain evidences
of a first, unknown and unspeculated
Archean continent.
Photo: Geological continental barrier in southern
Africa (Kaapval Craton). Current geological theories
indicate the first modern landmass that formed was
Pangea. Pangea was a supercontinent that arose
during the late Paleozoic and early Mesozoic eras. It
assembled from earlier continental fragments 335
million years ago, and fragmented itself about 175
million years ago. Ur, a proposed first Archean
continent with some evidence, had been accepted to
be the stable 'first' based on geological cratons.
Scientists have created stunning 3-D maps of
the southernmost Earth's tectonic crust
substructures and have found that these
continent's coastlines, when fractured crusts
based on geological similarities are
assembled from various coastlines shows
how this hypothetical landmass of the
ancient Archean supercontinent was
assembled and then spectacularly destroyed.
The scientists, led by Alfred Wegener, a
geophysicist at West Ashington University in
Helsinger, Denmark, announced their
research findings later this year in Science
Daily News.
"If our theory proves to be correct, it may
require revision to many aspects of our
understanding of the Earth's geological and
prehistoric histories, including the epochs of
the past continents and possibly even the
onset of plate tectonics."
AN ANTARCTIC DISCOVERY
Recent studies of the data from the GOCE
(Gravity Field and Steady State Ocean
Circulation Explorer), that operated from
2009 to 2013, provided the detailed analysis
of 'cratons', stable, rocky remains found in
the region that separates the crust and
mantel in what is called the lithosphere in
Antarctica. These cratons are rocky cores of
the remains of ancient continents that have
survived several billion years, overcoming
the destructive engine of the world's plate
tectonics.
Cratons can be found on all the major
continents today. They are often part of vast
structures of what scientists call 'shields',
where craton's rocks have been widely
disbursed on the surface and composed of
Precambrian crystalline debris, which may be
covered by younger sedimentary rock.
Cratons contain a grand record of the
landmasses that had once existed on the
Earth in past prehistoric epochs, and most
were combined to form them that are now
part of our modern geography.
Insert: The GOCE (Gravity Field and Steady State
Ocean Circulation Explorer) pictured in orbit in 2013.
Using high definition imaging and radar the probe
provided scientists with clear data on the ancient
cratons and continental 'fingerprints'. Image: The
Transantarctic Mountains Range's craton region.
"The geological age of these structures can
be greater than 600 million years and can
date some 3 to 4.5 billion years," said
Professor Wegener from his office in
Helsinger's Geosciences Division, "Cratons
are the footprints of continental histories.
They are a window into the remote part of
Earth's ancient past."
The images from GOCE discovered the
remains of at least three geological
landmasses on Antarctica, ranging from the
more recent Gondwana from 500 to 160
million years ago, Rodinia which may have
come together and dominated some one
billion years ago, or Columbia, another
confirmed, evidenced supercontinent, that
appears to have risen some 1.8 to 1.5 billion
years ago.
The Transantarctic Mountains separate East and
West Antarctica. The rift system that formed them is
caused by a movement of surface mass along the
East Antarctic Craton. Antarctica has been called the
"graveyard of continents" based on their remains
dating geologically some three billion years.
Other continental titans that scientists have
observed in other cratons are Kenorland,
which is thought to have existed some 2.4
billion years ago and Ur, which has been
classified as the earliest ancient landmass
from three billion years ago. Vaalbara, which
is evidenced in the Yilgarn Craton, is more of
a speculation than an actual science finding,
was found in Western Australia.
The discovery on Antarctica created what has
become a major combination of speculations
and debates. Even as the South Polar
landmass is buried in an average of 2 miles
of snow and ice, the tools of ground
penetrating radar, seismic data and magnetic
readings can peel back those hidden layers
and reveal the mysteries beneath.
While there is much to understand about the
Earth's most remote and inhospitable region,
the ice, using these technical tools, yielded
her secrets and may have provided a new
discovery yet unimagined.
THE BOURNE JOURNAL OF
ARCHAEOLOGY
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