My experiments with volcanoesJaggar, Thomas Augustus
Science
My experiments with volcanoes
Jaggar, Thomas Augustus
Geologists -- Biography; Volcanoes
In the same way volcanic action by the outpouring of lava through
cracks is a process of solution of the deeper crust of the earth by hot
gases, largely burning hydrogen. Lavas emerging from Etna or Mauna Loa
are melted earth crust, dissolved and brought up by this same hydrogen
and by other gases from the walls of profound cracks leading down to
the earth core. Volcanism and metamorphism are thus the same process,
namely the action of gases up cracks through deep earth crust. But
metamorphism acts on continental sediments, whereas modern volcano
eruption acts through sea bottom and sea shore faulting, very ancient
features of the earth and distinct from continents. In Hawaii no
metamorphic rock fragments have been found.
Such primitive oceanic fault fissures extend under continents remnant
from the time of evolution of continents. They bring up the metamorphic
hot gases, which in siliceous sediments, make granites and gneisses and
schists with the aid of groundwater. Geology has no knowledge whatever
of whether this metamorphic process affects the hard rock under the
oceanic muds, because geology has never collected a piece of that rock.
Geology however knows inclusions and explosive fragments from oceanic
volcanoes, and it does not find there granite and gneiss and schist.
However, generalization does not apply to continental volcanoes like
those of Italy and Africa.
The beginning of fossils on continents is commonly considered to have
been 500 million years ago, and this may be extended another 1,500
million years for the most ancient identifiable continental rocks,
and an estimated total thickness of 120,000 feet to the bottom of the
most ancient sediments on earth. We know nothing of thickness of most
ancient volcanic deposits under the oceanic mud.
This brings us to the great German explorer Stübel, who mapped
volcanoes of the Andes, founded a museum of his work in Leipzig, and
published monographs on the Andes. He wrote a final book, including
material on Mount Pelée, on the “genetic differences of volcanic
mountains.” But such modern continentalists as Daly and Bucher in
America have disregarded Stübel. Daly is the authority on a shallow
earth shell and substratum of basalt, and Bucher of Columbia University
is a specialist on continental sediments and granitization.
Public-domain text, read in full here on John Shaqi.
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