Post by Dave on Mar 24, 2022 11:11:34 GMT -5
Whole-Earth Decompression Dynamics
J. Marvin Herndon
Transdyne Corporation
San Diego, California 92131 USA
June 30, 2005
J. Marvin Herndon
Transdyne Corporation
San Diego, California 92131 USA
June 30, 2005
Abstract
The principles of Whole-Earth Decompression Dynamics are disclosed leading to a new
way to interpret whole-Earth dynamics. Whole-Earth Decompression Dynamics
incorporates elements of and unifies the two seemingly divergent dominant theories of
continental displacement, plate tectonics theory and Earth expansion theory. Whole-Earth
decompression is the consequence of Earth formation from within a Jupiter-like protoplanet with subsequent loss of gases and ices and concomitant rebounding. The initial
whole-Earth decompression is expected to result in a global system of major primary
decompression cracks appearing in the rigid crust which persist as the basalt feeders for
the global, mid-oceanic ridge system. As the Earth subsequently decompresses, the area
of the Earth’s surface increases by the formation of secondary decompression cracks,
often located near the continental margins, presently identified as oceanic trenches. These
secondary decompression cracks are subsequently in-filled with basalt, extruded from the
mid-oceanic ridges, which traverses the ocean floor by gravitational creep, ultimately
plunging into secondary decompression cracks, emulating subduction. Much of the
evidence presented in support of plate tectonics supports Whole-Earth Decompression
Dynamics, but without necessitating mantle convection/circulation or basalt re-cycling.
Moreover, the timescale for Earth decompression is not constrained to the last 200
million years, the maximum age of the current ocean floor.
Communications: mherndon@san.rr.com NuclearPlanet.com
Key Words: plate tectonics, geodynamics, protoplanet, Earth expansion, subduction
Introduction
For more than a century, scientists have recognized that opposing margins of continents
fit together in certain ways and display geological and palaeobiological evidence of having in the past been joined. In the nineteenth century, Suess1
envisioned a vast palaeocontinent that had broken up and partially subsided into the ocean floor. Suess’s
concept was subsequently recognized as untenable because continental rock is less dense
than ocean floor basalt. Early in the twentieth century, Wegener2 also proposed that the
continents at one time had been united, but subsequently had separated and drifted
through the ocean floor to their present positions. Wegener’s theory of continental drift,
generally not accepted for half a century, was revived in the 1960s, mainly as the result of
investigations of oceanic topography3-6 and palaeomagnetism7-9, and modified to become
plate tectonics theory.
Widely accepted at present despite certain unfounded fundamental assumptions, plate
tectonics theory is predicated upon the idea that ocean floor, continuously produced at
mid-oceanic ridges, moves like a conveyer belt, ultimately being subducted and recirculated by assumed convection currents in the mantle10-12. Indeed, compelling evidence, e.g., seafloor magnetic striations, exists to support the idea of seafloor being continuously produced at mid-oceanic ridges, moving away from the ridges and being subducted, for example, by entering oceanic trenches. To date, however, there is no direct, unambiguous evidence that mantle convection and/or mantle circulation actually
takes place; in fact, there is some evidence to the contrary13. Moreover, there is no
evidence that oceanic basalt can be repeatedly recycled through the mantle without being
substantially and irreversibly changed. Yet, mantle convection/circulation and basalt
recycling are fundamental necessities for the validity of plate tectonics. Furthermore,
plate tectonics theory does not in and of itself provide an energy source for geodynamic
activity.
In 1933, Hilgenberg14-15 first published his observation that, on a sphere with a radius of
about one half of the Earth's present radius, the continents more-or-less fit together like
pieces of a jigsaw puzzle and, notably, form a uniform, continuous shell. Ideas that, at
some time in the past, the Earth's radius was significantly less than its present value and
that the separation of the continents occurs as a consequence of volume expansion of the
Earth have been discussed for more than half a century16-20. As an alternative to plate
tectonics theory, classical Earth expansion theory, as espoused by Carey21 and others, has
met with resistance because of the lack of knowledge of an energy source of sufficient
magnitude and because it is predicated upon the idea that Earth expansion occurs mainly
along mid-oceanic ridges and occurred during the last 200 million years, as the oldest
ocean floor is no older than that22. Moreover, some argue, geological folding observed in
various places, including in many mountain ranges, appears indicative of lateral stress
rather than vertical uplifting.
Neither plate tectonics theory nor classical Earth expansion theory, I submit, is an
adequate description of the dynamics of the Earth as a whole. Here, I propose a strikingly
new theory that reconciles certain elements of those two seemingly divergent theories into one unified theory, designated Whole-Earth Decompression Dynamics. I propose
that whole-Earth dynamics, as viewed from the surface, is characterized primarily by the
following two distinct, but related, processes: (i) the formation of decompression cracks
(often near continental margins), and (ii) the in-filling of those cracks with basalt
(produced by volume decompression in the mantle), which is extruded mainly at midoceanic ridges, solidifies and traverses the ocean floor by gravitational creep to regions of
lower gravitational potential energy, ultimately plunging downward into distant
decompression cracks, thus emulating subduction23. As shown below, much of the
evidence presented in support of plate tectonics supports Whole-Earth Decompression
Dynamics, but without necessitating mantle convection/circulation. Moreover, the
timescale for Earth decompression is not constrained to the last 200 million years, the
maximum age of the current ocean floor.
Protoplanetary Origin of Whole-Earth Decompression Dynamics
Planets generally consist of concentric shells of matter, but there has been no adequate
geophysical explanation to account for the Earth’s non-contiguous crustal continental
rock layer, except by assuming that the Earth in the distant past was smaller and
subsequently expanded. The principal impediment to the idea of Earth expansion has
been the lack of knowledge of a mechanism that could provide the necessary energy24-25
without departing from the known physical laws of nature26. In 1982, Scheidegger27
stated concisely the prevailing view, "Thus, if expansion on the postulated scale occurred
at all, a completely unknown energy source must be found." Recently, I disclosed just
such an energy source that follows from fundamental considerations23.
The so-called “standard model” of Solar System formation, which assumes the
condensation of dust from a tenuous nebular and subsequent agglomeration into
successively larger grains, pebbles, planetesimals and then planets is wrong and leads to
the contradiction of terrestrial planets having insufficiently massive cores. Instead, I have
shown the consistency of Eucken’s 1944 concept28 of planets raining out in the central
regions of hot, gaseous protoplanets29. The Earth, together with its complement of lost
primordial gases, comprises a protoplanetary mass remarkably similar to the mass of
Jupiter. I have shown that formation of Earth, from within a Jupiter-like protoplanet, will
account for the compression of the rocky Earth to about 64 percent of its current radius,
yielding a closed, contiguous continental shell with whole-Earth decompression
commencing upon the subsequent removal of its protoplanetary gaseous shell23.
Gravitational energy of compression, stored during the Jupiter-like protoplanetary stage,
may be seen as the primary energy source for subsequent Earth decompression during its
approach toward a new hydrostatic equilibrium. To a much lesser extent, nuclear fission
energy and radioactive decay energy30-32 may augment the stored energy of
protoplanetary compression, heating the interior of the Earth, and compensating to some
extent for the cooling that results from decompression.
Principles of Whole-Earth Decompression Dynamics
After being stripped of its great overburden of volatile protoplanetary constituents,
presumably by the high temperatures and/or by the violent activity, such as T Tauri-phase
solar wind33-36, associated with the thermonuclear ignition of the Sun, the Earth would
inevitably begin to decompress, to rebound toward a new hydrostatic equilibrium. One
may envision the initial rebounding to result in a global system of major primary
decompression cracks appearing in the rigid crust as the internal shells expand,
decompressing to lower densities. The locations of initial primary decompression cracks
are identified presently as the basalt feeders for the global, mid-oceanic ridge system.
As the Earth subsequently decompresses and swells from within, the deep interior shells
may be expected to adjust to changes in radius and curvature by plastic deformation. As
the Earth decompresses, the area of the Earth’s surface increases by the formation of
secondary decompression cracks often located near the continental margins and presently
identified as oceanic trenches. These secondary decompression cracks are subsequently
in-filled with basalt, extruded from the mid-oceanic ridges, which traverses the ocean
floor by gravitational creep.
Whole-Earth decompression should have commenced promptly upon removal of
protoplanetary hydrogen and other volatile constituents. However, the timescale for the
Earth’s full rebounding from protoplanetary compression may be long, even extending
into the present; witness, for example, the relatively minor rebounding of northern land
masses, following post-Pleistocene deglaciation, being measured in thousands of years37.
A much, much longer time may be expected for rebounding from compression due to
protoplanetary-scale loading by approximately 300 Earth masses of volatile constituents.
The timescale for decompression may be related to the pre-degasification protoplanetary
thermal state, to the dynamics of degasification, especially the cooling that might have
been involved, to mantle properties, to the cooling that results from decompression, and
to the time required to replace heat lost by decompression cooling.
The Earth appears to be approaching the terminus of its decompression. If the Earth is
presently decompressing, length of day measurements should show progressive
lengthening. Such measurements, made with increasing precision over the last several
decades, show virtually no current lengthening38, implying no current secondary
decompression crack formation. The formation of secondary decompression cracks might
be episodic, though, like the release of stress by major earthquakes, or secondary crack
formation may have ended forever. But major decompression cracks are still
conspicuously evident, for example, circum-pacific trenches, such as the Mariana Trench.
The complementary Whole-Earth Decompression Dynamics process of basalt extrusion
and crack in-filling, however, continues at present.
Secondary crack formation and the in-filling of those cracks are complementary elements
of the same Whole-Earth Decompression Dynamics process. Even in the absence of
current secondary decompression crack formation, an estimate may be obtained of recentperiod Earth decompression by considering the amount of in-filling basalt presently being
produced. One may make the rough assumption that, over an arbitrary period of time, the
rate of secondary crack volume formation at the Earth’s surface is equal to the volume
rate of extruded basalt. The volume rate of extruded basalt is thus related to the rate of decompression. The high-end estimate of 15 km3 /yr for current basalt production leads to
an estimated annual percent increase in radius of only about 5 X 10-10, a value not
inconsistent with length of day measurements. Much higher basalt extrusion rates
undoubtedly have occurred in the past, as the present estimated annual percent increase in
radius, if constant over the lifetime of the Earth, would have only resulted in a 2 percent
increase in radius.
Geological Features
Plate tectonics, despite certain unfounded underlying assumptions, has enjoyed wide
acceptance because it appears to describe many of the geological features that result from
Whole-Earth Decompression Dynamics. There are subtle and profound differences,
though, as shown by the following brief remarks on global and regional geological
features.
The principal surface manifestation of the Whole-Earth Decompression Dynamics is the
in-filling of secondary decompression cracks, located mainly near continents, with basalt
extruded from mid-oceanic ridges. The following observations of oceanic features and
the consequences of down-plunging slabs, usually arrayed as supporting plate tectonics
theory, are, I submit, consequences of Whole-Earth Decompression Dynamics: ocean
floor magnetic striations, transform faults, island arc formation, guyot formation,
contributions of seamounts to coastal geology, and the generation and distribution of
earthquakes. These have the same basis and understanding in Whole-Earth
Decompression Dynamics as in plate tectonics. But there are global, fundamental
differences between Whole-Earth Decompression Dynamics and plate tectonics,
especially as pertains to the growth of ocean floor, to the origin of oceanic trenches, to
the fate of down-plunging slabs, and to the displacement of continents.
In Whole-Earth Decompression Dynamics mid-oceanic ridges are thought to be the sites
of the original, global system of primary decompression cracks which serve as persistent
extrusion-basalt feeder-channels. There is no evidence that the mid-oceanic ridge system
represents the edges of mantle-convection cells as implied by plate tectonics. Ancillary
basalt extrusion also occurs from hot-spots, non-mid-oceanic-ridge feeders, such as those
responsible for the formation of Hawaii and Iceland. Hot-spot basalt may ultimately fill
secondary decompression cracks or it may add to continental mass directly or as
incorporated terranes.
In Whole-Earth Decompression Dynamics, oceanic trenches, such as the Mariana Trench
and others that rim the pacific basin, are thought to be surface manifestations of
decompression cracks, more or less continuously being formed as the Earth decompresses
and, notably, continuously being in-filled. Indeed, mantle seismic tomography results can
be interpreted as imaging in-filled decompression cracks. There is no evidence that
oceanic trenches represent the edges of mantle-convection cells as implied by plate
tectonics and no reason to believe that the more-or-less lateral motion of moving seafloor
can in and of itself produce trenches. In Whole-Earth Decompression Dynamics, oceanic
troughs are thought to be partially in-filled decompression cracks.
Since Suess1, understanding the process of mountain building has been hampered by
conflicting evidence in a complex geological framework39 and by limitations imposed
through incorrect theories. For example, plate tectonics, while allowing for the
development of lateral stress, is capable of admitting only asymmetric uplift by plate
underthrust. Similarly, classical Earth expansion allows for symmetric uplift, but not
lateral stress. In Whole-Earth Decompression Dynamics, on the other hand, both
processes are possible. Lateral stress occurs for the same reasons as in plate tectonics and,
additionally, occurs as a consequence of the formation of secondary decompression
cracks. Symmetric uplift may also occur during decompression and asymmetric uplift by
plate underthrust.
Grand Overview
There has long been a duality of thought on the nature of the circumstances that gave rise
to the planets of our Solar System. In 1944, on the basis of thermodynamic
considerations, Eucken28 suggested core-formation in the Earth, as a consequence of
successive condensation from solar matter, on the basis of relative volatility, from the
central region of a hot, gaseous protoplanet, with molten iron metal first raining out at the
center. For a time hot, gaseous protoplanets were discussed40-42, but emphasis changed
abruptly with the publication by Cameron43 of his diffuse solar nebula models at
pressures of about 10-5 bar.
During the late 1960s and early 1970s, the so-called “equilibrium condensation” model
was contrived and widely promulgated44. That model was predicated upon the
assumption that the mineral assemblage characteristic of ordinary chondrite meteorites
formed as condensate from a gas of solar composition at pressures of about 10-5 bar.
During those years, scientists almost universally believed that the Earth is like an
ordinary chondrite meteorite. Consequently, the idea that dust agglomerated into grains,
pebbles, rocks and then into planetesimals seemed, superficially at least, to explain planet
formation and planet composition. The problem, as I have shown, is that “equilibrium
condensation model” is wrong45 and the “standard model” of solar system formation
would result in the terrestrial planets having insufficiently massive cores, a profound
contradiction to observations29. Massive cores are instead indicative of terrestrial-planetcomposition-similarity to enstatite chondrite meteorites, whose highly-reduced state of
oxidation may be thermodynamically stable in solar matter only at elevated temperatures
and pressures29,46,47.
Rather than the presently popular idea of Earth formation solely from the accumulation of
small bodies subsequent to the dissipation of hydrogen and other volatiles into space, I
have suggested29, as has Eucken28 and others, that, prior to the ignition of thermonuclear
reactions in the Sun, the proto-planetary Earth formed as a giant gaseous Jupiter-like
proto-planet. This concept is more consistent with observations of close-in gas giants in
other planetary systems48. Such a giant proto-planetary-Earth would be expected to have
a differentiated core of enstatite-chondrite-like alloy-plus-rock overlain by nearly 300
Earth-masses consisting of hydrogen, noble gases, and other volatile constituents. Under
such a great overburden of gases and ices, the relatively non-volatile chondrite-like alloyplus-rock constituents, which now comprise most of the Earth, would be compressed by
gravity to about 64% of the present day Earth radius23.
Decompression of the Earth may be seen as a direct consequence of the subsequent
removal of hydrogen and other volatile constituents, presumably during the
thermonuclear ignition of the Sun. After being stripped of such a great overburden, the
Earth would rebound, tending toward a new hydrostatic equilibrium. Gravitational energy
of compression, stored during the Jupiter-like proto-planetary stage, may be seen as the
primary energy source for driving geotectonic activity, augmented to a much lesser extent
by nuclear fission and radioactive decay energy49.
The initial whole-Earth decompression is expected to result in a global system of major
primary decompression cracks appearing in the rigid crust which persist as the basalt
feeders for the global, mid-oceanic ridge system. As the Earth subsequently
decompresses, the area of the Earth’s surface increases by the formation of secondary
decompression cracks, often located near the continental margins, presently identified as
oceanic trenches. These secondary decompression cracks are subsequently in-filled with
basalt, extruded from the mid-oceanic ridges, which traverses the ocean floor by
gravitational creep, ultimately plunging into secondary decompression cracks, emulating
subduction. This is Whole-Earth Decompression Dynamics.
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