Mar 19,
2007
More Martian “Lava Tubes”
When planetary scientists see
complex channel networks on Mars, they typically think of
collapsed lava tubes. But now, it is the lava tube theory
that is collapsing, under the weight of unjustified
assumptions.
In considering the Martian surface features above, the first
requirement is to see the network of depressions as
depressions. For some observers this may require training
the brain to recognize that the light is coming from the
left.
The original caption to the above image released by the
THEMIS team states unequivocally that “the deep channels
likely began as subsurface lava tubes whose roofs collapsed
as pits developed over them. Examples of this process are
clearly evident throughout the scene. Also present are
relatively straight graben that crosscut many of the
channels and pit chains.”
It is dismaying to see how routinely planetary scientists
ascribe channels and chains of craters on the Martian
surface to “collapsed lava tubes.” But their limited tool
kit allows for no other explanation. In the same way, steep
parallel-walled “sunken” terrain that doesn’t fit into the
“collapsed lava tube” theory is, with no attention to
anomalous details, attributed to faulting and labeled as “graben.”
From the caption noted above, it does not appear that the
awkward intermingling of categories caused NASA scientists
to pause and look more closely.
But is there evidence of any collapse at all in these
images? Many of the Martian features are shallower than
would be expected from a collapsed roof of a lava tube. And
where is the rubble? The floors of collapsed lava tubes on
Earth invariably display heaps of jagged debris. Where are
the caves opening to the underground “tubes”? Thousands of
similar channels and crater chains can be observed on Mars,
but we have found only one arch and no openings to the
underground vents that the explanation requires. (If
any reader of this piece knows of an exception, we would be
grateful for a correction.) The common feature of collapsed
lava tubes on Earth is the cave allowing visitors to peer
into that part of the tube which has not collapsed. See “The
Moon and its Rilles (2).”
Geologists define a “graben” as the subsidence of a surface
due to parallel faults. In the picture above, the direction
of the supposed “grabens” is noted by blue arrows. Is there
any useful terrestrial analog that would justify a theory of
grabens and collapsed lava tubes superimposed in this way?
By all appearances, the processes creating the one neither
affected, nor were affected by, the existence of the other.
Either pre-existing grabens were incapable of deflecting the
flow of lava, or the lava flowed uphill and downhill,
ignoring gravity. We also see an abundance of “lava tubes”
intersecting and overlapping in ways that critical-minded
observers, giving attention to detail, will surely see as
preposterous.
Our knowledge of collapsed lava tubes came from the geology
of our own planet. But where on Earth do we see anything
remotely like this tangled network of “lava tubes”?
With the advent of the HiRISE project, NASA will have plenty
of opportunity to look at the terminations of candidate
channels from angles that will provide a good view into the
theorized caves—if they are there. While we are not
ready to make categorical predictions, we suspect they will
be consistently disappointed. And when it comes to the
depressions imaged above, we confidently stand by the
prediction that no openings will be found, no matter how
closely HiRISE scrutinizes the region. Many terminations are
clearly visible, and they are constituted of sharply and
smoothly cut cliffs, with no openings to caves.
For such anomalous features on Mars we have given the name
“pits, scoops, and gouges,” to emphasize an undeniable
implication: material has been removed by forces acting
on the surface from above. We do not believe it is
rational to ignore the one force—electricity—which, acting
on a surface from above, can remove material to produce the
very observed patterns: scooped out depressions, crater
chains, and extended channels. Though it can be very
difficult to get planetary scientists to consider the role
of cosmic currents in the past, a thousand different
evidential threads do, in fact, point in exactly the same
direction.
But if misdirection in planetary science is occurring at the
scale we believe, the problem will require at least a few
investigators to look more deeply.
_____________________________
Thanks to Michael Gmirkin for much of the factual content in
this submission.