Noah's Ark... Page 18
Noah's Ark... Page 18

Giant Sea-bed Pockmarks

And the flood was forty days upon the earth; and the waters increased, and bare up the ark, and it was lift up above the earth. And the waters prevailed, and were increased greatly upon the earth; and the ark went upon the face of the waters.

And the waters prevailed exceedingly upon the earth; and all the high hills, that were under the whole heaven, were covered. Fifteen cubits upward did the waters prevail; and the mountains were covered. And all flesh died that moved upon the earth, both of fowl, and of cattle, and of beast, and of every creeping thing that creepeth upon the earth, and every man: All in whose nostrils was the breath of life, of all that was in the dry land, died.And every living substance was destroyed which was upon the face of the ground, both man, and cattle, and the creeping things, and the fowl of the heaven; and they were destroyed from the earth: and Noah only remained alive, and they that were with him in the ark. And the waters prevailed upon the earth an hundred and fifty days.... Genesis 7

Giant Sea-bed Pockmarks: Evidence for Gas Escape from Belfast Bay, Maine
Joseph T. Kelley and Stephen M. Dickson
Maine Geological Survey, Station 22, Augusta, Maine 04333 Daniel F. Belknap, Walter A. Barnhardt, and Mark Henderson Department of Geological Sciences, University of Maine, Orono, Maine 04469


Circular depressions, or pockmarks, cover the sea floor in many estuarine regions of the western Gulf of Maine.In Belfast Bay, Maine, they are found in densities up to 160/km2, are up to 350 m in diameter and 35 m in relief, and are among the largest and deepest known.The pockmarks appear to form from the escape of biogenic natural gas and pore water and are far larger than features associated with thermogenic gas elsewhere.
These pockmarks are thought to have formed (1) catastrophically during an earthquake, tsunami, or storm, or (2) slowly over thousands of years.
Recent observations of bubble releases suggest continuing activity and a potential geologic hazard. The pockmarks involve a poorly documented coastal process of sediment redistribution and methane release, largely unrecognized in the rock record but widespread in middle- to high-latitude embayments.

Article 2: Giant Sea-bed Pockmarks

[The following long, initially dull (?) discussion leads unerringly to the Bermuda Triangle via a Fortean phenomenon!]Unrecognized until just a few years ago sea-bed pockmarks are remarkable geological features.
They occur worldwide on the floors of all of the oceans and even some lakes. They are found in shallow waters and at depths of thousands of meters. In diameter, these roughly conical depressions may span 350 meters or more and be up to 35 meters deep.

No trivial phenomenon, some pockmark fields exceed 1,000 km2. Like the curious abyssal ridges sea-bed pockmarks are rarely discussed despite their great geological and economic importance.

Recent issues of Geology contain three fascinating papers relating to giant sea-bed pockmarks. In Ref. 1, J.T. Kelley et al describe a pockmark field in Belfast Bay, Maine. Here, the density of the pockmarks reaches 160 per km2, and they are apparently the largest pockmarks yet discovered. The Belfast Bay field is "fresh" and "active" in the sense that the pockmarks are sharply defined and methane bubbles still stream up from buried organic matter. Natural-gas plume rising from the sea-floor off the Carolina coast. Another pockmark field is the subject of P.R. Vogt et al (Ref. 2). It occupies a strip about 1.3 km wide and 50 km long between Greenland and Spitzbergen. This strip of pockmarks seems to be underlain by a deposit of methane hydrate 200-300 meters thick. [Methane hydrate is a weird substance that looks like dirty ice. When brought to the surface, the methane fizzes away, leaving only a puddle of dirty water!] Lastly, in Ref. 3, C.K. Paull et al report on the release of plumes of methane bubbles from the Carolina continental rise at a depth of 2167 meters. Here, the sediments are riddled with methane hydrate.Why all this fuss over fizzy ice, and what is the connection between methane hydrate and pockmarks?

1. The methane hydrate deposits represent immense accumulations of methane -- probably far more natural gas than geologists have found on the continents.

2. Sea-bed pockmarks are thought to be formed when methane gas is explosively vented, perhaps when methane hydrate -- very unstable stuff -- suddenly decomposes.

3. Offshore booms and mistpouffers (SF#73*) are often heard in the areas where pockmarks are common.

4. Rich clusters of methane-dependent life forms surround methane seeps.

5. The quantity of buried organic matter required to create all the offshore methane is staggering. Where did it all come from and how did it come to be buried at such great depths? Could some of the offshore methane be abiogenic?

6. Could the explosive decomposition of methane hydrate create giant bubble plumes that might engulf ships (in certain infamous "triangles") and cause them to sink like rocks in the low-density froth? (SF#25*)


Ref. 1. Kelley, Joseph T., et al; "Giant Sea-Bed Pockmarks: Evidence for Gas Escape from Belfast Bay, Maine," Geology, 22:59, 1994. Ref. 2. Vogt, Peter R., et al; "Methane-Generated (?) Pockmarks on Young, Thickly Sedimented Oceanic Crust in the Arctic: Vestnesa Ridge, Fram Strait," Geology, 22:255, 1994.~Ref. 3. Paull, Charles K., et al; "Methane-Rich Plumes on the Carolina Continental Rise: Association with Gas Hydrates," Geology, 23:89, 1995



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