Geology news

Glass on Mars

At http://news.discovery.com/space/mars-dark-spots-120402.html ... a piece on the discovery of glass on the surface of Mars - and explanations offered. Dark patches visible across much of the northern hemisphere of Mars are not canals or other geological features as once thought, in the dimmer past, but volcanic glass - via data from ESAs Mars Express Orbiter. It is unclear if this is glass as we might understand it or something else. It is also described as basalt - and basalt has an origin in magma from volcanic and seismic activity.

Sahara Sand

Gary has sent in a couple of links that people may find stimulating - Sahara sand under the microscope. See http://vixra.org/pdf/1102.0022v1.pdf and www.myspace.com/jonlarsenguitar/photos/51836900

The mystery is there are micrometeorites in sand - in desert soils, in beach sand, and in glaciers. The deposition of micrometeorites can be found vritually anywhere - even in downpipes from the gutter of your house. Iron micrometeorites can be found with a magnet.

Wandering continents

NASA sicentists have been looking at how continents wander and plate tectonics in general - see www.sciencedaily.com/releases/2012/03/120322161938.htm. A layer of partially molten rock deep underground is thought to be the mechanism that allows continents to wander - or plates. What else might be going on? Seismometer data suggests this layer is patchy - especially under the Pacific Ocean.

Big Game hunting game

The climate versus human hunter theory has surfaced once again in Australia and once again achieves very little in settled science but does manage once again to denigrate the Aboriginal population - see www.physorg.com/print251656739.html. A team of scientists from six universities say they have put an end to the long running debate - a bit of wishful thinking, perhaps. Hunters, they claim, killed off the large herbivores such as giant wombats and the like and shortly afterwards, there was a rapid shift in climate, caused by guess what, the lack of herbivores to munch the vegetation.

A big lump of sand in the North Sea

A ten cubic km wedge of sand now exists in the northern North Sea basin, somewhat south of Norway and east of Scotland, enough to bury Manhattan island under 160m of sand or the whole of London under 6m of sand (and that is an awful lot of the stuff). It appears to be extrusive - rising up from the gizzards of the earth. The paper is in the journal Geology March 19th but the big question might be - if sand is formed from eroded rocks why was so much of it buried under the sea floor?

Global Sea Levels

Global sea levels are pretty well flat at the moment but a paper in the journal Geology is not at all discouraged by this and assures us one and all that they are set to rise by 40 to 70 feet - see www.physorg.com/print251376839.html. Part of the research was done on a coral atoll in the Pacific and some of it in the seismically active area of New Zealand and soil cores taken from Virginia were also used - but it is unclear if any of this has a bearing on the conclusions.

Sicily to Tunisia

In a book picked up from a charity shop, Art and History of Egypt by Alberto Carlo Carpiceci, it begins with some extraordinary geological information on the Mediterranean basin. The Italians would be more concerned with this part of the world than people over against the Atlantic seaboard. It says that in the Palaeolithic era the Mediterranean Sea was cut into two basins - divided by a tongue of land that joined Tunisia and Italy, the islands of Malta being a remnant.

Subduction

The Mariana Trench in the Pacific has been mapped (mentioned in an earlier piece) with ultrabeam sounding technology and scientists, subsequently, have measured the depth - roughly 11000m. However, it is the discovery of four bridges spanning the trench that is most surprising and they are thought to be caused by one plate descending into the hole and becoming snagged when the sea plate subducting has sea mounts. There are lots of sea mounts on the Pacific plate and are as much as 2500m high.

The Moon and Tidal Rhythmites

Gary has sent in details of a paper that can be found at www.eos.ubc.ca/~mjelline/453website/eosc453/E_prints/1999RG900016.pdf which has the subject of 'tidal rhythmites' - an interesting subject from a uniformitarian and a catastrophist angle.

Conifers in the far north that survived the Ice Age

This story is at www.sciencedaily.com/releases/2012/03/120301143737.htm and begins by saying that it has been assumed that the last Ice Age denuded the Scandinvian landscape of trees until the milder weather of the Holocene kicked in and trees seeded themselves back into the region from somewhere in the south. A paper in Science says this might not actually be true and there were ice free pockets or refuge areas where spruce and pine trees survived - to reseed the areas covered by the ice sheet.