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YEC INTREP
Actually, that conclusion presupposes that there was a Gondwanaland in the first place.Fossil Mantle Plume Under South America"The conduit appears to have remained geographically fixed with respect to the overlying continent despite thousands of kilometers of South American plate motion. This observation runs contrary to a major tenet of plate tectonic theory -- that the motion of lithospheric plates is essentially independent of flow in the upper mantle beneath the plates -- and implies that the upper mantle and the overlying South American continent have remained coupled since the breakup of the Gondwanaland super-continent and opening of the South Atlantic Ocean some 120 million years ago.
by William Corliss
But What About The Hawaiian Volcanic Chain?P.D. Ihinger is challenging the well-entrenched "Hawaiian-volcanic-chain" theory. For example, the Hawaiian volcanoes do not line up exactly. There are dozens of short, overlapping segments rather than a continuous trace across the Pacific basin. On the map, you will also see a sharp dog-leg in the trace. Further, the volcanoes Mauna Loa and Mauna Kea, only 40 kilometers apart, disgorge lavas that are distinctly different.
by William Corliss
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http://www.agu.org/meetings/fm04/fm04-sessions/fm04_U33A.html
The Tarim APWP Paradox
Gilder, S -- Institut de Physique du Globe de Paris, 4 place Jussieu, Paris cedex 05, IdF 75252 France
Cogne, J -- Institut de Physique du Globe de Paris, 4 place Jussieu, Paris cedex 05, IdF 75252 France
Courtillot, V -- Institut de Physique du Globe de Paris, 4 place Jussieu, Paris cedex 05, IdF 75252 France
Chen, Y -- Universite d'Orleans, BP6749, Orleans, 45067 France
Gomez, J -- Institut de Physique du Globe de Paris, 4 place Jussieu, Paris cedex 05, IdF 75252 France
Central Asia boasts one of the world's densest regions sampled for paleomagnetic data thanks to numerous sections of well-exposed rocks possessing stable remanent magnetizations. Such is the case for the Tarim craton, which is represented by a quasi-continuous time sequence of paleomagnetic poles since the Permo-Carboniferous. Most of these poles are derived from studies demonstrating positive fold and-or reversal tests, with N equal to or greater than 6 sites or 50 samples. Samples collected from Permo-Carboniferous rocks usually have reverse polarities, and samples collected from Cretaceous rocks usually have normal polarities, consistent with the geomagnetic polarity time scale. Despite the apparent excellent quality of the paleomagnetic data from Tarim, they impose geologically unrealistic tectonic displacements when compared to the Eurasian and-or Indian APWPs. This leads to the Tarim APWP paradox: is there a problem (inclination shallowing, overprinting, etc.) with the plentiful Tarim data, or is the Eurasian APWP not representative of the land east of the Ural Mountains? If the latter is true, then previous tectonic reconstructions must be reconsidered. If the former is true, then when/how can we rely on the paleomagnetic data? We present arguments showing that both scenarios have their pros and cons.
How Did Glacial Deposits Form 600 Million Years Ago?Dr. David Pollard, research associate, Penn State College of Earth and Mineral Sciences' Environmental Institute, and James K. Kasting, professor of geosciences at Penn State, believe that glacial deposits that formed on tropical land areas around 600 million years ago could only have formed after the Earth's oceans were entirely covered by thick sea ice. Ice can accumulate in the tropics only if temperatures are below freezing or around freezing with large amounts of snowfall. Tropical glaciers exist today only on high mountain peaks such as the Andes and Mt. Kilimanjaro, and do not reach anywhere near sea level. As the earth cools, the oceans begin freezing. The high reflectivity of the snow and ice that covers the northern and southern oceans reflects, rather than absorbs, the sun's heat and further cools the planet. The researchers conclude that it is unlikely that tropical sea level glacial deposits formed before the collapse into snowball Earth. However, having them form after the oceans freeze also seemed problematic because once the oceans are frozen, the rates of precipitation decrease drastically, to only a few millimeters per year.
Welcome to FR! If we manage to bring over everyone from there, we'll add, well, okay, maybe a couple of dozen... ;') Nice beginning to your profile page!
I lost a pair of RayBans quite a long time ago. I wonder if they found them in that 4 billion year old rock?
bookmark, thanks for posting
Other than LAVA BASED rocks, ALL rocks are the same age!! ALL of the earth except for living things are the SAME AGE except for lava and meteors....am I wrong? Did God make newer rocks?
Early Water on Earth
Geotimes | February 2003 | Salma Monani
Posted on 02/09/2003 7:22:57 PM EST by CalConservative
http://www.freerepublic.com/focus/f-news/839466/posts
Early Earth Likely Had Continents, Was Habitable, According To New Study
University of Colorado at Boulder | 2005-11-18 | University of Colorado at Boulder
Posted on 11/18/2005 11:32:59 PM EST by dila813
http://www.freerepublic.com/focus/f-news/1525001/posts
Crusty Old Discovery Reveals Early Earth’s History
(3.8 billion years old outer crust)
LiveScience.com on yahoo | 3/24/07 | Robert Roy Britt
Posted on 03/24/2007 10:40:45 PM EDT by NormsRevenge
http://www.freerepublic.com/focus/f-news/1806290/posts
Diamonds Tell Story Of Earth’s Beginning
The Telegraph (UK) | 8-22-2007 | Roger Highfield
Posted on 08/22/2007 9:48:58 PM EDT by blam
http://www.freerepublic.com/focus/f-news/1885157/posts