Category Archives: Plate Tectonics

Around the World in Eighty Million Years

Posted on February 19, 2014 by gymnosperm

We have been doing a puzzle like you might have been given in first grade where there is some large animal with lines missing and your job is to connect the dots and fill it in. The joy is still … Continue reading →

Posted in Cretaceous normal superchron, Geography, Geology, Magnetic Reversals, Pacific Triangle, Paleogeography, Plate Tectonics, Seafloor Isochrons | Tagged , , | Leave a comment

The Pacific Triangle Revisited, The Impact, The Wave

Posted on February 2, 2014 by gymnosperm

We have explored the Pacific Triangle and the Ring around Antarctica in prior posts. It just seems so outrageous that three spreading ridges would suddenly emerge from a single point in the Panthalassic Ocean 170 million years ago and begin migrating away in … Continue reading →

Posted in Asteroid Impacts, Geography, Geology, Pacific Triangle, Paleogeography, Plate Tectonics, Seafloor Isochrons | Tagged , | 4 Comments

Paving It Won’t Save It (The Planet, That is)

Posted on December 26, 2013 by gymnosperm

The oceans are the energy bank for the planet. They receive energy to great depth from the sun. Continents cool the planet. Daedalus suggested in jest that if we increased the area of the continents 5%, we could reverse the … Continue reading →

Posted in Climate, Geography, Geology, Global Warming, Plate Tectonics, Serpentine | Tagged , , | Leave a comment

The Pacific Triangle

Posted on November 24, 2013 by gymnosperm

The triangle is formed by lines of equal age in the ocean floor derived from bands of alternating magnetism as the earth’s pole flipped. It is one of the great mysteries discussed previously. The ocean floor gets progressively older from all … Continue reading →

Posted in Geography, Geology, Pacific Triangle, Paleogeography, Plate Tectonics, Seafloor Isochrons | Tagged , , , , | 3 Comments

Serpentine and the Primordial Subduction

Posted on October 19, 2013 by gymnosperm

Serpentine is the California State Rock. The effluent of toxic mud volcanos might seem a strange choice for a state rock, but the related higher grade blue and greenschist metamorphism has produced eerily beautiful rocks with sinuous veining from which … Continue reading →

Posted in Geology, Plate Tectonics, Serpentine | Tagged , , | Leave a comment

Yellowstone Hot Spot, Or Not

Posted on October 12, 2013 by gymnosperm

Besides the ocean spreading ridges there are several mysterious “hot spots” evident in seamount chains where volatile components of the mantle emerge at a point as a more or less continuous volcano. The most famous of these is the Hawaiian/Emperor … Continue reading →

Posted in Geography, Geological Evolution of the Western United States, Geology, Paleogeography, Plate Tectonics | Tagged , , | Leave a comment

Late Cretaceous Orogenic North American Continental Margin

Posted on September 22, 2013 by gymnosperm

A huge problem with geological maps is that their daunting psychedelic maze of colors makes it very difficult to bear down on specific features. We recently discovered a GIS series of State scale maps from USGS  where it is possible to … Continue reading →

Posted in Geography, Geology, Gravity Anomalies, Paleogeography, Plate Tectonics | Tagged , , | 1 Comment

Gravity Signals of Extensional Sialic Crustal Regimes

Posted on September 15, 2013 by gymnosperm

I have always loved the poorly named Great Basin of the Western United States. Yes, its maze of lowlands held a lot of glacial meltwater during the last glacial maximum before letting it percolate out to the Columbia and the Sea … Continue reading →

Posted in Geography, Geoid, Geology, Gravity Anomalies, Plate Tectonics | Tagged , , , , , , , | Leave a comment

Wild Idea #6743: Possible Impact Signatures in Seafloor Isochrons

Posted on June 22, 2013 by gymnosperm

Who knows from what depths the well of ideas flows? For me it is often during the liberation of rote manual work that frees some bandwidth while still requiring a minimal level of focus and blood flow to the brain. … Continue reading →

Posted in Asteroid Impacts, Geography, Geology, Magnetic Reversals, Paleogeography, Plate Tectonics, Seafloor Isochrons | Tagged , , , , | Leave a comment

Hawaii

Posted on March 3, 2013 by gymnosperm

By incredibly good luck I’ve been spending lots of time in Hawaii lately, on business no less. I stay in this unbelievable house.   One really gets the sense of being out in the middle of the ocean in Hawaii, … Continue reading →

Posted in Geography, Geoid, Geology, Gravity Anomalies, Oceanography, Plate Tectonics | Tagged , , , | 1 Comment