Category Archives: Plate Tectonics

The Pacific Triangle

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

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

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Yellowstone Hot Spot, Or Not

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

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

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

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Wild Idea #6743: Possible Impact Signatures in Seafloor Isochrons

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

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

California Great Central Valley as a Cretaceous Sea of Cortez

I was travelling the world as I often do in Google Earth, pondering how strange it is that the Hawaiian Seamount chain created a gravity low its entire length, when I noticed this: Probably just because gravity lows are a nice deep … Continue reading

Posted in Geography, Geology, Gravity Anomalies, Paleogeography, Plate Tectonics | Tagged , , , , , , | 4 Comments

Ring Around Antarctica

There are lots of rings around Antarctica. Sailors know the circum-Antarctic winds as the fearsome fifties, the screaming sixties, etc. These winds are not impeded by any land and they drive the circum-Antarctic currents in the Southern Ocean. The surface currents … Continue reading

Posted in Geography, Paleogeography, Plate Tectonics, True Polar Wander | Tagged , , , , , , , | 4 Comments

Seafloor Isochrons Place a Hard Limit on Crustal Disintegration from the Chicxulub Impact

I always thought the entire form of the Gulf of Mexico might be the crater from the Chicxulub impact reputed to have wasted the dinosaurs. My imagination runs with that name. So much to work with. Chicxyclub…well, Club Med impact … Continue reading

Posted in Asteroid Impacts, Geography, Geology, Magnetic Reversals, Oceanography, Plate Tectonics | Tagged , , , | 1 Comment