Cratons

These old floating pieces of the lithosphere, called cratons, apparently stopped growing about 2 billion years ago as the Earth cooled, though within the last 500 million years, and perhaps for as long as 1 billion years, the modern era of plate tectonics has added new margins to the original cratons, slowly expanding the continents. ❋ Unknown (2010)

These places are not on old rock structures called cratons, and most of the world's better diamond propositions are in cratonic areas-southern and central Africa, northern or northwest Canada, Brazil, Eastern Siberia, a bit of Australia and Karelia in Finland. ❋ Unknown (2008)

Areas of lower projected hazard potential are associated with mountainous terrain and cratons (geologically stable interior portions of continents) where bedrock is at or near the surface. ❋ Unknown (2009)

The old cratons, stable interior sections of the continental crust, are thicker and have high magnetic mineral content. ❋ Unknown (2007)

These features are often located on the edge of cratons. ❋ Unknown (2007)

Prior to this period, the North American continent saw several periods of very active growth with the amalgamation of once distinct cratons and the addition of rock along its margins. ❋ Unknown (2007)

Both of these topographic features are often associated with cratons and their exposed shield and platform surfaces. ❋ Unknown (2007)

Tectonic collisions and plate subduction caused the accretion of these deposits at the edges of the continental cratons. ❋ Unknown (2007)

Most of the Earth's continental cratons have been tectonically stable and have experienced little deformation for hundreds of millions of years. ❋ Unknown (2007)

Eurasia is composed several distinct cratons that are separated from each other by the Alps, Ural, and Himalaya mountain belts. ❋ Unknown (2007)

Around the edge of the continental cratons are the continental margins. ❋ Unknown (2007)

These units are cratons, mountain belts, and continental margins. ❋ Unknown (2007)

Stabilization of most modern cratons, possible mantle overturn event ❋ Unknown (2005)

The microcontinents with cratons and igneous formations are pretty well mapped. ❋ May, Julian, 1931- (1998)

Most gem-quality diamonds are 1 billion to 3.5 billion years old, and originate at shallower depths, in the keels beneath the cratons, the ancient blocks of rock that form the hearts of the earth's continental masses. ❋ By NICHOLAS WADE (2011)

These results are most consistent with the conclusion that lithospheric loss was initially triggered by extension that followed the collision between the Sino-Korean and Yangtze cratons. ❋ Unknown (2010)

Ancient cratons, characterized by thick lithospheric-mantle roots, are stable and normally unaffected by later magmatism or tectonic activity. ❋ Unknown (2010)

As for how this improves the odds of finding these precious gems, Burke explained that geologists interested in diamonds have known for more than 50 years that rare diamond-bearing kimberlite volcanic rocks are highly concentrated in ancient cratons within areas of the ❋ Unknown (2010)

The new work has shown that most of the kimberlites have been erupted into one or the other of those old cratons only under certain conditions. ❋ Unknown (2010)

"That teacher is such a craton giving out two [essays] to do in the same week; he pretty much sucks [decrepit] [monkey] wenises." ❋ Senator (2007)

[You hit] that shit like [craton], [true g]. ❋ Dogdog1234568 (2021)