Printable Map Of The Edge Of Cratons

Printable Map Of The Edge Of Cratons Craton the stable interior portion of a continent characteristically composed of ancient crystalline basement rock The term craton is used to distinguish such regions from mobile geosynclinal troughs which are linear belts of sediment accumulations subject to subsidence i e downwarping The extensive central cratons of continents may consist

What is a craton A craton is a large coherent domain of Earth s continental crust that has attained and maintained long term stability having undergone little internal deformation except perhaps near its margins due to interaction with neighbouring terranes Stable continental crust is an end product of intense magmatic tectonic and metamorphic In this study we review the nature and origin of cratons on four well studied examples The Superior Province the Canadian Shield the Barberton Mountain Kaapvaal province South Africa and the Yilgarn province Western Australia show the diversity of rocks with different origin and metamorphic degree at their surface

A Global map showing the major Precambrian cratons B Outline of the north China craton and its position in China C Simplified geological map of the north China craton showing tectonic boundaries and outcrops of the Precambrian rocks and paleomagnetic sampling locations used in Table 11 1 and the reference point 38 N 110 E used

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Printable Map Of The Edge Of Cratons

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Craton Wikipedia

https://en.wikipedia.org/wiki/Craton
Craton Cratons of South America and Africa during the Triassic Period when the two continents were joined as part of the Pangea supercontinent A craton kre t n kr t n or kre t n 1 2 3 from Greek kratos strength is an old and stable part of the continental lithosphere which consists of Earth

4 11 Ancient Parts Of Continents Cratons And Shields

https://geo.libretexts.org/Bookshelves/Oceanography
Figure 4 33 Continental shields and cratons Continental shields contain the oldest rocks preserved in the cores of continental landmasses These regions formed by processes associated with continental accretion billions of years ago long before the continents of the modern world existed These ancient shield are part of the stable parts

Craton Formation And The Onset Of Plate Tectonics

https://www.underworldcode.org/articles/craton
The model cratons form cold and from material that was originally crystallised at shallow depth The formation is also a time of temperature inversion in the mantle cool material is dumped at the core mantle boundary resulting in higher than average core heat flux The phase of mobile lid convection that follows this analogous to plate

Deep Continental Roots And Cratons Nature

https://www.nature.com/articles/s41586-021-03600-5
The formation and preservation of cratons the oldest parts of the continents comprising over 60 per cent of the continental landmass remains an enduring problem Key to craton development is

Scouting Craton s Edge In Paleo Pacific Gondwana

https://www.usgs.gov/publications/scouting-cratons
The geology of the ice covered interior of the East Antarctic shield is completely unknown inferences about its composition and history are based on extrapolating scant outcrops from the coast inland Although the shield is clearly composite in nature a large part of its interior has been represented by a single Precambrian block

Cratons form the base of continents and hold the title of the oldest existing portion of the lithosphere They re extremely thick and began to form up to 3 billion years ago in the Archean eon Productive lead Pb zinc Zn and copper Cu mines line up with the edges of cratons where thinning lithosphere made sedimentary basins perfect for metal precipitation

Here we use a combination of gravity topography crustal structure and seismic tomography data to show that the deepest part of the craton root beneath the North American Superior Province has