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Anorthosite-related nelsonite occurs mainly as veins and lensoidal intrusions in anorthosite complex or wall rocks. [7] The Fe–Ti–P-rich magma liquids formed immiscible and eutectic mixtures crystallizing around 850-1,000 °C followed by intense fractionation.
Using X-ray crystallography, the structure of Pt 2 [(Me 2 SiCH=CH 2) 2 O] 3 has been confirmed. Each Pt(0) center is surrounded by three alkene ligands provided by three 1,1,3,3-tetramethyl-1,3-divinyldisiloxane ligands. The Pt center and six coordinated carbon atoms are approximately coplanar, as found for simpler complexes such as Pt(C 2 H 4 ...
The subduction of bathymetric highs such as aseismic ridges, oceanic plateaus, and seamounts has been posited as the primary driver of flat slab subduction. [3] The Andean flat slab subduction zones, the Peruvian slab and the Pampean (Chilean) flat slab, are spatially correlated with the subduction of bathymetric highs, the Nazca Ridge and the Juan Fernandéz Ridge, respectively.
It spans eastern, northeastern, and east-central Canada and the upper midwestern United States. The Canadian Shield ( French : Bouclier canadien [buklje kanadjɛ̃] ), also called the Laurentian Shield or the Laurentian Plateau , is a geologic shield , a large area of exposed Precambrian igneous and high-grade metamorphic rocks .
The North American plate is a tectonic plate containing most of North America, Cuba, the Bahamas, extreme northeastern Asia, and parts of Iceland and the Azores.With an area of 76 million km 2 (29 million sq mi), it is the Earth's second largest tectonic plate, behind the Pacific plate (which borders the plate to the west).
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The states of Guerrero and Oaxaca lie above the convergent boundary where the Cocos plate is being subducted below the North American plate at a rate of 6.4 cm/yr (2.5 in/yr). The dip of the subducting slab is about 15° as defined by focal mechanisms and hypocenters of previous earthquakes.
Canada has ten provinces and three territories that are sub-national administrative divisions under the jurisdiction of the Canadian Constitution.In the 1867 Canadian Confederation, three provinces of British North America—New Brunswick, Nova Scotia, and the Province of Canada (which upon Confederation was divided into Ontario and Quebec)—united to form a federation, becoming a fully ...