Sonic project x love disaster complete save file 5.5

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Stages of rifting between Greenland and Canada during the Were emplaced following regional donning and during the initial With fundamental fracture systems, such as in the Lesotho and In addition, kimberlites are commonly spatially associated They are the only intracratonic igneous rocks indubitably as. Tivity associated with epeirogeny, but in many cratonic settings Kimberlites are not the only products of igneous ac. In which kimberlites occur are also those of epeirogenic crustalДoming. Bailey (1964) observed that these regions Precambrian dikes of 'metakimberlite' in Ivory Coast and Ga-Д«on, Africa, that ostensibly contain diamonds. (1981) proposed that Pre-Д¬ambrian dikes of graphitic schists in western Africa are meta.

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Namic metamorphism this strengthens the argument that theyДevelop in or near stable cratons, free from subsequent dias. In fact, I am un-ДЄware of any kimberlites that show the effects of regional, dy. In Virginia, Tennessee, and Arkansas and around the KaapvaalД¬raton in southern Africa, but there is no evidence that theseДЄre other than postorogenic (Dawson, 1980). Occur in the folded belts surrounding the cratons, such as those Kimberlites are concentrated in stable cratonic regions of The larger diamonds are kimberlite provinces the smaller diamonds Southeastern Australia would not qualify.ДЇIGURE 1.1 Distribution of kimberlites (modified from Dawson, 1980). If the stringent definition of Skinner and Clem-Д®nt (1979) is used, the pipes on the Colorado Plateau and Kimberlite is difficult to define, and a liberal interpretation isДЄdopted here. Magmas and shed light on the mantle source regions. If such temporal and spatial constraints can be establishedДЇor explosive alkaline volcanoes, such as kimberlites and alkaliД«asalts, this will place restrictions on the origin of alkaline Mantle temperatures than have prevailed in post-Archean time Has been interpreted as evidence for much higher crustal and Restriction of most peridotitic komatiites to Archean terranes System and perhaps to the inception of the process of modern. Provides clues to the cooling and evolution of the crust-mantle Late Proterozoic time in two large arcuate belts (Herz, 1969) Sifs, perhaps with attendant rhyolitic lavas and granites, during The emplacement of the enormous volumes of anorthosite mas. On the mechanisms by which such rocks originate. Sufficiently constrained in space and time, provides information

The distribution of extrusive and intrusive igneous rocks, if The time interval between metasomatism and generation of magma might be short, as witnessedД«y the inception of alkali basalt magmatism all along the Pacific Coast of North America less than 10 m.y. It seems clear that H2O, Fe, Ti, and LIL elements such as K and LREE are among the most mobileД¬omponents. That of a heterogeneous mantle proposed from petrographic, chemical, and isotopic studies of xenoliths andД«asalts. The concept of a metasomatic fluid enriching the source regions of these alkaline rocks is consonant with Subduction of topographic features such as ridges and transform faults. Source regions of these rocks was caused by warping of the crust and underlying mantle as the result of Most of these basalts wereД®mplaced in active orogenic environments associated with subduction. In contrast, alkali basalts that contain mantle-derived xenoliths appear to be restricted to the PhanerozoicД®on, with the vast majority of known occurrences being less than 5 m.y. The source regions appear to have drifted coherently with the continents. That was enriched by metasomatic fluids, the ingress of which appears to have been triggered by epeirogenicД¬rustal and mantle doming. AbundantД¬hemical and isotopic data support the concept that kimberlites originate from a source region in the mantle Phanerozoic eons, but they are restricted to Precambrian shield areas and surrounding fold belts. Kimberlites erupted throughout most or all of the Proterozoic and The spatial and temporal distributions of kimberlites and alkali basalts provide information on the mechanismsД«y which these important rocks originate. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages. Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book.