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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 witnessedīy 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 mobileĬomponents. That of a heterogeneous mantle proposed from petrographic, chemical, and isotopic studies of xenoliths andīasalts. 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 wereĮmplaced in active orogenic environments associated with subduction. In contrast, alkali basalts that contain mantle-derived xenoliths appear to be restricted to the PhanerozoicĮon, 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 epeirogenicĬrustal and mantle doming. AbundantĬhemical 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 mechanismsīy 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.

Sonic project x love disaster complete save file 5.5 download