I-type granite

Fields of colllsional, A-type and I type granites are from Green 0995)... 

Chappell B. W. and Stephens W. E. (1988) Origin of infracrustal (I-type) granite magmas. Trans. Roy. Soc. Edinburgh Earth Sci. 79, 71-86. 

Soesoo A. (2000) Fractional crystallization of mantle-derived melts as a mechanism for some I-type granite petrogenesis an example from the Lachlan Fold Belt, Austraha. J. Geol. Soc. London 157, 135-149. 

The rocks of the TCZ are interpreted to have erupted in a transtensional continental rifting environment in the Late Siiurian to Middle Devonian. In this tectonic environment A-type granites are expected, and indeed the reiativeiy high Zr, Nb, and Y content in these rocks support this. However, many other geochemicai aspects of these rocks, i.e., high Ba, Rb, Th and K, are more typical of the I-type magmas that commonly occur in collisional settings. 

Fig. 3. Nb vs. Nb/Ta discrimination diagram with TCZ rhyolites plotted with respect to fields for A-, I-, and collision-type granites.

Chappell B. W. (1999) Aluminium saturation in I- and S-type granites and the characterization of fractionated haplogra-nites. Lithos 46, 535—551. 

Waight T. E., Maas R., and Nicholls I. A. (2000) Fingerprinting feldspar phenocrysts using crystal isotopic composition stratigraphy implications for crystal transfer and magma mingling in S-type granites. Contrib. Mineral. Petrol. 139, 227-239. 

Graham IJ, Palmer K (1987) New precise Rb-Sr mineral and whole-rock dates for I-type granitoids from Granite Harbor, south Victoria Land, Antarctica. New Zealand Antarctic Record 8(l) 72-80... 

S-type granites, granodiorite containing hornblende and biotite, quartz monzonites, and alaskite (i.e., alkali-rich quartz-feldspar granite). The lithologic composition of the clasts indicates that volcanic and plutonic rocks were exposed to weathering and erosion a short distance from the site of deposition in the Bowers basin. 

The Granit s works drew the attention of researchers to the different kind of ERG that of nocturnal animals (like the rat) of the E type and that of diurnal animal of the I type. 

Blancaneaux, P. and Pouyllau, M. (1977). Formes d alteration pseudokarstiques en relation avec la geomorphologie des granites precambriens du type Rapakivi dans le territoire Federal de I Amazone, Venezuela. Cah. ORSTOM Ser. Pedol. 15,131-142. 

Supergroup. The principal rock-types in the intrusion are syenites, granites and gabbros, and associated pegmatitic bodies hosting rare metal mineralization. Five distinct zones of rare metal mineralization have been identified as potentially economic. The Lake Zone is one of them and is characterized by its enrichment in the more valuable HREE (Eu, Tb, and Dy), relative to light rare earths (LREE, i.e.. La and Ce) (Palmer Broad 2007). 

There are two types of caverns used for storing liquids. Hard rock (mined) caverns are constructed by mining rock formations such as shale, granite, limestone, and many other types of rock. Solution-mined caverns are constructed by dissolution processes, i.e., solution mining or leaching a mineral deposit, most often salt (sodium chloride). The salt deposit may take the form of a massive salt dome or thinner layers of bedded salt that are stratified between layers of rock. Hard rock and solution-mined caverns have been constructed in the United States and many other parts of the world. 

Although many authors insist upon the sequential degradation of phyllosilicates, i.e., taking the same initial material and transforming it into the various types of expandable minerals in the weathering process, (Heaver and Jackson, notably) this is undoubtedly not the only mechanism by which these clay minerals are formed in soils and possibly not the dominant one. Studies on the weathering of granites and more basic rocks... 

Wyborn L. A. I., Wyborn D., Warren R. G., and Drummond B. J. (1992) Proterozoic granite types in Austraha impheations for lower crust composition, structure and evolution. Trans. Roy. Soc. Edinburgh Earth Sci 83, 201-209. 

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