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The gold is hosted in various supracrustal rock units and is spatially, and possibly genetically, associated with a major shear zone/terrane boundary. Diamond drilling and chip sampling have revealed economic grades over minable widths. The mineralization is conveniently located near ice-free waters ...
Overall, through an 20km thick section of crust, there is a general increase in whole-rock δ 18 O value with increasing depth. This is the reverse of what is normal in the crust, largely because the collar rocks have δ 18 O values that are unusually low in comparison with ...
用作形容词(adj.) The Archaean and Katarchaean units are preserved mainly as relic masses 太古界与远太古界主要作为残余体保存下来。 用作名词(n.) But simulation rock composition of the Archaean can form granite if partial melting grade is high. ...
Archaean 美[ɑrˈkiən] 英[ɑ:ˈki(:)ən] adj.【地质学;地理学】太古代的;太古代岩石的 n.【地质学;地理学】太古代;太古代岩石 网络太古宙;太古宇;前太古代 英汉 英英 网络释义 n. 1. 【地质学;地理学】太古代;太古代岩石 adj. ...
Abyssal peridotites > 3,800 Ma from southern West Greenland: field relationships, petrography, geochronology, whole-rock and mineral chemistry of dunite and harzburgite inclusions in the Itsaq Gneiss Complex. Contrib. Mineral. Petrol. 143, 71–92 (2002). Article ADS CAS Google Scholar Nutman...
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melting event that formed the host rock. Witwatersrand Supergroup sedimentary rocks of the collar, which were metamorphosed at greenschist-to amphibolite-facies conditions, generally have lowerδ18O values than the core rocks with a mean value for metapelites of 7.7‰ (n= 45). Overall, through ...
However, more than 70% of amphibole from a granitoid wall rock would need to be assimilated to raise TiN/Ti* of a TTG melt by a factor of 2. This would produce a hornblendite rather than a TTG. Fractional crystallisation could have a more profound effect than assimilation. Melt ...