Selected Major Elements Content in Igneous Rocks of Paraguay by Neutron and X-ray Irradiation
Selected Major Elements Content in Igneous Rocks of Paraguay by Neutron and X-ray Irradiation作者机构：Comision de Energia Atomica Universidad Nacional de Asuncion Campus Universitario Charles de Gaulle 980
出 版 物：《Journal of Earth Science and Engineering》 (地球科学与工程（英文版）)
年 卷 期：2013年第3卷第6期
页 面：411-415页
学科分类：081901[工学-采矿工程] 0709[理学-地质学] 081803[工学-地质工程] 0819[工学-矿业工程] 07[理学] 08[工学] 0818[工学-地质资源与地质工程]
主 题：Magmatism in Paraguay activation with Am-Be source XRF in rocks rock classification IUGS recommendations.
摘 要：Plutonic and volcanic rocks were analyzed by INAA （Instrumental Neutron Activation Analysis） ana XRF （X-ray flurescence） in their major components for its classification. The samples proceed from the sites/regions corresponding to the Precambrian to Paleozoic/Postpaleozoic magmatism in the eastern and western Paraguay. The analysed elements were Si, A1, Na and K and thus the SiO2, AI/O3, Na2O and K2O content determined. The activation were performed in an annular 25Ci Am-Be neutron source with total flux of 5×10^7n.s^-1. The reactions used were （1） ^28Si （n, p） ^27A1, （2） ^27A1 （n, p） ^27Mg; （3） ^23Na （n, γ） ^24Na, the fourth element of interest, potassium, was analysed by XRF. The procedure overall uncertainties were checked as per the analysis of three compositae samples of SiO2： ＋ A12O3 ＋ NaHCO3 ＋ K2CO3 prepared as standards in convenient proportions. The determination of these parameters according to the last recommendations of the IUGS （International Union of Geosciences）, permits the classification of the rocks in the categories acid, intermediate, basic and ultrabasie, as well as the identification of the rock family and in certain cases, the norm and their magmatic provenance.
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