Caesium as a possible discriminant between felsic rocks of different origins from eastern Australia
作者:
B. L. Gulson,
W. Godbeer,
期刊:
Journal of the Geological Society of Australia
(Taylor Available online 1979)
卷期:
Volume 26,
issue 1-2
页码: 11-15
ISSN:0016-7614
年代: 1979
DOI:10.1080/00167617908729062
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The use of Cs to discriminate between igneous rocks derived from an igneous’ protolith (I‐type) and those derived from a metasedimentary protolith (5‐type) is evaluated for selected eastern Australian granitic and felsic volcanic rocks. For this investigation a ‘flame emission’ technique has been developed and tested for the rapid determination of Cs in rock samples. In the Berridale Batholith, where theI‐type, 5‐type subdivision was first recognized, the Cs content of the granites clearly distinguished the two granite types. In the New England Batholith the leucocratic 5‐types have higher Cs abundances, in most cases, than the similarI‐type granites, but the Cs values of the more mafic 5‐type granites overlap those of theI‐type. Problems in assigning origins for volcanics are complicated by alteration, but Cs may be useful in distinguishing reworked tuffs from volcanic rocks in volcanic sequences. Caesium may also find application in distinguishing volcanics and sediments in Precambrian terrains.
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