Geochemistry of the low‐grade Early Proterozoic sedimentary sequence in the Pine Creek Geosyncline, Northern Territory
| Autor: | I. H. Crick, G. R. Ewers, R. S. Needham, P. G. Stuart‐Smith |
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| Rok vydání: | 1985 |
| Předmět: | |
| Zdroj: | Australian Journal of Earth Sciences. 32:137-154 |
| ISSN: | 1440-0952 0812-0099 |
| DOI: | 10.1080/08120098508729320 |
| Popis: | The geochemistry of Early Proterozoic sedimentary rocks from the low‐grade metamorphic terrain W of the South Alligator Hinge Zone in the Pine Creek Geosyncline is reported and discussed in terms of the stratigraphy and differences in rock type. Major element trends are dominated by lithological and mineralogical variations; in particular, the dolomitic nature of pelites in the Mount Partridge and Namoona Groups, the presence of chlorite in Crater Formation pelites, and the volcanic affinity of pelites within the Gerowie Tuff. Concentration of Th, U, Zr, Y, Nb, Ce and La in the clastic sediments of the Finniss River and South Alligator Groups is probably related to the presence of felsic volcanics in these groups; high levels of Sn in these groups may be similarly related, and highlight the apparent volcanogenic source for this metal. The South Alligator Group is a preferred host for base‐metal mineralization, and the regional abundance of several metals in this group enhance its economic potenti... |
| Databáze: | OpenAIRE |
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