|
| << vorige | volgende >> |
Tijdschrift beschrijving
Alle jaargangen van het bijbehorende tijdschrift
Alle afleveringen van het bijbehorende jaargang
Alle artikelen van de bijbehorende aflevering
Details van artikel 10 van 13 gevonden artikelen
| Titel: |
Stratabound phyllosilicate zones associated with syntectonic copper orebodies at Mt Isa, Queensland |
| Auteur: |
Swager, C. P. Perkins, W. G. Knights, J. G. |
| Verschenen in: |
Australian journal of earth sciences |
| Paginering: | Jaargang 34 (1987) nr. 4 pagina's 463-476 |
| Jaar: |
1987-12 |
| Inhoud: |
Three distinctive stratabound phyllosilicate zones are present at the margins of the syntectonic Mt Isa Cu orebodies and their host rock, the 'silica-dolomite', in northwestern Queensland. The zones show close spatial relationships with adjacent stratiform Pb-Zn ores within the overall host, the dolomitic Urquhart Shale. The Pb-Zn orebodies may be either sedimentary-exhalative or, as suggested recently, late diagenetic in origin, whereas the Cu ores were formed during the third regional deformation event. Talc-stilpnomelane layers within the footwall of the silica-dolomite, and biotite-rich layers at the margins and adjacent to the silica-dolomite are present in sideritic intervals within the dolomitic sequence. These Fe-carbonate-rich layers correlate with the Pb-Zn orebodies, but have a much greater lateral extent. Chloritic layers occur along the hanging wall contacts of several Pb-Zn orebodies with overlying silica-dolomite lobes. Microstructural and petrographic studies suggest that the phyllosilicates grew at the silicification stage during early syn-D3 alteration that also formed the silica-dolomite and its Cu orebodies. The stratabound distribution of talc, stilpnomelane and biotite is explained by the chemical control of the sideritic beds on silicification. The origin of the Fe-carbonates is not known and may be either sedimentary or diagenetic. The chlorite zones may have developed because of more extensive fluid-rock interactions controlled by higher permeabilities along the brittle shale and ductile galena layering within the Pb-Zn orebodies. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 10 van 13 gevonden artikelen
| << vorige | volgende >> |