A Petrologic Study of the Hydrothermal Alteration and Ore Mineral Deposition in Drill Core Samples from Agrokipia, Cyprus.
| dc.contributor.author | Botros, Mona | |
| dc.date.accessioned | 2022-11-29T19:40:31Z | |
| dc.date.available | 2022-11-29T19:40:31Z | |
| dc.date.issued | 1983-03-15 | |
| dc.description.abstract | The effects of hydrothermal alteration and ore mineralization were studied in 34 basalt drill core samples from the Agrokipia Cretaceous seafloor hydrothermal system in Cyprus. Transmitted and reflected light microscope, X-ray diffraction and electron microprobe techniques were employed to determine the variation of secondary minerals and textures with depth. The depth intervals examined were the 24.00 m to 92.85 m interval in hole CY-2 and the 136.70 m to 406.85 m interval in hole CY-2A. These intervals represent the most altered sequences of the cores. The four stable secondary mineral assemblages which occur in the samples studied are: smectite + green chlorite + minor quartz + hematite in relatively fresh to partly altered basalt (in CY-2 samples and in CY-2A between 136.70 m and 150 m) chlorite (green and brown) + smectite + pyrite + sphalerite + chalcopyrite in highly mineralized and partly to highly altered basalt (CY-2A 150 m to 170 m) illite + quartz + sphene + pyrite + hematite in highly to pervasively mineralized and pervasively altered basalt (CY-2A 170 m to 300 m) abundant green and brown chlorite + albite + epidote + minor pyrite + trace sphalerite in partly mineralized and highly to pervasively altered basalt (CY-2A 300 m to 406.85 m) With the exception of the 30 m to 60 m interval, it appears that hole CY-2 did not penetrate any hydrothermally altered basalts while the 150 m to 300 m interval in hole CY-2A represents the most intense hydrothermal activity. Microprobe analyses revealed the occurrence of Mn-rich chlorite and calcite with the highest Mn content in the chlorite of sample CY-2 92.85 and the calcite of sample CY-2A 153.25. The MnO values of the chlorites in hole CY-2A appear to increase with depth while those of calcite decrease with depth. In all cases, the vesicle chlorites contained higher levels of MnO than the matrix chlorites. Keywords: Pages:121 Supervisor: James Hall | en_US |
| dc.identifier.uri | http://hdl.handle.net/10222/82096 | |
| dc.title | A Petrologic Study of the Hydrothermal Alteration and Ore Mineral Deposition in Drill Core Samples from Agrokipia, Cyprus. | en_US |
| dc.type | Report | en_US |