OF CARBONATE-HOSTED LEAD-ZINC DEPOSITS OF THE KOOTENAY ARC ( 82 FEast Half )
Fieldwork for this study consisted of a preliminary investigation and sampling of carbonate-hosted lead-zinc deposits within the Kootenay arc. Lead isotope data from galena were also determined at The University of British Columbia. Carbonate-hosted lead-zinc deposits in the Kootenay arc have been characterized as either concordant or transgressive types based on field characteristics (Fyles, 1966). In general, the transgressive mineralization occurs as vein or replacement deposits that are enriched in silver. The concordant deposits are stratiform  and  contain  a  simple  base metal sulphide mineral suite with little or no precious metals. The concordant deposits have also been referred to as the Salmo or Remac-type, after several large deposits in the Salmo camp. Lead isotope data from deposits in the Kootenay arc have been used to interpret and explain the source of lead and the ore-forming processes responsible for these deposits. Lead isotope plots for the Remac-type deposits do not conform to lead growth curves constructed for lead-zinc deposits from this region, nor can they be adequately interpreted as the result of lead mixing or lead inheritance. A thorough analysis and comparison of the ore and gangue mineralogy, stratigraphy, and trace element and isotope geochemistry from these conformable Remac-type deposits and the younger Metaline-type deposits will provide an improved understanding of the regional ore-forming process.
Mixing line isochrons; a new interpretation of galena lead isotope data from southeastern British Columbia
Ainsworth Bluebell, Slocan, and Moyie camps. Mixing of lead from two different sources, both of which follow simple growth-curve lead evolution. The more radiogenic source is thought to represent evolution of lead in the upper crustal, continentally derived sedimentary rocks which host these deposits. The two-stage Bluebell growth curve provides an estimate of the uranium-poor lead source which may be the lower crust, the upper mantle, or a mixture of both. Mixing line isochrons drawn between these two curves at ages corresponding to the best estimates for the mineralization ages at these three mining camps closely fit the lead isotope data. This supports the age estimates for all three camps and, in particular, substantiates a Lower Cambrian age for the original mineralization in the Ainsworth and Bluebell deposits. Mixing is assumed to take place at the time of mineralization and may be attributed to magmatic activity in the Moyie and Slocan camps. Applicability of the model to a large part of the Omineca Belt. May be used to date both epigenetic and syngenetic or penecontemporaneous deposits of unknown age.--Modified journal abstract.
Study of External Parasites Infesting Carcharhinus Melanopterus Fish From The Red Sea In Jeddah, Saudi Arabia
Parasitic diseases are harmful and limiting factors in breeding and rearing ornamental fish industry, such as the Monogenea ( Dactylogyrus sp and Erpocotyletiburonis ) and copepod ( Pandarus sinuatus  and Anchistrotostangi ). The copepod and the monogenean are gill parasites found on the shark; CarcharhinusMelanopterus . The primary purpose of this study was to determine the parasitic infections of sharks in red sea in Jeddah. For this purpose, 19 female C. Melanopterus and 14 male C. Melanopterus were first examined for ectoparasites using wet mount under a light microscope. All male sharks had Monogenea and/or copepod in their gill and only 3 females haven’t infections. Then, we aimed to find a combination of copepod and monogenea infection in C. Melanopterus gills. 50% of male and 42% of female were infected by copepod and monogenea. Our findings revealed that the protozoan infections are very common among sharks. Although, no gross pathology was observed among infected shark, but it is likely that in case of any changes in the environment, then parasitic infections could be harmful.