EPSC 445 Lecture 2: min dep 1119.docx

• School: McGill University
• Department: Earth & Planetary Sciences
• Course: EPSC 445
• Professor: Anthony E Willia- Jones

Document Summary

11/19 min dep: crude oil transporting mineral, composition of aqueous fluid. +50~-50~60: we know that sulphate likes heavy isotope, reduced sulphur likes light isotope, sedimentary sulphide is negative in numbers, getting sulphur from sed. From shale basins; shale enriched in metals like lead and zinc. Digeneti sedimentary sulphide that are negative in source. Sulphur coming from shale basins we see negative value but generally positive value. Standard model: sedimentary basins deeply buried below the sea water surface. Back reet facies has sulphur in oxidized form, in sulphate in evaporate. Our positive value in different deposits come from there. Metal comes from shale to reet and sulphur from back reet to reef. Oil moving thru and sulphate hits oil then- >oxidizing to make reduced sulphur s+6 to s -2: oil move to reservoir and sulphate so4 comes in from reet and gets reduced b. c of reacting with oil and the net result is sulphur reduced to h2s.