1 / 23

Sudbury

Sudbury. Geology Ore Types Composition of SIC Features common to all deposits. Sudbury. All photos and maps from Doreen Ames’ on-line GSC description of the Sudbury area. Types of deposits. Footwall Contact Offset Other terms: North range and South range. North Range.

margie
Download Presentation

Sudbury

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Sudbury • Geology • Ore Types • Composition of SIC • Features common to all deposits

  2. Sudbury All photos and maps from Doreen Ames’ on-line GSC description of the Sudbury area.

  3. Types of deposits • Footwall • Contact • Offset • Other terms: North range and South range

  4. North Range

  5. Also in the North Range

  6. Features common to all • 1. Embayments or other irrigularities at the base of the SIC • 2. All spatially related to the sublayer • 3. Cu_Ni mineralization occurs only with sublayer that have ultramafic inclusions within the sublayer host 4. Source of S Delta S34 is -0.2 to 5.9 per mil—mantle source

  7. Composition of SIC—highly contaminated magma • 1. REE profiles • 2. Mg #’s • 3. Rocks of SIC are very siliceous when judged on the basis of Mg/Mg+Fe ratios of pyroxene • 4. unusually LARGE # of sulfide deposits • 5. Pb isotopes • Remind students about history here!

  8. 1. REE profiles

  9. Talk about 2, 3, 4 2. Mg #’s 3. Rocks of SIC are very siliceous when judged on the basis of Mg/Mg+Fe ratios of pyroxene 4. unusually LARGE # of sulfide deposits

  10. 5. Pb isotopes

  11. Impact Sheet • Melting of crust—all kinds of rocks, thus “contaminated” magma (1 km thick)

  12. Dumping SiO2 and S saturation

More Related