U_Pb_Geochronology

From heaman and parrish 1991 and richards and noble

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: , GN = granitic gneiss, PS = pelitic schist, SK = skarn. From Heaman and Parrish (1991) and Richards and Noble (1998) Wednesday, 15 August, 12 How do we get those minerals and analyze them? Wilfley Table Crush in jawcrusher Grind in disc mill Rock fragments Sand Picking under microscope Franz (magnetic) separation Heavy liquids Zircon fractions (based on clarity, colour, morphology, etc.) Least magnetic heavy minerals Heavy Minerals Bomb dissolution Column chemistry Dry onto filaments Analysis by TIMS Dissolves zircon under pressure Isolates U and Pb Puts U and Pb onto filaments ~50 kg sample from field Edges of zircon grains removed Grain mounts IN-SITU U-Pb GEOCHRONOLOGY analysis by SHRIMP or LA-ICP-MS Wednesday, 15 August, 12 Air Abrasion CONVENTIONAL U-Pb GEOCHRONOLOGY Interpretation and age Heavy minerals Interpretation and age How do we get those minerals and analyze them? Wilfley Table Crush in jawcrusher Grind in disc mill Rock fragments Sand Picking under microscope Franz (magnetic) separation Heavy liquids Zircon fractions (based on clarity, colo...
View Full Document

This document was uploaded on 03/06/2014 for the course ES 4502 at Memorial University.

Ask a homework question - tutors are online