1 n morb 01 depleted mantle primitive mantle 001

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Unformatted text preview: , 12 .1 1 Sediment Provenance 10 PASC 1 UCC GLOSS BCC La/Ni .1 LCC N-MORB .01 .001 Primitive Mantle .0001 Depleted Mantle Chondrite .00001 .000001 .00001 .0001 .001 Th/Ni Monday, 13 August, 12 .01 .1 1 Sediment Provenance Th A - Intraoceanic Arc B - Continental Arc C - Active Cont. Margin D - Passive Margin C B D A Sc From Bhatia and Crook (1986) Monday, 13 August, 12 Zr/10 Sediment Provenance 20 N-MORB N-MORB Nb/Th Nb/Th Depleted Depleted Mantle Mantle 10 Chondrite/PrimitiveChondrite/Primitive Mantle Mantle PASC LCC LCC 0 0 1 BCC GLOSS 2 BCC PASC GLOSS UCC 3 10 4 La/Sm Th Monday, 13 August, 12 5 UCC 6 7 20 Sediment Provenance 20 N-MORB Nb/Th Depleted Mantle 10 Chondrite/Primitive Mantle PASC LCC BCC GLOSS UCC 0 0 1 2 3 4 La/Sm Monday, 13 August, 12 5 6 7 Case Study: Hidden Fm., Flin Flon (Modified from Syme et al. 1996) 1 Km Monday, 13 August, 12 From Tardif (2004) Sampling • Epidote/quartz patch 30cm 30cm Monday, 13 August, 12 Interpillow VSR epidotized and silicified Volcanic sedimentary rocks (VSR) From Tardif (2004) VSR Provenance (Tardif, 2004) • Used ratios of immobile trace elements - less effected by hydrothermal alteration. • • • Felsic component - La and Zr Mafic component - Co, Sc and V Ratios Used: • Felsic sediment - La/Sc and Zr/Sc • • Mafic sediment - Co/Zr, Sc/La, Sc/Zr • Monday, 13 August, 12 High values = more felsic component High values = more mafic component Provenance - DDH4Q77 • All REE+Hf+Y, Zr decrease and Co, Cr,V, Sc increase up stratigraphy. -> Decreasing felsic provenance up section. -> up to ~250 m into the hanging wall. From Tardif (2004) Monday, 13 August, 12 Provenance Surface Samples From Tardif (2004) Provenance Diamond Drill Holes Monday, 13 August, 12 Case Study: Hidden Fm, Flin Flon: Summary • • Deposits are associated with felsic rocks. • As one approaches ore the La/Sc, Zr/Sc increase and Co/ Zr decrease. • Identified zones up to 250m into hanging wall. Monday, 13 August, 12 Hangingwall sediments were used to monitor relative contributions from felsic (high La/Sc, Zr/Sc) versus mafic (high Co/Zr) sources. Pericratonic Assemblages From Colpron et al. (2006) Monday, 13 August, 12 From Colpron et al. (2006) Monday, 13 August, 12 From Colpron et al. (2006) Monday, 13 August, 12 Snowcap Complex • • From Colpron et al. (2006) Monday, 13 August, 12 Basement complex Pre-Devonian age Garnet schist – Snowcap Mtn Snowcap Complex Calcareous psammite – Tummel Hills Monday, 13 August, 12 • Predominantly psammitic schist, quartzite, calcsilicate rock Snowcap Complex Calcareous psammite – Tummel Hills Psammite – Ess Hill Monday, 13 August, 12 • Predominantly psammitic schist, quartzite, calcsilicate rock Snowcap Complex • Monday, 13 August, 12 Distal continental margin rocks ?? Sediment Geochemistry Upper crust values from McLennan (2001) Monday, 13 August, 12 Sediment Geochemistry Monday, 13 August, 12 Nd-Hf Isotopes Mixture of juvenile and evolved components Monday, 13 August, 12 Case Study: Snowcap Assemblage: Summary • Sediments came from upper crustal sources with some mafic detritus. • Isotopic and geochemical data consistent with derivation from northern Cordilleran latitudes and not from southern latitudes. Monday, 13 August, 12 Shale Ge...
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This document was uploaded on 03/06/2014 for the course ES 4502 at Memorial University.

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