HSDP Drill Site HSDP - a detailed look at the Hawaiian plume (and CMB?)

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Presentation transcript:

HSDP Drill Site HSDP - a detailed look at the Hawaiian plume (and CMB?)

(Sharp et al., 2004)

edge center Melting region Sampling issues: Pt. 1 EPR MORB range

r = 130 km r = 30 km

MORB

Sr He The isotopic stratigraphy at the base of the mantle is not simple

Sr He The isotopic stratigraphy at the base of the mantle is not simple Jellinek & Manga (2002)

186 Os data also interpreted as entrained outer core material; correlates w/ 3 He Brandon et al. (1999)

(R. Walker et al. 1997; Brandon et al. 1998; Meibom & Frei 2002) Re, Os, Pt and core-mantle interaction? Observations: high values of 186 Os/ 188 Os and 187 Os/ 188 Os in Hawaiian lavas, Siberian lavas, and Os-rich alloys Hypothesis: Entrainment of ~1 wt% outer core material in plume Depends on: Inner core-outer core partition coefficients for Re, Os, Pt Inner core Outer core mantle crust ReOsPt

(Brandon et al. 1998; Shen et al.1996; D.Walker 2000) Re, Os, Pt systematics Inner core Outer core mantle crust ReOsPt ReOsPt high Re/Os high Pt/Os high 187 Os/ 188 Os high 186 Os/ 188 Os high 187 Os/ 188 Os 187 Re  187 Os 190 Pt  186 Os outer core = only reservoir with high 187 Os/ 188 Os and 186 Os/ 188 Os Std gchems story

Mauna Loa data suggest that core of plume is longitudinally heterogeneous

Recent deviant lavas from Mauna Loa require longitudinal heterogeneity along the axis of the plume

The axial part of the plume is longitudinally heterogeneous; The inner fringe of the plume is less heterogeneous The outer fringe is invisible (no melting)

Conclusions Different isotopic anomalies are not spatially correlated in the lowermost mantle The 3 He anomaly is not a general feature of the “lower mantle” but is a feature of the base of the mantle Most of the mantle between the plume source and the surface could have R/Ra ≈ 8; however, there are no lavas to represent this entrained material The Sr isotope anomaly ( 87 Sr/ 86 Sr ≈ ) at Hawaii is a broad feature and the isotopic composition could represent a large volume of the lower mantle under Hawaii Patterns for Hf, Nd, Os resemble Sr; but 208 Pb resembles 3 He Juxtaposing isotopic data with physical models can yield new perspectives