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Question

Pb isotopic data from southern hemisphere shows compositional similarity to EM type of mantle reservoir is known as :

This question was previously asked in
MH SET 2024 Paper 2 Computer Science and Applications Question Paper (07-Apr-2024)
The correct answer is

DUPAL

Oceanic basalts from much of the southern hemisphere, especially the Indian Ocean and South Atlantic, plot above the Northern Hemisphere Reference Line on lead isotope diagrams.

They have high 208Pb/204Pb and 207Pb/204Pb at a given 206Pb/204Pb, together with high 87Sr/86Sr. This signature resembles the enriched mantle (EM I and EM II) reservoirs.

Hart (1984) named this large-scale southern hemisphere isotopic anomaly the DUPAL anomaly (after Dupré and Allègre, who first described it).

HIMU is a separate reservoir with very radiogenic Pb (high U/Pb), NHRL is only the reference line for northern hemisphere basalts, and FOZO is the common focal zone component of the mantle.

Hence, DUPAL.

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