Fig. 2: 3He/4He isotopic ratios versus 4He concentration (10−9 cm3 STP/g) of mantle xenoliths from Central-North Patagonia. | Nature Communications

Fig. 2: 3He/4He isotopic ratios versus 4He concentration (10−9 cm3 STP/g) of mantle xenoliths from Central-North Patagonia.

From: Pristine helium from the Karoo mantle plume within the shallow asthenosphere beneath Patagonia

Fig. 2

These measurements were determined by crushing extraction method and represent trapped components. Uncertainties are 1σ. In most cases, the uncertainty is smaller than the symbol size. Typical mid-ocean ridge basalt composition (MORB = 8 ± 1 RA25,26) is represented by yellow while typical subcontinental lithospheric mantle composition (SCLM = 6 ± 1 RA17,23) is represented by light blue. For comparison, Patagonian mantle xenoliths representing intrinsic SCLM (Pali-Aike Volcanic field17) and MORB-like (Gobernador Gregores17), as well as the Chile Ridge basalts36 were plotted. Mineral separates of mantle xenoliths (olivine, pyroxenes, and amphibole) from Antarctic (Ferrar large igneous province) also were plotted38,39. In addition, basaltic lavas from South Atlantic hotspots (Shona, Bouvet, and Discovery), which represent the Karoo mantle plume43,44,45,46, and olivine separates of lavas from Paraná-Etendeka large igneous province were plotted48.

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