Nd and Sr isotope evidence linking mid-ocean-ridge basalts and abyssal peridotites

Nature ◽  
1994 ◽  
Vol 371 (6492) ◽  
pp. 57-60 ◽  
Author(s):  
Jonathan E. Snow ◽  
Stanley R. Hart ◽  
Henry J. B. Dick
Keyword(s):  
Sr Isotope ◽  
Mid Ocean Ridge ◽  
Isotope Evidence ◽  
Ocean Ridge

Celestine discovered in Hawaiian basalts

2020 ◽  
Vol 105 (1) ◽  
pp. 52-57
Author(s):  
Michael O. Garcia ◽  
Eric Hellebrand
Keyword(s):  
Oceanic Islands ◽  
Sr Isotope ◽  
Fine Grained ◽  
Host Basalt ◽  
Mid Ocean Ridge ◽  
The Matrix ◽  
First Occurrence ◽  
Oceanic Basalts ◽  
Ocean Ridge ◽  
Isotope Analyses

Abstract We report here the first occurrence of celestine (SrSO4) in recent oceanic basalts. Celestine was found in moderately altered accidental volcanic blocks from Ka‘ula Island, a rejuvenated tuff cone in the northern Hawaiian Islands. This occurrence is novel not only for the presence of celestine but also for the absence of barite, the sulfate mineral most commonly found in oceanic hydrothermal deposits. Celestine was found lining vesicles and partially fillings voids within the matrix of several high Sr (2200–6400 ppm) Ka‘ula basalts. High-quality wavelength-dispersive microprobe analyses of celestine are reported here for near end-member celestine (>90%). The Ka‘ula celestine deposits are compositionally heterogeneous with large variations in Ba content (0.9–7.5 wt%) within single mineral aggregates. The most likely source of the Sr for celestine in the Ka‘ula basalts was the host basalt, which contains ~1200 ppm. This is about 10 times higher than normally found in mid-ocean ridge basalts and 4 times greater than commonly observed in Hawaiian basalts. Hydrothermal alteration by S-bearing fluids related to the eruption that transported these accidentally fragments probably mobilized Sr in the blocks. These S-rich solutions later precipitated celestine during or following the eruption. We were unable to confirm the origin for the Sr via Sr isotope measures because the Ka‘ula celestine was too fine grained, friable, and widely dispersed to be concentrated for Sr isotope analyses. Future studies of basalts from active volcanoes on oceanic islands, especially for basalts with elevated Sr contents (>1000 ppm), should be aware of the possible presence of celestine in moderately altered lavas.

Lithium isotope evidence for subduction-enriched mantle in the source of mid-ocean-ridge basalts

Nature ◽  
2006 ◽  
Vol 443 (7111) ◽  
pp. 565-568 ◽  
Author(s):  
Tim Elliott ◽  
Alex Thomas ◽  
Alistair Jeffcoate ◽  
Yaoling Niu
Keyword(s):  
Lithium Isotope ◽  
Enriched Mantle ◽  
Mid Ocean Ridge ◽  
Isotope Evidence ◽  
Ocean Ridge

Oxygen-isotope evidence for recycled crust in the sources of mid-ocean-ridge basalts

Nature ◽  
2000 ◽  
Vol 403 (6769) ◽  
pp. 530-534 ◽  
Author(s):  
John M. Eiler ◽  
Pierre Schiano ◽  
Nami Kitchen ◽  
Edward M. Stolper
Keyword(s):  
Oxygen Isotope ◽  
Mid Ocean Ridge ◽  
Isotope Evidence ◽  
Ocean Ridge

PETROGENESIS OF GABBRO FROM ARCTIC GAKKEL MID-OCEAN RIDGE

2019 ◽  
Author(s):  
Yung Ping Lee ◽  
◽  
Jonathan E. Snow ◽  
Yongjun Gao
Keyword(s):  
Mid Ocean Ridge ◽  
Ocean Ridge

scholarly journals Melt addition to mid-ocean ridge peridotites increases spinel Cr# with no significant effect on recorded oxygen fugacity

2021 ◽  
Vol 566 ◽  
pp. 116951
Author(s):  
Suzanne K. Birner ◽  
Elizabeth Cottrell ◽  
Jessica M. Warren ◽  
Katherine A. Kelley ◽  
Fred A. Davis
Keyword(s):  
Oxygen Fugacity ◽  
Mid Ocean Ridge ◽  
Ocean Ridge

scholarly journals Sunda arc mantle source δ18O value revealed by intracrystal isotope analysis

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Frances M. Deegan ◽  
Martin J. Whitehouse ◽  
Valentin R. Troll ◽  
Harri Geiger ◽  
Heejin Jeon ◽  
...  
Keyword(s):  
Mantle Source ◽  
Secondary Ion Mass Spectrometry ◽  
Isotope Composition ◽  
Isotope Analysis ◽  
Sunda Arc ◽  
Mid Ocean Ridge ◽  
Plumbing Systems ◽  
Ocean Ridge ◽  
Secondary Ion ◽  
Magma Plumbing

AbstractMagma plumbing systems underlying subduction zone volcanoes extend from the mantle through the overlying crust and facilitate protracted fractional crystallisation, assimilation, and mixing, which frequently obscures a clear view of mantle source compositions. In order to see through this crustal noise, we present intracrystal Secondary Ion Mass Spectrometry (SIMS) δ18O values in clinopyroxene from Merapi, Kelut, Batur, and Agung volcanoes in the Sunda arc, Indonesia, under which the thickness of the crust decreases from ca. 30 km at Merapi to ≤20 km at Agung. Here we show that mean clinopyroxene δ18O values decrease concomitantly with crustal thickness and that lavas from Agung possess mantle-like He-Sr-Nd-Pb isotope ratios and clinopyroxene mean equilibrium melt δ18O values of 5.7 ‰ (±0.2 1 SD) indistinguishable from the δ18O range for Mid Ocean Ridge Basalt (MORB). The oxygen isotope composition of the mantle underlying the East Sunda Arc is therefore largely unaffected by subduction-driven metasomatism and may thus represent a sediment-poor arc end-member.

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