Contrasting evolution of hydrothermal fluids in the PACMANUS system, Manus Basin: The Sr and S isotope evidence

Geology ◽  
2003 ◽  
Vol 31 (9) ◽  
pp. 805 ◽  
Author(s):  
S. Roberts ◽  
W. Bach ◽  
R.A. Binns ◽  
D.A. Vanko ◽  
C.J. Yeats ◽  
...  
Keyword(s):  
Hydrothermal Fluids ◽  
Isotope Evidence ◽  
Manus Basin ◽  
S Isotope

Coupled Fe and S isotope evidence for Archean microbial Fe(III) and sulfate reduction

Geology ◽  
2006 ◽  
Vol 34 (3) ◽  
pp. 153 ◽  
Author(s):  
Corey Archer ◽  
Derek Vance
Keyword(s):  
Sulfate Reduction ◽  
Isotope Evidence ◽  
S Isotope

Oxygen isotope evidence for major fluid flow along the contact zone of the Rum ultrabasic intrusion

1992 ◽  
Vol 129 (2) ◽  
pp. 243-246 ◽  
Author(s):  
R. C. Greenwood ◽  
A. E. Fallick ◽  
C. H. Donaldson
Keyword(s):  
Fluid Flow ◽  
Oxygen Isotope ◽  
Contact Zone ◽  
Hydrothermal Alteration ◽  
Low Temperatures ◽  
Hydrothermal Fluids ◽  
Major Pathway ◽  
Main Ring ◽  
Isotope Evidence

AbstractRecent studies indicate that the Rum Tertiary ultrabasic intrusion formed in situ, and was not emplaced as a fault-bounded plug. The suggestion that the Main Ring Fault was the primary pathway for the flow of meteoric-hydrothermal fluids on Rum is therefore seriously flawed. Oxygen isotope evidence is presented indicating that the contact zone of the intrusion was the major pathway for meteoric fluids during cooling of the pluton. δ18O depletions of over 12‰ correlate with hydrothermal alteration assemblages, indicating that the bulk of the interaction with meteoric fluids took place at low temperatures (200–450 °C).

scholarly journals Sulfur isotope evidence of geochemical zonation of the Samoan mantle plume

2021 ◽  
Author(s):  
James Dottin ◽  
Jabrane Labidi ◽  
Matthew Jackson ◽  
James Farquhar
Keyword(s):  
Mantle Plume ◽  
Sulfur Isotope ◽  
Full Range ◽  
Primitive Mantle ◽  
Isotope Evidence ◽  
The Individual ◽  
Different Origins ◽  
Prior Hypothesis ◽  
Sulfur Isotope Data ◽  
S Isotope

<p>The radiogenic Pb isotope compositions of basalts from the Samoan hotspot suggest various mantle endmembers contribute compositionally distinct material to lavas erupted at different islands [1]. Basalts from the Samoan islands sample contributions from all of the classical mantle endmembers, including extreme EM II and high <sup>3</sup>He/<sup>4</sup>He components, as well as dilute contributions from the HIMU, EM I, and DM components. Here, we present multiple sulfur isotope data on sulfide extracted from subaerial and submarine whole rocks associated with several Samoan volcanoes—Malumalu, Malutut, Upolu, Savaii, and Tutuila—that sample the full range of geochemical heterogeneity at Samoa and allow for an assessment of the S-isotope compositions associated with the different mantle components sampled by the Samoan hotspot. We observe variable S concentrations (10-1000 ppm) and δ<sup>34</sup>S values (-0.29‰ to +4.84‰ ± 0.3, 2σ). The variable S concentrations likely reflect weathering, sulfide segregation and degassing processes. The range in δ<sup>34</sup>S reflects mixing between the primitive mantle and recycled components, and isotope fractionations associated with degassing. The majority of samples reveal Δ<sup>33</sup>S within uncertainty of Δ<sup>33</sup>S=0 ‰ ± 0.008, suggesting Δ<sup>33</sup>S is relatively well mixed within the Samoan mantle plume. Important exceptions to this observation include: (1) a negative Δ<sup>33</sup>S (-0.018‰ ±0.008, 2σ) from a rejuvenated basalt on Upolu island (associated with a diluted EM I component) and (2) a previously documented small (but resolvable) Δ<sup>33</sup>S values (up to +0.027±0.016) associated with the Vai Trend (associated with a diluted HIMU component) [2]. The variability we observed in Δ<sup>33</sup>S is interpreted to reflect contributions of sulfur of different origins and likely multiple crustal protoliths. Δ<sup>36</sup>S vs. Δ<sup>33</sup>S relationships suggest all recycled S is of post-Archean origin. The heterogeneous S isotope values and distinct isotopic compositions associated with the various compositional trends confirms a prior hypothesis; unique crustal materials are heterogeneously delivered to the Samoan mantle plume and compositionally influence the individual groups of islands.</p><p>[1] Jackson et al. (2014), <em>Nature; </em>[2] Dottin et al. (2020), <em>EPSL</em></p>

scholarly journals Channelling of hydrothermal fluids during the accretion and evolution of the upper oceanic crust: Sr isotope evidence from ODP Hole 1256D

2015 ◽  
Vol 416 ◽  
pp. 56-66 ◽  
Author(s):  
Michelle Harris ◽  
Rosalind M. Coggon ◽  
Christopher E. Smith-Duque ◽  
Matthew J. Cooper ◽  
James A. Milton ◽  
...  
Keyword(s):  
Oceanic Crust ◽  
Hydrothermal Fluids ◽  
Sr Isotope ◽  
Isotope Evidence

Re-Os and S isotope evidence for the origin of Platreef mineralization (Bushveld Complex)

2017 ◽  
Vol 214 ◽  
pp. 282-307 ◽  
Author(s):  
M. Yudovskaya ◽  
E. Belousova ◽  
J. Kinnaird ◽  
E. Dubinina ◽  
D.F. Grobler ◽  
...  
Keyword(s):  
Bushveld Complex ◽  
Isotope Evidence ◽  
S Isotope
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