More Like this

1. A revised map of volcanic units in the Oman ophiolite: insights into the architecture of an oceanic proto-arc volcanic sequence

   https://doi.org/10.5194/se-10-1181-2019  

   Belgrano, Thomas M. ; Diamond, Larryn W. ; Vogt, Yves ; Biedermann, Andrea R. ; Gilgen, Samuel A. ; Al-Tobi, Khalid ( January 2019 , Solid Earth)

   Abstract. Numerous studies have revealed genetic similarities between Tethyanophiolites and oceanic “proto-arc” sequences formed above nascent subductionzones. The Semail ophiolite (Oman–U.A.E.) in particular can be viewed as ananalogue for this proto-arc crust. Though proto-arc magmatism and themechanisms of subduction initiation are of great interest, insight isdifficult to gain from drilling and limited surface outcrops in marinesettings. In contrast, the 3–5 km thick upper-crustal succession of theSemail ophiolite, which is exposed in an oblique cross section, presents anopportunity to assess the architecture and volumes of different volcanicrocks that form during the proto-arc stage. To determine the distribution ofthe volcanic rocks and to aid exploration for the volcanogenic massivesulfide (VMS) deposits that they host, we have remapped the volcanic unitsof the Semail ophiolite by integrating new field observations, geochemicalanalyses, and geophysical interpretations with pre-existing geological maps.By linking the major-element compositions of the volcanic units to rockmagnetic properties, we were able to use aeromagnetic data to infer theextension of each outcropping unit below sedimentary cover, resulting ina new map showing 2100 km2 of upper-crustal bedrock. Whereas earlier maps distinguished two main volcanostratigraphic units, wehave distinguished four, recording the progression from early spreading-axisbasalts (Geotimes), through axial to off-axial depleted basalts (Lasail), topost-axial tholeiites (Tholeiitic Alley), andmore »finally boninites (BoniniticAlley). Geotimes (“Phase 1”) axial dykes and lavas make up ∼55 vol % of the Semail upper crust, whereas post-axial (“Phase 2”) lavasconstitute the remaining ∼45 vol % and ubiquitously coverthe underlying axial crust. Highly depleted boninitic members of the Lasailunit locally occur within and directly atop the axial sequence, marking anearlier onset of boninitic magmatism than previously known for theophiolite. The vast majority of the Semail boninites, however, belong to theBoninitic Alley unit and occur as discontinuous accumulations up to 2 kmthick at the top of the ophiolite sequence and constitute ∼15 vol % of the upper crust. The new map provides a basis for targetedexploration of the gold-bearing VMS deposits hosted by these boninites. Thethickest boninite accumulations occur in the Fizh block, where magma ascentoccurred along crustal-scale faults that are connected to shear zones in theunderlying mantle rocks, which in turn are associated with economicchromitite deposits. Locating major boninite feeder zones may thus be anindirect means to explore for chromitites in the underlying mantle.« less
2. Skillful prediction of multidecadal variations in volcanic forcing: SKILLFUL PREDICTION OF VOLCANIC FORCING

   https://doi.org/10.1002/2016GL072234  

   Tuel, A. ; Naveau, P. ; Ammann, C. M. ( March 2017 , Geophysical Research Letters)
3. Late Quaternary Eruption Record and Probability of Future Volcanic Eruptions in the Long Valley Volcanic Region (CA, USA)

   https://doi.org/10.1029/2018JB015644  

   Bevilacqua, Andrea ; Bursik, Marcus ; Patra, Abani ; Bruce Pitman, E. ; Yang, Qingyuan ; Sangani, Radhika ; Kobs-Nawotniak, Shannon ( July 2018 , Journal of Geophysical Research: Solid Earth)
4. Deformation in the Northern Volcanic Zone of Iceland 2008-2014: An interplay of tectonic, magmatic, and glacial isostatic deformation: THE NORTHERN VOLCANIC ZONE OF ICELAND

   https://doi.org/10.1002/2016JB013206  

   Drouin, Vincent ; Sigmundsson, Freysteinn ; Ófeigsson, Benedikt G. ; Hreinsdóttir, Sigrún ; Sturkell, Erik ; Einarsson, Páll ( April 2017 , Journal of Geophysical Research: Solid Earth)
5. A decade of volcanic construction and destruction at the summit of NW Rota-1 seamount: 2004-2014: VOLCANIC EVOLUTION OF NW ROTA-1 SUMMIT

   https://doi.org/10.1002/2016JB013742  

   Schnur, Susan R. ; Chadwick, Jr., William W. ; Embley, Robert W. ; Ferrini, Vicki L. ; de Ronde, Cornel E. ; Cashman, Katharine V. ; Deardorff, Nicholas D. ; Merle, Susan G. ; Dziak, Robert P. ; Haxel, Joe H. ; et al ( January 2017 , Journal of Geophysical Research: Solid Earth)