Imaging a magma plumbing system from MASH zone to magma reservoir

Delph, Jonathan R.; Ward, Kevin M.; Zandt, G.; Ducea, Mihai N.; Beck, S. L.

doi:10.1016/j.epsl.2016.10.008

Cited by 67 publications

(76 citation statements)

References 61 publications

(123 reference statements)

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“…Shear velocity results across the ENAM can be seen in Figures and . Throughout this study we define the crustal Moho interface by the 4.2 km/s velocity contour [e.g., Delph et al , ]. The 4.2 km/s velocity contour is a good proxy for Moho depth as it represents the maximum potential shear velocity for typical crustal material [e.g., Christensen , ].…”

Section: Resultsmentioning

confidence: 99%

Crustal structure across the eastern North American margin from ambient noise tomography

Lynner

Porritt

2017

Geophysical Research Letters

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Passive tectonic margins, like the eastern North American margin (ENAM), represent the meeting of oceanic and continental material where no active deformation is occurring. The recent ENAM Community Seismic Experiment provides an opportunity to examine the crustal structure across the ENAM owing to the simultaneous deployment of offshore and onshore seismic instrumentation. Using Rayleigh wave phase and group velocities derived from ambient noise data, we invert for shear velocity across the ENAM. We observe a region of transitional crustal thicknesses that connects the oceanic and continental crusts. Associated with the transitional crust is a localized positive gravitational anomaly. Farther east, the East Coast magnetic anomaly (ECMA) is located at the intersection of the transitional and oceanic crusts. We propose that underplating of dense magmatic material along the bottom of the transitional crust is responsible for the gravitational anomaly and that the ECMA demarks the location of initial oceanic crustal formation.

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Section: Resultsmentioning

confidence: 99%

Crustal structure across the eastern North American margin from ambient noise tomography

Lynner

Porritt

2017

Geophysical Research Letters

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“…Considering therefore only the effects that interstitial melt will have on the elastic moduli of the rock/melt matrix (and neglecting the effects of temperature) can give us an upper limit on melt percentage. Comparing the observed shear velocities of ∼4.1 km/s in the upper mantle to the expected shear velocity of 4.5 km/s for a peridotite, we estimate that ≤6% melt is present in the upper mantle of Central Anatolia [ Yoshino et al ., ; Delph et al ., ].…”

Section: Interpretationsmentioning

confidence: 99%

Shallow melting of MORB‐like mantle under hot continental lithosphere, Central Anatolia

Reid

Schleiffarth

Cosca

et al. 2017

Geochem Geophys Geosyst

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Widespread mafic volcanism, elevated crustal temperatures, and plateau‐type topography in Central Anatolia, Turkey, could collectively be the result of lithospheric delamination, mantle upwelling, and tectonic escape. We use results from 40Ar/39Ar geochronology, basalt geochemistry, and a passive‐source broadband seismic experiment obtained in a collaborative international effort (Continental Dynamics‐Central Anatolia Tectonics) to investigate the upper mantle structure and evolution of melting conditions over an ∼2400 km2 area south and west of Hasan volcano. New 40Ar/39Ar dates for the basalts mostly cluster between 0.2 and 0.6 Ma, but some scoria cones are as old as 2.5 Ma. Basalts are dominantly Mg‐rich (Mg# = 62–71), moderately alkaline (normative Ne < 5 wt %), and, based on major and trace element signatures, derived from a peridotitic source. Covariations between radiogenic isotope and trace element signatures reveal contributions from a subduction‐related component and intraplate‐like mantle asthenosphere, as well as from ambient upper mantle. Central Anatolian basalts reflect maximum mantle potential temperatures of <1350°C and an average pressure of melt equilibration of 1.4 GPa, which are cooler and shallower than for basalts from Eastern and Western Anatolia. When considered in light of regionally slow upper mantle shear wave velocities, the mantle lithosphere may be thin and infiltrated by melts, or largely absent. An absence of secular changes in melting conditions suggests little to no lithospheric thinning over the past ∼1 Ma, despite evidence for lithospheric extension. Hasan basalts appear to be generated by decompression melting in response to the rollback of the Cyprean slab.

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“…By combining receiver functions derived from common conversion point (CCP) stacking (Dueker and Sheehan, 1997) with ANT-derived dispersion data, a highreso lution shear-wave velocity model can be obtained for the crust and uppermost mantle (Julià et al, 2000;Delph et al, 2015b;Delph et al, 2017). In this study, we build on this approach by combining longer period dispersion data obtained through TPWT to obtain shear-wave velocity results deeper into the upper mantle.…”

Section: The Joint Inversion Of Multiple Data Setsmentioning

confidence: 99%

“…By utilizing the joint inversion of receiver functions and ANT-derived dispersion data, we can obtain a crustal model that mitigates the need to assume an a priori crustal model that may be weakly constrained. We follow the methodology described by Delph et al (2015b) and Delph et al (2017) to create CCP-derived receiver functions. First, we re-compute the highquality receiver functions obtained by Abgarmi et al (2017) using a Gaussian lowpass filter of ~1.4 Hz (Gaussian pulse with a 2.8 alpha parameter).…”

Section: The Joint Inversion Of Multiple Data Setsmentioning

confidence: 99%

“…This velocity model has a minimal effect on the resulting CCP-derived receiver functions, as the same velocity model is used to migrate the newly stacked receiver functions back to time (Delph et al, 2015b). A Gaussian filter is then used on the resulting CCP profiles to reduce the effects of spurious and unrealistic amplitude artifacts, which result from introducing new data into a CCP bin (see Delph et al, 2017, for details).…”

Section: The Joint Inversion Of Multiple Data Setsmentioning

confidence: 99%

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The effects of subduction termination on the continental lithosphere: Linking volcanism, deformation, surface uplift, and slab tearing in central Anatolia

et al. 2017

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Subduction beneath central Anatolia represents the transition between continuous subduction along the Aegean trench in the west and slab break-off and/or subduction termination at the Arabian-Eurasian collision zone in the east. Using recently collected seismic data from the Continental Dynamics-Central Anatolian Tectonics project alongside a newly developed approach to the creation of a 3D shear-velocity model from the joint inversion of receiver functions and surface-wave dispersion data, we can gain important insights into the character of the downgoing, segmenting African lithosphere and its relationship with the overriding Central Anatolian plate. These results reveal that the mantle lithosphere of central Anatolia is thin and variable (<50-80 km) due to the decoupling of the crust of accreted lithospheric blocks from their associated lithospheric mantle, which continued to subduct and was subsequently removed by slab delamination during early-mid Miocene times. The resulting lithospheric thickness variations appear to control deformation as well as the distribution of vol canism throughout the region. In the Central Anatolian Volcanic Province, the upper most mantle is characterized by very slow shear velocities (<4.2 km/s) consistent with the presence of melt in the uppermost mantle. The fastest shear velocities observed in this study (>4.5 km/s) underlie the Central Taurus Mountains, which have experienced ~2 km of uplift in the past ~8 m.y. These velocities are consistent with lithospheric mantle, and we interpret that the recent uplift of these mountains is due to a rebound of the subducting slab after slab break-off and/or fragmentation rather than asthenospheric influx.

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Imaging a magma plumbing system from MASH zone to magma reservoir

Cited by 67 publications

References 61 publications

Crustal structure across the eastern North American margin from ambient noise tomography

Crustal structure across the eastern North American margin from ambient noise tomography

Shallow melting of MORB‐like mantle under hot continental lithosphere, Central Anatolia

The effects of subduction termination on the continental lithosphere: Linking volcanism, deformation, surface uplift, and slab tearing in central Anatolia

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