Mantle transition zone thickness beneath Ross Island, the Transantarctic Mountains, and East Antarctica

2008 ◽  
Vol 35 (12) ◽  
pp. n/a-n/a ◽  
Author(s):  
Angela Marie Reusch ◽  
Andrew A. Nyblade ◽  
Margaret H. Benoit ◽  
Douglas A. Wiens ◽  
Sridhar Anandakrishnan ◽  
...  
Keyword(s):  
Transition Zone ◽  
East Antarctica ◽  
Mantle Transition Zone ◽  
Transantarctic Mountains

scholarly journals Supplemental Material: Prominent thermal anomalies in the mantle transition zone beneath the Transantarctic Mountains

2020 ◽  
Author(s):  
E.L. Emry
Keyword(s):  
Transition Zone ◽  
Mantle Transition Zone ◽  
Thermal Anomalies ◽  
Additional Information ◽  
Transantarctic Mountains

Additional information about methods and results (Appendices S1 and S2, Figures S1–S8, and Datasets S1 and S2)<br>

scholarly journals Supplemental Material: Prominent thermal anomalies in the mantle transition zone beneath the Transantarctic Mountains

2020 ◽  
Author(s):  
E.L. Emry
Keyword(s):  
Transition Zone ◽  
Mantle Transition Zone ◽  
Thermal Anomalies ◽  
Additional Information ◽  
Transantarctic Mountains

Additional information about methods and results (Appendices S1 and S2, Figures S1–S8, and Datasets S1 and S2)<br>

scholarly journals Supplemental Material: Prominent thermal anomalies in the mantle transition zone beneath the Transantarctic Mountains

2020 ◽  
Author(s):  
E.L. Emry
Keyword(s):  
Transition Zone ◽  
Mantle Transition Zone ◽  
Thermal Anomalies ◽  
Additional Information ◽  
Transantarctic Mountains

Additional information about methods and results (Appendices S1 and S2, Figures S1–S8, and Datasets S1 and S2)<br>

Prominent thermal anomalies in the mantle transition zone beneath the Transantarctic Mountains

Geology ◽  
2020 ◽  
Vol 48 (7) ◽  
pp. 748-752
Author(s):  
Erica L. Emry ◽  
Andrew A. Nyblade ◽  
Alan Horton ◽  
Samantha E. Hansen ◽  
Jordi Julià ◽  
...  
Keyword(s):  
Transition Zone ◽  
Upper Mantle ◽  
Lower Mantle ◽  
Low Velocity ◽  
Mantle Transition Zone ◽  
Thermal Anomalies ◽  
Victoria Land ◽  
Convective Thermal ◽  
Mantle Processes ◽  
Transantarctic Mountains

Abstract The Transantarctic Mountains (TAMs), Antarctica, exhibit anomalous uplift and volcanism and have been associated with regions of thermally perturbed upper mantle that may or may not be connected to lower mantle processes. To determine if the anomalous upper mantle beneath the TAMs connects to the lower mantle, we interrogate the mantle transition zone (MTZ) structure under the TAMs and adjacent parts of East Antarctica using 12,500+ detections of P-to-S conversions from the 410 and 660 km discontinuities. Our results show distinct zones of thinner-than-global-average MTZ (∼205–225 km, ∼10%–18% thinner) beneath the central TAMs and southern Victoria Land, revealing throughgoing convective thermal anomalies (i.e., mantle plumes) that connect prominent upper and lower mantle low-velocity regions. This suggests that the thermally perturbed upper mantle beneath the TAMs and Ross Island may have a lower mantle origin, which could influence patterns of volcanism and TAMs uplift.

Theoretical modeling of the regular olivine intergrowths in the mimetic paramorphosis after ringwoodite and wadsleyite

2018 ◽  
pp. 3-12
Author(s):  
B. B. Shkursky
Keyword(s):  
Transition Zone ◽  
Theoretical Modeling ◽  
Mantle Transition Zone ◽  
Misorientation Angles

Theoretical modeling of regular olivine grains misorientations in mimetic paramorphoses after ringwoodite and wadsleyite, the formation of which during the ascension of matter from the Mantle Transition Zone is expected, has been carried out. The coordinates of the misorientation axes and the misorientation angles, characterizing 10 operations of alignment in the pair intergrowths of olivine grains, eight of which are twins, are calculated. Possible conditions for the formation of mimetic paramorphoses predicted here, and the chances of their persistence are discussed. The calculated orientations are compared with the known twinning laws of olivine.

scholarly journals A thin mantle transition zone beneath the equatorial Mid-Atlantic Ridge

Nature ◽  
2021 ◽  
Vol 589 (7843) ◽  
pp. 562-566
Author(s):  
Matthew R. Agius ◽  
Catherine A. Rychert ◽  
Nicholas Harmon ◽  
Saikiran Tharimena ◽  
J.-Michael Kendall
Keyword(s):  
Transition Zone ◽  
Mantle Transition Zone ◽  
Mid Atlantic Ridge
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