The Crust in the Pamir: Insights From Receiver Functions
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F19%3A00517415" target="_blank" >RIV/67985530:_____/19:00517415 - isvavai.cz</a>
Result on the web
<a href="https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2019JB017765" target="_blank" >https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2019JB017765</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1029/2019JB017765" target="_blank" >10.1029/2019JB017765</a>
Alternative languages
Result language
angličtina
Original language name
The Crust in the Pamir: Insights From Receiver Functions
Original language description
The Cenozoic convergence between India and Asia has created Earth's thickest crust in the Pamir-Tibet Plateau by extreme crustal shortening. Here we study the crustal structure of the Pamir and western Tian Shan, the adjacent margins of the Tajik, Tarim, and Ferghana Basins, and the Hindu Kush, using data collected by temporary seismic experiments. We derive, compare, and combine independent observations from P and S receiver functions. The obtained Moho depth varies from similar to 40 km below the basins to a double-normal thickness of 65-75 km underneath the Pamir and Hindu Kush. A Moho doublet-with the deeper interface down to a depth of similar to 90 km-coincides with the arc of intermediate-depth seismicity underneath the Pamir, where Asian continental lower crust delaminates and rolls back. The crust beneath most of the Central and South Pamir has a low V-p/V-s ratio (<1.70), suggesting a dominantly felsic composition, probably a result of delamination/foundering of the mafic rocks of the lower crust. Beneath the Cenozoic gneiss domes of the Central and South Pamir, which represent extensional core complexes, the V-p/V-s ratios are moderate to high (similar to 1.75), consistent with the previously observed, midcrustal low-velocity zones, implying the presence of crustal partial melts. Even higher crustal average V-p/V-s ratios up to 1.90 are found in the sedimentary basins and along the Main Pamir Thrust. The ratios along the latter-the active thrust front of the Pamir-may reflect fluid accumulations within a strongly fractured fault system.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10507 - Volcanology
Result continuities
Project
—
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Geophysical Research: Solid Earth
ISSN
2169-9313
e-ISSN
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Volume of the periodical
124
Issue of the periodical within the volume
8
Country of publishing house
US - UNITED STATES
Number of pages
19
Pages from-to
9313-9331
UT code for WoS article
000491283500091
EID of the result in the Scopus database
2-s2.0-85070929050