Crust and upper mantle S wave velocity structure in eastern Turkey based on ambient noise tomography

Wang, Peng1; Chen, Juqing5; Feng, Xuping5; Pan, Lei2,5; Chen, Xiaofei2,3,4,5,6

2024-04-10

10.1016/j.tecto.2024.230267

TECTONOPHYSICS   影响因子和分区

0040-1951

1879-3266

Eastern Turkey is an ideal location to study continental collision, which is manifested here by the presence of extensive volcanism and rapid tectonic uplift. To better understand the relationship between these surface phenomena and underground structures, we collect continuous waveform data from 121 seismic stations in the region to investigate the S wave velocity structure of the crust and upper mantle using ambient noise tomography. We obtain Rayleigh wave dispersion curves for periods between 5 and 100 s based on frequency-Bessel (FJ) transform dispersion analysis. We then perform quasi-Newton inversion to calculate the S wave velocity structure between 0 and 200 km. The results indicate the presence of two high-velocity anomalies: one in the southern Black Sea that may represent stable and cold lithospheric mantle and another near Lake Van that may represent the subduction remnant of the southern branch of the Neo-Tethys Ocean. In addition, the results demonstrate that the overall velocity in the study area is lower than the global average and reveal extensive upper mantle low-velocity zones (UMLVZs) which represent asthenospheric materials, and mid-crustal low-velocity zones (MCLVZs). In this study, we propose two possible formation mechanisms of the MCLVZs: one is partial melting, and the other is the formation of low-velocity compositional layering due to complex refining and differentiation processes and subsequent continent reworking. Considering that the spatial distribution of the MCLVZs and UMLVZs is well correlated with regional volcanic activity, the MCLVZs and UMLVZs may provide the driving force and are the material sources for volcanism in the area. Furthermore, the extremely thin and weak lithospheric mantle lid and the exceedingly shallow lithosphere asthenosphere boundary (LAB) indicate that the lower part of the lithosphere has delaminated and that the asthenosphere intrudes into a very shallow location, which then supports regional tectonic uplift.

Eastern Turkey Ambient noise tomography Frequency-Bessel transform method Mid-crustal low-velocity zones Upper mantle low-velocity zones

SCI ; EI

英语

通讯

National Natural Science Foundation of China["92155307","42004032"] ; Guangdong Provincial Key Laboratory of Geophysical High-resolution Imaging Technology[2022B1212010002] ; Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)[GML2019ZD0203] ; Shenzhen Key Laboratory of Deep Offshore Oil and Gas Exploration Technology[ZDSYS20190902093007855] ; Shenzhen Science and Technology Program[KQTD20170810111725321]

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:001208380200001

ELSEVIER

GEOSCIENCES

Web of Science

1.Univ Sci & Technol China, Sch Earth & Space Sci, Hefei, Peoples R China
2.Southern Univ Sci & Technol, Guangdong Prov Key Lab Geophys High resolut Imagin, Shenzhen, Peoples R China
3.Southern Univ Sci & Technol, Southern Marine Sci & Engn Guangdong Lab Guangzhou, Guangzhou, Peoples R China
4.Southern Univ Sci & Technol, Shenzhen Key Lab Deep Offshore Oil & Gas Explorat, Shenzhen, Peoples R China
5.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen, Peoples R China
6.Southern Univ Sci & Technol, Shenzhen, Peoples R China

Wang, Peng,Chen, Juqing,Feng, Xuping,et al. Crust and upper mantle S wave velocity structure in eastern Turkey based on ambient noise tomography[J]. TECTONOPHYSICS,2024,876.

Wang, Peng,Chen, Juqing,Feng, Xuping,Pan, Lei,&Chen, Xiaofei.(2024).Crust and upper mantle S wave velocity structure in eastern Turkey based on ambient noise tomography.TECTONOPHYSICS,876.

Wang, Peng,et al."Crust and upper mantle S wave velocity structure in eastern Turkey based on ambient noise tomography".TECTONOPHYSICS 876(2024).