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Seismological constraints on the crustal structures generated by continental rejuvenation in northeastern China.

Zheng TY, He YM, Yang JH, Zhao L - Sci Rep (2015)

Bottom Line: Here, we present a seismic image across the North China Craton (NCC) and Central Asian Orogenic Belt (CAOB) using a velocity structure imaging technique for receiver functions from a dense array.The crustal evolution of the eastern NCC was delineated during the Mesozoic by a dominant low seismic wave velocity with velocity inversion, a relatively shallow Moho discontinuity, and a Moho offset beneath the Tanlu Fault Zone.The fossil structural fabric of the convergent boundary in the eastern CAOB indicates that the back-arc action of the Paleo-Pacific Plate subduction did not reach the hinterland of Asia.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China.

ABSTRACT
Crustal rejuvenation is a key process that has shaped the characteristics of current continental structures and components in tectonic active continental regions. Geological and geochemical observations have provided insights into crustal rejuvenation, although the crustal structural fabrics have not been well constrained. Here, we present a seismic image across the North China Craton (NCC) and Central Asian Orogenic Belt (CAOB) using a velocity structure imaging technique for receiver functions from a dense array. The crustal evolution of the eastern NCC was delineated during the Mesozoic by a dominant low seismic wave velocity with velocity inversion, a relatively shallow Moho discontinuity, and a Moho offset beneath the Tanlu Fault Zone. The imaged structures and geochemical evidence, including changes in the components and ages of continental crusts and significant continental crustal growth during the Mesozoic, provide insight into the rejuvenation processes of the evolving crust in the eastern NCC caused by structural, magmatic and metamorphic processes in an extensional setting. The fossil structural fabric of the convergent boundary in the eastern CAOB indicates that the back-arc action of the Paleo-Pacific Plate subduction did not reach the hinterland of Asia.

No MeSH data available.


Related in: MedlinePlus

Simplified tectonic map of the study region showing the location of the NCISP-6 seismic array.The magenta triangles represent the seismic stations. CAOB—Central Asian Orogenic Belt, NCC—North China Craton, GDL—Gudaoling metamorphic core complexes (MCC), KLQ—Kalaqin magmatic dome, XY—Xiuyan magmatic dome, and YWLS—Yiwulushan MCC. The map was created using the generic mapping tool (GMT) software included with the ETOPO2 model42.
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f1: Simplified tectonic map of the study region showing the location of the NCISP-6 seismic array.The magenta triangles represent the seismic stations. CAOB—Central Asian Orogenic Belt, NCC—North China Craton, GDL—Gudaoling metamorphic core complexes (MCC), KLQ—Kalaqin magmatic dome, XY—Xiuyan magmatic dome, and YWLS—Yiwulushan MCC. The map was created using the generic mapping tool (GMT) software included with the ETOPO2 model42.

Mentions: Northeast China is contains the northeastern portion of the NCC and the eastern portion of the CAOB, and the Soloker suture acts as a convergent boundary (Fig. 1). The CAOB is a giant accretionary orogen between the Siberian Craton and the NCC and Tarim Craton. This orogen was formed by the subduction of the Paleo-Asian Ocean plate, the amalgamation of different types of terranes and the accretion of juvenile materials during the Late Permian to Early Triassic12. The eastern CAOB experienced intensive extensional deformation and magmatism in the Late Jurassic and Early Cretaceous13. Widespread granitic rocks are exposed and constitute the eastern part of a huge granitic belt in the CAOB14. Late Mesozoic volcanism was widespread throughout northeastern China and primarily clustered in the Great Xing’an Range15. The seismic profile crossed the extensional Songliao and Erlian Basins. The development of the Songliao Basin was characterized by early-stage rifting in the Early Cretaceous and late-stage sagging, and significant thermal subsidence persisted until the end of the Late Cretaceous13. The Erlian Basin is floored by volcanoes that primarily formed in the Upper Jurassic but may have continued into Lower Cretaceous strata, which is indicative of an active rifting regime in the basin13.


Seismological constraints on the crustal structures generated by continental rejuvenation in northeastern China.

Zheng TY, He YM, Yang JH, Zhao L - Sci Rep (2015)

Simplified tectonic map of the study region showing the location of the NCISP-6 seismic array.The magenta triangles represent the seismic stations. CAOB—Central Asian Orogenic Belt, NCC—North China Craton, GDL—Gudaoling metamorphic core complexes (MCC), KLQ—Kalaqin magmatic dome, XY—Xiuyan magmatic dome, and YWLS—Yiwulushan MCC. The map was created using the generic mapping tool (GMT) software included with the ETOPO2 model42.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4595743&req=5

f1: Simplified tectonic map of the study region showing the location of the NCISP-6 seismic array.The magenta triangles represent the seismic stations. CAOB—Central Asian Orogenic Belt, NCC—North China Craton, GDL—Gudaoling metamorphic core complexes (MCC), KLQ—Kalaqin magmatic dome, XY—Xiuyan magmatic dome, and YWLS—Yiwulushan MCC. The map was created using the generic mapping tool (GMT) software included with the ETOPO2 model42.
Mentions: Northeast China is contains the northeastern portion of the NCC and the eastern portion of the CAOB, and the Soloker suture acts as a convergent boundary (Fig. 1). The CAOB is a giant accretionary orogen between the Siberian Craton and the NCC and Tarim Craton. This orogen was formed by the subduction of the Paleo-Asian Ocean plate, the amalgamation of different types of terranes and the accretion of juvenile materials during the Late Permian to Early Triassic12. The eastern CAOB experienced intensive extensional deformation and magmatism in the Late Jurassic and Early Cretaceous13. Widespread granitic rocks are exposed and constitute the eastern part of a huge granitic belt in the CAOB14. Late Mesozoic volcanism was widespread throughout northeastern China and primarily clustered in the Great Xing’an Range15. The seismic profile crossed the extensional Songliao and Erlian Basins. The development of the Songliao Basin was characterized by early-stage rifting in the Early Cretaceous and late-stage sagging, and significant thermal subsidence persisted until the end of the Late Cretaceous13. The Erlian Basin is floored by volcanoes that primarily formed in the Upper Jurassic but may have continued into Lower Cretaceous strata, which is indicative of an active rifting regime in the basin13.

Bottom Line: Here, we present a seismic image across the North China Craton (NCC) and Central Asian Orogenic Belt (CAOB) using a velocity structure imaging technique for receiver functions from a dense array.The crustal evolution of the eastern NCC was delineated during the Mesozoic by a dominant low seismic wave velocity with velocity inversion, a relatively shallow Moho discontinuity, and a Moho offset beneath the Tanlu Fault Zone.The fossil structural fabric of the convergent boundary in the eastern CAOB indicates that the back-arc action of the Paleo-Pacific Plate subduction did not reach the hinterland of Asia.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China.

ABSTRACT
Crustal rejuvenation is a key process that has shaped the characteristics of current continental structures and components in tectonic active continental regions. Geological and geochemical observations have provided insights into crustal rejuvenation, although the crustal structural fabrics have not been well constrained. Here, we present a seismic image across the North China Craton (NCC) and Central Asian Orogenic Belt (CAOB) using a velocity structure imaging technique for receiver functions from a dense array. The crustal evolution of the eastern NCC was delineated during the Mesozoic by a dominant low seismic wave velocity with velocity inversion, a relatively shallow Moho discontinuity, and a Moho offset beneath the Tanlu Fault Zone. The imaged structures and geochemical evidence, including changes in the components and ages of continental crusts and significant continental crustal growth during the Mesozoic, provide insight into the rejuvenation processes of the evolving crust in the eastern NCC caused by structural, magmatic and metamorphic processes in an extensional setting. The fossil structural fabric of the convergent boundary in the eastern CAOB indicates that the back-arc action of the Paleo-Pacific Plate subduction did not reach the hinterland of Asia.

No MeSH data available.


Related in: MedlinePlus