Crustal evolution of the Middle Urals based on seismic reflection and refraction data

Juhlin, Christopher; Knapp, J. H.; Kashubin, Sergey; Bliznetsov, M

doi:10.1016/s0040-1951(96)00115-1

Cited by 32 publications

(25 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, it is crustal subduction in the continent-continent suture instead of whole mantle lithosphere subduction in the oceanic subduction zones. Actually, similar dipping interfaces are found in the crust of many continental collision zones (Pliffner et al, 1988;Choukrome and ECORS Team, 1989;Sorkhabi and Stump, 1993;Juhlin et al, 1996;Yang, 2000). Although fluids or shear zones are also possible explanations, crustal subduction seems the most reasonable cause for the dipping structure in the collision areas.…”

Section: Multiple Crustal Subductionssupporting

confidence: 53%

India-Eurasian collision vs. ocean-continent collision

Zeng

Ding

et al. 2007

Acta Seimol. Sin.

View full text Add to dashboard Cite

Ample observational evidence shows that there is a northward crustal subduction zone underneath the Yarlung Zangbo suture between India and Eurasia. It penetrates Moho to a depth of about 100 km. There are probably multiple such crustal subductions under the Himalayas. They are different from lithosphere subduction during oceanic collisions. The detected slabs in the upper mantle north of the Yarlung Zangbo suture can be interpreted as remains of the Indian Plate's mantle lithosphere. In contrary to ocean-continent subduction, the mantle lithosphere is delaminated from the crust as the Indian Plate subducts underneath Eurasia. Existing structural images of the crust and upper mantle of the Tibetan Plateau reveal that there were both northward and southward subductions over different geological periods, causing some seismic velocity anomalies around those subduction zones.

show abstract

Section: Multiple Crustal Subductionssupporting

confidence: 53%

India-Eurasian collision vs. ocean-continent collision

Zeng

Ding

et al. 2007

Acta Seimol. Sin.

View full text Add to dashboard Cite

show abstract

“…Earlier geophysical investigations of the Southern Uralides indicated that a pronounced crustal root (10-15 km thick) underlies the orogen [Druzhinin et aI., 1988[Druzhinin et aI., , 1990Thouvenot et aI., 1995;Berzin et aI., 1996;Carbonell et at, 1996;Echtler et aI., 1996;Juhlin et al, 1996;Knapp et al, 1996]. The presence of a Uralian crustal root has long been a subject of controversy since the crust appears to be much thicker than required for the compensation of the subdued topography [Kruise and McNutt, 1988;Doring and GOtze, 1999].…”

mentioning

confidence: 99%

Role of a phase: Change Moho in stabilization and preservation of the Southern Uralide orogen, Russia

Diaconescu

Knapp

2002

Mountain Building in the Uralides: Pangea to the Present

View full text Add to dashboard Cite

“…Near the crust-mantle boundary, the lower crust is composed of granulite, gabbro, pyroxenite and amphibole-rich rocks (Egorova et al 2006;Harley 1989;Roach 2004;Rudnick and Gao 2003), and the upper mantle consists of harzburgite, wehrlite, dunite, and lherzolite (Egorova et al 2006;Roach 2004;Sano and Kimura 2007). The transition from the lower crust to the upper mantle is usually recognized as a thin crust-mantle transition zone (CMTZ) (Durrheim and Green 1992;Finlayson et al 1993;Juhlin et al 1996;Meissner 1973), with a varied thickness (Durrheim and Green 1992;Nedimovic et al 2005;Niu and James 2002). Geophysically, the CMTZ is characterized by a jump of P-wave velocity (V p ) from *7.0 to *8.0 km/s and density from *3.0 to 3.3 g/ cm 3 (Durrheim and Green 1992;Griffin et al 1984;Meissner 1973).…”

Section: Introductionmentioning

confidence: 99%

Cumulate hornblendite enclaves in diorite–porphyrite intrusions from the Shuangyashan, Northeast China, and implications for the transition from lower crust to upper mantle in subduction setting

Zhang

Han

Wei

et al. 2009

Int J Earth Sci (Geol Rundsch)

View full text Add to dashboard Cite

A suite of hornblendite (amphibole proportion C90%) enclaves were found in Late Cretaceous dioriteporphyrite stocks intruding the lower Cretaceous coal strata around the Shuangyashan City, eastern Heilongjiang Province, Northeast China. The enclaves have similar mineralogy and may be divided into clinopyroxene-bearing and clinopyroxene-free hornblendites and both of them show cumulate textures: pargasitic amphibole and clinopyroxene are cumulus and anorthitic plagioclase is intercumulus. The accumulation might have occurred in the magma chamber, minor clinopyroxene enclosed in amphibole was earlier crystallized, followed by a large amount of amphibole, and the residual melt trapped between cumulate crystals finally formed the intercumulus plagioclase. Probably, such a crystallization process could produce layered cumulates: lower part is dominated by clinopyroxene-bearing hornblendite and upper part is composed of clinopyroxene-free one. The enclaves have similar geochemistry and imply a hydrous basaltic parental magma enriched Rb, Ba, Th and other large-ion lithophile elements. The generation of the parental magma might be related to the subduction of Paleo-Pacific plate beneath eastern Eurasian continent at that time. Estimated crystallization pressure, P-wave velocity, and density for the cumulate hornblendite enclaves are generally in agreement with the values of the local crust-mantle transition zone, suggesting that these cumulates may have the origin in the transition from the lower crust to upper mantle in arc and back-arc settings.

show abstract

Crustal evolution of the Middle Urals based on seismic reflection and refraction data

Cited by 32 publications

References 12 publications

India-Eurasian collision vs. ocean-continent collision

India-Eurasian collision vs. ocean-continent collision

Role of a phase: Change Moho in stabilization and preservation of the Southern Uralide orogen, Russia

Cumulate hornblendite enclaves in diorite–porphyrite intrusions from the Shuangyashan, Northeast China, and implications for the transition from lower crust to upper mantle in subduction setting

Contact Info

Product

Resources

About