Late paleozoic-Early Mesozoic within-plate magmatism in North Asia: traps, rifts, giant batholiths, and the geodynamics of their origin

Yarmolyuk, V. V.; Kuzmin, M. I.; Kozlovsky, A. M.

doi:10.1134/s0869591113010062

Cited by 75 publications

(38 citation statements)

References 30 publications

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“…[] and Yarmolyuk et al . [] as magmatic rift zones parallel to major boundaries between the Trans‐Altai Zone and the Gobi‐Altai Zone in the north and the South Gobi Zone in the south. In addition, the magnetic highs north of the Main Mongolian Lineament correspond geographically with the Permian and Triassic magmatic rift zones as defined by Yarmolyuk et al .…”

Section: Discussionmentioning

confidence: 99%

“…The South Gobi Zone is affected by subhorizontal greenschist facies shear zones and upright folding of Late Carboniferous age [ Guy et al ., ]. Both the Lake Zone and the Gobi‐Altai Zone exhibit the characteristics of an active margin in which magmatism took place during the Late Carboniferous [ Kozlovsky et al ., ; Yarmolyuk et al ., ], followed by the intrusion of alkaline plutons in the Permian, the event associated with the formation of grabens, bimodal volcanism, and partial melting of the crust [ Yarmolyuk et al ., ].…”

Section: Geological and Tectonic Settingmentioning

confidence: 99%

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Geophysical constraints for terrane boundaries in southern Mongolia

et al. 2014

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The Central Asian Orogenic Belt (CAOB) is a typical accretionary orogen divided into numerous lithostratigraphic terranes. In theory, these terranes should be characterized by contrasting magnetic and gravity signatures owing to their dissimilar petrophysical properties. To test this hypothesis, the extent of tectonostratigraphic terranes in southern Mongolia was compared with the potential field data. The analysis reveals that the terrane boundaries are not systematically defined by strong gravity and magnetic gradients. The correlation of the magnetic signal with the geology reveals that the magnetic highs coincide with Late Carboniferous to Early Permian volcanic-plutonic belts. The matched filtering shows a good continuity of signal along the boundaries of these high magnetic anomalies toward the deeper crustal levels which may indicate the presence of deeply rooted tectonomagmatic zones. The axes of high-density bodies in the western and central parts of the study area are characterized by periodic alternations of NW-SE trending gravity anomalies corresponding to up to 20 km wide cleavage fronts of Permo-Triassic age. The matched filtering analysis shows good continuity of signal to the depth of these gravity highs which may indicate presence of deeply rooted high-strain zones. The magnetic signal is interpreted to be as the result of a giant Permo-Triassic magmatic event associated with lithosphere-scale deformation, whereas the gravity pattern is related to the postaccretionary shortening of the CAOB between the North China and Siberia cratons.

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Section: Discussionmentioning

confidence: 99%

Section: Geological and Tectonic Settingmentioning

confidence: 99%

Geophysical constraints for terrane boundaries in southern Mongolia

et al. 2014

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“…Unless the overprints with normal polarity were acquired during the short normal events within the Kiaman reversal reported at 305 Ma and 280 Ma respectively (Alva-Valdivia et al, 2002), they must have taken place at the beginning or the end of the long-term stable Kiaman Reversed Superchron, which lasted from 311 Ma to 262 Ma (Eide and Torsvik, 1996). Based on the ages of granitoids forming the south Mongolian magmatic province (300-275 Ma, Yarmolyuk et al, 2013a), and the relative palaeolatitudes of Southern Mongolia and North China, most (B) magnetization may have been acquired in the Permian. According to the mean inclination of 0°, southern Mongolia was in an equatorial position at that time.…”

Section: The (B) Groupmentioning

confidence: 99%

Palaeomagnetic and structural constraints on 90° anticlockwise rotation in SW Mongolia during the Permo–Triassic: Implications for Altaid oroclinal bending. Preliminary palaeomagnetic results

Edel

Schulmann

Hanžl

et al. 2014

Journal of Asian Earth Sciences

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“…This indicates a change in lithospheric structure that took place during the Cretaceous episode of extension [ Guy et al , ] accompanied by the lithosphere delamination affecting the whole region of NE Asia [ Chen et al , ]. A pronounced gravity low in the north‐west of the map correlates with the southern margin of the Permian Hangay Dome anomaly located further north [ Petit et al , ; Yarmolyuk et al , ].…”

Section: Geophysical Characterization Of the Lower Crustmentioning

confidence: 99%

Geophysical and geochemical nature of relaminated arc‐derived lower crust underneath oceanic domain in southern Mongolia

et al. 2015

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The Central Asian Orogenic Belt (CAOB) in southern Mongolia consists of E-W trendingNeoproterozoic cratons and Silurian-Devonian oceanic tectonic zones. Previous study revealed that the Early Paleozoic accretionary wedge and the oceanic tectonic zone are underlain by a layer giving a homogeneous gravity signal. Forward gravity modelling suggests that this layer is not formed of high-density material typical of lower oceanic crust but is composed of low-to intermediate-density rocks resembling continental crust. The nature of this lower crust is constrained by the whole-rock geochemistry and zircon Hf isotopic signature of abundant Late Carboniferous high-K calc-alkaline and Early Permian A-type granitoids intruding the two Early Paleozoic domains. It is possible to explain the genesis of these granitoids by anatexis of juvenile, metaigneous (tonalitic-gabbroic) rocks of Late Cambrian age, the source of which is presumed to lie in the "Khantaishir" arc (520-495 Ma) further north. In order to test this hypothesis, the likely modal composition and density of Khantaishir arc-like protoliths are thermodynamically modelled at granulite-and higher amphibolite-facies conditions. It is shown that the current average density of the lower crust inferred by gravity modelling (2730 ± 20 kg/m 3 ) matches best metamorphosed leucotonalite to diorite. Based on these results, it is now proposed that Mongolian CAOB has an architecture in which the accretionary wedge and oceanic upper crust is underlain by allochthonous lower crust that originated in a Cambrian arc. A tectonic model explaining relamination of allochthonous felsic to intermediate lower crust beneath mafic upper crust is proposed.

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Late paleozoic-Early Mesozoic within-plate magmatism in North Asia: traps, rifts, giant batholiths, and the geodynamics of their origin

Cited by 75 publications

References 30 publications

Geophysical constraints for terrane boundaries in southern Mongolia

Geophysical constraints for terrane boundaries in southern Mongolia

Palaeomagnetic and structural constraints on 90° anticlockwise rotation in SW Mongolia during the Permo–Triassic: Implications for Altaid oroclinal bending. Preliminary palaeomagnetic results

Geophysical and geochemical nature of relaminated arc‐derived lower crust underneath oceanic domain in southern Mongolia

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