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

Edel, Jean–Bernard; Schulmann, Karel; Hanžl, Pavel; Lexa, Ondrej

doi:10.1016/j.jseaes.2014.07.039

Cited by 55 publications

(56 citation statements)

References 59 publications

(98 reference statements)

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“…The regional distribution of this event is uncertain, but appears to extend from the Tien Shan in the west through the Beishan, southern Gobi Altai and Inner Mongolian regions of China [18,72,73]. Paleomagnetic, structural, and seismic tomographic evidence suggest that during the Permian-Jurassic the north-south CAOB terrane collage was oroclinally bent during progressive subduction of the Mongol-Okhotsk seaway so that the Gobi Altai-Beishan region became east-west oriented [12,27]. The tectonic explanation for the older north-south trending folds identified in this study is unclear because they predate the 90 • CCW rotation of the southern arm of the CAOB orocline and thus they would have originally formed in an east-west direction along a former north-south convergent boundary.…”

Section: Discussionmentioning

confidence: 99%

“…Collision-related crustal shortening likely persisted into the Triassic [5,8,18]. It is proposed that CAOB terrane amalgamation in southern Mongolia throughout the Paleozoic occurred along a north-south oriented active margin and that the accreted terrane assemblage was subsequently oroclinally bent in a counterclockwise sense during the Permo-Triassic into an east-west orientation and cut by sinistral strike-slip faults in the Triassic-mid Jurassic [8,9,24,26,27]. The terrane amalgamation history of southern Mongolia and the Beishan region imparted a dominant east-west structural grain throughout the region (modern coordinates) consisting of terrane boundaries (including suture belts), other faults, metamorphic foliation and sedimentary strike belt trends, and magmatic arc trends [4,8,9,28].…”

Section: Paleozoic Terrane Assembly Of the Southern Caob In The Gobi mentioning

confidence: 99%

“…of intense north-south contraction associated with west-to-east, diachronous, terminal closure of the Mongol Okhotsk Ocean [11]. Tomographic images of the relict Mongol-Okhotsk slab show that it is elongated north-south in the lower 1000 km of the mantle beneath Siberia [12], suggesting that subduction was formerly towards the west beneath a north-south trending ribbon-like continent of accreted Paleozoic terranes and Precambrian slivers in western Mongolia [8,27]. The active margin subsequently buckled due to north-south shortening and closed progressively eastwards so that the westernmost Mongol-Okhotsk suture is in the Bayankhongor zone on the southern slopes (Figure 1; [39,40]).…”

Section: Mid-jurassic Contractional Tectonismmentioning

confidence: 99%

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Folded Basinal Compartments of the Southern Mongolian Borderland: A Structural Archive of the Final Consolidation of the Central Asian Orogenic Belt

Cunningham

2017

Geosciences

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Abstract:The Central Asian Orogenic Belt (CAOB) records multiple Phanerozoic tectonic events involving consolidation of disparate terranes and cratonic blocks and subsequent reactivation of Eurasia's continental interior. The final amalgamation of the CAOB terrane collage involved diachronous closure of the Permian-Triassic Solonker suture in northernmost China and the Jurassic Mongol-Okhotsk suture in northeast Mongolia and eastern Siberia. The distribution, style, and kinematics of deformation associated with these two terminal collision events is poorly documented in southern Mongolia and northernmost China because these regions were later tectonically overprinted by widespread Cretaceous basin and range-style crustal extension and Miocene-recent sinistral transpressional mountain building. These younger events structurally compartmentalized the crust into uplifted crystalline basement blocks and intermontane basins. Consequently, widespread Cretaceous and Late Cenozoic clastic sedimentary deposits overlie older Permian-Jurassic sedimentary rocks in most basinal areas and obscure the deformation record associated with Permian-Triassic Solonker and Jurassic Mongol-Okhotsk collisional suturing. In this report, satellite image mapping of basinal compartments that expose folded Permian-Jurassic sedimentary successions that are unconformably overlapped by Cretaceous-Quaternary clastic sediments is presented for remote and poorly studied regions of southern Mongolia and two areas of the Beishan. The largest folds are tens of kilometers in strike length, east-west trending, and reveal north-south Late Jurassic shortening (present coordinates). Late Jurassic fold vergence is dominantly northerly in the southern Gobi Altai within a regional-scale fold-and-thrust belt. Local refolding of older Permian north-south trending folds is also evident in some areas. The folds identified and mapped in this study provide new evidence for the regional distribution and kinematics of Jurassic and Permian-Triassic contractional tectonism in the southern Mongolia-northern China borderland region. The newly mapped folds are also important potential targets for hydrocarbon exploration and vertebrate paleontological discoveries.

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Section: Discussionmentioning

confidence: 99%

Section: Paleozoic Terrane Assembly Of the Southern Caob In The Gobi mentioning

confidence: 99%

Section: Mid-jurassic Contractional Tectonismmentioning

confidence: 99%

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Folded Basinal Compartments of the Southern Mongolian Borderland: A Structural Archive of the Final Consolidation of the Central Asian Orogenic Belt

Cunningham

2017

Geosciences

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“…This device is mainly used in geological sciences (14)(15), but with the proper sample preparation it can be used to measure many types of samples. This magnetometer spins the sample inside of magnetically isolated compartment and two coils pick up the magnetic signals.…”

Section: Methodsmentioning

confidence: 99%

Remanent Magnetization Measurements of the Fullerene Thin Films

Đuričić

Matija

Bojović

et al. 2015

Fullerenes, Nanotubes and Carbon Nanostructures

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Magnetic properties of carbon vary according to its allotropic modifications. Although carbon atom is known as a diamagnetic, some distinctive features point out that its magnetic properties are not that simple. Fullerene C 60 , a carbon atoms molecule, is proven to have very different magnetizations than other forms of carbon compounds. Rhombohedral fullerene is shown to have ferromagnetic properties, and thus investigations of fullerene as a magnetic material are necessary. Fullerene C 60 in the form of thin film is also shown to have distinctive magnetic properties. In this paper, remanent magnetization of fullerene thin films, thicknesses of 100 and 250 nm were investigated when films are in the dark and exposed to polarized light. Research showed how light is influencing the material and its magnetization.

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“…This area is located south of the Main Mongolian Lineament (Figure 1), which represents the main tectonic boundary separating the Neoproterozoic domain in the north, affected by early Palaeozoic orogenic event, from the early Palaeozoic domain to the south (e.g. Badarch, Cunningham, & Windley, 2002;Kröner et al, 2010;Ruzhentsev & Pospelov, 1992) affected by late Devonian to late Palaeozoic deformation and metamorphism (Edel, Schulmann, Hanžl, & Lexa, 2014;Lehmann et al, 2010;Xiao et al, 2009).…”

Section: Regional Settingmentioning

confidence: 99%

Geology of the Gobi Altai and Tseel terranes in the central part of the Sagsai River Watershed, SE Mongolian Altai

et al. 2017

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A geological map is an indispensable tool for understanding the structure of the Earth's crust but high-quality geological maps are usually lacking in remote areas of mountainous Central Asia covered by vast deserts. The progress in remote sensing and geographical information system (GIS), as well as the advancement in analytical methods, have generated new challenges in producing modern geological maps in such regions. The presented 1:50,000 geological map along the Sagsai River summarizes new and more accurate geological data from the geologically interesting region at the contact of the supracrustal and deep crustal Tugrug and Tseel units forming the metamorphosed accretionary wedge on the S and SW slopes of the Mongolian Altai. These geological units are formed by the lower Palaeozoic volcano-sedimentary sequences affected by Devonian Barrovian metamorphism ranging from lower greenschist to granulite facies. This metamorphic basement was subsequently intruded by the post-orogenic late Carboniferous Sagsai Pluton. The presented map shows complex relationships between different crustal levels of the metamorphosed accretionary wedge and post-tectonic intrusion evaluated using a GIS, numerical processing of remote sensing data as well as field documentation and laboratory studies. ARTICLE HISTORY

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

Cited by 55 publications

References 59 publications

Folded Basinal Compartments of the Southern Mongolian Borderland: A Structural Archive of the Final Consolidation of the Central Asian Orogenic Belt

Folded Basinal Compartments of the Southern Mongolian Borderland: A Structural Archive of the Final Consolidation of the Central Asian Orogenic Belt

Remanent Magnetization Measurements of the Fullerene Thin Films

Geology of the Gobi Altai and Tseel terranes in the central part of the Sagsai River Watershed, SE Mongolian Altai

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