The crustal assembly of southern Mongolia: New structural, lithological and geochronological data from the Nemegt and Altan ranges

Rippington, Stephen; Cunningham, Dickson; England, Richard; Hendriks, B.W.H.

doi:10.1016/j.gr.2012.09.001

Cited by 17 publications

(4 citation statements)

References 39 publications

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“…In contrast, western Mongolia and China, including the Chinese and Gobi‐Altai, the Tien Shan, and North Tarim, Junggar and Turpan basins, are broadly interpreted to be contractile in the Jurassic‐Cretaceous (Hendrix et al ., ; Graham et al ., ; Dumitru et al ., ; Greene et al ., ; Jolivet et al ., ). Previous studies have noted the occurrence of extensional basin systems in the Mongolian and Gobi‐Altai provinces (Howard et al ., ; Cunningham et al ., ; Rippington et al ., ), but given significant Cenozoic structural overprinting and inversion, Mesozoic basin morphology is difficult to reconstruct. The Tugrug basin, now illuminated by subsurface core and seismic data, is located in the ‘transition’ zone between the regional extensional and contractile provinces, and thus could represent a hybrid response to these distinct tectonic phases and domains.…”

Section: Discussionmentioning

confidence: 97%

“…Given that late Mesozoic rift basins host most of the known hydrocarbon potential in Mongolia, a key question of both economic and tectonic importance is how far west the extensional province extends. Normal faults within Cretaceous sections, including low‐angle faults, are documented in the southern Gobi‐Altai (Altan Uul; Cunningham et al ., ; Rippington et al ., ) and in the Dzereg basin of northwest Mongolia (Howard et al ., ; Cunningham, ; Fig. ).…”

Section: Introductionmentioning

confidence: 97%

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Subsurface evidence for late Mesozoic extension in western Mongolia: tectonic and petroleum systems implications

Johnson

Constenius²,

Graham

et al. 2014

Basin Research

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New seismic reflection profiles from the Tugrug basin in the Gobi‐Altai region of western Mongolia demonstrate the existence of preserved Mesozoic extensional basins by imaging listric normal faults, extensional growth strata, and partially inverted grabens. A core hole from this region recovered ca. 1600 continuous meters of Upper Jurassic – Lower Cretaceous (Kimmeridgian–Berriasian) strata overlying Late Triassic volcanic basement. The cored succession is dominated by lacustrine and marginal lacustrine deposits ranging from stratified lacustrine, to subaqueous fan and delta, to subaerial alluvial‐fluvial environments. Multiple unconformities are encountered, and these represent distinct phases in basin evolution including syn‐extensional deposition and basin inversion. Prospective petroleum source and reservoir intervals occur, and both fluid inclusions and oil staining in the core provide evidence of hydrocarbon migration. Ties to correlative outcrop sections underscore that, in general, this basin appears to share a similar tectono‐stratigraphic evolution with petroliferous rift basins in eastern Mongolia and China. Nevertheless, some interesting contrasts to these other basins are noted, including distinct sandstone provenance, less overburden, and younger (Neogene) inversion structures. The Tugrug basin occupies an important but perplexing paleogeographic position between late Mesozoic contractile and extensional provinces. Its formation may record a rapid temporal shift from orogenic crustal thickening to extensional collapse in the Late Jurassic, and/or an accommodation zone with a Mesozoic strike‐slip component.

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Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

Subsurface evidence for late Mesozoic extension in western Mongolia: tectonic and petroleum systems implications

Johnson

Constenius²,

Graham

et al. 2014

Basin Research

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“…The basalts are characterised by an island-arc geochemical signature (Lamb and Badarch 2001). The overlying sequence of Middle to Upper Devonian flysch, associated with mafic to intermediate volcanic rocks, is probably rift-related (Ruzhentsev and Pospelov 1992;Lamb and Badarch 1997;Kröner et al 2010;Lehmann et al 2010;Rippington et al 2013). The Devonian rocks are covered by products of acid-intermediate volcanism of the Early Carboniferous age (Filippova et al 1990).…”

Section: Geology Of the Trans-altai Zonementioning

confidence: 99%

From magmatic arc to a post-accretionary setting: Late Palaeozoic granitoid plutons in the northwestern Trans-Altai Zone, Mongolia

Hanžl¹,

Janoušek²,

Hrdličková³

et al. 2023

J. Geosci.

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The Trans-Altai Zone in the southern tract of the Central Asian Oceanic Belt is composed of Early Palaeozoic oceanic crust preserved in Ordovician to Devonian ophiolite fragments and Devonian-Carboniferous igneous arcs. The Edren and Baaran subzones at the NW tip of the Trans-Altai Zone were intruded by Late Palaeozoic plutons that have been examined by the combined geochronological and geochemical study. Mississippian subduction-related plutons intruded Devonian and Carboniferous volcano-sedimentary sequences in two magmatic pulses. The older, Tournaisian plutons (dated at 352 ± 1 and 347 ± 4 Ma) occur in both subzones; the younger Visean/Serpukhovian ones (331 ± 1 Ma) are found only at the northern boundary of the Edren Subzone. All Mississippian rocks are high-K calc-alkaline and characterised by a strong enrichment of hydrous fluid mobile lithophile elements over conservative Nb, Ta and Ti relative to normal mid-ocean ridge basalts. Low 87 Sr/ 86 Sr i (~ 0.7035-0.7038) and highly positive ε i Nd values (+ 6.6 to + 5.2) suggest a relatively juvenile parental magma source with a short mean crustal residence. This corresponds well with the age of scarce inherited zircons, none of which is older than 530 Ma. The Early Permian post-tectonic plutons intruded the shallow crust of the Baaran Subzone (Devonian-Carboniferous flysch and Early Carboniferous volcanic arc). The prominent concentric body of the Aaj Bogd Pluton is composed of monzodiorites to monzogabbros (284 ± 1 and 294 ± 3 Ma) in its centre, surrounded by granite with syenite (282 ± 1 Ma) in the main mass of the pluton. Whole-rock Sr-Nd isotopic ratios match those of Carboniferous magmatic rocks, while trace-element patterns point to an intra-plate origin influenced by a fertile asthenospheric mantle component. On the other hand, the slightly older (290 ± 1 Ma) quartz syenites to alkali feldspar granites in the Baaran Subzone have spurious arc-like geochemistry inherited from their arc-related crustal source(s). Regional distribution of the numerous oval-shaped Early Permian alkaline post-orogenic plutons, some with A 2 -type granite affinity, follows the major Permian strike-slip zones spanning from the Dulate Arc in the west to the Khan Bogd Pluton in the east. These late, transcurrent zones apparently played an important role in late-orogenic magma generation, ascent and emplacement.

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“…The study of lineaments has been applied successfully to structural geology studies and their applications such as oreforming systems, mineral exploration, petroleum, nuclear energy facility sittings (19,40,41,25,18,15,24,1,38,42), water resource investigations, groundwater studies (20,21,22,6,11), hazard assessment (4) and geological and other studies (37,23,35).…”

Section: Introductionmentioning

confidence: 99%

Mapping of Lineaments and Knowledge Base Preparation using Geomatics Techniques for part of the Godavari and Tapi Basins, India: A Case Study

Prasad¹,

Jain²,

Gairola³

2013

IJCA

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Earth consists of hard rock layers where water is restricted to secondary permeability, and thus to fractures and the weather zones. Structural geology studies, geologic lineaments and their pattern information are essential for better planning and execution of projects to avoid any natural hazards. Satellite images, aerial photographs and digital elevation models will give lineament information. Recent advances in digital image processing allow such lineament extraction to be accomplished in semi-automatic to fully automatic approaches. The accuracy of extracting lineaments depends strongly on the spatial resolution of the imagery, higher resolution imagery result in a higher quality of lineament map. In this paper, an attempt has been made for Mapping of lineaments and knowledge base preparation using geomatics techniques for part of the Godavari and Tapi Basins, India. A methodology for lineament extraction and the design of a knowledge-based lineament identification system has been proposed for geological aspects of any developmental activity. This methodology might potentially be adopted for the identification of several features of geological or anthropogenic origin. The study results of lineaments and the rose diagrams of the extracted lineaments can be applied to structural geology studies and their applications such as oreforming systems, mineral exploration, petroleum, nuclear energy facility sittings and water resource investigations, groundwater studies and also for finding suitable sites for dams and reservoirs.

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The crustal assembly of southern Mongolia: New structural, lithological and geochronological data from the Nemegt and Altan ranges

Cited by 17 publications

References 39 publications

Subsurface evidence for late Mesozoic extension in western Mongolia: tectonic and petroleum systems implications

Subsurface evidence for late Mesozoic extension in western Mongolia: tectonic and petroleum systems implications

From magmatic arc to a post-accretionary setting: Late Palaeozoic granitoid plutons in the northwestern Trans-Altai Zone, Mongolia

Mapping of Lineaments and Knowledge Base Preparation using Geomatics Techniques for part of the Godavari and Tapi Basins, India: A Case Study

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