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Structure and petrology of the Altan Uul Ophiolite; new evidence for a Late Carboniferous suture in the Gobi Altai, southern Mongolia

Stephen Rippington, Dickson Cunnington and Richard England
Structure and petrology of the Altan Uul Ophiolite; new evidence for a Late Carboniferous suture in the Gobi Altai, southern Mongolia
Journal of the Geological Society of London (May 2008) 165 (3): 711-723

Abstract

Altan Uul and Nemegt Uul are mountain ranges in southern Mongolia containing polydeformed Mid- to Late Palaeozoic sedimentary, volcanic and metamorphic rocks uplifted at a restraining bend along the Gobi-Tien Shan left-lateral strike-slip fault system. Altan and Nemegt Uul contain part of an intra-oceanic island arc that was active during the Carboniferous. Thrust-bound sequences of highly fractured pillow basalt, cumulate gabbro, peridotite, serpentinite and jasperoid occur directly north of the arc rocks in at least three discrete belts and are interpreted to be fragments of an ophiolite. Metamorphosed marine sediments that have undergone intense contractional strain lie north of, and structurally below, the ophiolitic rocks. The gabbros within the ophiolitic sequences have undergone prograde metamorphic reactions consistent with an ocean-floor environment, and trace element analyses are similar to those from cumulate gabbros of the Oman ophiolite. Combined field and petrological evidence suggests that there is an east-west-trending south-dipping Late Carboniferous suture in Altan and Nemegt Uul that may be regionally correlated in the southern Gobi Altai region. This proposed suture represents a new and important tectonic boundary between tectonostratigraphic terranes in southern Mongolia, requiring modification of existing models of Late Palaeozoic terrane accretion in the Central Asian Orogenic Belt.


ISSN: 0016-7649
EISSN: 2041-479X
Coden: JGSLAS
Serial Title: Journal of the Geological Society of London
Serial Volume: 165
Serial Issue: 3
Title: Structure and petrology of the Altan Uul Ophiolite; new evidence for a Late Carboniferous suture in the Gobi Altai, southern Mongolia
Affiliation: University of Leicester, Leicester, United Kingdom
Pages: 711-723
Published: 200805
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 49
Accession Number: 2008-082543
Categories: Structural geologyIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, geol. sketch maps
N42°30'00" - N43°40'00", E100°15'00" - E100°34'60"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 200824
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