Age, petrogenesis, and tectonic implications of the late Permian magmatic rocks in the Middle Gobi volcanoplutonic Belt , Mongolia

The Mongol–Okhotsk Belt, the youngest segment of Central Asian Orogenic Belt, was formed by the evolution and closure of the Mongol–Okhotsk Ocean. The oceanic closure formed two volcanoplutonic belts: Selenge Belt in the north and the Middle Gobi Belt in the south (in present day coordinates). Howev...

Full description

Saved in:

Bibliographic Details
Published in:	The island arc Vol. 31; no. 1
Main Authors:	Ganbat, Ariuntsetseg, Tsujimori, Tatsuki, Miao, Laicheng, Safonova, Inna, Pastor‐Galán, Daniel, Anaad, Chimedtseren, Aoki, Shogo, Aoki, Kazumasa, Chimedsuren, Munkhnasan
Format:	Journal Article
Language:	English
Published:	Tokyo Wiley Subscription Services, Inc 01-01-2022
Subjects:	Amphibolites Andesite Belts Biotite Continental margins Evolution Gabbro Geochemistry Geochronology Granite Isotopes Juveniles Lava Melting Ocean basins Orogeny Permian Petrogenesis Rhyolite Rhyolites Rock Rocks Sediments Subduction Subduction (geology) Tectonics Zircon
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	The Mongol–Okhotsk Belt, the youngest segment of Central Asian Orogenic Belt, was formed by the evolution and closure of the Mongol–Okhotsk Ocean. The oceanic closure formed two volcanoplutonic belts: Selenge Belt in the north and the Middle Gobi Belt in the south (in present day coordinates). However, the origin and tectonic evolution of the Mongol–Okhotsk Belt in general, and the origin and formation age of the Middle Gobi Belt in particular, remain enigmatic. To better understand the history of the magmatic activity in the Middle Gobi Belt, we conducted geochemical, U–Pb geochronological, zircon Hf, and whole‐rock Nd isotopic analyses of samples from the Mandalgovi volcanoplutonic suite, the major component of the Middle Gobi Belt. Our results show that the plutonic rock consists of ~285 Ma gabbro, ~265 Ma biotite‐granite and ~250 Ma hornblende‐granodiorite. The volcanic counterpart is represented by a Permian Sahalyn gol rhyolite and ~247 Ma Ikh khad andesite. The geochemical compositions of biotite‐granite and hornblende‐granodiorite indicate that their precursors were metagraywacke and amphibolite, respectively. They are characterized by positive whole‐rock ε Nd ( t ) and zircon ε Hf ( t ) values, indicating juvenile protoliths. The gabbro was derived by partial melting of a metasomatized lithospheric mantle source in a supra‐subduction setting. The biotite‐granite and Sahalyn gol rhyolite are formed by remelting of sediments in an inter‐arc extension setting. Later the hornblende‐granite and Ikh khad volcanic were emplaced at a volcanic arc formed by the subduction of the Mongol–Okhotsk Ocean. We conclude that the magmatic rocks of the Middle Gobi Belt formed in an active continental margin setting. Considering the consistent distribution of coeval arc‐derived magmatic formations along the southern margin of the Mongol–Okhotsk Belt, the oceanic basin was closed in a relatively simultaneous manner.
ISSN:	1038-4871 1440-1738
DOI:	10.1111/iar.12457