10.6084/m9.figshare.3454460.v1
Dmitry P. Gladkochub
Dmitry P.
Gladkochub
Tatiana V. Donskaya
Tatiana V.
Donskaya
Michael T.D. Wingate
Michael T.D.
Wingate
Ulrike Poller
Ulrike
Poller
Alfred Kröner
Alfred
Kröner
Valentin S. Fedorovsky
Valentin S.
Fedorovsky
Anatoliy M. Mazukabzov
Anatoliy M.
Mazukabzov
Wolfgang Todt
Wolfgang
Todt
Sergei A. Pisarevsky
Sergei A.
Pisarevsky
Petrology, geochronology, and tectonic implications of <em>c</em>. 500 Ma metamorphic and igneous rocks along the northern margin of the Central Asian Orogen (Olkhon terrane, Lake Baikal,
Siberia)
Geological Society of London
2016
island arc mafic
granulite
detrital zircon cores
500 Ma
Central
Siberian craton
metasediment
Barguzin microcontinent
Olkhon terrane
Palaeozoic
Orogenic Belt transition zone
Lake Baikal region
Geology
2016-06-21 12:07:58
Dataset
https://geolsoc.figshare.com/articles/dataset/Petrology_geochronology_and_tectonic_implications_of_em_c_em_500_Ma_metamorphic_and_igneous_rocks_along_the_northern_margin_of_the_Central_Asian_Orogen_Olkhon_terrane_Lake_Baikal___Siberia_/3454460
<p>A significant portion of the continental crust of northern Eurasia is thought to have formed during the evolution of the Central
Asian Orogenic Belt at the time of accretion of continental terranes and island arcs. Records of this event are well preserved
within the Siberian craton–Central Asian Orogenic Belt transition zone in Lake Baikal region, particularly in the Olkhon terrane.
Our results establish granulite-facies conditions for peak metamorphism in the Olkhon terrane, and indicate that the granulites
were derived from island arc mafic volcanic rocks and back-arc basin sediments. Sensitive high-resolution ion microprobe dating
of metamorphic zircons from two mafic granulites yielded <sup>238</sup>U/<sup>206</sup>Pb ages of 507 ± 8 and 498 ± 7 Ma, and magmatic zircons from syntectonic syenite yielded an age of 495 ± 6 Ma. The main metamorphic
event occurred at about 500 Ma, and was probably related to collision of the Barguzin microcontinent with the Siberian craton.
Ages from 535 to 2750 Ma for detrital zircon cores in early Palaeozoic metasediments of the Olhkon terrane were obtained.
Archaean ages of detrital zircons in such metasediments suggest that the Barguzin microcontinent was originally part of the
Aldan Province of the Siberian craton that was detached in late Mesoproterozoic, and reattached to the craton during early
Palaeozoic collision.
</p>