... of the Siberian craton and (2) the presence of a product of this magmatism in the Anga–Talanchan island arc, namely, the Krestovsky massif with gabbro-diorite to granite phases. This suggests subduction of the Paleoasian oceanic crust under the island arc before the collision. The geophysical data showed a steep...

...Fig. 3. Rb-Sr isochron for rocks of the Krestovsky Massif. Bulk samples of gabbro-diorites (PO1925), granodiorites (PO1593–P01784), and granites (PO1738–PO1924). ...

...Fig. 1. Location of the Shara-Nur granite-gneiss dome and Krestovsky massif in the Ol’khon region. 1 , granitoids of the Khaidai complex; 2 , gabbroids of the Ozersky complex; 3 , large granite-gneiss domes of the Shara-Nur complex, Ol’khon Group; 4 , gneiss and 5 , marble-schist tectonic...

...Fig. 5. Rb-Sr isochrons for rocks and minerals from the Krestovsky Massif. 1 — quartz diorites, 2 — granodiorites, 3 — plagioclase, 4 — biotites, 5 — diorite from schliere-like skialith at the endocontact of the massif (schlieren). For other explanations see the text. ...

...Fig. 2. SiO 2 –(Na 2 O + K 2 O) classification diagram for Paleozoic granitoids of the West Stanovoy SFZ. Kr — Krestovsky Massif; SLIB — southern Lower Ingoda batholith; NLIB — northern Lower Ingoda batholith; UT — Ulentui-Torga site; VD — Vershino-Darasunsky Massif; Ya — Yamnaya Massif; MB...

...A.V. Lavrenchuk; E.V. Sklyarov; A.E. Izokh; A.B. Kotov; E.B. Sal’nikova; V.S. Fedorovsky; A.M. Mazukabzov Abstract We provide new geochemical and isotope–geochronological evidence for gabbro intrusions of the Krestovsky zone in the Olkhon composite terrane. The intrusions belong to the Birkhin...

..., particularly in the Maloe More zone, where diorites and granodiorites transformed into diorite- and granite-gneisses. They compose multiphase gabbrodiorite-diorite-granodiorite and granodiorite-granite massifs (Krestovsky and Aral) and sheet-like intrusions of subalkaline and layered gabbro (Ozersky...

... massif, which consists of two merged volcanoes: Ushkovsky with an altitude of 3943 m and Krestovsky with an altitude of 4108 m. To the southwest and northeast of this massif, there are cinder cones that mark another lineament ( Fig. 1 b ). This structure, which seems to be almost parallel...

... – structure-tectonic zones, 4 – collisional suture, 5 – gabbro massifs: 1 – Bugul’deika, 2 – Talovka, 3 – Krestovsky, 4 – Ust’-Krestovsky, 5 – Birkhin, 6 – Ulan-Nur. Inset shows the location of the study area. ...