Accretionary Tectonics of Rock Complexes in the Western Margin of the Siberian Craton

Geodynamic Model of the Neoproterozoic Evolution of the Yenisei Paleosubduction Zone (Western Margin of the Siberian Craton), Russia

“…In the same manner, the Ishimba-Tatar regional shear zone was identified in the junction zone of the Central and Eastern blocks of the ridge east of the Yenisei shear zone; this one was traced to the Kan River (in the south of the ridge). The Yenisei shear zone is interpreted as a likely continuation of the Baikal-Yenisei Fault (Main Sayan Fault) of the Sayan Region and, therefore, a fragment of the structure bordering the Siberian Craton from the west from Lake Baikal to the Kara Sea [18]. The discontinuous structure is clearly traced by geophysical data to great depth with the fault plane dipping to the west [7].…”

“…A large part of the rocks form a subductionaccretionary complex, where they occur as tectonic slabs, lenses, or blocks of different size and composition in the serpentinite mélange. The existence of the Middle Neoproterozoic Isakovka and adjacent Predivinsk island-arc systems to the west of the Siberian Craton at the latitudes of the Yenisei Ridge was substantiated in [3,14,17,18,36]. Study of the Isakovka ophiolite belt allowed the Late Neoproterozoic stage of the formation of the Paleo-Asian Ocean to be reconstructed [1,3,12,14,18,26,28,36].…”

“…The junction zone of the Pre-Mesozoic basement complexes of the West Siberian Plate with the Yenisei Ridge has long attracted the attention of geologists and geophysicists as a testing ground for deciphering the nature and paleogeodynamic evolution of the Yenisei tectonic belt on the western boundary of the Siberian Craton and the Paleo-Asian Ocean in the Neoproterozoic [18,22,28,30]. Of particular interest is the zone of pronounced positive magnetic anomalies about 40 km in width, which stretches subparallel to the western margin of the Siberian Platform for hundreds of kilometers along the Yenisei River.…”

“…Of particular interest is the zone of pronounced positive magnetic anomalies about 40 km in width, which stretches subparallel to the western margin of the Siberian Platform for hundreds of kilometers along the Yenisei River. The zone is confined to the western flank of the Sayan-Yenisei accretionary belt and to its northern continuation, the Yenisei tectonic belt; it is conventionally considered [4,14,17,18,26,28,36,40] a collisional accretionary system on the margin of the Siberian Platform (Fig. 1).…”

Первые Данные О Синаккреционном Умереннобарическом Метаморфизме На Западной Окраине Сибирского Кратона (Енисейский Кряж)

“…Взаимоотношение океанической и континентальной литосферы на конвергентных границах плитодна из актуальных проблем для расшифровки истории геологического развития складчатого обрамления краевых частей кратонов [1]. Граница палеоокеанпалеоконтинент и зона их сочленения в глобальном масштабе важны для понимания истории ранних этапов эволюции Палеоазиатского океана [2][3][4].…”