Geochemistry of rocks in the Anuy metamorphic dome, Sikhote-Alin: Composition of the protoliths and the possible nature of metamorphism

U‐Pb Dating and Lu‐Hf Isotopes of Detrital Zircons From the Southern Sikhote‐Alin Orogenic Belt, Russian Far East: Tectonic Implications for the Early Cretaceous Evolution of the Northwest Pacific Margin

“…The earliest granitoids are 131 to 124 Ma in age and are rare, only being found in the Nadanhada‐Bikin accretionary complex and the adjacent part of the Zhuravlevka turbidite basin (Figure a; Cheng et al, ; Grebennikov et al, ; Jahn et al, ). However, magmatism was interrupted between 130 and 110 Ma in the other belts, after which it was reactivated by rapid oblique Paleo‐Pacific subduction (the Izanagi Plate) and became quasi‐continuous from 110 Ma to 56 Ma (Jahn et al, ; Kruk et al, ; Tang et al, ).…”

“…The result also supports the possible existence of an old crust basement. However, the explanation of Sr‐Nd isotopes is argued because the remelting of the sedimentary rocks in Sikhote‐Alin, including abundant detritus from old continental blocks/cratons, can also explain the isotopic data (Khanchuk et al, ; Kruk et al, ).…”

“…There is also a magmatic gap between 130 and 110 Ma in the Sikhote‐Alin, probably due to plate motion parallel to the continental margin, which weakened the effect of subduction beneath the continent and thus reduced arc magmatism (Jahn et al, ; Khanchuk, ; Khanchuk et al, ; Maruyama, ). After ~110 Ma, magmatism in the Sikhote‐Alin became quasi‐continuous from 100 to 56 Ma as a result of westward subduction of the Izanagi and Pacific plates (Jahn et al, ; Kruk et al, ). The floral assemblages were different in various basins of the southern Sikhote‐Alin prior to this magmatic gap (Golozoubov et al, ).…”