Origin of the I- and S-type tonalite magma in the Satsunai-gawa Shichino-sawa river region of the Hidaka metamorphic belt, Hokkaido, northern Japan: Inferences from Sr and Nd isotopic compositions

U–Pb zircon ages of the Nakanogawa Group in the Hidaka Belt, northern Japan: Implications for its provenance and the protolith of the Hidaka metamorphic rocks

“…Kemp et al () also suggested that the 206 Pb/ 238 U ages of 37 Ma and 35 Ma indicate a relatively old metamorphic event (Kojima & Shimura, ; Figure ), and also report a range of zircon grain core ages from the granulite facies, with a dominant peak at 60–50 Ma ( 206 Pb/ 238 U age) and other peaks at 2 744 Ma, 2 689 Ma, 2 599 Ma, 2 068 Ma, 1 888 Ma, and 789 Ma ( 207 Pb/ 206 Pb ages) and at 350–330 and 72 Ma ( 206 Pb/ 238 U ages). The zircons with ages of 350–330 Ma and 72 Ma can be derived from Carboniferous and Late Cretaceous igneous rocks, possibly from the Sea of Okhotsk (Gnibidenko & Khvedchuk, ), and the grains yielding the oldest ages of 2 744 Ma, 2 689 Ma, 2 599 Ma, 2 068 Ma, and 1 888 Ma (2.7 Ga, 2.6 Ga, 2.1 Ga, and 1.9 Ga) may be derived from the Siberian Craton (Poller et al, ) or the North China Craton (Wan et al, ).…”

“…Age summary of rocks in the Hidaka Mountains and surrounding area based on Kemp et al (), Kiminami et al (, ), Kojima and Shimura (), Nanayama et al (), Niida and Kito (), Ueda et al (, ), Usuki et al (), and Watanabe and Iwata (, ). The orange box indicates strata that may comprise protoliths of the upper sequence and the brown box indicates strata that may comprise protoliths of the lower sequence of the Hidaka metamorphic rocks.…”

“…1.9 Ga (n = 1) 2.2 Ga (n = 1) 2.7 Ga (n = 1) 651 Ma (n = 1) 789 Ma (n = 1) 1.9 Ga (n = 3) 2.1 Ga (n = 1) 2.6 Ga (n = 1) 2.7 Ga (n = 2) Relative probability Number The main turbidite facies, which lacks N-MORB greenstone, is limited to the Yubetsu Group, which is distributed along the eastern edge of the northern Hidaka Belt (Figure 1). FIGURE 11 Age summary of rocks in the Hidaka Mountains and surrounding area based on Kemp et al (2007), Kiminami et al (1990aKiminami et al ( , 1990b, Kojima and Shimura (2014), Nanayama et al (1993), Niida and Kito (1986), Ueda et al (2000Ueda et al ( , 2001, Usuki et al (2006), and Iwata (1985, 1987). The orange box indicates strata that may comprise protoliths of the upper sequence and the brown box indicates strata that may comprise protoliths of the lower sequence of the Hidaka metamorphic rocks.…”

“…Usuki et al (2006) can be derived from the Siberian Craton (Poller et al, 2005) or the North China Craton (Wan et al, 2011). Kemp et al (2007) also suggested that the 206 Pb/ 238 U ages of 37 Ma and 35 Ma indicate a relatively old metamorphic event (Kojima & Shimura, 2014;Figure 11), and also report a range of zircon grain core ages from the granulite facies, with a dominant peak at (Gnibidenko & Khvedchuk, 1982), and the grains yielding the oldest ages of 2 744 Ma, 2 689 Ma, 2 599 Ma, 2 068 Ma, and 1 888 Ma (2.7 Ga, 2.6 Ga, 2.1 Ga, and 1.9 Ga) may be derived from the Siberian Craton (Poller et al, 2005) or the North China Craton (Wan et al, 2011). Thus, zircon U-Pb ages from the lower sequence also may correspond to those of the Nakanogawa Group (Figure 11), which points toward both possibly having the same igneous source.…”

Supplemental Material: Subduction of the Izanagi-Pacific Ridge–transform intersection at the northeastern end of the Eurasian plate

“…The Partition coefficients and modal melting proportions from Sen and Dunn (1994;equation 6 at 1.5 GPa) were used in the calculations, and the restite unmixing model of White and Chappell (1977) were adopted. The composition of the sediment component is an averaged composition of metasediments and sediments (Nakanogawa Group) from Kojima and Shimura (2014). The results are plotted in chondrite-normalized REE patterns (normalizing values from Sun and McDonough, 1989).…”