REE and Nd-Sr isotope provenance signatures in clastic sedimentary terranes and geological evolution of the Asia-Pacific margin

本州、北海道和韩国主要地质体的砂岩-泥岩套在全岩地球化学组成上存在显著差异。在本州，岛东-田边、三巴川和黑川组显示了相对演化的CIA或ACM沉积物的主要、痕量和稀土元素特征。球粒陨石归一化稀土分异，La_N/Yb_N平均值分别为10.4 ~ 10.9、8.2和9.2，Gd_N/Yb_N比值分别为1.72 ~ 1.33、1.45和1.71。较低的Gd_N/Yb_N比值表明锆石和石榴石的富集。负Eu异常出现在所有三个组（平均Eu/Eu^* 0.77-0.73、0.63和0.79）。高La_N/Yb_N比值（平均11.00）和较大的Eu/Eu负异常（0.64）表明北海道大岛硅质地层是相对成熟的烃源岩。下叶左组—伊东纳普带下部岩石的下La_N/Yb_N和Eu/Eu^*分别为9.74和0.69，上部进一步降低，分别为6.76和0.78，反映了较高的基性成分。庆尚超级群（韩国）La_N/Yb_N平均值（13.5）大于相关的关门群（8.8），但Eu/Eu*平均值（0.78 ~ 0.79）相当。和模型(年龄从Shimanto，三巴川。大岛和野佐-伊东纳普地形对比明显。Shimanto模式的年龄范围为0.74 ~ 1.6 Ga，但大多数在1.0 ~ 1.4 Ga之间，介于潜在的Ryoke和Higo Ryoke地源之间。两个三巴川片岩的模型年龄分别为1.04和1.2 Ga，支持了一个石曼托原岩。大岛陆块模式年龄明显更老（1.44 ~ 1.85 Ga），与可能的源区扬子克拉通的年龄相当。下Yezo-Idonnappu组的模式年龄一直较年轻（1.05-1.31 Ga），上Yezo-Idonnappu组的模式年龄更年轻（0.71-0.93 Ga），可能反映了增生杂岩内海洋地壳循环的贡献。元素丰度与日本造山带上地壳平均值（JOAUC）的正态化显示，虽然稀土元素（REE）和高铁元素（HFSE）总体上比较好，但在某些组中，某些元素（如fe、Mn、Mg、Ca、P、Sc、V、Cr和Ni）呈负异常。在Oshima、Yezo-Idonnappu和Shimanto地层中，砂岩的耗损比泥岩更明显。这些异常表明，JOAUC平均可以对某些元素进行修正。少

Sandstone-mudstone suites from major terranes in Honshu, Hokkaido and Korea show significant contrasts in whole rock geochemical compositions. In Honshu, the Shimanto-Tanabe, Sambagawa, and Kurosegawa suites show major, trace, and rare earth element signatures typical of relatively evolved CIA or ACM sediments. Chondrite-normalized REE patterns are fractionated, with average La_N/Yb_N of 10.4-10.9,8.2, and 9.2, and Gd_N/Yb_N ratios of 1.72-1.33,1.45, and 1.71, respectively. The lower Gd_N/Yb_N ratios suggest concentration of zircon and garnet. Negative Eu anomalies occur in all three suites (average Eu/Eu^* 0.77-0.73,0.63, and 0.79, respectively). High La_N/Yb_N ratios (average 11.00) and larger negative Eu/Eu anomalies (0.64) in the silicic Oshima terrane (Hokkaido) indicate a relatively mature source. Lower La_N/Yb_N and Eu/Eu^* (average 9.74 and 0.69) in lower Yezo Group-Idonnappu Zone rocks decrease further in the upper part (6.76 and 0.78), reflecting a greater mafic component. Av … More erage La_N/Yb_N ratio (13.5) in the Gyeongsang Supergroup (Korea) is greater than in the correlative Kanmon Group (8.8), but average Eu/Eu* values are comparable (0.78-0.79). Nd model (ages from the Shimanto, Sambagawa. Oshima and Yezo-Idonnappu terranes contrast significantly. Shimanto model ages range from 0.74 to 1.6 Ga, although most lie between 1.0-1.4 Ga, intermediate between potential Ryoke and Higo Ryoke terrane sources. Two Sambagawa schists yield comparable model ages of 1.04 and 1.2 Ga, lending support to a Shimanto protolith. Oshima terrane model ages are significantly older (1.44-1.85 Ga), comparable with values for the Yangtze craton, their probable source. Model ages in the lower Yezo-Idonnappu suite are consistently younger (1.05-1.31 Ga), and are younger still (0.71-0.93 Ga) in upper Yezo-Idonnappu rocks, possibly reflecting contributions from oceanic crust recycled within the accretionary complex. Normalization of elemental abundances against average Japan Orogenic are upper crust(JOAUC) shows negative anomalies for some elements (e.g.Fe,Mn,Mg,Ca,P,Sc,V,Cr and Ni) in some suites, although the REE and HFSE generally compare well. Depletion is most marked in the Oshima, Yezo-Idonnappu, and Shimanto terranes, and in sandstones compared to mudstones. The anomalies suggest the JOAUC average could be amended for some elements. Less