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首页> 外文期刊>Lithos: An International Journal of Mineralogy, Petrology, and Geochemistry >Late Carboniferous-Early Permian high- and low-Sr/Y granitoids of the Xing'an Block, northeastern China: Implications for the late Paleozoic tectonic evolution of the eastern Central Asian Orogenic Belt
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Late Carboniferous-Early Permian high- and low-Sr/Y granitoids of the Xing'an Block, northeastern China: Implications for the late Paleozoic tectonic evolution of the eastern Central Asian Orogenic Belt

机译：晚期石炭系 - 早期二叠纪高级和低级和低级SR / Y沉积物，东北角，东北部：对东部中央欧洲造山带的古生代构造演变的影响

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This study presents new zircon U-Pb geochronological, whole-rock geochemical, and zircon Hf isotopic data along with regional geological observations for five late Paleozoic granitic plutons within the Xing'an Block of northeastern China. These data provide insights into the petrogenesis of these granitoids and the late Paleozoic tectonic evolution of the region. The geochronological and geochemical data indicate that the intrusions were emplaced during two separate periods, with the resulting granites having distinct geochemical features. The early Late Carboniferous (321-310 Ma) granitic Lizishan (US), Xiaonangou (XNG), and Dabeigou (DBG) plutons have high Sr/Y values (33.15-126.73), with low concentrations of Y and heavy rare earth elements (HREE), indicating adakitic affinities. However, the XNG granodiorites contain higher concentrations of MgO, Cr, and Ni, and have higher Mg# values (57-59) than the other plutons. The latest Carboniferous-Early Permian (301-296 Ma) granitic Weilegesi (WLGS) and Wuyi (WY) plutons are high-K calc-alkaline, with low Sr/Y ratios (0.18-24.15), and show petrological and geochemical characteristics of I-type granites. In addition, the magmatic zircon crystals within these plutons yield positive epsilon(Hf)(t) values (+4.1 to +12.9) and juvenile two-stage model (T-DM2) ages (1056-499 Ma). The timing of emplacement and geochemical and isotopic compositions of the LZS and DBG granitoids are indicative of derivation from magmas generated by the partial melting of thickened lower crustal material, whereas the XNG granitoids were most likely formed from magmas generated by the partial melting of delaminated lower crustal material that subsequently interacted with mantle material during ascent. The latest Carboniferous-Early Permian low-Sr/Y granitoids may have formed from magmas generated by the partial melting of a dominantly juvenile amphibolite-facies crustal source under relatively low-pressure conditions, with these magmas subsequently undergoing variable degrees of fractional crystallization. Combining these new data with the results of previous research indicates that the terminal collision between the Xing'an and Songliao blocks occurred between the late Early and early Late Carboniferous, and the voluminous Late Carboniferous to Early Permian granitoids in the Xing'an Block are most likely related to post-collisional delamination. (C) 2018 Published by Elsevier B.V.
机译：本研究介绍了新的锆石U-PB地理论性，全岩地球化学和锆石同位素数据以及在中国东北兴安街区的五个古生代花岗岩的区域地质观察。这些数据提供了对这些花岗岩的纤维化和该区域的晚古生代构造演进的思想。地质学和地球化学数据表明，在两个单独的时期中施加了侵入，得到的花岗岩具有不同的地球化学特征。早期的石炭系（321-310 mA）花岗石丽氏山（美国），小康口（XNG）和Dabeigou（DBG）钚具有高Sr / Y值（33.15-126.73），具有低浓度的Y和重物稀土元素（ hree），表明adakitic亲和力。然而，XNG Granodiorites含有较高浓度的MgO，Cr和Ni，并且具有比其他型材更高的Mg＃值（57-59）。最新的石炭系 - 早期的二叠纪（301-296 mA）花岗岩妇女（WLG）和Wuyi（WY）钚是高k钙碱，低Sr / Y比率（0.18-24.15），显示出地球化学特征i型花岗岩。此外，这些果油中的岩浆锆石晶体产生正ε（HF）（T）值（+ 4.1至+ 12.9）和幼年两阶段模型（T-DM2）（1056-499 mA）。 LZS和DBG花岗岩的施加和地球化学和同位素组合物的定时指示由通过增厚的下地壳材料的部分熔化产生的磁带，而XNG沉积蔗油最有可能由通过分层的部分熔化产生的磁带形成随后在上升期间与披风材料相互作用的地壳材料。最新的石炭纪早期的PERIAN低SR / Y粉状可能由磁带形成，该磁带通过在相对低压条件下的占优势少年倍半角形地壳源的部分熔化产生的磁带，这些磁带随后经历了可变程度的分数结晶。将这些新数据与先前的研究结果相结合，表明兴安和松辽砌块之间的终端碰撞发生在早期和早期的石炭系之间发生，并且兴安块中的早期二叠膜的初期的石炭系是最多的可能与碰撞后分层有关。 （c）2018由elsevier b.v发布。

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