Geochronology and geochemistry of early Paleozoic intrusive rocks from the Khanka Massif in the Russian Far East: Petrogenesis and tectonic implications
Geochronology and geochemistry of early Paleozoic intrusive rocks from the Khanka Massif in the Russian Far East: Petrogenesis and tectonic implications
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俄罗斯远东兴凯地块早古生代侵入岩的年代学和地球化学：岩石成因和构造意义
DOI：
10.1016/j.lithos.2017.12.004
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发表时间：
2018-02
期刊：
影响因子：
3.5
通讯作者：
Sorokin A.A.
中科院分区：
文献类型：
--
作者：
Xu Ting;Xu Wenliang;Wang Feng;Ge Wenchun;Sorokin A.A.
本文介绍了俄罗斯远东地区汉卡地块早古生代侵入岩的新的年代学和地球化学数据，旨在阐明汉卡地块的古生代演化和构造属性。新的锆石U-Pb数据表明，汉卡地块早古生代岩浆活动至少可划分为4个阶段：~ 502、~ 492、462-445和~ 430 Ma。~ 502 Ma辉石闪长岩含SiO_2 58.28- 59.64wt%，MgO 2.84- 3.69wt%，Cr、Ni含量较高。负的εHf（t）值（− 1.8 ~ − 0.4），沿着，以及其他地球化学数据，表明原始岩浆来源于镁铁质下地壳的部分熔融，并加入了地幔物质。~ 492 Ma正长花岗岩具有较高的SiO2和K2 O含量，并显示Eu正异常，表明其原始岩浆是在较低压力下由下地壳部分熔融形成的。445 Ma富钠奥长花岗岩具有高Sr/Y比值和正εHf（t）值（+ 1.8 ~+ 3.9），表明原始岩浆是由加厚的含水镁铁质地壳部分熔融形成的。~ 430 Ma花岗岩类具有较高的SiO2和K2 O含量，锆石εHf（t）值为-5.4 ~+5.8，两期模式年龄为1757-1045 Ma，表明原始岩浆是元古代下地壳物质不均匀部分熔融的产物。这些早古生代侵入组合的地球化学表明，它们的形成在一个活跃的大陆边缘设置与古大洋板块的俯冲下的兴卡地块。εHf（t）值随着纬度的增加呈现出越来越负的趋势，揭示了汉卡地块下地壳的横向不均匀性。岩浆活动的区域对比表明，俄罗斯远东地区的兴卡地块与松嫩-张广才岭地块而不是相邻的佳木斯地块具有构造亲缘关系。
This paper presents new geochronological and geochemical data for early Paleozoic intrusive rocks from the Khanka Massif in the Russian Far East, with the aim of elucidating the Paleozoic evolution and tectonic attributes of the Khanka Massif. New U–Pb zircon data indicate that early Paleozoic magmatism within the Khanka Massif can be subdivided into at least four stages: ~ 502, ~ 492, 462–445, and ~ 430 Ma. The ~ 502 Ma pyroxene diorites contain 58.28–59.64 wt% SiO2, 2.84–3.69 wt% MgO, and relatively high Cr and Ni contents. Negative εHf(t) values (− 1.8 to − 0.4), along with other geochemical data, indicate that the primary magma was derived from partial melting of mafic lower crust with the addition of mantle material. The ~ 492 Ma syenogranites have high SiO2and K2O contents, and show positive Eu anomalies, indicating the primary magma was generated by partial melting of lower crust at relatively low pressure. The ~ 445 Ma Na-rich trondhjemites display high Sr/Y ratios and positive εHf(t) values (+ 1.8 to + 3.9), indicating the primary magma was generated by partial melting of thickened hydrous mafic crust. The ~ 430 Ma granitoids have high SiO2and K2O contents, zircon εHf(t) values of − 5.4 to + 5.8, and two-stage model ages of 1757–1045 Ma, suggesting the primary magma was produced by partial melting of heterogeneous Proterozoic lower crustal material. The geochemistry of these early Paleozoic intrusive assemblages indicates their formation in an active continental margin setting associated with the subduction of a paleo-oceanic plate beneath the Khanka Massif. The εHf(t) values show an increasingly negative trend with increasing latitude, revealing a lateral heterogeneity of the lower crust beneath the Khanka Massif. Regional comparisons of the magmatic events indicate that the Khanka Massif in the Russian Far East has a tectonic affinity to the Songnen–Zhangguangcai Range Massif rather than the adjacent Jiamusi Massif.
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