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首页> 外文期刊>Journal of Asian earth sciences >Geochemistry and zircon U-Pb-Hf isotopes of the granitoids of Baolidao and Halatu plutons in Sonidzuoqi area, Inner Mongolia: Implications for petrogenesis and geodynamic setting
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Geochemistry and zircon U-Pb-Hf isotopes of the granitoids of Baolidao and Halatu plutons in Sonidzuoqi area, Inner Mongolia: Implications for petrogenesis and geodynamic setting

机译：内蒙古索尼佐奇地区宝利道和哈拉图岩体花岗岩的地球化学和锆石U-Pb-Hf同位素：对成岩作用和地球动力学背景的意义

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摘要

The Baolidao and Halatu plutons are located in the Northern Orogenic Belt (NOB) in Sonidzuoqi area of Inner Mongolia, which has an important significance for the tectonic evolution of Xing-Meng Orogenic Belt (XMOB). The two plutons have been intensively studied but the conclusions are still controversial. Combined with the previous study, this paper gives new geological data about the two correlative plutons for gaining a better understanding of their petrogenesis and the geodynamic setting. The Baolidao granitoids contain two different series, calc-alkaline series mainly formed in the Ordovician and high K calc-alkaline series mainly formed in the Carboniferous. The Halatu granites are formed in the Triassic and belong to high-K calc-alkaline series. This study got the zircon U-Pb ages of 316-322 Ma for the Baolidao granitoids and 233 ± 2 Ma for the Halatu syenogranites, respectively. In the tectonic discrimination diagrams, they mainly fall into the area of post-orogenic granites (POG). Hf isotopic analyses for the Baolidao granitoids (Sample BLD-1 and 3) shows ε_(H)f (t) = 3.0-14.0, with two-stage Hf model age (T_(DM2)) of 436-1138 Ma. The Halatu syenogranite (Sample HLT-1) also shows a depleted ε_(Hf) (t) = 3.8-8.2, with T_(dm2) of 741-1024 Ma, suggesting the major involvement of juvenile crustal components. The various ε_(Hf) values of the Carboniferous Baolidao and Triassic Halatu granitoids indicates a hybrid magma source of juvenile material with old crustal component, and the ε_(Hf) (t) values decrease from the Carboniferous to Triassic, suggesting the increasing proportion of old continental material during this period. Combined with the regional geology, the Carboniferous Baolidao granitoids are possibly not arc rocks, but originated from the post-collisional setting. The Triassic Halatu granites were formed in the subsequently extensional environment.
机译：宝力岛和哈拉图云母位于内蒙古索尼佐左旗地区北部造山带（NOB），对兴萌造山带（XMOB）的构造演化具有重要意义。对这两个小子进行了深入的研究，但结论仍存在争议。结合先前的研究，本文提供了有关这两种相关俯冲体的新地质数据，以更好地了解它们的成岩作用和地球动力学环境。宝力岛花岗岩类包含两个不同的系列，主要在奥陶纪形成的钙碱性系列和主要在石炭纪形成的高K钙碱性系列。哈拉图花岗岩形成于三叠纪，属于高钾钙碱性系列。这项研究得出宝力岛花岗岩类锆石的U-Pb年龄为316-322 Ma，Halatu人工花岗岩的锆石U-Pb年龄分别为233±2 Ma。在构造判别图中，它们主要属于造山后花岗岩（POG）区域。宝力岛花岗岩的Hf同位素分析（样品BLD-1和3）显示ε_（H）f（t）= 3.0-14.0，两阶段Hf模型年龄（T_（DM2））为436-1138 Ma。 Halatu片质花岗岩（样品HLT-1）也显示出ε_（Hf）（t）= 3.8-8.2耗尽，T_（dm2）为741-1024 Ma，表明主要涉及幼年地壳成分。石炭系宝利道和三叠系哈拉图花岗岩的各种ε_（Hf）值表明了具有旧地壳成分的幼岩的混合岩浆源，并且ε_（Hf）（t）值从石炭系到三叠纪逐渐减小，表明在此期间，大陆材料变老了。结合区域地质，石炭系宝利道花岗岩可能不是弧形岩石，而是起源于碰撞后环境。三叠纪哈拉图花岗岩是在随后的伸展环境中形成的。

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