| 大兴安岭早白垩世火山岩的时空分布特征 |
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| 引用本文： | 杨晓平,江斌,杨雅军.大兴安岭早白垩世火山岩的时空分布特征[J].地球科学,2019,44(10):3237-3251. |
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| 作者姓名： | 杨晓平 江斌 杨雅军 |
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| 作者单位： | 中国地质调查局沈阳地质调查中心, 辽宁沈阳 110034 |
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| 基金项目： | 中国地质调查局项目DD20160345-17科技部"深地资源勘查开采"重点专项项目2017YFC0601305 |
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| 摘 要： | 为进一步了解大兴安岭早白垩世火山岩与古太平洋构造关系，通过大兴安岭地区1:100万地质编图工作，对大兴安岭中生代火山地层进行了重新厘定.依据岩石组合、古生物、接触关系及区域对比，结合年代学（锆石U-Pb、40Ar/39Ar测年数据、古生物）资料在原晚侏罗世火山岩中解体出大量的早白垩世早期火山岩（145~130 Ma）.通过岩石组合、时空展布分析，探讨了大兴安岭地区145~100 Ma形成的早白垩世火山岩与古太平洋构造的成因关系.研究表明，早白垩世早期火山岩（145~130Ma）和早白垩世晚期火山岩（130~100 Ma）均呈NNE向展布，空间上具有密切的共生关系.火山岩时代总体具有由北西向南东变新趋势，与古太平洋板块早白垩世向东亚大陆下的后退式俯冲作用吻合，记录了早白垩世伊泽奈岐板块向东亚大陆俯冲事件，表明大兴安岭早白垩世火山岩（145~100 Ma）主要形成于伊泽奈岐板块向东亚大陆俯冲背景下.
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| 关 键 词： | 大兴安岭 早白垩世 火山岩 古太平洋构造 岩石学 |
| 收稿时间： | 2019-04-15 |
Spatial-Temporal Distribution Characteristics of Early Cretaceous Volcanic Rocks in Great Xing'an Range Area |
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| Abstract: | In order to further understand the relationship between the Mesozoic volcanic rocks and the Paleo-Pacific tectonics in the Great Xing'an Range area, in this study, it redetermines the Mesozoic volcanic strata in the Great Xing'an Range area through the regional 1:1 000 000 scale geological mapping work. A large number of Early Cretaceous volcanic rocks were identified from previous Late Jurassic volcanic units according to the rock association, paleontology, contact relationships and regional comparison, combining with geochronology files (including zircon U-Pb, 40Ar/39Ar and paleontology information). The relationship between the Early Cretaceous volcanic rocks formed within 145-100 Ma in the Great Xing'an Range area and Paleo-Pacific Tectonics is discussed by rock association and spatial-temporal distribution characteristics. It is found that both Early Cretaceous volcanic rocks of the early stage(145-130 Ma) and the later stage(130-100 Ma) are distributed in NNE direction, and with close special spatial co-existence relationship. The geochronology trend of the volcanic rocks becomes increasingly younger from northwest to southeast, which is in accordance with the backward subduction process of the Paleo-Pacific plate beneath the East Asian continent since the Early Cretaceous, recording the subduction event of Izanagi plate to the East Asian continent as well, indicating that the Early Cretaceous volcanic rocks (145-100 Ma) in the Great Xing'an Range area formed under the subduction setting dominated by the Izanagi plate beneath the East Asian continent. |
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