冀东黄柏峪—羊崖山地区太古宙岩浆作用和变质作用——SHRIMP锆石U-Pb定年

发布时间：2018-03-09 10:33

本文选题：冀东　切入点：新太古代　出处：《地质通报》2016年01期 　论文类型：期刊论文

【摘要】：报道了冀东黄柏峪—羊崖山地区太古宙变质辉长岩、黑云斜长片麻岩、片麻状二长花岗岩、片麻状富钾花岗岩等不同类型变质岩浆岩(8个样品)的SHRIMP锆石U-Pb定年结果。首次发现3.1Ga二长花岗岩,黑云斜长片麻岩形成时代约为3.0Ga。变质辉长岩的侵入时代很可能为新太古代晚期,存在少量3.2~3.6Ga捕获锆石。几乎所有岩石样品都记录了约2.5Ga的变质锆石年龄。结合前人资料认为,(1)冀东地区新太古代晚期构造热事件十分发育,被认为与地幔软流圈上涌导致的岩浆板底垫托有关;(2)冀东地区中太古代以前的陆壳物质广泛分布,黄柏峪—羊崖山地区很可能存在一古老陆核。
[Abstract]:Archean metamorphic gabbro, black cloud plagioclase gneiss, schneiss monzogranite in Huangbaiyu-Yangyashan area, eastern Hebei Province, are reported. SHRIMP zircon U-Pb dating results of different types of metamorphic magmatic rocks (8 samples), such as granitic granites, and gneissic potash rich granites. The age of formation of the gneiss is about 3.0 Ga. The intrusive age of metamorphic gabbro is probably the late NeoArchaean. There is a small amount of 3.2Ga-3.6Ga zircon trapping. Almost all rock samples have recorded a metamorphic zircon age of about 2.5Ga. Combined with previous data, it is considered that the late NeoArchean tectonic thermal events in eastern Hebei are well developed. It is considered to be related to the upwelling of the mantle asthenosphere. (2) the continental crust material before the Archaeozoic was widely distributed in the eastern Hebei area, and there may be an ancient continental nucleus in the Huangbayu-Yangyashan area.
【作者单位】：中国地质科学院地质研究所北京离子探针中心;
【基金】：国家自然科学基金项目(批准号:41472169) 中国地质调查局项目(编号:12120114021301,1212011220465,1212011120142,1212010811033)
【分类号】：P588.11;P588.3

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