本文選題：冀東　切入點(diǎn)：新太古代　出處：《地質(zhì)通報(bào)》2016年01期 　論文類型：期刊論文

【摘要】：報(bào)道了冀東黃柏峪—羊崖山地區(qū)太古宙變質(zhì)輝長巖、黑云斜長片麻巖、片麻狀二長花崗巖、片麻狀富鉀花崗巖等不同類型變質(zhì)巖漿巖(8個樣品)的SHRIMP鋯石U-Pb定年結(jié)果。首次發(fā)現(xiàn)3.1Ga二長花崗巖,黑云斜長片麻巖形成時代約為3.0Ga。變質(zhì)輝長巖的侵入時代很可能為新太古代晚期,存在少量3.2~3.6Ga捕獲鋯石。幾乎所有巖石樣品都記錄了約2.5Ga的變質(zhì)鋯石年齡。結(jié)合前人資料認(rèn)為,(1)冀東地區(qū)新太古代晚期構(gòu)造熱事件十分發(fā)育,被認(rèn)為與地幔軟流圈上涌導(dǎo)致的巖漿板底墊托有關(guān);(2)冀東地區(qū)中太古代以前的陸殼物質(zhì)廣泛分布,黃柏峪—羊崖山地區(qū)很可能存在一古老陸核。
[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.
【作者單位】： 中國地質(zhì)科學(xué)院地質(zhì)研究所北京離子探針中心;
【基金】：國家自然科學(xué)基金項(xiàng)目(批準(zhǔn)號:41472169) 中國地質(zhì)調(diào)查局項(xiàng)目(編號:12120114021301,1212011220465,1212011120142,1212010811033)
【分類號】：P588.11;P588.3

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