吉林大学学报(地球科学版) ›› 2018, Vol. 48 ›› Issue (4): 1085-1104.doi: 10.13278/j.cnki.jjuese.20170179
张强, 丁清峰, 宋凯, 程龙
Zhang Qiang, Ding Qingfeng, Song Kai, Cheng Long
摘要: 洪水河铁矿区位于东昆仑造山带中段北带。在野外地质工作的基础上,对狼牙山组近矿围岩千枚岩开展了岩相学、地球化学、LA-ICP-MS碎屑锆石U-Pb年代学及Hf同位素研究工作。主微量元素结果显示,狼牙山组千枚岩的原岩可能是一套来自壳源的成熟度高的砂岩,古气候古地理特征是温暖湿润环境,经历了中高程度的化学风化作用,物源为碱性长石含量较低的长英质岩石,沉积构造环境可能处于被动大陆边缘。碎屑锆石年代学研究结果显示,本区狼牙山组千枚岩的沉积年龄可能为(788±9)~(515.2±4.4)Ma,说明其沉积时代并非前人认为的蓟县系。洪水河铁矿床应该是当时全球性含铁建造的实例之一,反映的是Sturtian冰期的结束。另外,这些碎屑锆石的εHf(t)值为-30.4~8.3,说明Hf同位素来源组成具有极大的非均一性,两阶段模式年龄为3 596~1 448 Ma,具有正和负的εHf(t)值,说明这类锆石的母岩中既有新生的地壳物质,又有再造的古老地壳,可能分别对应中元古代的新生地壳和太古宙地壳的再造。通过对锆石年龄分类讨论,并将碎屑锆石年龄与其邻区出露的老地层和岩体时代进行对比,推测太古宙基底物质、白沙河岩组、小庙群、万宝沟群及中元古代晚期在东昆仑地区形成的中酸性岩体为其物源。
中图分类号:
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