冀北崇礼红旗营子群的岩石组合及时代归属

发布时间：2018-01-27 00:37

  本文关键词： 岩石组合 时代归属 红旗营子群 崇礼 冀北　出处：《成都理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：冀北崇礼红旗营子群位于崇礼—赤城断裂带北侧,主要分布于崇礼县的红旗营、圆帽山、王帽山、西双台及五道营子一带,总体呈近东西向带状分布,主要岩石类型为(石榴)黑云(角闪)斜长片麻岩、(石榴)斜长角闪岩、(透辉石)大理岩及榴英岩,其中主要岩石(地层)单元为(石榴)黑云(角闪)斜长片麻岩及(石榴)斜长角闪岩,两者多呈互层状产出,局部表现为后者呈透镜体产出于前者中,(透辉石)大理岩及榴英岩呈透镜状、团块状或似层状产出于(石榴)黑云(角闪)斜长片麻岩中。(石榴)黑云(角闪)斜长片麻岩的原岩为沉积岩及火成岩,且以沉积岩为主;(石榴)斜长角闪岩的原岩为基性火山岩;(透辉石)大理岩的原岩可能为形成于被动大陆边缘由浅海沉积环境向陆表海环境过渡环境的海相灰岩,形成环境具有较强的氧化性;榴英岩的原岩可能为沉积岩中的杂砂岩,根据石榴黑云斜长片麻岩与石榴斜长角闪岩中石榴石的成分剖面可知,二者经历了相似的变形特征,因此推测崇礼地区红旗营子群中的石榴黑云斜长片麻岩与石榴斜长角闪岩均为原来的地层,后期一起经历了变形变质作用,因此崇礼红旗营子群应为一套火山—沉积岩系。锆石SHRIMP U-Pb年代学研究表明,冀北崇礼红旗营子群的物质来源较为复杂,其碎屑锆石的年龄值范围介于343.4Ma~2057Ma之间,原岩的沉积年龄不会早于343.4Ma,其沉积—变质年龄介于326Ma~343.4Ma之间,在后期经历了6期次的构造热事件,对应的变质年龄分别为326±Ma、281±Ma、268±Ma、250±Ma、243±Ma及234±Ma。冀北崇礼红旗营子群为一套晚古生代的火山—沉积岩系,后期经历了多期次的构造热事件。其中发生于326±Ma、281±Ma、268±Ma、250±Ma的构造热事件与华北地块北缘早石炭世晚期—中二叠世及二叠纪末—三叠纪岩浆活动具有一定对应关系,因此本文认为冀北崇礼红旗营子群的相关构造热事件可能与古亚洲洋向南俯冲至华北地块、华北地块与西伯利亚南缘蒙古增生褶皱带的拼合造山及岩石圈的拆沉作用有关;古亚洲洋的闭合、华北地块与西伯利亚南缘蒙古增生褶皱带的拼合在二叠纪末—三叠纪初期已完成,因此研究区后期的240±Ma及234±Ma构造热事件可能与太平洋板块相关活动及华北克拉通的板内活动有关。同时,根据研究区所有岩石类型都记录了268±Ma的构造热事件变质年龄,因此推测崇礼地区红旗营子群在268±Ma发生的变质事件的程度最为强烈。
[Abstract]:Located on the north side of Chongli-Chicheng fault zone in northern Hebei Province, the Hongqi Yingzi group is mainly distributed in Hongqi camp, Yuanmaoshan, Wangmaoshan, Xishuangtai and Wudaoyingzi area of Chongli County. The main rock types are (pomegranate) black cloud (hornblende) plagioclase gneiss (pomegranate) amphibolite (diopside) marble and eclogite. The main rock (stratigraphic) units are (pomegranate) black cloud (hornblende) oblique gneiss and (pomegranate) oblique amphibolite, both of which are interbedded and partly appear as lens in the former. (diopside) marble and eclogite are lenticular. The primary rocks of the massive or stratiform gneiss in the (pomegranate) black cloud (hornblende) plagitic gneiss are sedimentary rocks and igneous rocks, and are mainly sedimentary rocks. (pomegranate) the primary rock of amphibolite is basic volcanic rock; (diopside) the original rock of marble may be marine limestone formed in the passive continental margin from shallow sea sedimentary environment to surface sea environment, and the forming environment has strong oxidizing property. The source rocks of eclogite may be complex sandstone in sedimentary rocks. According to the composition profiles of garnet in garnet black cloud plagioclase gneiss and pomegranate amphibolite, they have experienced similar deformation characteristics. Therefore, it is inferred that the pomegranate black cloud plagiocline gneiss and pomegranate amphibolite in Hongyingzi group in Chongli area are original strata, and have undergone deformation and metamorphism together in the late stage. Therefore, the Chongli Hongqi Yingzi group should be a set of volcanic-sedimentary rock series. The zircon SHRIMP U-Pb chronological study shows that the material source of the Chongli Hongqi-Yingzi group in northern Hebei is more complex. The age range of the detrital zircon is between 343.4 Ma and 2057 Ma, and the sedimentary age of the protolith is no earlier than 343.4 Ma. The sedimentation-metamorphic age is between 326 Ma and 343.4 Ma, and it has experienced six tectonic thermal events in the later stage, corresponding to 326 卤Ma-281 卤Ma metamorphic age. 268 卤Ma 250 卤Ma 243 卤Ma and 234 卤Ma.The Chongli Hongqiyingzi group in northern Hebei is a late Paleozoic volcanic-sedimentary rock series. There were many tectonic thermal events in the late stage, of which 326 卤Ma-281 卤Ma-268 卤Ma. The tectonic heat event of 250 卤Ma is related to the late early Carboniferous to the Middle Permian and the late Permian to Triassic magma activity in the northern margin of the North China block. Therefore, this paper suggests that the related tectonic thermal events of the Chongli Hongqiying sub-group in northern Hebei may be related to the subduction of the paleo-Asian ocean to the North China block. The North China block is related to the assemblage orogeny of the Mongolia accretive fold belt in the southern Siberian margin and the desubsidence of the lithosphere. The closure of the Paleo-Asian Ocean and the assemblage of the North China block and the Mongolian accretive fold belt on the southern edge of Siberia were completed at the end of Permian to the early Triassic. Therefore, the tectonic thermal events of 240 卤Ma and 234 卤Ma in the later stage of the study area may be related to the activities related to the Pacific plate and the intraplate activities of the North China Craton. According to all the rock types in the study area, the metamorphic ages of 268 卤Ma tectonic thermal events have been recorded, so it is inferred that the extent of metamorphic events in the Hongyingzi group of Chongli area at 268 卤Ma is the strongest.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P587

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