Petrological and Geochronological Study of Keluo Complex in Northwestern Lesser Xing'an Range
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摘要: 目前业内学者对于科洛杂岩的认识一致缺乏系统的年代学数据与之相匹配,且关于科洛杂岩原岩的物质组成和形成时代也缺少年代学资料的约束,为查明小兴安岭西北部科洛杂岩的原岩组成和变质期次,利用LA-ICP-MS锆石U-Pb测年方法,在系统分析锆石特征及成因的基础上,对科洛杂岩中3种变质岩(弱片麻状角闪石岩、黑云斜长片麻岩和黑云角闪斜长片麻岩)中不同成因锆石进行年代学研究.岩浆型锆石年龄数据显示,碎屑锆石可分为古-中元古代、晚泥盆世晚期-早石炭世早期和晚石炭世晚期-早二叠世早期3组,3个样品中最年轻的锆石年龄分别为286.3±3.6 Ma、284.3±3.1 Ma和345.3±4.8 Ma,而变质锆石年龄数据分为早-中三叠世(峰值年龄248.5 Ma)和早-中侏罗世(峰值年龄173.1 Ma)两期.结合区域资料和年龄数据分析,科洛杂岩中包含下二叠统和下石炭统碎屑沉积岩,物源可能分别来自于区域上的前寒武纪基底残块和石炭统-二叠统岩浆岩,且在成岩之后至少经历了两期变质作用,早期的变质作用可能是蒙古-鄂霍茨克板块南向俯冲作用的远程效应;晚期变质作用受蒙古-鄂霍茨克洋南向俯冲和古太平洋西向俯冲的叠加作用控制.Abstract: Due to the lack of chronological data to constrain the material composition and protolithic age of the Keluo complex, and the lack of chronological date matching the knowledge of the industry scholars, in this study, based on the systematic analysis of different genesis zircon characteristics, genesis and isotopic chronologic results of metamorphic rocks from Keluo complex in northwestern Lesser Xing'an Range, the protolith and metamorphic period of Keluo complex was studied. The LA-ICP-MS magmatic zircon U-Pb ages of three metamorphic rocks (including weak gneissic amphibolite, biotite plagioclase gneiss and biotite amphibole plagioclase gneiss) show that the youngest clastic zircons ages are 286.3±3.6 Ma, 284.3±3.1 Ma and 345.3±4.8 Ma, respectively, which means they formed in Early Permian and Early Carboniferous instead of the Precambrian. Age data also show that the source of clastic sedimentary rocks in Keluo complex is regional basement debris with widely developed two-stage magmatic rocks. Meanwhile, the LA-ICP-MS U-Pb ages of metamorphic zircons indicate that the protolith of Keluo complex underwent at least two-stage metamorphism after diagenesis, the Early-Middle Triassic(peak age 248.5 Ma) and the Early-Middle Jurassic (peak age 173.1 Ma) respectively. The early metamorphism may be a long-range effect of the southward subduction of the Mongolia-Okhotsk plate, while the late metamorphism was controlled by the superposition of the southward subduction of the Mongolia-Okhotsk Ocean and the westward subduction of the paleo-Pacific Ocean.
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Key words:
- Lesser Xing'an Range /
- Keluo complex /
- chronology /
- metamorphism /
- petrology
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图 1 研究区地质简图及采样点位置
图a据Ge et al.(2007)修编
Fig. 1. Simplified geological map of the study area, showing the sample locations
图 6 锆石测年结果分布直方对比(a~c)和概率对比图(d~e)
a.小兴安岭西北部变质岩系变质锆石年龄分布直方图;b.大兴安岭中北段部分原岩锆石年龄分布直方图(佘宏全等,2012);c.大兴安岭中北段部分河流碎屑锆石年龄分布直方图(李明,2010);d.中国东北地区部分显生宙花岗岩年龄分布概率图(引自Wu et al., 2011; Liu et al., 2017);e.小兴安岭西北部变质岩系变质锆石年龄分布概率图
Fig. 6. Comparison for the zircon ages(a-c) and probability plots(d-e)
图 7 蒙古-鄂霍茨克造山带南侧三叠纪岩浆岩已测年龄数据分布
改自Zhao et al., 2017, 年龄数据见表 2
Fig. 7. Complied geochronological data of Triassic granitoids on southern margin of the Mongol-Okhotsk belt
表 1 区域变质岩年代学数据表
Table 1. Geochronological data of regional metamorphic rocks
群/组 样号 岩性 结晶年龄 沉积时代 推测原岩 来源 科洛杂岩 2002NJ-7 黑云斜长片麻岩 333±7 Ma 正片麻岩 ① 科洛杂岩 NH13001 弱片麻状细粒角闪岩 <286.3±3.6 Ma 副变质岩 ④ 科洛杂岩 NH14004 黑云斜长片麻岩 <284.3±3.1 Ma 副片麻岩 ④ 科洛杂岩 NH14010 黑云角闪斜长片麻岩 <345.3±4.8 Ma 副片麻岩 ④ 科洛杂岩 D0014 黑云斜长片麻岩 疑似297±4 Ma ⑤ 落马湖群 HX-161 黑云角闪斜长片麻岩 ~180 Ma 正片麻岩 ② 新开岭群 2002NJ-2 构造片岩 292±6 Ma 中酸性火山岩 ① 新开岭群 HX-120 含石榴石二云片麻岩 <200±2 Ma 副片麻岩 ② 风水沟群 HX-31 角闪片麻岩 <230 Ma 副片麻岩 ② 风水沟群 HX-14 角闪岩 309±3 Ma 玄武-安山质火山岩 ② 风水沟群 HSW6-1 黑云变粒岩 185~255 Ma 副片麻岩 ③ 风水沟群 11HSW4-2 黑云变粒岩 副片麻岩 ③ 注:①苗来成等(2003);② Miao et al.(2015) ;③Xu et al.(2012) ;④本文;⑤杨文鹏等(2018).表 2 蒙古-鄂霍茨克造山带南侧三叠纪岩浆岩年龄数据
Table 2. Complied geochronological data of Triassic granitoids on southern margin of the Mongol-Okhotsk belt
序号 岩石类型 位置 年龄(Ma) 方法 来源 1 正长花岗岩 查哈彦 236±1 LA-ICP-MS 隋振民等,2009 2 花岗岩 Tumurtin Ovoo 241±3 LA-ICP-MS 江思宏等, 2010 3 斑状花岗岩 多宝山 230~240 LA-ICP-MS Hao et al., 2015 4 花岗岩类 风水山 244~200 LA-ICP-MS 佘宏全等,2011 5 花岗岩类 黑河 253~250 LA-ICP-MS Sun et al., 2013 6 花岗岩类 恩和-莫尔道嘎 247~242 LA-ICP-MS Tang et al., 2014 7 花岗岩类 犀牛尔和-奇卡 246~255 LA-ICP-MS Tang et al., 2016 8 花岗岩类 八大关 228 LA-ICP-MS Tang et al., 2016 9 二长花岗岩 莫尔道嘎 259±8 LA-ICP-MS 佘宏全等,2012 10 二长花岗岩 阿日哈沙特-巴阳山 257~251 LA-ICP-MS Gou et al., 2013 11 花岗质片麻岩 莫尔道嘎 244±2 LA-ICP-MS 佘宏全等,2012 12 长英质脉 管护站 249±4 LA-ICP-MS Wu et al., 2011 13 花岗闪长岩 恩和 241~229 LA-ICP-MS 王伟等, 2012 14 英云闪长岩 多宝山 231±3 LA-ICP-MS Zeng et al., 2014 15 石英闪长岩 八道卡 254±4 LA-ICP-MS 张炯飞等, 2003 16 闪长岩-辉长岩 满归-奇乾 227±6 LA-ICP-MS Tang et al., 2016 -
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dqkx-44-10-3265-TableS1-2.pdf