
第43卷第5期 2016年10月
doi: 10.12029/gc20160502
中
国地
质
GEOLOGY IN CHINA
李报宏,集洪杰,杨永恒,等.云岗盆地晚中生代沉积-火山充填序列及其构造意义[]].中国地质,2016,43(5):1481-1494
Vol.43, No.5 Oct.,2016
Li Zhenhong, Qu Hongjie, Yang Yongheng, et al. Late Mesozoic sedimentary volcanic flling record in Yungang basin and its tectonic implications[J]. Geology in China, 2016, 43(5): 14811494 (in Chinese with English abstract),
云岗盆地晚中生代沉积-火山充填序列
及其构造意义
李振宏渠洪杰杨永恒’公王斌
(1.中国地质科学院地质力学研究所,北京100081;2.中油辽河油分公司,辽宁盘锦124010)
提要:利用凝灰岩夹层及安山的错石U-Pb同位系测年,对云闵盆地晚申生代地层充填序列的关键时限进行了限定。结合地层接触关系、安山岩的地球化学特征,分析了重点地质界面的构造意义。取得了以下主要认识:(1)早中侏罗世,盆地为一套潮进序列的连续沉积,以大同组含煤地层为代表,暗示着区域拉张的构造背景;(2)盆地整体缺失了晚保罗世(160.4±1.1)Ma至早白垩世(130.1±0.7)Ma的沉积地层,其发生的动力学背景可能与古太平洋、西伯利亚、特提斯同时向东亚大陆汇聚产生的远程效应有关;3)旧高山安山岩形成于早白垩世(130.1±0.7)Ma大陆板内裂谷的构造背景,与华北克拉通破坏的动力学背景紧密相关。研究成果对旧高山安山岩时代归届提出了新的认识,并不归属于上保罗统磐馨山组,而相当于下白垩统张家口组。
关键词:云岗盆地;旧高山;晚中生代;凝灰质碳酸盐岩;安山岩;错石U-Pb同位素测年
中图分类号:P534.5;P597
文献标志码:A
文章编号:10003657(2016)05-148114
LateMesozoic sedimentary-volcanic filling record inYungang basin and its
tectonicimplications
LIZhen-hong',QUHong-jie',YANGYong-heng,GONGWang-bin
(1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Bei/ing 100081, China;2. Liaohe Oilfield Company of
Petrochind, Panjin124010, Liaoning, China)
Abstraet: Based on regional stratigraphic correlation and using zircon dating method of tuff layer and andesite rocks in the Late Mesozoic stratigraphic sequence, the authors defined the key time of the sedimentaryfill record. According to the formation contact relationship and the geochemical characteristics of the andesite, the authors also analyzed the tectonic significance of the key geological interface. Some conclusions have been reached: (1) During the EarlyMiddle Jurassic, the sedimentary sequence was characterized by a suite of lake transgression sequence with the coalbearing strata of Datong Formation, indicating the tectonic setting of the regional extension; (2) These strata had no sedimentary record from Late Jurassic (160.4± 1.1 Ma) to Early Cretaceous
收稿日期:20151026;改回日期:20160318
基金项目:国家自然科学基金项目(41372122)及中国地质调查局地质调查项目(1212011121095)联合资助。
作者简介:李报宏,男,1973年生,副研究员,主要从事沉积盆地与动力学研究;E-mail:lizhennhong@126.com:
http:/geochina.cgs.gov.cn 中国地质, 2016, 43(5)