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中国北部古元古代地壳尺度的伸展拆离和硅铝壳内活动带:北东向线性航磁异常的地质构造解释
  • ISSN号:0563-5020
  • 期刊名称:《地质科学》
  • 时间:0
  • 分类:P542[天文地球—构造地质学;天文地球—地质学]
  • 作者机构:[1]中国地震局地质研究所,北京100029, [2]中国石油勘探开发研究院,北京100083
  • 相关基金:国家自然科学基金资助项目(批准号:40472114,49070133)研究成果.致谢 与本文有关的早期研究得到已故马杏垣教授的悉心指导,后续研究还得到德国Mainz大学C.W.Passchier教授、英国Liverpool大学J.Piper博士和津巴布韦大学Paul Dirks博士的积极协作,一并表示感谢.
中文摘要:

早前寒武纪地质构造和分辨率大于120km的长波航磁异常特征表明:塔南-华北-朝鲜北部(狼林地块)具有类似的太古宙结晶基底,它们可能曾经是太古宙统一克拉通的组成部分。20~120km分辨率的中波航磁异常凸现一组北东东-北北东走向、改造太古宙高级变质结晶基底的线性航磁异常,它们分别对应于地壳尺度的长寿断裂。古元古代阶段沿着它们发生了大规模的左行韧性伸展剪切运动,在使塔南、朝鲜北部陆块分别向南西和北东伸展拆离的同时,华北克拉通内部也出现了有限的裂解,并伴随着硅铝壳内活动带的发育。本文将这些古元古代阶段韧性伸展剪切带划分为塔南与华北陆块之间的西部剪切带系统、华北与狼林陆块之间的东部剪切带系统和华北陆块内部的青龙-太行山-中条山等3个独立的剪切带系统。西部韧性剪切系统由阿尔金、大同-环县、以及它们之间的狼山-吉兰泰、雅布赖山等次级剪切带组成,控制古元古代阿拉善群和上集宁群的孔兹岩系为代表的硅铝壳内活动带的沉积-构造演化。东部韧性剪切系统包括沂水和新宾-桦甸等韧性剪切带,相关的古元古代活动带以胶东地区的粉子山群、荆山群和辽吉地区的辽河群为代表。中部韧性剪切带系统以太行山地区阜平群、赞皇群中出现的角闪岩相糜棱片麻岩、眼球状糜棱岩带为代表,发育b-型线理,指示近水平或低角度斜滑性质的左行韧性剪切,相关的古元古代活动带包括双山子-青龙河、五台-滹沱、甘陶河-东焦、吕梁、中条以及济宁等。不同规模的古元古代活动带彼此并不相连,以发育变质沉积-火山岩建造为主体,岩石磁化率明显低于太古宙高级变质结晶基底,与之相关的韧性剪切带则以其透入性矿物线理产生了增强的磁化率各向异性,两者共同构建了地壳尺度北东东-北北东

英文摘要:

Geologic and structural records in Early Precambrian and features of long wave ( 〉 120 km) aeromagnetic anomaly indicated that southern Tarim, Central North China and northern Korean(Rangrim terrain) had similar Archean crystalline basements, and probably had been parts of a united Archean craton in NW-SE stretching. Medium wave(20 - 120 km) aeromagnetic anomaly demonstrated a series of NEE-NNE striking linear aeromagnetic anomalies, which reconstructed the Archean high-graded crystalline basement. Results of geologic and structural investigations showed that they were responding to crust-scale long live faults individually. Along them, large-scale left-lateral transtensional ductile shearing had occurred during Paleoproterozoic period. Series insialic mobile belts formed when the southern Tarim, and the northern Korean continental blocks were detached to SW and NE separately from Central North China block. According to the roles of the ductile transtensional shear zones in the reconstruction process of the Archean craton, we divided them into three independent shear systems as western system between southern Tarim and Central Northern China blocks, eastern system between Central Northern China and Rangrim blocks, and Qinglong-Taihangshan-Zhongtiaoshan system in the inner part of the Central Northern China block. The western system was composed by Ahyn, Datong-Huanxian shear belts and secondary Langshan-Jilantai.and Yabulaishan shear belts between them, controlling the sedimentary and structural evolution of the Paleo-proterozoic Alaxa group and the upper Jining Group characterized as khondalite suites. The eastern system included the Yishui, Xinbing-Huadian and the other ductile shear belts, and the related mobile belts presented as Fenzishan Group and Jinshan Group in Jiaodong region, and the Liaohe Group in Liaoning-Jilin region. The Qinglong-Taihangshan-Zhongtiaoshan system appeared as amphibolite-phased mylonitic gneiss and augen mylonites as a result of reworked Fuping and Zanhuang Archaen gne

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期刊信息
  • 《地质科学》
  • 北大核心期刊(2011版)
  • 主管单位:中国科学院
  • 主办单位:中国科学院地质与地球物理研究所
  • 主编:肖文交
  • 地址:北京9825信箱
  • 邮编:100029
  • 邮箱:dzkx@mail.igcas.ac.cn
  • 电话:010-82998115 82998109
  • 国际标准刊号:ISSN:0563-5020
  • 国内统一刊号:ISSN:11-1937/P
  • 邮发代号:2-392
  • 获奖情况:
  • 中国期刊方阵“双百期刊”,除SCI外被国外的主要期刊检索机构检索
  • 国内外数据库收录:
  • 美国化学文摘(网络版),荷兰地学数据库,荷兰文摘与引文数据库,美国剑桥科学文摘,英国动物学记录,中国中国科技核心期刊,中国北大核心期刊(2004版),中国北大核心期刊(2008版),中国北大核心期刊(2011版),中国北大核心期刊(2014版),中国北大核心期刊(2000版)
  • 被引量:14126