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中亚造山带北山南部下泥盆统火山—沉积地层的岩相、时代及古地理意义
投稿时间:2019-12-20  修订日期:2019-12-31  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020047
摘要点击次数: 31
全文下载次数: 34
作者单位E-mail
牛亚卓 中国地质调查局西安地质调查中心西北地质科技创新中心 nyazhuo@cgs.cn 
宋博 中国地质调查局西安地质调查中心西北地质科技创新中心  
周俊林 中国地质调查局西安地质调查中心西北地质科技创新中心  
许伟 中国地质调查局西安地质调查中心西北地质科技创新中心  
史冀忠 中国地质调查局西安地质调查中心西北地质科技创新中心  
张宇轩 中国地质调查局西安地质调查中心西北地质科技创新中心  
卢进才 中国地质调查局西安地质调查中心西北地质科技创新中心  
基金项目:国家自然科学基金项目(编号41402097和41402195)和中国地质调查局矿产资源调查评价专项(编号DD20190103和DD20160172)
中文摘要:中亚造山带北山南部的火山—沉积地层对探讨古地理演化有重要意义。本文通过北山南部双鹰山地块5条剖面实测,将该区火山—沉积地层分为4种相组合19种岩相,并通过LA-ICP-MS锆石U-Pb测年获得酸性火山岩夹层年龄(418.9 ± 1.2 Ma、417.8 ± 1.2 Ma、417.5 ± 1.4 Ma),证明各剖面均形成于早泥盆世洛赫科夫期(Lochkovian)。双鹰山地块南缘的下泥盆统由共生火山岩相(coherent facies)和原生火山岩相组合(primary volcanic facies)构成,是熔岩溢流、爆发坠落、火山碎屑流和岩浆侵出的产物,代表陆上隆升的普林尼型(Plinian)古火山作用。双鹰山地块中部墩墩山盆地充填序列自下而上由原生火山岩相组合、含火山碎屑沉积相组合(volcanogenic sedimentary facies)和正常沉积的河流相组合构成,代表火山活动逐步减弱和水体深度逐步加深的沉积过程。墩墩山盆地火山—沉积层序指示伸展构造背景,与同造山期磨拉石建造有显著区别。
中文关键词:北山南部  早泥盆世  火山—沉积地层  岩相  LA-ICP-MS锆石U-Pb年龄
 
Lithofacies and age of volcano-sedimentary sequence in the southern Beishan Region, Central Asian Orogenic Belt and its paleogeographical implication
Author NameAffiliationE-mail
NIU Yazhuo Xi’an Center of Geological Survey (Northwest China Center of Geoscience Innovation), China Geological Survey nyazhuo@cgs.cn 
SONG Bo Xi’an Center of Geological Survey (Northwest China Center of Geoscience Innovation), China Geological Survey  
ZHOU Junlin Xi’an Center of Geological Survey (Northwest China Center of Geoscience Innovation), China Geological Survey  
XU Wei Xi’an Center of Geological Survey (Northwest China Center of Geoscience Innovation), China Geological Survey  
SHI Jizhong Xi’an Center of Geological Survey (Northwest China Center of Geoscience Innovation), China Geological Survey  
ZHANG Yuxuan Xi’an Center of Geological Survey (Northwest China Center of Geoscience Innovation), China Geological Survey  
LU Jincai Xi’an Center of Geological Survey (Northwest China Center of Geoscience Innovation), China Geological Survey  
Abstract:Volcano-sedimentary sequences play an important role in paleogeographical reconstruction of the southern Beishan Region, Central Asian Orogenic Belt. These volcano-sedimentary sequences can be subdivided into 19 lithofacies of four associations based on measured sections in the Shuangyingshan Block (SYSB), southern Beishan Region. Three LA-ICP-MS zircon U-Pb ages were reported from the felsic volcanic intercalations (418.9 ± 1.2 Ma, 417.8 ± 1.2 Ma, and 417.5 ± 1.4 Ma), which indicates an age range of the Lochkovian, Early Devonian for these sections. Coherent and primary volcanic facies distributed on the southern margin of SYSB were interpreted as sediments in lava flows, pyroclastic fall, subaerial pyroclastic flows, and resurgent doming. These facies indicate a subaerial Plinian type volcano. Sequences measured in the Dundunshan Basin, northern SYSB are composed of, in an ascending order, primary volcanic, volcanogenic sedimentary, and fluvial facies, which supports a deepening-upward trend with waning volcanism. These sequences propose that the Dundunshan basin was developed in tectonic extension rather than syn-collision compression.
keywords:southern Beishan Region  Early Devonian  volcano-sedimentary sequence  lithofacies  LA-ICP-MS zircon U-Pb age
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