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地质科学  2008, Vol. Issue (3): 445-470    DOI:
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青藏高原东北缘若尔盖盆地晚新近纪沉积的岩石地层学
盛海洋
南京交通职业技术学院, 南京, 211188
Lithostratigaphy of Late Neogene deposits in the Zoig? Basin,northeastern margin of the Qinghai-Tibet plateau
Sheng Haiyang
Nanjing Communications Institute of Technology, Nanjing 211188
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摘要 通过野外地质填图和系统取样,以岩石地层特征为基础,以新构造运动为背景,按照多重地层划分观点,本文首次对若尔盖盆地晚新近纪岩石地层的对比和划分做了深入的研究。对黄河干流、白河支流和黑河支流水系的河道堆积岩石的典型剖面的研究,表明更新-全新世的不同发展阶段具有不同的特征;相同时期不同水系的沉积物也不尽相同,反映出盆地晚新近纪地层的发育过程及空间上的差异。对冰川堆积终碛垄测年等研究反映出末次盛冰期和全新世中几次较强的寒冷事件,并划分出4套冰碛层。综合前人的古脊椎动物化石和14C、TL、OSL和ESR等同位素测年资料,将为进一步提出研究区晚新近纪年代地层的划分奠定基础。
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盛海洋
关键词岩石地层学   河道堆积   冰川堆积   新构造运动   晚新近纪   若尔盖盆地     
Abstract: Based on field geological mapping,route survey and sampling in the Zoigê Basin,northeastern margin of the Qinghai-Tibet plateau,and in the light of the view point of stratigraphic multiple classification,the paper discussed lithostratigraphic features of the Late Neogene(mainly,the Pleistocene and Holocene)in the basin.The geological records and lithofacies of 8 typical sections(including outcrops and drilling wells)were described,and combined with the dating results of 14C,TL,OSL and ESR methods and paleontologic data,the Upper Neogene strata were classified and correlated.The fluvial deposits,occurred in the river valleys of the Yellow,Baihe and Heihe Rivers,had varied features in different stages and reflected some variety of the basin developing,which should be controlled by the neotectonic background.There were four drift beds of mountain glacier in western part of the basin,and named the 4366 Highland moraine(middle Middle Pleistocene),the Gongbalake moraine(late Middle Pleistocene),the Zha’erji moraine(early Late Pleistocene)and the Anna’er moraine(late Late Pleistocene),respectively.The glacial deposits could be found in northeastern and southeastern parts of the basin.In addition,there developed some Late Neogene eolian deposits in the basin.The chronostratigraphy,paleobiostratigraphy and climite-stratigraphy of the Late Neogene deposits in the basin will be further explored in another paper.
Key wordsLithostratigaphy   Fluvial deposits   Glacial deposits   Neotectonics   Late Neogene   The Zoig? Basin   
收稿日期: 2007-08-23;
基金资助:中国地质调查局项目(编号:1212010510304);国家自然科学基金项目(编号:40372084);江苏省高校青蓝工程项目(苏教师2006-21)共同资助
引用本文:   
盛海洋. 2008, 青藏高原东北缘若尔盖盆地晚新近纪沉积的岩石地层学. 地质科学, (3): 445-470.
Sheng Haiyang. Lithostratigaphy of Late Neogene deposits in the Zoig? Basin,northeastern margin of the Qinghai-Tibet plateau[J]. Chinese Journal of Geology, 2008, (3): 445-470.
 
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[1] 盛海洋, 王飞跃. 青藏高原东北缘若尔盖盆地晚新近纪地层的多重划分与对比[J]. 地质科学, 2009, 44(1): 281-313.
[2] 樊春, 王二七, 王刚, 王世锋. 龙门山断裂带北段晚新近纪以来的右行走滑运动及其构造变换研究——以青川断裂为例[J]. 地质科学, 2008, (3): 417-433.
[3] 陈均亮, 吴河勇, 朱德丰, 林春华, 于德顺. 海拉尔盆地构造演化及油气勘探前景[J]. 地质科学, 2007, (1): 147-159.
 
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