南沙中部海域沉积地层特征及其构造成因

吴朝华; 赵美松; 刘海龄

doi:10.3799/dqkx.2011.089

南沙中部海域沉积地层特征及其构造成因

doi: 10.3799/dqkx.2011.089

吴朝华^{1, 2,},
赵美松^{1, 2},
刘海龄^2, ,

1.
中国科学院研究生院, 北京 100049
2.
中国科学院南海海洋研究所边缘海地质重点实验室, 广东广州 510301

基金项目:

国家自然科学基金项目 40976029

国家重点基础研究“973”发展计划 2009CB2194

国家重点基础研究“973”发展计划 2007CB411700

详细信息

作者简介:
吴朝华(1985—), 男, 硕士研究生, 主攻南海区域大地构造及油气地质研究. Email: wu_chao_hua@126.com

通讯作者:
刘海龄, E-mail: liuh82@126.com

中图分类号: P736.1
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- 被引次数: 0
出版历程
- 收稿日期: 2011-04-18
- 刊出日期: 2011-09-15

Characteristics of Sedimentary Strata in Central Nansha Sea Area and Its Tectonic Origin

WU Chao-hua^{1, 2
,},
ZHAO Mei-song^{1, 2},
LIU Hai-ling^{2
, ,}

1.
Graduate University of Chinese Academy of Sciences, Beijing 100049, China
2.
CAS Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Guangzhou 510301, China

摘要

摘要: 为了深入了解南沙中部海域的沉积特征及构造演化过程, 选取了该区具代表性的02N02测线对其进行详细的构造和地层解释.发现研究区南部存在一整套厚度较大的中生代甚至更老的地层, 该地层普遍发生了强烈的褶皱作用, 褶皱翼部存在一系列NE-NEE向断裂, 控制沉积明显, 背斜顶部多被剥蚀, 翼部为充填沉积.新生代地层T_g (中始新世) 到T₄₀ (中中新世) 界面之间, 为裂谷充填和披覆沉积, 层内控制沉积的断裂普遍发育, 而T₄₀界面之上为平整的盖层沉积, 断裂作用极少, 地层厚度变化不大.结合以上特征对比区内与02N02测线相交的87N4测线、临近的90N9等测线, 以及横穿该区的94N2测线, 分析了南沙中部海域中、新生代地层的构造成因, 并进一步探讨了其中、新生代地层的演化过程.
- 南沙中部海域 /
- 构造特征 /
- 构造演化 /
- 沉积学 /
- 披覆沉积 /
- 中-新生代 /
- 海洋地质
Abstract: To further understand the characteristics and tectonic evolution of sedimentary in the central waters of the Nansha, we select typical survey line 02N02 in this area and present detailed interpretation of its structure and stratigraphy.It finds that there is a set of thick Mesozoic or even older strata in the area, especially in the southern area, which generally has strong folding, and there is a series of NE-NEE-trending faults controlling the deposition obviously in the wings of folds.Anticline has been eroded at the top, deposited in the wings.The filling and coating deposition between Cenozoic T_g (the top of Middle Eocene) and T₄₀ (the bottom of Middle Miocene) interface in rift valleys were controlled by faults, and the formation of cap rock above T₄₀ with little change in stratigraphic thickness were less controlled by faults.Combining these features above and comparing the line 87N4 intersecting with line 02N02 and the line 90N9 nearby the line 02N02 to the east, and the line 94N2 crossing this area, we analyze the Mesozoic and Cenozoic tectonic origin of the central Nansha Sea area, and further discuss its evolution.
- central Nansha Sea area /
- structural features /
- tectonic evolution /
- sedimentology /
- filling deposits /
- Meso-Cenozoic /
- marine geology

HTML全文

图 1 研究区区域概况

Fig. 1. Regional map of the research area

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图 2 南沙地块地层沉积序列

Fig. 2. Sedimentary sequences of Nansha block

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图 3 02N02地震测线地质解释

Fig. 3. Sketch geological interpretation for the seismic line 02N02

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图 4 南沙中部海域02N02地震剖面(位置见图 3)

a.炮点5820~6600段; b.8823~9427段

Fig. 4. The central segment of seismic profile line 02N02 in Nansha

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图 5 南沙中部海域02N02测线地震剖面(位置见图 3)

a.炮点10260~11050段; b.炮点11680~12410段; c.炮点13080~13945段

Fig. 5. Seismic profile line 02N02 in the central waters of Nansha

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图 6 构造演化史剖面示意

Fig. 6. Schematic tectonic evolution profile

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