台湾弧前盆地构造反转的数值模拟

张立升; 闫义; 单业华; 陈文煌

doi:10.16028/j.1009-2722.2017.06004

台湾弧前盆地构造反转的数值模拟

1.
中国科学院广州地球化学研究所边缘海地质重点实验室，广州 510640

2.
中国科学院大学，北京 100049

基金项目:
国家自然科学基金“南海扩张过程及海陆变迁：菲律宾巴拉望-泯都洛陆块地层沉积记录”(41476036)

详细信息

作者简介: 张立升(1992-)，男，在读硕士，主要从事数值模拟方面的研究工作. E-mail: arthursheng@163.com

通讯作者: 闫义(1973-)男，研究员，主要从事边缘海构造与盆地演化方面的研究工作. E-mail: yanyi@gig.ac.cn

中图分类号: TE121.2

收稿日期: 2017-02-17

刊出日期: 2017-06-28

NUMERICAL SIMULATION OF THRUST STRUCTURAL INVERSION FOR TAIWAN FORE-ARC BASIN

1.
Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences,Guangzhou 510640, China

2.
University of Chinese Academy of Science, Beijing 100049, China

More Information

Corresponding author: YAN Yi, yanyi@gig.ac.cn

Received Date: 17 February 2017

Publish Date: 28 June 2017

摘要

摘要:
台湾造山带是世界上最年轻的活跃的造山带之一，位于欧亚板块和菲律宾海板块的交界处，具有独特的地质环境。海岸山脉位于台湾岛的最东侧，由残留的弧前盆地和火山岛弧组成，前者为北吕宋海槽弧前盆地经两期强烈的挤压剪切构造演化而来。利用FLAC6.0软件模拟了台湾弧前盆地逆冲构造反转的演化过程。通过模拟结果分析发现，台湾弧前盆地中逆冲构造的反转是由东向西逐渐发育而来，由局部向西倾斜的次级褶皱构造最终演化为整体向西的逆冲构造。地层厚度和岛弧基底的坡角对于褶皱的形成演化方式都起到了明显的控制作用。
- 台湾 /
- 弧前盆地 /
- 逆冲构造 /
- 数值模拟
Abstract:
The Taiwan orogenic belt, located in the juncture of the Eurasian plate and the Philippine Sea plate, is one of the youngest active orogenic belts in the world within a unique geological environment. The Coastal Mountains, which is located in the east of the Island, are composed of a residual fore-arc basin and a volcanic island, and the former of which is evolved from the fore-arc basin of the north Luzon Trough after two-stages of strong extrusion of shearing structure. This paper adopts FLAC6.0 to simulate the thrust structural inversion of the Taiwan fore-arc basin. It is found out through analysis of simulation results that the reversal of thrust structure in the Taiwan fore-arc basin is developed from east to west gradually, and evolves from local tectonic inversion in the beginning to overall thrust structure westward finally. In addition, stratum thickness and slope angle of basement plays certain control roles in the formation and evolution of folding.
- Taiwan /
- fore-arc basin /
- thrust structure /
- numerical simulation

HTML全文

图 1 (A) 台湾海域构造图(据文献[11]改编); (B)海岸山脉地质图(据文献[12]改编); (C) AA’构造剖面图(据文献[9]改编，α：连续单元；β：破坏单元；γ：分割单元；δ：混杂岩)

Figure 1.

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图 2 乐合弧前盆地简易岩性柱状图(据文献[19]改编)

Figure 2.

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图 3 台湾弧前盆地的地震反射剖面(据文献[35]改编)

Figure 3.

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图 4 台湾弧前盆地逆冲构造的模型演化

Figure 4.

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图 5 有限剪切增量变化

Figure 5.

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图 6 不同坡角的模型演化((A)坡角为0°，(B)坡角为3°)

Figure 6.

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图 7 不同坡角的模型演化((A)坡角为5°；(B)坡角为10°；地层岩性同图 5)

Figure 7.

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图 8 台湾弧前盆地的构造演化模型(据文献[12]改编)

Figure 8.

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图 9 北吕宋海槽北部南北向构造剖面(据文献[41]改编)

Figure 9.

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表 1 模型中的岩性分层和岩石力学参数

Table 1. Layers and their assigned mechanical properties of the model

序号	主要岩性	岩石力学参数
序号	主要岩性	密度/(kg/m³)	体积模量/GPa	剪切模量/GPa	黏聚力/mPa	抗拉强度/mPa	内摩擦角/(°)	膨胀角/(°)
1	泥岩	2 560	6	9	3	3.8	23	2
2	砂岩	2 650	8	16	10	4.2	3	2
3	泥岩	2 560	6	9	3	3.8	23	2
4	砾质泥岩	2 580	15	15	1	4	10	2
5	安山岩	2 620	60	35	25	15	45	2

下载: 导出CSV

表 2 模型中滑脱带的岩石力学参数

Table 2. Mechanical properties of the decollement zones in the model

滑脱带	法向刚度Kn/(GPa/m)	切向刚度Ks/(GPa/m)	摩擦角/(°)	黏聚力/mPa	膨胀角/(°)
1	0.05	0.01	6	1	0

下载: 导出CSV

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