柴达木盆地西部新生界磁组构特征及其构造意义

李丽; 蒋荣宝; 祁万修; 吴益平; 杨屹; 李学智; 陈正乐; 陈宣华; 王小凤; 任小娟

柴达木盆地西部新生界磁组构特征及其构造意义

1.
中国地质科学院地质力学研究所, 北京 100081
2.
新疆地质调查院第一地质调查所, 乌鲁木齐 830011

基金项目:

国家重点基础研究发展计划资助项目 2007CB411305

国家油气专项柴达木盆地油气资源战略调查及评价项目 XQ-2004-01

详细信息

作者简介:
李丽(1982-), 女, 在读硕士, 主要从事构造地质学研究。E-mail:lili805@mails.gucas.ac.cn

中图分类号: P138.4
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- 文章访问数: 218
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- 被引次数: 0
出版历程
- 收稿日期: 2007-10-15
- 刊出日期: 2008-03-01

MAGNETIC FABRICS OF CENOZOIC SEDIMENTARY ROCKS IN THE WESTERN QAIDAM BASIN AND THEIR STRUCTURAL SIGNIFICANCE

1.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
2.
No.1 Geological Survey Office, Xinjiang Institute of Geological Survey, Urumqi 830011, Xinjiang, China

摘要

摘要: 柴达木盆地西部狮子沟一带新生代沉积岩磁组构分析结果显示, 岩石磁组构具有磁面理发育、磁线理不发育、磁化率量值椭球呈压扁状的特点; 磁化率各向异性度P值不大, 反映总体构造变形相对较弱。岩石磁组构反映的应力状态总体为以NE向挤压为主, 与轴向NW的背斜构造发育相一致。该区岩石磁组构大多具有原始沉积磁组构特征, 磁面理产状大体上反映沉积岩层的层理, 同时也记录了受NE向挤压作用的痕迹。根据岩石磁组构与地层层理之间的关系分析, 柴西地区两翼不对称的狮子沟背斜具有断展褶皱性质, 其形成与下部的花土沟逆冲断层向南西方向的仰冲有关。
- 柴达木盆地西部 /
- 新生界 /
- 磁组构 /
- 构造变形
Abstract: Magnetic fabric analysis of Cenozoic sedimentary rocks in the vicinity of Shizigou, western Qaidam basin, shows that the magnetic fabrics are characterized by well-developed magnetic foliation, undeveloped magnetic lineation and a flattened magnetic susceptibility ellipsoid, and the P value symbolizing the degree of magnetic susceptibility anisotropy is low, suggesting that ductile deformation is relatively weak. The stress state reflected by the rock magnetic fabric is mainly manifested by NE compression, which is consistent with the arrangement of the anticlines with axes running NW. The magnetic fabrics in the area mostly have the features of primary sedimentary fabrics, with the magnetic foliations largely reflecting the bedding of sedimentary rocks and also recording the signs of NE compression. According to the relation between the magnetic fabrics of rocks and bedding of strata, the Shizigou anticline with two asymmetric limbs in the western Qaidam basin has the nature of a faultpropagation fold and its formation was due to the southwestward obduction of the Huatugou fault underneath.
- western Qaidam Basin /
- Cenozoic /
- magnetic fabric /
- structural deformation

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图 1 柴达木盆地及周缘造山带区域断裂系统

NQLF-北祁连山山前断裂带; NQLSF-北祁连山南缘断裂带; CQLSF-中祁连山南缘断裂带; NZF-北宗务隆山断裂带; NQF-柴北缘断裂带; LXSF-绿梁山-锡铁山南缘断裂带; NQMF-祁漫塔格北缘断裂带; SQF-柴达木南缘断裂带; NKF-昆北断裂带; CKF-昆中断裂带; KLF-昆仑断裂带; ATF-阿尔金断裂带; WF-温泉断裂带(鄂拉山断裂带); 方框内为研究区

Figure 1. Regional fault sy stem of the Qaidam basin and its peripheral orogenic belts

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图 2 柴西地区构造地质略图

Figure 2. Simplified structural map of the western Qaidam basin

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图 3 磁面理(F)-磁线理(L)图解

Figure 3. Flinn diagram of magnetic foliation (F)and lineation (L)

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图 4 磁化率各向异性P-T图解

Figure 4. P-T diagram of susceptibility anisotropy

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5(a) 最大磁化率轴产状投影图(下半球投影, 图中等值线间隔为10)

5(a). Projection diagram of the maximum magnetic susceptibility (lower hemisphere; the contour interval is 10)

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5(b) 最小磁化率轴产状投影图(下半球投影, 图中等值线间隔为10)

5(b). Projection diagram of the minimum magnetic susceptibility (lower hemisphere; the contour interval is 10)

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5(c) 野外观测层理产状投影图(下半球投影, 图中等值线间隔为10)

5(c). Projection diagram of beddings (lower hemisphere; the contour interval is 10)

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图 6 柴西地区地质剖面(给出磁面理与层理倾角的对比)

(图中箭头示意磁面理倾角; 箭头末端的数字为样品位置号。剖面位置见图 2)

Figure 6. Geological cross section of the western Qaidam basin, showing the comparison of magnetic foliations and bedding dips

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表 1 柴西狮子沟一带新生代岩石磁组构测试结果表

Table 1. Magnetic fabrics of Cenozoic sedimentary rocks in the vicinity of Shizigou western Qaidam basin

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