鄂尔多斯盆地南缘上奥陶统赵老峪组岩石磁学研究

兰书琪; 卫弼天; 幸龙云; 杜楠; 冷先刚; 姜南; 程鑫; 陈庆龙; 王保锋; 许鹏祥; 邓晓红; 张冬孟; 李腾; 刘非凡; 吴汉宁

doi:10.19509/j.cnki.dzkq.tb20220647

鄂尔多斯盆地南缘上奥陶统赵老峪组岩石磁学研究

doi: 10.19509/j.cnki.dzkq.tb20220647

兰书琪^{1a, 1b,},
卫弼天^{1a, 1b},
幸龙云^{1a, 1b},
杜楠^{1a, 1b},
冷先刚²,
姜南^{1a, 1b, 3},
程鑫^{1a, 1b, ,},
陈庆龙^{1a, 1b},
王保锋^{1a, 1b, 4},
许鹏祥^{1a, 1b, 5},
邓晓红^{1a, 1b},
张冬孟^{1a, 1b},
李腾^{1a, 1b},
刘非凡^{1a, 1b},
吴汉宁^{1a, 1b}

1a.
西北大学地质学系, 西安 710069
1b.
西北大学大陆动力学国家重点实验室, 西安 710069
2.
中国石油长庆油田分公司, 西安 710021
3.
延安大学石油学院, 陕西延安 716000
4.
甘肃煤炭地质勘查院, 兰州 730000
5.
甘肃煤田地质研究所, 兰州 730000

基金项目:

国家自然科学基金特提斯地球动力系统重大研究计划重点项目 91855211

国家自然科学基金项目 41774073

国家自然科学基金青年基金项目 41702233

详细信息

作者简介:
兰书琪, E-mail: 1132350245@qq.com

通讯作者:
程鑫, E-mail: chenxin@nwu.edu.cn

中图分类号: P539.3
计量
- 文章访问数: 343
- PDF下载量: 40
- 被引次数: 0
出版历程
- 收稿日期: 2022-11-17
- 录用日期: 2023-02-09
- 修回日期: 2022-12-22

Rock magnetism of the Upper Ordovician Zhaolaoyu Formation of the southern Ordos Basin

LAN Shuqi^{1a, 1b
,},
WEI Bitian^{1a, 1b},
XING Longyun^{1a, 1b},
DU Nan^{1a, 1b},
LENG Xiangang²,
JIANG Nan^{1a, 1b, 3},
CHENG Xin^{1a, 1b
, ,},
CHEN Qinglong^{1a, 1b},
WANG Baofeng^{1a, 1b, 4},
XU Pengxiang^{1a, 1b, 5},
DENG Xiaohong^{1a, 1b},
ZHANG Dongmeng^{1a, 1b},
LI Teng^{1a, 1b},
LIU Feifan^{1a, 1b},
WU Hanning^{1a, 1b}

1a.
Department of Geology, Northwest University, Xi′an 710069, China
1b.
State Loboratory for Continental Dynamics, Northwest University, Xi′an 710069, China
2.
Changqing Oilfield Company, PetroChina, Xi′an 710021, China
3.
College of Petroleum and Environmental Engineering, Yan′an University, Yan′an Shaanxi 716000, China
4.
Gansu Provincial Coal Geological Exploration Institute, Lanzhou 730000, China
5.
Gansu Institute of Coal Geology, Lanzhou 730000, China

More Information

Author Bio:
LAN Shuqi, E-mail: 1132350245@qq.com

Corresponding author: CHENG Xin, E-mail: chenxin@nwu.edu.cn

摘要

摘要:
利用古地磁学手段定量约束华北板块早古生代古地理位置可为原特提斯造山作用及华北板块与冈瓦纳大陆的亲缘性研究提供重要科学依据。但华北板块早古生代以来经历了多期构造运动，其西部鄂尔多斯盆地含丰富油气资源，后期构造运动和油气运移均可能导致其早古生代地层遭受重磁化影响。对鄂尔多斯盆地南缘富平地区上奥陶统赵老峪组灰岩、凝灰岩样品进行了系统岩相学、岩石磁学及逐步退磁研究，包括光学显微镜鉴定实验、扫描电镜(SEM)实验、能谱分析(EDS)实验、饱和等温剩磁(SIRM)实验、三轴等温热退磁实验、磁化率随温度变化(κ-T)实验、磁滞回线实验、一阶反转曲线(FORC)实验、系统热退磁实验以及热-交混合退磁实验，探讨了各类岩石的主要载磁矿物及其是否具备记录原生剩磁信息的潜能。结果表明：灰岩及凝灰岩样品的主要载磁矿物为磁铁矿、磁黄铁矿和(或)胶黄铁矿，部分样品还含少量赤铁矿(含杂质)和针铁矿，矿物颗粒的磁畴类型同时含有SD(单畴)和MD(多畴)两种。结合岩相学及退磁实验结果认为这些主要载磁矿物可能是与后期流体作用(有机质成熟及运移等)有关的次生矿物，其携带的剩磁信号不能直接用于约束板块早古生代古地理位置，或可用于约束鄂尔多斯盆地南缘下古生界油气运移成藏过程。
- 华北板块 /
- 岩石磁学 /
- 上奥陶统 /
- 赵老峪组 /
- 流体作用
Abstract: Objective
Palaeomagnetic methods can be used to quantitatively constrain the Early Palaeozoic palaeo-position of the North China Block (NCB), which provides a crucial scientific basis for researching the evolution of the Proto-Tethyan Orogeny and the affinity of the NCB for Gondwana. However, the NCB has undergone considerable tectonic activity since the Early Palaeozoic, and the Ordos Basin in the western part of the NCB is rich in hydrocarbon resources. Late tectonic activity and the migration of hydrocarbon resources may have caused remagnetization of Early Palaeozoic strata.
Methods
Thus, in this paper, to determine the main magnetic minerals in various rocks and their ability to record the primary remanent magnetization, we carry out a series of detailed petrography, rock magnetism and stepwise demagnetization experiments on the limestone and tuff samples of the Upper Ordovician Zhaolaoyu Formation in the Fuping area of the southern Ordos Basin, including optical microscope identification, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), saturated isothermal remanent magnetization (SIRM) acquisition curve, three-axis isothermal thermal demagnetization test, κ-T curve test, hysteresis loop experiment, first-order reversal curve (FORC), and thermal demagnetization and hybrid (TD+AF) demagnetization.
Results
The results indicate that the main magnetic minerals in the limestone and tuff samples are magnetite, pyrrhotite and/or greigite, and some samples also contain a tiny quantity of haematite with impurities and goethite. Mineral particles possess single domains (SDs) as well as multiple domains (MDs) within their magnetic domains. Combining petrographic and demagnetization data, this paper suggests that the main magnetic minerals in the samples are likely secondary minerals associated with later fluid alteration (maturation and migration of organic matter).
Conclusion
The remanent magnetic signals conveyed by these rocks cannot be directly used to constrain the Early Palaeozoic palaeoposition of the NCB but may be used to constrain hydrocarbon migration and accumulation in the Lower Palaeozoic strata of the southern Ordos Basin.
- North China Block /
- rock magnetism /
- Upper Ordovician /
- Zhaolaoyu Formation /
- fluid alteration
注释:

所有作者声明不存在利益冲突。

HTML全文

图 1 鄂尔多斯盆地及周边构造简图(a) (修改自文献[24])、采样区地质简图(b)、富平地区上奥陶统赵老峪组地层柱状图(c) (修改自文献[25])

Figure 1. Regional geological map of the Ordos Basin and surrounding areas (a), geological map of the sampling area (b), and stratigraphic histogram of the Upper Ordovician Zhaolaoyu Formation in the Fuping region (c)

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图 2 鄂尔多斯盆地南缘富平地区赵老峪组野外照片

a~f, h~i.赵老峪组薄板状灰岩夹火山凝灰岩，其中e, f为剖面上段小型褶皱；g.赵老峪组下伏地层马家沟组厚层灰岩

Figure 2. Field photographs of the Zhaolaoyu Formation, Fuping area, southern margin of the Ordos Basin

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图 3 灰岩(a, b, e, f)和凝灰岩(c, d)代表性样品显微镜下照片(a, c, e为正交偏光; b, d, f为单偏光)

Figure 3. Microscopic photographs of representative limestone (a, b, e, f) and tuff (c, d) samples

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图 4 灰岩(a, b)和凝灰岩(c, d)代表性样品扫描电镜图(实心点1~6为测点号，与能谱分析结果对应)

Figure 4. Scanning electron microscopy images of representative limestone (a, b) and tuff (c, d) samples

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图 5 灰岩(a, b, c)和凝灰岩(d, e, f)代表性样品能谱分析结果(点1~6对应图 4中测点号)

Figure 5. Results of energy dispersive spectroscopy (EDS) analyses of representative limestone (a, b, c) and tuff (d, e, f) samples

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图 6 灰岩(a~i)和凝灰岩(j~o)代表性样品等温剩磁(IRM)获得曲线归一化图(a, d, g, j, m)、IRM线性获得(LAP)曲线(b, e, h, k, n)以及IRM梯度获得(GAP)曲线(c, f, i, l, o)

Figure 6. Normalized isothermal remanent magnetization (IRM) acquisition curves (a, d, g, j, m), LAP curves (b, e, h, k, n) and GAP curves (c, f, i, l, o) for representative limestone (a-i) and tuff (j-o) samples

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图 7 赵老峪组灰岩(a~c)和凝灰岩(d, e)代表性样品三轴等温剩磁热退磁曲线归一化图

Figure 7. Normalized thermal demagnetization curves for three-axis IRMs of representative limestone (a-c) and tuff (d-e) samples from Zhaolaoyu Formation

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图 8 灰岩(a~c)和凝灰岩(d~f)代表性样品磁化率随温度变化(κ-T)曲线归一化图

Figure 8. Normalized susceptibility changes with temperature (κ-T) curves of representative limestone (a-c) and tuff (d-f) samples

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图 9 灰岩(a, b)及凝灰岩(c, d)代表性样品磁滞回线

Figure 9. Magnetic hysteresis loops for representative limestone (a, b) and tuff (c, d) samples

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图 10 赵老峪组灰岩(a, b)和凝灰岩(c, d)代表性样品一阶反转曲线(FORC)图(SF为平滑因子；ρ为混合二阶导数)

Figure 10. First order reversal curves (FORC) for representative limestone (a, b) and tuff (c, d) samples from Zhaolaoyu Formation

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图 11 凝灰岩(a, d)及灰岩(b, c)样品热退磁结果

Figure 11. Thermal demagnetisation results of representative tuff (a, d) and limestone (b, c) samples

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图 12 凝灰岩(a, b)及灰岩(c, d)样品热-交混合退磁结果

Figure 12. Hybrid (TD+AF) demagnetization results of representative tuff (a, b) and limestone (c, d) samples

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