秦岭沙沟街韧性剪切带的岩石磁学、磁组构和运动学涡度分析

李阳, 梁文天, 靳春胜, 董云鹏, 袁洪林, 张国伟. 2017. 秦岭沙沟街韧性剪切带的岩石磁学、磁组构和运动学涡度分析. 岩石学报, 33(6): 1919-1933.
引用本文: 李阳, 梁文天, 靳春胜, 董云鹏, 袁洪林, 张国伟. 2017. 秦岭沙沟街韧性剪切带的岩石磁学、磁组构和运动学涡度分析. 岩石学报, 33(6): 1919-1933.
LI Yang, LIANG WenTian, JIN ChunSheng, DONG YunPeng, YUAN HongLin, ZHANG GuoWei. 2017. Rock-magnetism, magnetic fabric and kinematic vorticity analysis of the Shagoujie shear zone, Qinling orogen. Acta Petrologica Sinica, 33(6): 1919-1933.
Citation: LI Yang, LIANG WenTian, JIN ChunSheng, DONG YunPeng, YUAN HongLin, ZHANG GuoWei. 2017. Rock-magnetism, magnetic fabric and kinematic vorticity analysis of the Shagoujie shear zone, Qinling orogen. Acta Petrologica Sinica, 33(6): 1919-1933.

秦岭沙沟街韧性剪切带的岩石磁学、磁组构和运动学涡度分析

  • 基金项目:

    本文受国家自然科学基金创新群体项目(41421002)、面上基金项目( 41672200)和西北大学大陆动力学国家重点实验室科技部专项经费(201210133、207010009)联合资助

详细信息
    作者简介:

    李阳,男,1987年生,博士生,构造地质学专业,E-mail:liyangxbdx@163.com

    通讯作者: 梁文天,男,1981年生,副教授,主要从事区域构造与造山带研究,E-mail:wtliang@nwu.edu.cn
  • 中图分类号: P545

Rock-magnetism, magnetic fabric and kinematic vorticity analysis of the Shagoujie shear zone, Qinling orogen

More Information
  • 秦岭商丹构造带内发育的晚三叠世沙沟街韧性剪切带蕴含大量地质信息,很好地记录了秦岭印支期碰撞造山过程。为了探究该剪切带的运动学特征及其动力学背景,在野外观测、显微构造分析的基础上,对其中发育的糜棱岩进行了磁组构和运动学涡度研究。岩石磁学和磁组构分析结果显示:样品的平均磁化率Km值总体较高,载磁矿物主要为磁铁矿等铁磁性矿物;磁化率各向异性度PJ值较大,表明构造变形较为强烈;形态参数T值多大于0,反映磁化率椭球体以扁球体为主;磁线、面理优势产状与野外观测到的矿物线、面理较为一致。结合磁组构、边界断层以及C面理产状,认为沙沟街韧性剪切带具有左行走滑挤压的运动学特征。运动学涡度Wk值及其分布特征表明,沙沟街剪切带中纯剪切作用所占的比重总体大于简单剪切作用,并且剪切带的核部应位于北界断层附近。综合分析认为,沙沟街韧性剪切带的运动学特征反映了总体斜向汇聚背景下的局部走滑挤压,与商丹带西段发育的同期韧性剪切带具有完全反向的运动学指向,这可能与碰撞导致的侧向挤出构造有关。

  • 加载中
  • 图 1 

    研究区域地质简图

    Figure 1. 

    Geological sketch map of the Shagoujie area

    图 2 

    沙沟街韧性剪切带露头与显微照片

    Figure 2. 

    Field photographs and photomicrographs of the Shagoujie ductile shear zone

    图 3 

    沙沟街剪切带平均磁化率直方图(a)及磁化率值分布曲线(b)

    Figure 3. 

    Histogram of mean susceptibility (a) and its distribution curve (b) of the Shagoujie shear zone

    图 4 

    沙沟街剪切带代表性样品的磁滞回线

    Figure 4. 

    Hysteresis loops of representative samples of the Shagoujie shear zone

    图 5 

    沙沟街剪切带磁滞参数的Day图

    Figure 5. 

    Hysteresis ratios on Day plot of the Shagoujie shear zone

    图 6 

    沙沟街剪切带代表性样品的IRM曲线和反向场退磁曲线

    Figure 6. 

    IRM acquisition curves and back-field demagnetization curves of SIRM for representative sample

    图 7 

    沙沟街剪切带代表性样品的热磁曲线特征(黑色为升温曲线,灰色为降温曲线)

    Figure 7. 

    Temperature dependence of magnetic susceptibility (dark line show heating, whereas grey lines show cooling)

    图 8 

    PJT值分布直方图

    Figure 8. 

    Histograms of PJ and T

    图 9 

    磁组构对数弗林图解

    Figure 9. 

    Flinn-type plot of lnF vs. lnL

    图 10 

    Km-PJKm-TPJ-T图解

    Figure 10. 

    Diagram of Km vs. PJ, Km vs. T and PJ vs. T

    图 11 

    沙沟街韧性剪切带磁组构分布特征

    Figure 11. 

    Magnetic fabric patterns of the Shagou ductile shear zone

    图 12 

    沙沟街剪切带运动学涡度值分布特征

    Figure 12. 

    Kinematic vorticity patterns of the Shagoujie ductile shear zone

    图 13 

    横过剪切带的变形分解图(据Lin et al., 2007)

    Figure 13. 

    Diagram showing the localization and partitioning of deformation across shear zone (after Lin et al., 2007)

    图 14 

    沙沟街韧性剪切带形成的动力学背景模式图

    Figure 14. 

    Geodynamic model for the formation of the Shagoujie ductile shear zone

    表 1 

    磁组构参数表

    Table 1. 

    Magnetic data for the individual samples

    下载: 导出CSV

    表 2 

    沙沟街韧性剪切带Wk值计算结果

    Table 2. 

    Kinematic vorticity of the Shagoujie ductile shear zone

    下载: 导出CSV
  •  

    Alsop GI and Holdsworth RE. 2004. Shear zones-an introduction and overview. In: Alsop GI, Holdsworth RE, McCaffrey KJW and Hand M (eds.). Flow Processes in Faults and Shear Zones. Geological Society, London, Special Publication, 224: 1-9

     

    Borradaile GJ and Henry B. 1997. Tectonic applications of magnetic susceptibility and its anisotropy. Earth-Science Reviews, 42(1-2): 49-93 doi: 10.1016/S0012-8252(96)00044-X

     

    Borradaile GJ and Jackson M. 2004. Anisotropy of magnetic susceptibility (AMS): Magnetic petrofabrics of deformed rocks. In: Martin-Hernandez F (ed.). Magnetic Fabric: Methods and Applications. Geological Society, London, Special Publications, 238(1): 299-360 doi: 10.1144/GSL.SP.2004.238.01.18

     

    Borradaile GJ and Jackson M. 2010. Structural geology, petrofabrics and magnetic fabrics (AMS, AARM, AIRM). Journal of Structural Geology, 32(10): 1519-1551 doi: 10.1016/j.jsg.2009.09.006

     

    Bouchez JL, Hutton DHW and Stephens WE. 1997. Granite: From Segregation of Melt to Emplacement Fabrics. Dordrecht: Kluwer Academic Publishers, 1-358

     

    Bruhn D and Burlini L. 2005. High Strain Zones: Structure and Physical Properties. Geological Society, London, Special Publications, 245: 1-452 doi: 10.1144/GSL.SP.2005.245

     

    Chen XY, Liu JL, Weng ST, Kong YL, Wu WB, Zhang LS and Li HY. 2016. Structural geometry and kinematics of the Ailao Shan shear zone: Insights from integrated structural, microstructural, and fabric studies of the Yao Shan complex, Yunnan, Southwest China. International Geology Review, 58(7): 849-873 doi: 10.1080/00206814.2015.1136572

     

    Day R, Fuller M and Schmidt VA. 1977. Hysteresis properties of titanomagnetites: Grain-size and compositional dependence. Physics of the Earth and Planetary Interiors, 13(4): 260-267 doi: 10.1016/0031-9201(77)90108-X

     

    De Saint-Blanquat M and Tikoff B. 1997. Development of magmatic to solid-state fabrics during syntectonic emplacement of the Mono Creek granite, Sierra Nevada Batholith. In: Bouchez JL, Hutton DHW and Stephens WE (eds.). Granite: From Segregation of Melt to Emplacement Fabrics. Dordrecht: Kluwer Academic Publishers, 129-144

     

    Dong YP, Zhang GW, Neubauer F, Liu XM, Genser J and Hauzenberger C. 2011. Tectonic evolution of the Qinling orogen, China: Review and synthesis. Journal of Asian Earth Sciences, 41(3): 213-237 doi: 10.1016/j.jseaes.2011.03.002

     

    Dunlop DJ. 2002. Theory and application of the Day plot (Mrs/Ms versus Hcr/Hc) 1. Theoretical curves and tests using titanomagnetite data. Journal of Geophysical Research, 107(B3): EPM 4-1-EPM 4-22

     

    Ferré EC, Gébelin A, Till JL, Sassier C and Burmeister KC. 2014. Deformation and magnetic fabrics in ductile shear zones: A review. Tectonophysics, 629: 179-188 doi: 10.1016/j.tecto.2014.04.008

     

    Grégoire V, de Saint Blanquat M, Nédélec A and Bouchez JL. 1995. Shape anisotropy versus magnetic interactions of magnetite grains: Experiments and application to AMS in granitic rocks. Geophysical Research Letters, 22(20): 2765-2768 doi: 10.1029/95GL02797

     

    Hrouda F. 1982. Magnetic anisotropy of rocks and its application in geology and geophysics. Geophysical Surveys, 5(1): 37-82 doi: 10.1007/BF01450244

     

    Ishihara S. 1979. Lateral variation of magnetic susceptibility of the Japanese granitoids. The Journal of the Geological Society of Japan, 85(8): 509-523 doi: 10.5575/geosoc.85.509

     

    Johnson SE, Lenferink HJ, Price NA, Marsh JH, Koons PO, West Jr DP and Beane R. 2009. Clast-based kinematic vorticity gauges: The effects of slip at matrix/clast interfaces. Journal of Structural Geology, 31(11): 1322-1339 doi: 10.1016/j.jsg.2009.07.008

     

    Law RD, Searle MP and Simpson RL. 2004. Strain, deformation temperatures and vorticity of flow at the top of the Greater Himalayan Slab, Everest Massif, Tibet. Journal of the Geological Society, 161(2): 305-320 doi: 10.1144/0016-764903-047

     

    Li WY. 2008. Geochronology and geochemistry of the ophiolites and island-arc-type igneous rocks in the Western Qinling Orogen and the Eastern Kunlun Orogen: Implication for the evolution of the Tethyan Ocean. Ph. D. Dissertation. Hefei: University of Science and Technology of China (in Chinese with English summary)

     

    Li Y. 2014. Emplacement mechanism and its tectonic implications of Baliping pluton, East Qinling orogen, China. Master Degree Thesis. Xi'an: Northwest University (in Chinese with English summary)

     

    Liang WT, Zhang GW, Lu RK, Pei XZ, Jin CS and Wang JQ. 2009. Magnetic fabric study and its tectonic significance of suture zones in joint area of Qinling and Qilianshan. Chinese Journal of Geophysics, 52(1): 140-149 (in Chinese with English abstract) http://en.cnki.com.cn/Article_en/CJFDTOTAL-DQWX200901018.htm

     

    Liang WT, Zhang GW, Lu RK and Nantasin P. 2013. Extrusion tectonics inferred from fabric study of the Guanzizhen ophiolitic mélange belt in the West Qinling orogen, Central China. Journal of Asian Earth Sciences, 78: 345-357 doi: 10.1016/j.jseaes.2013.07.006

     

    Liang WT, Zhang GW, Bai Y, Jin CS and Nantasin P. 2015. New insights into the emplacement mechanism of the Late Triassic granite plutons in the Qinling orogen: A structural study of the Mishuling pluton. The Geological Society of America Bulletin, 127(11-12): 1583-1603 doi: 10.1130/B31187.1

     

    Liang WT, Jin CS, Nantasin P and Zhang GW. 2015. Magnetic mineralogy and the reliability of AMS in the Late Triassic Mishuling pluton, Qinling orogen. Chinese Journal of Geophysics, 58(3): 953-970 (in Chinese with English abstract) http://en.cnki.com.cn/Article_en/CJFDTOTAL-DQWX201503021.htm

     

    Lin SF, Jiang DZ and Williams PF. 2007. Importance of differentiating ductile slickenside striations from stretching lineations and variation of shear direction across a high-strain zone. Journal of Structural Geology, 29(5): 850-862 doi: 10.1016/j.jsg.2006.12.006

     

    Meng QR and Zhang GW. 1999. Timing of collision of the North and South China blocks: Controversy and reconciliation. Geology, 27(2): 123-126 doi: 10.1130/0091-7613(1999)027<0123:TOCOTN>2.3.CO;2

     

    Passchier CW. 1986. Flow in natural shear zones: The consequences of spinning flow regimes. Earth and Planetary Science Letters, 77(1): 70-80 doi: 10.1016/0012-821X(86)90133-0

     

    Passchier CW and Trouw RAJ. 2005. Microtectonics. 2nd Edition. Berlin Heidelberg: Springer, 1-306

     

    Ramsay JG and Huber MI. 1983. The Techniques of Modern Structural Geology, Volume 1: Strain Analysis. London: Academic Press, 1-307

     

    Reischmann T, Altenberger U, Kröner A, Zhang G, Sun Y and Yu Z. 1990. Mechanism and time of deformation and metamorphism of mylonitic orthogneisses from the Shagou Shear Zone, Qinling Belt, China. Tectonophysics, 185(1-2): 91-109 doi: 10.1016/0040-1951(90)90407-Y

     

    Rochette P, Jackson M and Aubourg C. 1992. Rock magnetism and the interpretation of anisotropy of magnetic susceptibility. Reviews of Geophysics, 30(3): 209-226 doi: 10.1029/92RG00733

     

    Sidman D, Ferré EC, Teyssier C and Jackson M. 2005. Magnetic fabric and microstructure of a mylonite: Example from the Bitterroot shear zone, western Montana. In: Bruhn D and Burlini L (eds.). High-Strain Zones: Structure and Physical Properties. Geological Society, London, Special Publications, 245: 143-163

     

    Stevenson CTE, Owens WH and Hutton DHW. 2007. Flow lobes in granite: The determination of magma flow direction in the Trawenagh Bay granite, northwestern Ireland, using anisotropy of magnetic susceptibility. The Geological Society of America Bulletin, 119(11-12): 1368-1386 doi: 10.1130/B25970.1

     

    Takeshita T. 1996. Estimate of the physical conditions for deformation based on c-axis fabric transitions in naturally deformed quartzite. The Journal of the Geological Society of Japan, 102(3): 211-222 doi: 10.5575/geosoc.102.211

     

    Tarling DH and Hrouda F. 1993. The Magnetic Anisotropy of Rocks. London: Chapman & Hall

     

    Tikoff B and Fossen H. 1995. The limitations of three-dimensional kinematic vorticity analysis. Journal of Structural Geology, 17(12): 1771-1784 doi: 10.1016/0191-8141(95)00069-P

     

    Vernon RH. 2004. A Practical Guide to Rock Microstructure. Cambridge: Cambridge University Press, 295-474

     

    Wang XS, Zheng YD and Wang T. 2007. Strain and shear types of the Louzidian ductile shear zone in southern Chifeng, Inner Mongolia, China. Science in China (Series D), 50(4): 487-495 doi: 10.1007/s11430-007-2054-9

     

    Weijermars R. 1991. The role of stress in ductile deformation. Journal of Structural Geology, 13(9): 1061-1078 doi: 10.1016/0191-8141(91)90057-P

     

    Weinberg RF, Sial AN and Mariano G. 2004. Close spatial relationship between plutons and shear zones. Geology, 32(5): 377-380 doi: 10.1130/G20290.1

     

    Xu ZQ, Zhang JX, Xu HF, Wang ZX, Li HB, Yang TN, Qiu XP, Zeng LS, Shen K and Chen W. 1997. Ductile Shear Zones in the Main Continental Mountain Chains of China and their Dynamics. Beijing: Geological Publishing House, 158-161 (in Chinese)

     

    Xypolias P. 2010. Vorticity analysis in shear zones: A review of methods and applications. Journal of Structural Geology, 32(12): 2072-2092 doi: 10.1016/j.jsg.2010.08.009

     

    Yu ZP, Sun Y and Altenberger U. 1996. Deformation and metamorphism of granitic mylonite in the Shagou ductile shear zone, Qinling, Central China. Journal of Northwest University (Natural Science Edition), 26(4): 331-334 (in Chinese with English abstract)

     

    Zhang B, Zhang JJ, Zhong DL and Guo L. 2009. Strain and kinematic vorticity analysis: An indicator for sinistral transpressional strain-partitioning along the Lancangjiang shear zone, western Yunnan, China. Science in China (Series D), 52(5): 602-618 doi: 10.1007/s11430-009-0065-4

     

    Zhang CL, Wang T and Wang XX. 2008. Origin and tectonic setting of the Early Mesozoic Granitoids in Qinling Orogenic belt. Geological Journal of China Universities, 14(3): 304-316 (in Chinese with English abstract) http://en.cnki.com.cn/Article_en/CJFDTOTAL-GXDX200803006.htm

     

    Zhang GW, Zhang BR, Yuan XC and Xiao QH. 2001. Qinling Orogenic Belt and Continental Dynamics. Beijing: Science Press, 117-321 (in Chinese)

     

    Zhang JJ and Zheng YD. 1997. Basic principles and applications of kinematic vorticity and polar Mohr diagram. Geological Science and Technology Information, 16(3): 33-39 (in Chinese with English abstract)

     

    Zheng YD. 1999. Kinematic vorticity number and shear type related to the Yagan metamorphic core complex on Sino-Mongolian border. Scientia Geologica Sinica, 34(3): 273-280 (in Chinese with English abstract) http://en.cnki.com.cn/Article_en/CJFDTotal-DZKX199903002.htm

     

    Zhou JX and Zhang GW. 1996. Microstructures and Re-recognization of (p)-T-t path in the Shagou mylonite zone of the Shangdan Zone, Qinling Belt, China. Scientia Geologica Sinica, 31(1): 33-42 (in Chinese with English abstract)

     

    Zhou Y, Zhou P, Wu SM, Shi XB and Zhang JJ. 2002. Magnetic fabric study across the Ailao Shan-Red River shear zone. Tectonophysics, 346(3-4): 137-150 doi: 10.1016/S0040-1951(01)00269-4

     

    李王晔. 2008. 西秦岭-东昆仑造山带蛇绿岩及岛弧型岩浆岩的年代学和地球化学研究——对特提斯洋演化的制约. 博士学位论文. 合肥: 中国科学技术大学

     

    李阳. 2014. 东秦岭八里坪岩体侵位机制的构造约束及意义. 硕士学位论文. 西安: 西北大学

     

    梁文天, 张国伟, 鲁如魁, 裴先治, 靳春胜, 王建其. 2009. 秦祁接合带造山缝合带磁组构特征及其构造意义. 地球物理学报, 52(1): 140-149 http://www.cnki.com.cn/Article/CJFDTOTAL-DQWX200901018.htm

     

    梁文天, 靳春胜, Nantasin P, 张国伟. 2015. 秦岭造山带晚三叠世糜署岭岩体的岩石磁学及磁组构可靠性约束. 地球物理学报, 58(3): 953-970 doi: 10.6038/cjg20150321

     

    王新社, 郑亚东, 王涛. 2007. 内蒙赤峰南部楼子店韧性剪切带应变与剪切作用类型. 中国科学(D辑), 37(2): 160-166 http://www.cnki.com.cn/Article/CJFDTOTAL-JDXK200702002.htm

     

    许志琴, 张建新, 徐惠芬, 王宗秀, 李海兵, 杨天南, 邱小平, 曾令森, 沈昆, 陈文. 1997. 中国主要大陆山链韧性剪切带及动力学. 北京: 地质出版社, 158-161

     

    于在平, 孙勇, Altenberger U. 1996. 秦岭沙沟韧性剪切带长英质糜棱岩的变形变质作用. 西北大学学报(自然科学版), 26(4): 331-334 http://www.cnki.com.cn/Article/CJFDTOTAL-XBDZ604.016.htm

     

    张波, 张进江, 钟大赉, 郭磊. 2008. 滇西澜沧江左旋走滑挤压带应变分解的应变和运动学涡度证据. 中国科学(D辑), 38(10): 1268-1283 doi: 10.3321/j.issn:1006-9267.2008.10.010

     

    张成立, 王涛, 王晓霞. 2008. 秦岭造山带早中生代花岗岩成因及其构造环境. 高校地质学报, 14(3): 304-316 http://www.cnki.com.cn/Article/CJFDTOTAL-GXDX200803006.htm

     

    张国伟, 张本仁, 袁学诚, 肖庆辉. 2001. 秦岭造山带与大陆动力学. 北京: 科学出版社, 117-321

     

    张进江, 郑亚东. 1997. 运动学涡度和极摩尔圆的基本原理与应用. 地质科技情报, 16(3): 33-39 http://www.cnki.com.cn/Article/CJFDTOTAL-DZKQ703.006.htm

     

    郑亚东. 1999. 亚干变质核杂岩的运动学涡度与剪切作用类型. 地质科学, 34(3): 273-280 http://www.cnki.com.cn/Article/CJFDTOTAL-DZKX199903002.htm

     

    周建勋, 张国伟. 1996. 秦岭商丹带沙沟糜棱岩带的显微构造及其(p)-T-t演化路径的再认识. 地质科学, 31(1): 33-42

  • 加载中

(14)

(2)

计量
  • 文章访问数:  1499
  • PDF下载数:  1206
  • 施引文献:  0
出版历程
收稿日期:  2016-02-22
修回日期:  2016-10-01
刊出日期:  2017-06-01

目录