中国西部大陆岩石圈的有效弹性厚度研究

赵俐红; 姜效典; 金煜; 金翔龙

中国西部大陆岩石圈的有效弹性厚度研究

赵俐红^{1, 2, 3,},
姜效典⁴,
金煜⁵,
金翔龙³

1.
中国科学院海洋研究所，山东青岛 266003
2.
中国科学院研究生院，北京 100039
3.
国家海洋局第二海洋研究所海底科学重点实验室，浙江杭州 310012
4.
中国海洋大学海洋地球科学学院，山东青岛 266003
5.
ChevronTexaco Park，6001 Bollinger Canyon Road，San Ramon，CA 94583，USA

详细信息

作者简介:
赵俐红(1976—)，女，博士，从事构造地球物理研究.E-mail: zhaolih@hotmail.com

中图分类号: P31
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出版历程
- 收稿日期: 2003-07-12
- 刊出日期: 2004-03-25

Effective Elastic Thickness of Continental Lithosphere in Western China

1.
Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266003, China
2.
Graduate School, Chinese Academy of Sciences, Beijing 100039, China
3.
Laboratory of Submarine Geoscience, the Second Institute of Oceanography of State Oceanic Administration, HangzhOU 310012, China
4.
Marine Geology College, Ocean University of China, Qngdao 266003, China
5.
ChevronTexaco Park, 6001 Bollinger Canyon Road, San Ramon, CA 94583, USA

摘要

摘要: 中国西部是地球上陆地隆升最显著的地区, 有世界上新构造运动最强烈的青藏高原、规模巨大的左行走滑位移的阿尔金断裂系和中亚地区最大的板块内部造山带———天山褶皱造山带.作为印度板块与欧亚板块相互碰撞的会聚带, 本区是研究岩石圈动力学的有利场所.主要运用重力资料和地形资料来研究中国西部地区显著上地壳结构和其上地幔变形之间的关系.依据岩石圈流变学的理论, 在空间域采用垂直和水平受力的多个变刚度的三维有限差分方法来计算弹性板的有效弹性厚度.模拟结果显示中国西部地区的岩石圈有效弹性厚度存在明显的横向不均匀性, 从6~10 km的造山带区域的有效弹性厚度变到大于60 km的古陆区域的有效弹性厚度.青藏高原地区的岩石圈有效弹性厚度平均为30 km, 塔里木盆地的有效弹性厚度为40~50 km, 南、北天山的岩石圈有效弹性厚度分别为10~15 km和30 km左右, 阿尔金断裂在东经90°以西部分的岩石圈有效弹性厚度要小于90°以东部分.
- 岩石圈 /
- 弹性板 /
- 有效弹性厚度 /
- 流变学 /
- 中国西部
Abstract: Western China has the most spectacular tectonic features on the continental Earth. It possesses the world highest plateau (Tibet), the world largest intra-continental strike-slip fault (Altyn Tagh) and the world highest intra-continental mountain belt (Tienshan Mountains). As the convergence belt between India plate and Europe plate, this region is a good place for the study of lithosphere dynamics. In this paper, the authors use gravity data and topography data to demonstrate the correlation of these conspicuous upper crustal structures with the deformation of the upper mantle lithosphere in China. we compute the effective elastic thickness of the elastic plate using three-dimensional finite difference in space domain according to the rheology of the continental lithosphere. This model considers the variation of the mechanical strength in vertical and horizontal orientation. The modeling results show that the effective elastic thickness of the lithosphere in China varies significantly from elastic thickness of 6-10 km in highly deformed mountain belts to over 60 km in stable platform areas. The effective elastic thickness of Tibet, Tarim, southern Tienshan and northern Tienshan are separately 30, 40-50, 10-15 and 30 km. While the effective elastic thickness in the western portion of the Altyn Tagh fault (west of 90°E) is less than that in the eastern portion.
- lithosphere /
- elastic plate /
- effective elastic thickness /
- rheology /
- western China

HTML全文

图 1 中国大陆西部地形

Fig. 1. Topography of western China

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图 2 中国大陆西部岩石圈挠曲情况

Fig. 2. Flexure of western China lithosphere

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图 3 中国大陆西部剩余重力异常收敛情况

Fig. 3. RMS residual gravity anomaly of western China

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图 4 中国大陆西部观测布格重力异常(a)及岩石圈的理论布格重力异常(b)

Fig. 4. Observed bouguer gravity anomaly (a) and theoretical bouguer gravity anomaly (b) of western China

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图 5 中国大陆西部初始岩石圈有效弹性厚度(a)及模型计算得到的岩石圈有效弹性厚度(b)

Fig. 5. Initial effective elastic thickness (a) and calculated effective elastic thickness (b) of western China

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图 6 中国大陆西部剩余重力异常

Fig. 6. Residual gravity anomaly of western China

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参考文献(45)

Avouac, J. P., Tapponnier, P., Bai, M., et al., 1993. Active thrusting and folding along the northern Tien Shan and Late Cenozoic rotation of the Tarim relative to Dzungaria and Kazakhstan. J. Geophys. Res. , 98: 6755-6804. doi: 10.1029/92JB01963
Beckers, J., Schwartz, S. Y., Lay, T., 1994. The velocity structure of the crust and upper mantle under China from broad-band P and PP waveform analysis. Geophys. J. Int. , 119: 574-594. doi: 10.1111/j.1365-246X.1994.tb00143.x
Brown, L. D., Zhao, W., Nelson, K. D., et al., 1996. Bright spots, structure, and magmatism in southern Tibet from INDEPTH seismic reflection profiling. Science, 274: 1688-1690. doi: 10.1126/science.274.5293.1688
Ding, G. Y., 1991. Introduction of the lithospheric geodynamics of China. Seismological Press, Beijing (in Chinese).
England, P., Molnar, P., 1997. The field of crustal velocity in Asia calculated from Quaternary rates of slop on faults. Geophys. J. Int. , 130: 551-582. doi: 10.1111/j.1365-246X.1997.tb01853.x
Fielding, E., Isacks, B., Barazangi, M., et al., 1994. How flat is Tibet. Geology, 22: 163-167.
Heiskanen, W. A., Vening, M. F. A., 1958. The Earth and its gravity field. Mcgraw-Hill, New York.
Jiang, X. D., McNutt, M. K., Jin, Y., 1999. Models of lithospheric deformation beneath the Altyn Tagh and West Kunlun faults from recent gravity surveys. AGU 1999 Fall Meeting, 80, 46.
Jin, Y., 1997. State-of-stress and rheology of Tibet and its vicinity from gravity anomalies and numerical models (Dissertation).
Jin, Y., Jiang, X. D., 2002. Lithosphere dynamics. Science Press, Beijing (in Chinese).
Jin, Y., McNutt, M. K., Zhu, Y. S., 1994. Evidence from gravity and topography data for folding of Tibet. Nature, 371: 669-674. doi: 10.1038/371669a0
Jin, Y., McNutt, M. K., Zhu, Y. S., 1996. Mapping the descent of Indian and Eurasian plates beneath the Tibetan plateau from gravity anomalies. J. Geophys. Res. , 101(B5): 11275-11290. doi: 10.1029/96JB00531
Kosarev, G., Kind, R., Sobolev, S. V., et al., 1999. Seismic evidence for a detached Indian lithospheric mantle beneath Tibet. Science, 283: 1306-1309. doi: 10.1126/science.283.5406.1306
Lave, J., Avouac, J. P., Lacassin, R., et al., 1996. Seismic anisotropy beneath Tibet: Evidence for eastward extrusion of the Tibetan lithosphere. Earth and Planet. Sci. Lett. , 140(1): 83-96.
Li, S. L., Mooney, W. D., 1998. Crustal structure of China from deep seismic sounding profiles. Tectonophysics, 288: 105-113. doi: 10.1016/S0040-1951(97)00287-4
Lyon-Caen, H., Molnar, P., 1983. Constraints on the structure of the Himalaya from ananalysis of gravity anomalies and a flexural model of the lithosphere. J. Geophys. Res. , 88: 8171-8192. doi: 10.1029/JB088iB10p08171
Lyon-Caen, H., Molnar, P., 1984. Gravity anomalies and the structure of the western Tibet and the southern Tarim basin. Geophys. Res. Lett. , 11: 1251-1254. doi: 10.1029/GL011i012p01251
Ma, X. Y., 1989. Lithospheric geodynamics atlas of China. China Map Press, Beijing, 4(in Chinese).
Masek, J. G., Isacks, B. L., Fielding, E. J., 1994. Rift flank uplift in Tibet: Evidence for a viscous lower crust. Tectonics, 13(2): 659-667.
McNamara, D. E., Owens, T. J., Walter, W. R., 1996. Propagation characteristics of Lg across the Tibetan plateau. Bull. Seismol. Soc. Am. , 86: 457-469. doi: 10.1785/BSSA0860020457
McNutt, M. K., Diament, M., Kogan, M. G., 1988. Variations of elastic thickness at continental thrust belts. J. Geophys. Res. , 93: 8825-8838. doi: 10.1029/JB093iB08p08825
Nelson, K. D., Zhao, W. J., Brown, L. D., et al., 1996. Partially molten middle crust beneath southern Tibet: Synthesis of Project INDEPTH results. Science, 274: 1684-1687. doi: 10.1126/science.274.5293.1684
Parker, R. L., 1972. The rapid calculation of potential anomalies. Geophys. J. R. Astr. Soc. , 31: 447-455.
Roecker, S. W., Sabitova, T. M., Vinnik, L. P., et al., 1993. Three-dimensional elastic wave velocity structure of the western and central Tien Shan. J. Geophys. Res. , 98(B9): 15779-15795. doi: 10.1029/93JB01560
Sun, W., 1989. Bouguer gravity anomaly map of the People's Republic of China. Chinese Academy of Geo-exploration, Beijing.
Torne, M., Fernanadez, M., Comas, M. C., et al., 2000. Lithospheric structure beneath the Alboran basin: Results from 3D gravity modeling and tectonic relevance. J. Geophys. Res. , 105(B2): 3209-3227. doi: 10.1029/1999JB900281
Wang, Y., Xu, H. Z., 1996. The variations of lithospheric flexural strength and isostatic compensation mechanisms beneath the continent of China and vicinity. Chinese Journal of Geophysics, 39(Suppl): 105-113 (in Chinese with English abstract. http://en.cnki.com.cn/Article_en/CJFDTOTAL-DQWX6S1.011.htm
Wang, Y., Wang, J. Y., Xiong, L. P., et al., 2001. Lithospheric geothermics of major geotectonic units in China mainland. Acta Geoscientia Sinica, 22(1): 17-22 (in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTOTAL-DQXB200101003.htm
Wees, J. D., Cloetingh, S., 1994. A finite difference technique to incorporate spatial variations in rigidity and planar faults into 3D models for lithospheric flexure. Geophys. J. Int. , 117: 179-195. doi: 10.1111/j.1365-246X.1994.tb03311.x
Xu, Y., Liu, F. T., Liu, J. H., et al., 2001. Deep features of continental collision belts in northwestern China and their dynamic implications. Chinese Journal of Geophysics, 44(1): 40-47 (in Chinese with English abstract. doi: 10.1002/cjg2.113
Yin, A., Harrison, T. M., Ryerson, F. J., et al., 1994. Tertiary structural evolution of the Gangdese thrust system, southeastern Tibet. J. Geophys. Res. , 99(B9): 18175-18201. doi: 10.1029/94JB00504
Yin, A., Nie, S., Craig, P., et al., 1998. Late Cenozoic tectonic evolution of the southern Tien Shan. Tectonics, 17(1): 1-27. doi: 10.1029/97TC03140
Yuan, B. Q., Yvette, H. P. D., Wang, P., et al., 2002. Effective Lithospheric elastic thickness of southeastern part of Arctic Ocean-Eurasia continent-Pacific Ocean geoscience transect. Earth Science—Journal of China University of Geosciences, 27(4): 397-402 (in Chinese with English abstract.
Zeng, R. S., Ding, Z. F., Wu, Q. J., et al., 2000. Seismological evidences for the multiple incomplete crustal subductions in Himalaya and southern Tibet. Chinese Journal of Geophysics, 43(6): 780-797 (in Chinese with English abstract. http://en.cnki.com.cn/Article_en/CJFDTotal-DXQY2000S1212.htm
Zhao, W. J., Nelson, K. D., Project INDEPTH Team, 1993. Deep seismic reflection evidence for continental under thrusting beneath southern Tibet. Nature, 366(9): 557-559.
Zhou, H., 2000. Progress on studies of rheological dynamics of continental lithosphere. Earth Science Frontiers, 7(Suppl): 121-127 (in Chinese with English abstract.
丁国瑜, 1991. 中国岩石圈动力学概论. 北京: 地震出版社.
金煜, 姜效典, 2002. 岩石圈动力学. 北京: 科学出版社.
马杏垣, 1989. 中国岩石圈动力学地图集. 北京: 中国地图出版社, 4.
汪洋, 汪集, 熊亮萍, 等, 2001. 中国大陆主要地质构造单元岩石圈地热特征. 地球学报, 22(1): 17-22. doi: 10.3321/j.issn:1006-3021.2001.01.004
王勇, 许厚泽, 1996. 中国大陆及其邻区岩石层挠曲强度变化和均衡补偿机制. 地球物理学报, 39(增刊): 105-113. https://www.cnki.com.cn/Article/CJFDTOTAL-DQWX6S1.011.htm
胥颐, 刘福田, 刘建华, 等, 2001. 中国西北大陆碰撞带的深部特征及其动力学意义. 地球物理学报, 44(1): 40-47. doi: 10.3321/j.issn:0001-5733.2001.01.005
袁炳强, Yvette, H. P. D., 王平, 等, 2002. 北冰洋—欧亚大陆—太平洋地学断面东南段岩石圈有效弹性厚度. 地球科学———中国地质大学学报, 27(4): 397-402. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX200204009.htm
曾融生, 丁志峰, 吴庆举, 等, 2000. 喜马拉雅及南藏的地壳俯冲带———地震学证据. 地球物理学报, 43(6): 780-797. doi: 10.3321/j.issn:0001-5733.2000.06.007
周辉, 2000. 大陆岩石圈流变动力学研究进展. 地学前缘, 7(增刊): 121-127. https://www.cnki.com.cn/Article/CJFDTOTAL-DXQY2000S2018.htm