大别山陆—陆点碰撞和构造超压的形成

武红岭; 董树文

Volume 26 Issue 5

Sep. 2001

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Article Navigation > Earth Science > 2001 > 26(5): 457-463

Wu Hongling, Dong Shuwen, 2001. A POINT-COLLISION MECHANICAL MODEL AND TECTONIC PRESSURE FORMING IN DABIE OROGENIC BELT. Earth Science, 26(5): 457-463.

Citation:

Wu Hongling, Dong Shuwen, 2001. A POINT-COLLISION MECHANICAL MODEL AND TECTONIC PRESSURE FORMING IN DABIE OROGENIC BELT. Earth Science, 26(5): 457-463.

Wu Hongling, Dong Shuwen, 2001. A POINT-COLLISION MECHANICAL MODEL AND TECTONIC PRESSURE FORMING IN DABIE OROGENIC BELT. Earth Science, 26(5): 457-463.

Citation:

Wu Hongling, Dong Shuwen, 2001. A POINT-COLLISION MECHANICAL MODEL AND TECTONIC PRESSURE FORMING IN DABIE OROGENIC BELT. Earth Science, 26(5): 457-463.

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A POINT-COLLISION MECHANICAL MODEL AND TECTONIC PRESSURE FORMING IN DABIE OROGENIC BELT

Institute of Geomechanics, Chinese Academy of Geological Science, Beijing 100081, China

Received Date: 2001-04-13
Publish Date: 2001-09-25

Abstract

Abstract

Based on the geological feature and the paleomagnetic evidence of the collision of the North and South China Blocks, a point-collision model for the collision of A-A type is given to study phenomenon of stress concentration in Dabie orogenic belt. By using finite element method, we discuss the effect of tectonic pressure on forming UHP metamorphic rocks and its possible forming depth. The results show that: On the condition of this paper, (1) The initial collision between two continents would cause the tectonic average stress near the collisional point to increase by 5-9 times as compared with regional stress field. Under the 100 MPa boundary force, the proportion of tectonic pressure in UHP is about 20%-35%. (2) For the reason of having action of tectonic pressure, UHP rocks likely form in the depth of 65-80 km. (3) If we solely consider the collision way but not the differences of rock mechanical property and other factors, the influence of tectonic stress is limited and lithostatic pressure will still play a main role in forming UHP metamorphic rocks.
- UHPM rock,
- point-collision between two continents,
- tectonic stress,
- Dabie orogenic belt

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References(23)

References

[1]	Chavagnac V, Jahu B M. Coesite-bearing eclogites from the Bixiling complex, Dabie mountains, China: Sm-Nd ages, geochemical characteristics and tectonic implications [J]. Chem Geol, 1996, 133: 29-51. doi: 10.1016/S0009-2541(96)00068-X
[2]	王清晨, 从柏林. 大别山超高压变质岩的地球动力学意义[J]. 中国科学(D辑), 1996, 26(3): 271-281. doi: 10.3321/j.issn:1006-9267.1996.03.007
[3]	徐佩芬, 孙若昧, 刘福田. 扬子板块俯冲、断离的地震层析成象证据[J]. 科学通报, 1999, 44(15): 1658-1661. doi: 10.3321/j.issn:0023-074X.1999.15.019
[4]	刘福田, 刘建华, 何建坤, 等. 滇西特提斯造山带下的扬子地块的俯冲板片[J]. 科学通报, 2000, 45(1): 79-84. doi: 10.3321/j.issn:0023-074X.2000.01.017
[5]	Brace W F, Ernst W G. An experimental study of tectonic overpressure in Francisan rocks[J]. Geol Soc Am Bull, 1970, 81(5): 1325-1338. doi: 10.1130/0016-7606(1970)81[1325:AESOTO]2.0.CO;2
[6]	Green HW. Metastable growth of coesite in high strained quartz[J]. J Geophys Res, 1972, 77(14): 2478-2482. doi: 10.1029/JB077i014p02478
[7]	Ernst W G. Tectonic history of subduction zones inferred from retrograde blueschist pT paths[J]. Geology, 1988, 16(12): 1081-1084. doi: 10.1130/0091-7613(1988)016<1081:THOSZI>2.3.CO;2
[8]	Smith D C. On ultrametability and other problematical petrological/geodynamical models for the origin and evolution of UHPM in crustal-derived terranes[J]. Terra Abstracts Suppl 4 to Terra Nova, 1993, 5: 24-25.
[9]	Mancktelow N S. Tectonic overpressure in competent mafic layers and the development of isolated eclogites[J]. J Metam Geol, 1993, 11: 801-812. doi: 10.1111/j.1525-1314.1993.tb00190.x
[10]	Mancktelow N S. Nonlithostatic pressure during sediment subduction and the development and exhumation of high-pressure metamorphic rocks[J]. J Geophys Res, 1995, 100(B1): 571-583. doi: 10.1029/94JB02158
[11]	England P C, Thompson A B. Pressure-temperaturetime path of regional metamorphism[J]. J Petrol, 1984, 25: 894-928. doi: 10.1093/petrology/25.4.894
[12]	Coleman R G, Wang X M. Overview of the geology and tectonic of UHPM, ultrahigh pressure metamorphism [M]. London: Cambridge University Press, 1995. 1-32.
[13]	王方正. 高压、超高压变质岩形成深度讨论[J]. 地球科学———中国地质大学学报, 1996, 21(1): 41-44. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX601.005.htm
[14]	吕古贤, 陈晶. 构造附加静水压力研究与含柯石英榴辉岩成岩深度测算[J]. 科学通报, 1988, 43(24): 2590-2602.
[15]	王清晨, 刘景波, 从柏林. 构造超压能引起超高压变质作用吗?[J]. 科学通报, 1999, 44(21): 2346-2352. doi: 10.3321/j.issn:0023-074X.1999.21.023
[16]	武红岭, 董树文. 大别山超高压岩石形成的碰撞力学机理[A]. 见: 中国地质学会. "九五"全国地质科技重要成果论文集[C]. 北京: 地质出版社, 2000. 50-57.
[17]	金振民. 喜马拉雅造山带西构造结含柯石英榴辉岩的发现及其启示[J]. 地质科技情报, 1999, 18(3): 1-5.
[18]	钟大赉, 丁林. 西藏南迦巴瓦峰地区的高压麻粒岩[J]. 科学通报, 1995, 40: 1343. doi: 10.3321/j.issn:0023-074X.1995.14.029
[19]	Zienkiewicz O C. The finite element method[M]. 3rd edition. London: McGraw-Hill Book Company(UK) Limited, 1977.
[20]	Richardson R M, Solomon S C, Sleep N H. Tectonic stressin the plates[J]. Rev Geophys, 1979, 17: 981-1019. doi: 10.1029/RG017i005p00981
[21]	王世民, 王仁. 线弹性问题与牛顿流体问题的对应关系[J]. 地球物理学报, 2000, 43(1): 91-96. doi: 10.3321/j.issn:0001-5733.2000.01.011
[22]	Yang Z Y, Courtillot V, Besse J, et al. Jurassic paleomagnetic constraints on the collision of the North and South China Blocks[J]. Geophys Res Lett, 1992, 19 (6): 577-580. doi: 10.1029/91GL02416
[23]	董树文, 吴宣志, 高锐, 等. 大别造山带地壳速度结构与动力学[J]. 地球物理学报, 1998, 41(3): 349-361. doi: 10.3321/j.issn:0001-5733.1998.03.008