DEEP STRUCTURE OF THE EURASIA-PACIFIC TRANSITION ZONE
Аннотация и ключевые слова
Аннотация (русский):
The deep structure of the Eurasia-Pacific transition zone was investigated under the Geotraverse International Project along the deep sections of the tectonosphere, including the lithosphere and the asthenosphere, based on the complex interpretation of geological and geophysical data. The first geotraverse, investigated in cooperation with Japanese geoscientists, crossed the region of the Japan Sea. The second geotraverse, investigated in cooperation with Japanese and Chinese geoscientists, crossed the region of the Philippine Sea and the North China Plain. The third geotraverse crossed the region of the Okhotsk Sea. The total length of the geotraverses amounted to a few thousand kilometers with a depth of 100nbsp;km. The structure of the study region is distinguished by the fact that its upper mantle includes an asthenosperic layer with its diapirs of hot anomalous mantle, responsible for the formation of a transitional zone. The asthenosphere has a depth of 50-80nbsp;km under the old Paleogene basins, such as the West Philippine Basin, a roughly 30-km depth under the Neogene basins, such as the Parece Vela Basin of the Philippine Sea or the Kuril Basin of the Okhotsk Sea, and a merely 20-10-km depth under the Pliocene-Quaternary inter-arc basins, where it caused the break-up of the lithosphere, the formation of rifts, basalt magma flow, and hydrothermal activity. The sedimentary basins of the marginal seas are distinguished by an abnormal deep structure characterized by the localization of asthenospheric diapirs under these basins, the development of rifts and spreading centers at their bases, volcanic activity during the early phase of their formation, associated with hydrothermal processes and sulfide formation, and the high heat flow caused by the rise of the asthenosphere toward the surface. It appears that the asthenospheric diapirs with the partial melting of rocks represent channels by which hot mantle fluids from the asthenosphere penetrate to the sedimentary basins. Based on these geotraverses, researchers from the Geophysical Center of the Russian Academy of Sciences created a database including the deep geological and geophysical sections of the lithosphere under the transition zone from Eurasia to the Pacific and the related primary geological and geophysical data, the results of the bathymetric, magnetic, and gravity surveys, heat flow measurements, deep seismic sounding, tomography, seismology, the results of studying the fine structure of the Benioff zone, some data on the chemistry and age of the rocks, and the results of deep-sea drilling and dredging.

Ключевые слова:
transition zone, geotraverse, asthenosphere.
Текст
Текст произведения (PDF): Читать Скачать
Список литературы

1. Abe, Island Arcs and Marginal Seas, M. Hoshino and H. Aoki, Eds., 1970.

2. Anderson, V Mire Nauki, v. 12, 1984.

3. Asada, The Geophysics of the Pacific Ocean Basin and Its Margin, Monogr. no. 19, 1976.

4. Avdeiko, Explanatory Notes to the Tectonic Map of the Okhotsk Sea Region, 2000.

5. Baranov, Dokl. Akad. Nauk, v. 367, no. 3, 1999.

6. Bijwaard, J. Geophys. Res., v. 103, no. B12, 1998., doi:https://doi.org/10.1029/98JB02467

7. Bloomer, The Tectonic and Geologic Evolution of Southeast Asian Seas and Islands, Part 2 D. E. Hayes, Ed., Geophys. Monogr. 27, 1983.

8. Boldyrev, Density Inhomogeneities in the Lithosphere and the Dynamics of the Northwestern Segment of the Pacific Belt, 1993.

9. Burmin, Vulkanologiya i Sesmologiya, no. 2, 1992.

10. Cadet, Earth Planet. Sci. Lett., v. 83, no. 1-4, 1987., doi:https://doi.org/10.1016/0012-821X8790074-4

11. Cong, Geol. Reviewer, v. 29, no. 1, 1983.

12. Craig, EOS Trans. Amer. Geophys. Union, v. 68, 1987.

13. Cruise Reports..., Cruise Reports: Komex V and VI Kuril and Okhotsk Sea Marine Experiment, Biebow N., Ludmann T., Karp B., and Kulinich R. Eds., 2000.

14. Crustal Structure..., Crustal Structure in the Asia-Pacific Transition Zone, Galperin E. I. and Kosminskaya I. P. Eds., 1964.

15. Deep Seismic Sounding..., Deep Seismic Sounding, Data for the Pacific Ocean, Kosminskaya I. P., Rodnikov A. G., and Semenova G. I. Eds., 1987.

16. Fedotov, Izv. AN SSSR, Ser. Geophiz., no. 5, 1963.

17. Grachev, Recent Tectonics, Geodynamics and Seismicity in North Eurasia, 2000.

18. Hasegawa, Nature, v. 352, no. 6337, 1991., doi:https://doi.org/10.1038/352683a0

19. Hilde, Tectonophysics, v. 102, 1983., doi:https://doi.org/10.1016/0040-19518490009-X

20. Hirata, J. Geophys. Res. Lett., v. 19, 1991.

21. Hobart, EOS Trans. Amer.Geophys. Union, v. 64, 1983.

22. Honza, Japan Sea, no. 10, 1979.

23. Huang, Tectonics of Asia, 1984.

24. Hussong, Init. Reports DSDP, 60, 1981.

25. Jolivet, Active Margins and Marginal Basins of the Western Pacific, Geophys. Monograph, v. 88, 1995.

26. Karig, Initial Reports of the Deep Sea Drilling Project 31, 1975.

27. Kononov, The Geology of the Pacific Floor and the Zone of Transition to the Asian Continent, Ed. B. I. Vasiliev, 1989.

28. Kuge, Bull. Seism. Soc. Am., v. 86, no. 2, 1996.

29. Larson, Initial Reports of the Deep Sea Drilling Project 32, 1975.

30. Letouzey, Marine Petrol. Geology, v. 2, 1985., doi:https://doi.org/10.1016/0264-81728590002-9

31. Li Desheng, Acta Oceanologica Sinica, v. 1, no. 1, 1982.

32. Liu, Science Sinica, v. B26, 1983.

33. Lyapishev, Tikhookean. Geol., no. 4, 1987.

34. Maruyama, The Island Arc, v. 6, no. 1, 1997., doi:https://doi.org/10.1111/j.1440-1738.1997.tb00043.x

35. Mrozowski, Earth Planet. Sci. Lett., v. 46, 1979., doi:https://doi.org/10.1016/0012-821X7990065-7

36. North China Plain..., North China Plain - Philippine Sea - Mariana Trench Geotraverse, Rodnikov A. G., Isezaki N., Shiki Z., Uyeda S., and Liu Guodong Eds., 1991.

37. Obzhirov, The Gas Geochemical Zonation and Mineral Assemblages of the Okhotsk Sea Floor, 1999.

38. Piip, Proc. 30th International Geol. Congress, v. 20, 1996.

39. Rodkin, Phys. Earth Planet. Inter., v. 15, no. 3/4, 1996.

40. Rodnikov, Vestnik Akad. Nauk SSSR, no. 2, 1986.

41. Rodnikov, EAGE Conference, vol. 2, 1997.

42. Rodnikov, 62nd EAGE Conference and Technical Exhibition, 2000.

43. Rodnikov, Marine Geophys. Res., v. 7, 1985., doi:https://doi.org/10.1007/BF00316775

44. Rodnikov, Physics of the Earth, no. 12, 1996.

45. Rodnikov, The General Problems of Tectonics, The Tectonics of Russia, 2000.

46. Rodnikov, 3d V.V. Fedynsky Geophysical Readings, 2001.

47. Seekins, J. Geophys. Res., v. 82, 1977.

48. Shcheka, Dokl. Akad. Nauk SSSR, v. 2, 1986.

49. Shiki, K. Leggett, Ed., Trench-Forearc Geology: Sedimentation and Tectonics on Modern and Ancient Active Plate Margins, Geological Society Special Publication 10, 1982.

50. Shiono, Carnegie Inst. Washington Yearbook 79, 1980.

51. Smith, J. Geophys. Res., v. 94, 1989.

52. Smirnov, Heat Flow Map of Northern Eurasia and Methods of Analyzing the Thermal Structure of the Lithosphere, 1986.

53. Snegovskoi, Seismic Reflection Survey and the Tectonics of the Southern Okhotsk Sea and the Pacific Margin, 1974.

54. Structure and dynamics..., Results of Researches on the International Geophysical Projects, Rodnikov A. G., Tuezov I. K, and Kharahinov V. V. Eds., 1996.

55. Tamaki, v. 127/128, 1992.

56. Teng, Acta Geophys. Sinica, v. 25, no. 1, 1982.

57. The Geology..., The Geology of the Philippine Sea, Peive, A. V. Ed., 1980.

58. Tronov, Tikhookean. Geologiya, no. 6, 1987.

59. Tuezov, The lithosphere of transition zone from Asia to Pacific, 1975.

60. Uyeda, Episodes, v. 14, no. 3, 1991.

61. Varnavskii, Tikhookean. Geol., no. 3, 1994.

62. Vasiliev, Tikhookean. Geol., no. 3, 1985.

63. Wu, Geochemistry, v. 6, no. 3, 1987.

64. Zlobin, Structure of the Earth Crust and Upper Mantle under the Kuril Island Arc from Seismic Data, 1987.

Войти или Создать
* Забыли пароль?