NEW PALEOMAGNETIC DATA FOR THE HAUTERIVIAN-APTIAN DEPOSITS OF THE MIDDLE VOLGA REGION: A POSSIBILITY OF GLOBAL CORRELATION AND DATING OF TIME-SHIFTING OF STRATIGRAPHIC BOUNDARIES
Abstract and keywords
Abstract (English):
The aim of this project was to study the paleomagnetic stratigraphy of the Hauterivian-Aptian deposits in the Middle Volga region, namely in the areas of the Saratov, Samara, and Uliyanovsk right-hand Volga areas. Original data were obtained for the first time for the magnetic polarity of the Hauterivian and Barremian rocks of the Russian Platform. The results obtained for the Aptian rocks agree very well with the results of the previous paleomagnetic studies which had been carried out in the Uliyanovsk region earlier Baraboshkin et al., 1999 and in the vicinities of Saratov City Grishanov, 1984. Based on the complex correlation of the bio- and magnetostratigraphic data for the rocks from the Middle Volga region, the North Caucasus, the North Mediterranean area, and South England, it is shown that the stage and substage boundaries of the Hauterivian, Barremian, and Aptian stages differ in terms of the absolute age from the similar boundaries in the Boreal Belt by a value of some 105 -106 years, which is comparable with the duration of the Early Cretaceous ammonite zones. The diachronism of the Lower Aptian ammonite zones Deshayesites volgensis - D. forbesi and of the Middle Aptian Parahoplites melchioris zone in different regions. The results of this study called for a complex substantiation and tracing of the units of the General Stratigraphic Scale GSS. The basic GSS unit must be a stage, rather than a zone, because where boundaries were traced over a large territory, the asynchronism of the boundaries between the zones is comparable with the duration of the zones, whereas in the case of a stage it is 1-2 orders of magnitude lower. Geomagnetic inversions or isotopic data can be used to test the isochronism of stratigraphic boundaries.

Keywords:
paleomagnetic data, global correlation, stratigraphic boundaries, dating, Middle Volga region.
Text
Publication text (PDF): Read Download
References

1. Baraboshkin, The Lower Cretaceous of the East European Platform: Stratigraphy, Paleogeography, and Boreal-Tethyan Correlation, 2001.

2. Baraboshkin, Tethyan/Boreal Cretaceous Correlation. Mediterranean and Boreal Cretaceous Paleobiogeographic Areas in Central and Eastern Europe, J. Michalik Ed., 2002.

3. Baraboshkin, Stratigraphy and Geol. Correlation, v. 10, no. 6, 2002.

4. Baraboshkin, Geol. Res. Inst., Geol. Depart., New Series, Collection of Papers, Iss. 1, 1999.

5. Baraboshkin, Byul. MOIP, Ser. Geol., v. 76, no. 3, 2001.

6. Baraboshkin, Palaeoclimatology, and Paleoecology, v. 196, no. 1-2, 2003., doi:https://doi.org/10.1016/S0031-01820300318-3

7. Bazhenov, Physics of the Earth, no. 7, 1978.

8. Bazhenov, Physics of the Earth, no. 6, 1985.

9. Biske, General Phanerozoic Stratigraphic Scale, 2001.

10. Channell, Earth Planet. Sci. Lett., v. 108, 1992., doi:https://doi.org/10.1016/0012-821X9290020-V

11. Channell, Earth Planet. Sci. Lett., v. 134, 1995., doi:https://doi.org/10.1016/0012-821X9500111-O

12. Cretaceous Zones..., Cretaceous Zones in the USSR, 1989.

13. Grishanov, Geology of South Ural and Volga Region: Stratigraphy and Lithology, 1984.

14. Grishanov, Nedra Povolzhiya and Prikaspiya, Iss. 33, 2003.

15. Guzhikov, Proc. IV All-Union Conference on Geomagnetism, Abstracts of Papers, 1991.

16. Guzhikov, Abstracts of papers, Conference on the Paleomagnetism and Magnetism of Rocks, Borok, September 24-29, 2000, 2000.

17. Guzhikov, Problems of Regional and Local Phanerozoic Stratigraphy in the Volga and North Caspian Regions, October 9-12, 2001, Saratov, 2001.

18. Cuzhikov, Abstr. Annual Assembly of IGCP Project no. 362 "Tethyan and Boreal Cretaceous'', Maastricht, 17-18 September, 1995.

19. Guzhikov, Geodiversitas, v. 21, no. 3, 1999.

20. Eremin, Magnetic Stratigraphy of Aptian Rocks in the Northeast of the North Caucasus Region, 1991.

21. Erba, Bull. Inst. Royal des Sci. Nat. Belgique, v. 66, 1996.

22. Haq, Special Publ., no. 42, Sea-level changes: An integrated approach, 1988.

23. Kerth, J. Geol. Soc., London, v. 145, 1988.

24. Khramov, Paleomagnetology, Nedra Publ., 1982.

25. Leahy, Can. J. Earth Sci., v. 32, 1995.

26. Mikhailova, Paleontolog. J., no. 4, 2001.

27. Molostovskii, Magnetostratigraphy and its significance in geology, 1997.

28. Mutterlose, Palaeontographica, Abt. A, 1983.

29. Mutterlose, Palaeoclimatology, Palaeoecology, Elsevier, v. 59, no. 144, 1998., doi:https://doi.org/10.1016/S0031-01829800081-9

30. Ogg, AGU Reference Shelf, v. 1, 1999.

31. Proceedings..., Proceedings "Second International Symposium on Cretaceous Stage Boundaries'', Brussels, September 8-16, 1995, Bul. Instit. Royal des Sci. Nat. Belgique, vol. 66, Suppl., 1996.

32. Shipunov, Paleomagnetic analysis principles: Theory and practice, 1993.

33. Stratigraphic Code..., Stratigraphic Code, 1992.

34. Supplement..., Supplement to the Stratigraphic Code of Russia, 2000.

35. Van der Voo, Palaeomagnetism of the Atlantic, Tethys and Iapetus Oceans, 1993.

Login or Create
* Forgot password?