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About the journal

SEISMICHESKIE PRIBORY, ISSN: 0131-6230, eISSN: 2312-6965, DOI: 10.21455/si,

http://elibrary.ru/title_about.asp?id=25597

English Translation: Seismic Instruments, ISSN: 0747-9239 (Print) 1934-7871 (Online),

https://link.springer.com/journal/11990

Infrared spectroscopy study of the shear crack surfaces structure in rocks

V.I. Vettegren1, A.V. Ponomarev2, K. Arora3, R.I. Mamalimov1, V.B. Kulik1

1 Ioffe Physical-Technical institute Russian Academy of Sciences, Saint Petersburg, Russia

2 Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia

3 CSIR National Geophysical Research Institute, Hyderabad, India

Corresponding author: A.V. Ponomarev, e-mail: avp@ifz.ru

Abstract. To study the mineral composition of the crack shear surface in the core from the well in the seismically active area of Koyna-Warna, Western India, associated with reservoir triggered seismicity, infrared reflection and transmission spectroscopy methods were used. Methods of conducting a complex of experimental studies of mineral composition of the crack shear surfaces in the rocks are described. The performed experiments demonstrated the wide possibilities of these methods and allowed us to obtain new results on shear cracks that are important for further studies on earthquake physics. It is established that the crack shear surface of studied sample is a three-layer structure. The upper layer contains only glauconite nanocrystals. Under it, there is a layer that contains crystals of calcite and montmorillonite in addition to glauconite. Total thickness of these layers is about 600 µm. Below these layers is the host rock containing calcite, dolomite and glauconite. The number of illite-smectite layers in glauconite nanocrystals was determined. Upper layer contains nanocrystals consisting of ~ 30 layers. In the second layer, crystals of this mineral contain ~25 layers. Finally, glauconite nanocrystals in the host rock consist of ~20 layers.

Keywords: mineral composition, shear crack surface; infrared spectroscopy.

About the authors

VETTEGREN Victor Ivanovich – Doctor of physical and mathematical sciences, Professor, Leading scientist, Ioffe Physical-Technical Institute, RAS, 194021. St. Petersburg, Polytekhnicheskaya st., 26. Phone: +7(921) 949-20-87. E-mail: Victor.Vettegren@mail.ioffe.ru

PONOMAREV Alexander Veniaminovich – Doctor of physical and mathematical sciences, Schmidt Institute of Physics of the Earth, RAS, Chief scientist, Head of Laboratory. 123242, Moscow, Bolshaya Gruzinskaya str., 10-1. Phone: +7(499) 254-88-41. E-mail: avp@ifz.ru 

ARORA Kusumita – PhD, principal scientist, National Geophysical Research Institute, Hyderabad, India. E-mail: karora_ngri@yahoo.co.uk 

MAMALIMOV Rustam Ismagilovich– Candidate of Engineering sciences, Scientist, Ioffe Physical-Technical Institute, RAS, 194021. St. Petersburg, Polytekhnicheskaya st., 26. Phone: +7(905)-264-62-12. E-mail: mamalun@mail.ru

KULIK Vitaly Borisovich – Candidate of Physico-mathematical sciences, Scientist, Ioffe Physical-Technical Institute, RAS, 194021. St. Petersburg, Polytekhnicheskaya st., 26. Phone: +7(921) 326-20-41. E-mail: vitaly.kulik@mail.ioffe.ru.

Cite this article as: Vettegren V.I., Ponomarev A.V., Arora K., Mamalimov R.I., Kulik V.B. Infrared spectroscopy study of the shear crack surfaces structure in rocks. Voprosy Inzhenernoi Seismologii (Problems of Engineering Seismology), 2018, Vol. 45, No. 4, pp. 25–36. [in Russian]. DOI: 10.21455/VIS2018.4-2

English translation of the article will be published in Seismic Instruments, ISSN: 0747-9239 (Print) 1934-7871 (Online), https://link.springer.com/journal/11990), 2019, Volume 55, Issue 4.