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NEW TYPE OF BRITTLE DEFORMATIONS: TWO-AXIAL TURN STRUCTURE OF FRACTURES IN THE KOVDOR CARBONATITE INTRUSION (NW RUSSIA)

Dmitry Zhirov

First published: 2017-06-20https://doi.org/10.5593/sgem2017/11/s01.048View metrics

Abstract

The investigation of the fault tectonics in the Kovdor carbonatite intrusion (NW Russia) has resulted in the identification of a new brittle deformations type. It is formed due to the simultaneous turn of fissure planes at discrete angles around two orthogonal guiding lines (axes), where one is represented by a vertical massif symmetry axis (L1), and the other axis (L2) lies horizontally in the fracture plane. Nonetheless, the rotation along the both axes is codirectional, i.e., when moving counterclockwise around the L1 axis, the L2 rotation is also counterclockwise. If we very tentatively consider a fissure as an ellipse, and take into account the whole assemblage of long and short axes, the overall picture of their spatial distribution generates a screw conoid or ordinary helicoid type structure. It will be shown as an S-shaped plane poles chain in the stereogram. A sequence of large scale fissures (longer than 100 meters), which are 25 to 100 meters apart from each other and regularly vary in strike and dip angle, is mapped in the open pit of the Kovdor apatite-magnetite deposit. This is a new type of brittle deformations, which is of significance for the interpretation of evolutional features and modern state of the stress field in the Kovdor central-type carbonatite intrusion.

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Publication details

Title
NEW TYPE OF BRITTLE DEFORMATIONS: TWO-AXIAL TURN STRUCTURE OF FRACTURES IN THE KOVDOR CARBONATITE INTRUSION (NW RUSSIA)
Authors
Dmitry Zhirov
Proceedings
SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 17th International Multidisciplinary Scientific GeoConference SGEM2017, Science and Technologies in Geology, Exploration and Mining
Publisher
STEF92 Technology
Year
2017
Pages
375-382
SWS Citekey
Zhirov20171375382
ISSN
1314-2704
ISBN
978-619-7105-98-8
Language
en
Publication type
Conference Paper
Keywords
fault tectonicsdeformationbrittlefissureminingcarbonatite intrusioncentral (ring)-type massif
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