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METHOD FOR ASSESSMENT OF THE MONOLITHIC PATTERN OF A MASSIF BY ANALYSIS OF MACRO- AND MICROFRACTURING OF IGNEOUS ROSKS

A. F. Ivanov

First published: 2018-06-20https://doi.org/10.5593/sgem2018/1.1/s01.030View metrics

Abstract

The monolithic pattern of rocks from two large intrusive massifs in the Fennoscandian Shield is assessed by analyzing their macro- and microfracturing. Macro- and microfracturing was analyzed on rapakivi granites from the Neoproterozoic Salmi multi-phase massif and gabbrodolerite from the Paleoproterozoic Ropruchei sill. Macrofracturing was studied on bedrock exposures in the field. Macrofracturing is understood as a fracture which is visible within the rock exposure and which varies in size from 10 cm to 100 m. Microfracturing was analyzed by the optical method using thin sections of rocks prepared from oriented samples collected in the field. A microfracture is a fracture which is visible under the microscope and which varies in size from 0.01 cm to several centimetres. The results of the study have revealed a correlation in the orientation of well-defined macro- and microfracturing visible on stereographic diagrams. Macro- and microfracturing is correlated with the general pattern of the tectonic dislocation of rock massifs. Correlation analysis of macro- and microfracturing is made to delineate more monolithic rock zones in massifs. Within a deposit such analysis is made to assess the quality of zones, especially when analysis of macrofracturing alone does not give a reliable answer.

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Publication details

Title
METHOD FOR ASSESSMENT OF THE MONOLITHIC PATTERN OF A MASSIF BY ANALYSIS OF MACRO- AND MICROFRACTURING OF IGNEOUS ROSKS
Authors
A. F. Ivanov
Proceedings
SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 18th International Multidisciplinary Scientific GeoConference SGEM2018, Science and Technologies in Geology, Exploration and Mining
Publisher
STEF92 Technology
Year
2018
Pages
229-236
SWS Citekey
Ivanov20181229236
ISSN
1314-2704
ISBN
978-619-7408-35-5
Language
en
Publication type
Conference Paper
Proceedings contents
Open official contents
Keywords
intrusive massifmacrofracturingmicrofracturingmonolithic patternrapakivi granitegabbrodolerite.
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