INFLUENCE OF TECTONIC DISLOCATIONS ON OIL SHALE MINING IN THE ESTONIA DEPOSIT
2008; Estonian Academy Publishers; Volume: 25; Issue: 2s Linguagem: Inglês
10.3176/oil.2008.2s.09
ISSN1736-7492
AutoresK SOKMAN, V. Kattai, Rein Vaher, Ylo Systra,
Tópico(s)Geological Studies and Exploration
ResumoThree linear tectonic dislocation groups of different orientation (and probably also of different age) cut the Estonian oil shale-kukersite deposits.Two younger groups of structures are typical fault zones with N-NE and NW trends, which are expressed topographically as narrow valleys, partly infilled by till, both on land and offshore.The oldest, third group of structures is represented by narrow, somewhat curvilinear, NE-trending folded and fractured zones, associated with extensive dolomitization, hydrothermal mineralization and karst.Oil shale within these structural zones is oxidized and partly replaced by karst clay.All dislocations disrupt and complicate the structure of deposit, which affects mining conditions from the technical point of view and also causes a loss of oil shale resources.
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