eesti teaduste
akadeemia kirjastus
SINCE 1984
Oil Shale cover
Oil Shale
ISSN 1736-7492 (Electronic)
ISSN 0208-189X (Print)
Impact Factor (2021): 1.442
PDF | doi: 10.3176/oil.2008.2S.09

Kalmer Sokman, V. KATTAI, R. VAHER, Y. J. SYSTRA

Three 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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