Devona Ogres svītas dolomītsmilšakmeņi Kalnrēžu atsegumā un to veidošanās apstākļu rekonstrukcija

6533b7dcfe1ef96bd127192b

RESEARCH PRODUCT

Devona Ogres svītas dolomītsmilšakmeņi Kalnrēžu atsegumā un to veidošanās apstākļu rekonstrukcija

Artis Vasiļjevs

subject

Ģeoloģija bioturbācija klastiskā sedimentācija pieslīpņi plānslīpējumi Franas stāvs

description

Bakalaura darba mērķis ir raksturot Kalnrēžu atsegumu joslā sastopamo Ogres svītas dolomītsmilšakmeņu sastāvu, struktūras un tekstūras, kā arī, pamatojoties uz iegūtajiem datiem, rekonstruēt to veidošanās apstākļus. Lielākajos no pieejamiem atsegumiem tika dokumentēti 3 ģeoloģiskie griezumi, veikta pieslīpņu un plānslīpējumu izgatavošana, to analīze. Noteikts šo iežu sastāvs un uzbūve, veikti slīpslāņoto tekstūru mērījumi un raksturoti šo iežu veidošanās apstākļi. Pētījumu rezultātā noskaidrojās, ka dolomītsmilšakmeņi veidojušies mainīgos apstākļos – visticamāk plūdmaiņu kanālos un plūdmaiņu līdzenumos. To veidošanos ietekmēja bioturbācijas procesi apakšējā plūdmaiņu zonā, žūšana un brekčijizācija vidējā un augšējā plūdmaiņu zonā. Epizodiski ir notikusi tīra karbonātu sedimentācija.

year	journal	country	edition	language
2016-01-01

https://dspace.lu.lv/dspace/handle/7/32468

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