Open AccessFirst report of reef formation from the Balkanide type of Triassic: the Tran Formation (Upper Triassic) near the village of Gorna Sekirna, SW Bulgaria
Author(s) -
Горен Триас,
Ю Секирна,
Athanas България,
Athanas Chatalov
Publication year - 2020
Publication title -
spisanie na bʺlgarskoto geologičesko družestvo/spisanie na bʺlgarskoto geologičesko družestvo
Language(s) - English
Resource type - Journals
eISSN - 1314-8680
pISSN - 0007-3938
DOI - 10.52215/rev.bgs.2020.81.3.124
Subject(s) - reef , lithification , geology , cementation (geology) , paleontology , phreatic , cretaceous , early triassic , subaerial , diagenesis , oceanography , archaeology , cement , geotechnical engineering , geography , permian , aquifer , groundwater , structural basin
Sphinctozoa skeletons were the main builders in microbial-sponge boundstones and cementstones. Syndepositional lithification of associated automicrite and marine phreatic cementation by radial fibrous and radiaxial calcite favored stabilization and growth of skeleton-cement reefs across a central reef area (close to a platform margin), but without forming a wave-resistant reef framework. Storm-influenced destruction of the buildups and subsequent reworking by waves and currents produced bioclastic-intraclastic grainstones.