First report of reef formation from the Balkanide type of Triassic: the Tran Formation (Upper Triassic) near the village of Gorna Sekirna, SW Bulgaria | Zendy

Горен Триас | Zendy; Ю Секирна | Zendy; Athanas България | Zendy; Атанас Chatalov | Zendy

Open Access

First 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,

Атанас Chatalov

Publication year - 2020

Publication title -

review of the bulgarian geological society

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.

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