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Drowning of microbial mounds on the slopes of the Latemar Platform (Middle Triassic)

Marco Franceschi, Nereo Preto, Marcello Caggiati, Giovanni Gattolin, Alberto Riva and Piero Gianolla
Drowning of microbial mounds on the slopes of the Latemar Platform (Middle Triassic)
Italian Journal of Geosciences (February 2020) 139 (1): 98-108

Abstract

Two microbial mound-shaped carbonate bodies buried below the slope deposits of the middle Triassic Latemar platform (Dolomites, Italy) was studied. The two sedimentary bodies, after having reached different stages of evolution, drowned and were covered by the slopes of the Latemar carbonate platform. The estimation of the depth and time at which they were located when they were buried made it possible to infer the average rates of relative sea-level rise to which they were subjected, revealing that such rates exceeded the growth rate of the main Latemar buildup. Given the estimated rates of sea-level rise, the two satellite bodies reached a critical depth at which microbial carbonate production stops, or it is significantly reduced, before being buried. As extensional tectonics was active in the area of the Dolomites during the Anisian, subsidence is the more likely cause of sea level rise. It is therefore hypothesized that the cause of the ultimate drowning of the "mounds" were subsidence rates exceeding their aggradation potential and inducing a progressive deepening that brought them below the lower depth threshold of microbial carbonate production.


ISSN: 2038-1719
EISSN: 2038-1727
Coden: BOGIAT
Serial Title: Italian Journal of Geosciences
Serial Volume: 139
Serial Issue: 1
Title: Drowning of microbial mounds on the slopes of the Latemar Platform (Middle Triassic)
Affiliation: University of Padua, Department of Geosciences, Padua, Italy
Pages: 98-108
Published: 202002
Text Language: English
Publisher: Societa Geologica Italiana, Rome, Italy
References: 63
Accession Number: 2020-030415
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., geol. sketch map
N46°22'60" - N46°22'60", E11°34'60" - E11°34'60"
Secondary Affiliation: University of Ferrara, ITA, Italy
Country of Publication: Italy
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Abstract, Copyright, Societa Geologica Italiana. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2020
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