The Icaiche Formation: Unacknowledged Contributor to Yucatán Hydrogeology and Geomorphology

Perry, Eugene C.; Leal‐Bautista, Rosa María; Velazquez-Oliman, Guadalupe; Wagner, Niklas

doi:10.1130/abs/2018am-318747

Geological Society of America Abstracts With Programs

2018

DOI: 10.1130/abs/2018am-318747

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The Icaiche Formation: Unacknowledged Contributor to Yucatán Hydrogeology and Geomorphology

Eugene C. Perry¹,

Rosa María Leal‐Bautista²,

Guadalupe Velazquez-Oliman³

et al.

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“…An increase in the concentrations of sulfate and calcium ions with respect to depth in TJBH was noticed, which could be due to the dissolution of gypsum that results in high levels of both ions (Figure 6C). This result coincides with reported dissolved and mineralized gypsum contents in groundwater (almost saturated in sulfates) in the southeast portion of the Yucatań Peninsula and northeastern Belize (Perry et al, 2002;Perry et al, 2019;Perry et al, 2021). Increasing ionic concentrations, for Na + , Cl -, as a function of the water depth were also noticed, coinciding with the increase on salinity.…”

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confidence: 90%

First insights into an exceptionally deep blue hole in the Western Caribbean: The Taam ja’ Blue Hole

Alcérreca‐Huerta

Álvarez-Legorreta²,

Carrillo³

et al. 2023

Front. Mar. Sci.

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Coastal karst formations may remain unexplored by the global marine scientific research community. Knowledge provided by fishermen coupled with scientific research on karstic formations prompted us to explore the geomorphometric and physicochemical features of a submerged blue hole in the large tropical estuary of Chetumal Bay in the southeastern coast of the Yucatán Peninsula, Mexico. Differently from the well-known literature on cenotes in the Yucatán Peninsula, no references are made to blue holes in the region. Sampling and surveying of the blue hole were conducted in September 2021 by scuba, echosounders, CTD profilers, and the collection of water samples. This study revealed a previously unknown maximum water depth for the Taam ja’ Blue Hole, as it is now named, of 274.4 meters below sea level (mbsl), making it the second deepest known blue hole in the world. The Taam ja’ Blue Hole has a nearly circular shape at its surface, encompassing an area of ~13,690 m2. The sides of the blue hole are steep, with slopes >80° that form a large conic structure covered by biofilms, sediments, limestone, and gypsum ledges. The blue hole mouth locates at ~4.5-5.0 mbsl, at which water properties change significantly with temperature and salinity gradients of 4.9°C/m and 9.8 PSU/m, respectively. Hydrographic profiles show a stratified water column inside the blue hole consisting of a hypoxic layer (5-20 mbsl), a chemocline (50-80 mbsl), and an anoxic layer (>110 mbsl). Evaluation of anions and cations indicated that the water inside corresponds mainly to that of diluted seawater.

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supporting

confidence: 90%

First insights into an exceptionally deep blue hole in the Western Caribbean: The Taam ja’ Blue Hole

Alcérreca‐Huerta

Álvarez-Legorreta²,

Carrillo³

et al. 2023

Front. Mar. Sci.

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Microbialites show a distinct cyanobacterial phylogenetic structure and functional redundancy in Bacalar lagoon and Cenote Azul sinkhole, Yucatan Peninsula, Mexico

Águila

Yanez-Montalvo

Mercado-Juárez

et al. 2022

FEMS Microbiology Ecology

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Cyanobacterial components of microbialites from two geographically close systems, the Bacalar lagoon (BL) and the Cenote Azul sinkhole (CA) in Quintana Roo, Mexico, were characterized. BL and CA systems were studied along a longitudinal gradient (north to south) and a depth gradient (5 to 30 m), respectively. Microscopic observations, 16S rRNA amplicon sequencing, and shotgun metagenomics were used to characterize Cyanobacteria. Both systems showed similar metabolic/functional profiles but harbored completely different cyanobacterial taxa. BL was dominated by Nostocales, including a population of previously undescribed Chakia sp., while CA was dominated by an unknown taxon of Chroococcales, comprising 70% of relative abundance through all depths. Interestingly, cyanobacterial assemblages in microbialites exhibited phylogenetic overdispersion in most of the BL sites, while CA sites exhibited phylogenetic clustering, these differences were attributed to depth/light conditions and possibly different times of geological formation for BL and CA systems.

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The Icaiche Formation: Unacknowledged Contributor to Yucatán Hydrogeology and Geomorphology

Cited by 2 publications

References 0 publications

First insights into an exceptionally deep blue hole in the Western Caribbean: The Taam ja’ Blue Hole

First insights into an exceptionally deep blue hole in the Western Caribbean: The Taam ja’ Blue Hole

Microbialites show a distinct cyanobacterial phylogenetic structure and functional redundancy in Bacalar lagoon and Cenote Azul sinkhole, Yucatan Peninsula, Mexico

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