Recent sedimentary facies of isolated carbonate platforms, Belize-Yucatan system, Central America

1999 ◽  
Vol 69 (3) ◽  
pp. 747-763 ◽  
Author(s):  
E. Gischler ◽  
A. J. Lomando
Keyword(s):  
Central America ◽  
Sedimentary Facies ◽  
Carbonate Platforms

Diversity and systematics of Middle-Late Ordovician calcified cyanobacteria and associated microfossils from Ordos Basin, North China

2020 ◽  
Vol 95 (1) ◽  
pp. 1-23
Author(s):  
Lijing Liu ◽  
Yasheng Wu ◽  
Hongping Bao ◽  
Hongxia Jiang ◽  
Lijing Zheng ◽  
...  
Keyword(s):  
North China ◽  
Benthic Communities ◽  
Ordos Basin ◽  
Sedimentary Facies ◽  
Late Ordovician ◽  
Carbonate Platforms ◽  
North China Block ◽  
Thin Sections ◽  
Open Platform ◽  
First Time

AbstractCalcified cyanobacteria are of considerable research value for reconstructing the ecology of Paleozoic and Mesozoic benthic communities on carbonate platforms due to their ability to produce oxygen and fix nitrogen and CO2. The diversity and abundance of calcified cyanobacteria was initially suggested to have declined in the Middle and Late Ordovician, although more recent work suggests that complex and diverse assemblages persisted throughout the Ordovician. Here, calcified cyanobacteria and associated microfossil flora from the Middle and Late Ordovician of the Ordos Basin, North China Block, are systematically described for the first time based on 1330 thin sections from seven outcrop profiles and four drill cores. In total, there are 18 species belonging to 16 genera, including a new species, Proaulopora ordosia n. sp. Girvanella, Subtifloria, Acuasiphonoria, Xianella, and Oscillatoriaceae gen. indet. are assigned to Osillatoriales of cyanobacteria; Ortonella, Hedstroemia, Cayeuxia, Zonotrichites, Proaulopora, and Phacelophyton are assigned to Nostocales of cyanobacteria; and Garwoodia, Renalcis, Izhella, Rothpletzella, and Wetheredella are assigned to calcified Microproblematica. A literature survey of Ordovician microfloral assemblages shows that cyanobacteria and associated microfossils occur in reef, open platform, lagoon, and tidal facies. Most genera occur on at least two independent blocks, and many have a cosmopolitan distribution in similar sedimentary facies. Our research suggests that calcified cyanobacteria and associated microfossils formed complex ecosystems and played greater ecological roles on carbonate platforms during the late Middle and Late Ordovician than was previously thought.UUID: http://zoobank.org/1812ccf8-136c-4cff-92ba-faeaf06523ef

Holocene development of three isolated carbonate platforms, Belize, Central America

1998 ◽  
Vol 144 (4) ◽  
pp. 333-347 ◽  
Author(s):  
Eberhard Gischler ◽  
J.Harold Hudson
Keyword(s):  
Central America ◽  
Carbonate Platforms

The origin of carbonate mud in isolated carbonate platforms of Belize, Central America

2002 ◽  
Vol 91 (6) ◽  
pp. 1054-1070 ◽  
Author(s):  
Eberhard Gischler ◽  
Daniel Zingeler
Keyword(s):  
Central America ◽  
Carbonate Platforms

Benthic foraminiferal zonation in deep-water carbonate platform margin environments, northern Little Bahama Bank

1988 ◽  
Vol 62 (01) ◽  
pp. 1-8 ◽  
Author(s):  
Ronald E. Martin
Keyword(s):  
Deep Water ◽  
Benthic Foraminifera ◽  
Carbonate Platform ◽  
Sedimentary Facies ◽  
Depositional Environments ◽  
Near Surface ◽  
Sediment Gravity Flows ◽  
Gravity Flows ◽  
Platform Margin ◽  
Water Carbonate

The utility of benthic foraminifera in bathymetric interpretation of clastic depositional environments is well established. In contrast, bathymetric distribution of benthic foraminifera in deep-water carbonate environments has been largely neglected. Approximately 260 species and morphotypes of benthic foraminifera were identified from 12 piston core tops and grab samples collected along two traverses 25 km apart across the northern windward margin of Little Bahama Bank at depths of 275-1,135 m. Certain species and operational taxonomic groups of benthic foraminifera correspond to major near-surface sedimentary facies of the windward margin of Little Bahama Bank and serve as reliable depth indicators. Globocassidulina subglobosa, Cibicides rugosus, and Cibicides wuellerstorfi are all reliable depth indicators, being most abundant at depths >1,000 m, and are found in lower slope periplatform aprons, which are primarily comprised of sediment gravity flows. Reef-dwelling peneroplids and soritids (suborder Miliolina) and rotaliines (suborder Rotaliina) are most abundant at depths <300 m, reflecting downslope bottom transport in proximity to bank-margin reefs. Small miliolines, rosalinids, and discorbids are abundant in periplatform ooze at depths <300 m and are winnowed from the carbonate platform. Increased variation in assemblage diversity below 900 m reflects mixing of shallow- and deep-water species by sediment gravity flows.

Sign in / Sign up

Export Citation Format

Share Document