Coral–algal and Foraminifera Phase Shifts in the Eocene Foralgal Reef at Iodp Site U1376 (Unit Iia): Ecological and Environmental Aspects

Khameiss, Belkasim; Fluegeman, Richard H.; Muftah, Ahmed M.; Grigsby, Jeffry D.; Malone, Shawn J.

doi:10.1130/abs/2018am-317600

Cited by 1 publication

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“…Fourteen facies have been recognized in the Burton Guyot Limestone Unit AII according to their lithologic characters (composition) and fossils assemblage (organization) in forms of benthic and planktic foraminifers, as well as the observed coral growth forms. This reef formed during the late Paleocene to the Eocene, with reef-building dominated by corals rather than algae because of raising the sea level associated with tectonic activity at this time [8,10,14] . The coral and algae-reef builders, are sensitive to paleoenvironmental conditions, and changes in their proportions over time allow for investigation of environmental change in the Paleogene [7,8,9,14] .…”

Section: Resultsmentioning

confidence: 99%

“…This reef formed during the late Paleocene to the Eocene, with reef-building dominated by corals rather than algae because of raising the sea level associated with tectonic activity at this time [8,10,14] . The coral and algae-reef builders, are sensitive to paleoenvironmental conditions, and changes in their proportions over time allow for investigation of environmental change in the Paleogene [7,8,9,14] .…”

Section: Resultsmentioning

confidence: 99%

“…The reported microfauna includes several benthic and planktonic foraminifers and ostracod species. The age of this unit was determined by the appearance of some diagnostic foraminifera in these samples [7,8,9,12] . The age of this algal reef is Middle Eocene.…”

Section: Biofacies Unitsmentioning

confidence: 99%

“…The limestone Unit (Algal reef unit) occurs between two basalt flows. The algal limestone unit is Middle Eocene in age based on fossils in this reef [7,8,9,10,11] . Chain [8,9] .…”

Section: Introductionmentioning

confidence: 99%

“…The algal limestone unit is Middle Eocene in age based on fossils in this reef [7,8,9,10,11] . Chain [8,9] .…”

Section: Introductionmentioning

confidence: 99%

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Using Biofacies Analysis of a Tertiary Algal Reef (Pinnacle Reef - Middle Eocene IIA), at Burton Guyot (IODP Site U1376) to Determine Transition from Greenhouse to Icehouse

Khameiss,

Fluegeman,

Hoyt

2023

sjuob

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Twenty-five samples were collected at 30 cm intervals from the studied cored interval within the limestone unit (AII) reported at IODP Site U1376 on Burton Guyot. The purpose of this research is to examine and identify the coral and algae suites in the studied core concerning sea level fluctuation during the Eocene time. This reef is isolated by being between two volcanic units in the Southwest Pacific Ocean. Eleven biofacies units have been established based on the fabric of the grains. The biofacies units are as follows; Algal-coral grainstone, foraminiferal algal-coral grainstone (Alabaminabed), foraminiferal algal-coral packstone to grainstone (Heterostegina bed), algal-coral grainstone, foraminiferal algal boundstone, foraminiferal algal grainstone (Lagena bed), foraminiferal algal grainstone (Cibicidoides micrus-bed), foraminiferal algal boundstone to grainstone, foraminiferal algal-coral grainstone, algal echionoidal packstone, and foraminiferal algal coral wacke-packstone. This is the first study to use both algae and coral in differentiating the units mentioned above. The only coralline red algae recognized in the samples is Lithothamnion camarasae. This species is a good indicator of the warm climatic conditions during the middle-late Eocene. The only species of coral found in these units is Isopora togianensis, a scleractinian reef builder. The high percentage of algae compared to coral indicates a climatic change from a greenhouse to an icehouse climate. The faunal trend during this time also indicates a tectonic change.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Biofacies Unitsmentioning

confidence: 99%

“…The limestone Unit (Algal reef unit) occurs between two basalt flows. The algal limestone unit is Middle Eocene in age based on fossils in this reef [7,8,9,10,11] . Chain [8,9] .…”

Section: Introductionmentioning

confidence: 99%

“…The algal limestone unit is Middle Eocene in age based on fossils in this reef [7,8,9,10,11] . Chain [8,9] .…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Using Biofacies Analysis of a Tertiary Algal Reef (Pinnacle Reef - Middle Eocene IIA), at Burton Guyot (IODP Site U1376) to Determine Transition from Greenhouse to Icehouse

Khameiss,

Fluegeman,

Hoyt

2023

sjuob

View full text Add to dashboard Cite

show abstract

Coral–algal and Foraminifera Phase Shifts in the Eocene Foralgal Reef at Iodp Site U1376 (Unit Iia): Ecological and Environmental Aspects

Cited by 1 publication

References 0 publications

Using Biofacies Analysis of a Tertiary Algal Reef (Pinnacle Reef - Middle Eocene IIA), at Burton Guyot (IODP Site U1376) to Determine Transition from Greenhouse to Icehouse

Using Biofacies Analysis of a Tertiary Algal Reef (Pinnacle Reef - Middle Eocene IIA), at Burton Guyot (IODP Site U1376) to Determine Transition from Greenhouse to Icehouse

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