Nutrient and temperature controls on modern carbonate production: An example from the Gulf of California, Mexico

Halfar, Jochen; Godínez-Orta, Lucio; Mutti, Maria; Valdez-Holguín, José Eduardo; Borges, J. M.

doi:10.1130/g20298.1

Cited by 136 publications

(104 citation statements)

References 9 publications

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“…A similar assemblage was reported from the inner ramp of the Miocene sediments of the Central Apennines (Corda and Brandano, 2003) and from the Early Oligocene deposits of the Lower Inn Valley (Nebelsick et al, 2001). The abundance of larger benthic foraminifera (Borelis, Peneroplis, Dendritina, Heterostegina, Operculina) and zooxanthellate corals indicate mesophothic to euphotic condition (Halfar et al, 2004;Pomar et al, 2004;Pomar and Hallock, 2008;Brandano et al, 2009b;Mazzucchi and Tomassetti, 2011;Tomassetti and Brandano, 2013). During the Burdigalian a slightly restricted lagoon became established over the entire width of the platform in the SW (e.g.…”

Section: Burdigalianmentioning

confidence: 72%

“…The symbiont bearing larger foraminifera are known to thrive in tropical waters (Langer and Hottinger, 2000). According to Heydari (2008) (Langer and Hottinger, 2000;Halfar et al, 2004;Pomar et al, 2004;Bassi and Nebelsick, 2010). Oligotrophic to mesotrophic conditions in the inner ramp setting (Chattian-Burdigalian) lead to the occurrence of larger imperforate foraminifera such as Archaias, Borelis, Peneroplis and Austrotrillina.…”

Section: Discussionmentioning

confidence: 99%

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Biostratigraphy and paleoecology of the Oligo-Miocene Asmari Formation in the Izeh zone (Zagros Basin, SW Iran)

Taheri

Vaziri-Mogaddam

Taheri

et al. 2017

BSGM

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RESUMEN ABSTRACTIn this study, biostratigraphy and paleoecology of the Asmari Formation have been investigated. The study area is located in the Izeh zone, Zagros Basin. Four outcrop sections (Halayjan, Kuh Shur, Kuh-e Bad and Gharibi Ha) have been sampled. Based on distribution of the larger benthic and planktonic foraminifera, five assemblage zones have been recognized. Assemblages 1 and 2 indicate Chattian; assemblage 3 is restricted to Aquitanian and assemblages 4 and 5 suggest Burdigalian. During the Chattian, the carbonate deposits of the Asmari Formation are mostly composed of coralline red algae and large and flat benthic foraminifera. The common components of the Aquitanian are abundant imperforate foraminifera and Favreina asmaricus. The Burdigalian is characterized by coral, coralline algae, and perforate and imperforate foraminifera. During the Burdigalian toward the SE of study area (Gharibi Ha section), the shallow water deposits are abruptly overlain by pelagic limestone. It is interpreted as the result of a regional tilting that started in the upper part of the Burdigalian. The biotic associations suggest that carbonate sedimentation occurred in tropical to subtropical waters under oligotrophic to mesotrophic conditions. The carbonate grain associations in the Asmari Formation suggest heterozoan association. According to paleoecological parameters (such as: nutrient, depth, light and salinity) in the study area, the Asmari Formation belongs to nannofor-foralgal to foramol association which were deposited in slightly hyper to normal saline environment. In the euphotic zone, abundant imperforate foraminifera are present. Basinward, lens shaped rotalids developed in mesophotic conditions, and large lepidocyclinid-nummulitids characterize the sediments of the deeper oligophotic zone.Keywords: Asmari Formation, Oligocene-Miocene, biostratigraphy, paleoecology, larger benthic foraminifera, Zagros Basin.

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Section: Burdigalianmentioning

confidence: 72%

Section: Discussionmentioning

confidence: 99%

Biostratigraphy and paleoecology of the Oligo-Miocene Asmari Formation in the Izeh zone (Zagros Basin, SW Iran)

Taheri

Vaziri-Mogaddam

Taheri

et al. 2017

BSGM

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“…n = nummulitid, br = bryozoan colony, ra = red alga. accordance with Halfar et al (2004), the bryozoan beds recorded in northern Italy would thus correspond to a cold-water heterozoan association (sensu James, 1997).…”

Section: Change In Carbonate Factorymentioning

confidence: 99%

“…While in modern environments phototrophs such as scleractinian corals and larger foraminifera are found in waters with winter surface temperatures above 20°C (James, 1997), bryozoan-bearing heterotrophic communities dominate in cool waters (b 20°C) or in warm settings below the photic zone. Besides water temperature and light penetration, nutrients have an important influence on biotic carbonate production (Hallock and Schlager, 1986;Hallock, 2001;Pomar, 2001;Brandano and Corda, 2002;Mutti and Hallock, 2003;Halfar et al, 2004). While phototrophs, with the exception of red algae, need oligotrophic to slightly mesotrophic conditions to thrive, heterotrophic carbonate producers dominate in nutrient-rich settings (Hallock and Schlager, 1986;Hallock, 2001;Mutti and Hallock, 2003;Halfar et al, 2004Halfar et al, , 2006Wilson and Vecsei, 2005;Westphal et al, 2010).…”

Section: Change In Carbonate Factorymentioning

confidence: 99%

“…Such an analysis was not possible in the thin-sections examined due to the indurated nature of the calcareous material and the fragmented appearance of the bryozoan colonies preserved. However, based on observations in the modern Gulf of California, Halfar et al (2004) concluded that heterozoan-dominated carbonates deposited in high-nutrient and high-temperature environments can be differentiated from heterozoan carbonates deposited in low-temperature settings because they contain 1 to 20% photozoan constituents, while true cold-water heterozoan associations contain less than 1% of photozoan organisms, irrespective of nutrient concentration. The middle part of the bryozoan beds in San Valentino consists of 100% heterotrophic organisms with up to 86% bryozoans (Figs.…”

Section: Change In Carbonate Factorymentioning

confidence: 99%

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Bryozoan beds in northern Italy as a shallow-water expression of environmental changes during the Oligocene isotope event 1

Jaramillo‐Vogel

Bover‐Arnal

Strasser

2016

Sedimentary Geology

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Shifts in carbonate-producing biotic communities in the geological record provide evidence of past environmental changes in the neritic realm. The shallow-marine Calcare di Nago Formation exposed in the San Valentino section (northern Italy) covers the Late Eocene and Earliest Oligocene. The succession is characterized by the occurrence of light-dependent biota such as coralline algae and larger benthic foraminifera. In the uppermost part of the section, however,\ the fossil association is dominated by bryozoans, which are filter-feeder organisms. This ca. 12 m thick interval locally contains up to 86% bryozoans, while coralline algae as well as larger benthic foraminifera are absent. Coralline algae and nummulitid foraminifera recover in the upper part of the bryozoan beds, whereas orthophragminids do not recover. The gradual disappearance of larger foraminifera and coralline algae within the bryozoan-dominated deposits is coeval with a pronounced positive shift in δ 13 C. Based on its biostratigraphic position, this positive shift is interpreted to be linked to the positive shift in δ 13 C recognized in deepsea records shortly above the Eocene-Oligocene boundary, which in turn is associated to the positive shift in δ 18 O leading to the Oi-1 (Oligocene isotope event 1) cooling phase. Total phosphorus content increases in the bryozoan beds, suggesting enhanced nutrient supply to the neritic ecosystem. This phosphorous peak is coeval with the globally recognized increment in ocean productivity around the Oi-1 and δ 13 C positive shift. Thus, disappearance of light-dependent biota and the dominance of bryozoans in the platform carbonates studied are interpreted to result not necessarily from a deepening of the depositional environment but from the combination of lower seasurface temperatures and the deterioration of underwater light conditions on account of elevated turbidity in surface waters, resulting from enhanced primary productivity. As bryozoan beds occur in several Italian localities around the Eocene-Oligocene boundary, they are interpreted to represent the regional expression of neritic carbonate depositional systems to global environmental changes occurring at the dawn of an ice-house Earth.

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Carbonate Grain Associations: their Use and Environmental Significance, a Brief Review

Kindler¹,

Wilson

2012

Carbonate Systems During the Oligocene–Miocene Climatic Transition

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Nutrient and temperature controls on modern carbonate production: An example from the Gulf of California, Mexico

Cited by 136 publications

References 9 publications

Biostratigraphy and paleoecology of the Oligo-Miocene Asmari Formation in the Izeh zone (Zagros Basin, SW Iran)

Biostratigraphy and paleoecology of the Oligo-Miocene Asmari Formation in the Izeh zone (Zagros Basin, SW Iran)

Bryozoan beds in northern Italy as a shallow-water expression of environmental changes during the Oligocene isotope event 1

Carbonate Grain Associations: their Use and Environmental Significance, a Brief Review

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