Turpin, Melanie et al. (2012): Geochemical and petrographical characterization of fine-grained carbonate particles along proximal to distal transects

Leg/Site/Hole:
ODP 166
ODP 166 1003
ODP 166 1005
ODP 166 1006
ODP 166 1007
Identifier:
2013-013755
georefid

10.1016/j.sedgeo.2012.06.008
doi

Creator:
Turpin, Melanie
Universite Pierre et Marie Curie VI, Laboratoire Biomineralisations et Environnements sedimentaires, Paris, France
author

Emmanuel, Laurent
Ruhr-University Bochum, Germany
author

Immenhauser, Adrian
author

Renard, Maurice
author

Identification:
Geochemical and petrographical characterization of fine-grained carbonate particles along proximal to distal transects
2012
Sedimentary Geology
Elsevier, Amsterdam, Netherlands
281
1-20
The origin of carbonate ooze particles is often poorly understood. This is due to their polygenic origin and potential post-depositional alteration. Here, the outcome of a physical separation study with regard to different component classes of micritic carbonates is shown. The focus is on grain size and morphology, mineralogy and isotope signatures. Two contrasting proximal-to-distal transects were investigated: (1) the Miocene leeward margin of Great Bahama Bank (ODP Leg 166) and (2) the transition between the Maiella platform and the Umbria-Marche basin in central Italy near the Cenomanian-Turonian boundary. In both case settings, carbonate particles of biogenic origin include at least three groups of organisms: (i) planktonic foraminifera, (ii) calcareous nannofossils and (iii) fragments of unspecified neritic skeletal material. Two further particle types lack diagnostic structures, and based on particle size and mineralogy, are here referred to as (iv) macroparticles (5-20mu m, mainly xenomorphic) and (v) microparticles (<12mu m, mainly automorphic to sub-automorphic). Macro- and microparticles represent 50 to 80% of the carbonate phase in slope and toe-of-slope domains and share characteristic carbon and oxygen isotope signatures. Macro- and microparticles are considered shallow-water precipitation products subsequently exported into the slope and toe-of-slope domains. Macroparticles are probably related to the fragmentation of neritic skeletal components while microparticles point to inorganic and/or bioinduced precipitation in the water column. In some cases, macro- and microparticles may have an early diagenetic origin. The identification of the origin of fine-grained particles allows for a quantitative assessment of exported, in situ and diagenetic carbonate materials in periplatform environments. The data shown here represent an important step towards a more complete characterization of carbonate ooze and micrite. Abstract Copyright (2012) Elsevier, B.V.
English
Serial
Coverage:Geographic coordinates:
North:43.4000
West:-79.2500East: 14.1000
South:24.1500

Sedimentary petrology; Geochemistry of rocks, soils, and sediments; Abruzzi Italy; algae; Anomalinidae; aragonite; Atlantic Ocean; Bahamas; C-13/C-12; calcareous composition; calcite; Campania Italy; carbon; carbonate platforms; carbonate rocks; carbonate sediments; carbonates; Caribbean region; Cassidulinacea; Cenomanian; Cenozoic; central Italy; Cibicidoides; clastic sediments; Coccolithophoraceae; Contessa Italy; cores; Cretaceous; depositional environment; Discoasteridae; dolomite; DTA data; Europe; Fiori Mountain; Foligno Italy; Foraminifera; Fosso del Presale; Furlo Italy; Globigerinacea; Globigerinidae; Globigerinoides; granulometry; Great Bahama Bank; Invertebrata; isotope ratios; isotopes; Italy; Leg 166; limestone; Maiella Mountains; marine sediments; Mesozoic; micrite; microfossils; microscope methods; mineral composition; Miocene; nannofossils; Neogene; North Atlantic; Northwest Atlantic; O-18/O-16; Ocean Drilling Program; ODP Site 1003; ODP Site 1005; ODP Site 1006; ODP Site 1007; ooze; optical spectra; Orbulina; oxygen; particles; Pennapiedimonte Italy; petrography; planktonic taxa; Plantae; Protista; Rotaliina; sedimentary rocks; sediments; SEM data; Southern Europe; spectra; stable isotopes; Straits of Florida; Tertiary; TGA data; Turonian; Umbria Italy; Upper Cretaceous; West Indies; X-ray diffraction data;

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