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آخرین ارسال های انجمن
GEOSOFT بازدید : 1029 جمعه 22 دی 1391 نظرات (0)
نانوپلانکتون های آهکی

Calcareous Nannofossils

نانوپلانکتون هاى آهکى، پروتيست هاى فتوسنتزى تک سلولى از اعضاى گروه Haptophyta (هاپتوفيتا) مى باشند. آنها داراى اشکال بسيار متفاوتى هستند، ولى همگى پوسته هايى متشکل از ورقه هاى ظريف از کربنات کلسيم بنام کوکوليت ها دارند. اين پلانکتون هاى ظريف اکثراً در محيط هاى دريايى گرمسيرى ديده مى شوند، وتوليد کننده هاى اوليه مهمى هستند. بعد از اينکه ارگانيسم ها مى ميرند، کوکوليت هاى آنها در ته اقيانوس جمع مى شوند، و لجن هاى آهکى را تشکيل مى دهند که با گچ ها و ساير سنگ آهک هاى دانه ريز سفت و سخت مى شوند. فسيل هاى نانوپلانکتون آهکى در سنگ آهک ها ى ژوراسيک ديده شده اند.


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Images
The following images are of a representative selection of calcareous nannofossils aimed at giving a general overview of the different morphotypes. Each specimen is given a generic and if possible a species name followed by its age range, the site location from which the sample was obtained and the magnification at which the image was taken or its size in microns. PC (Phase Contrast), XPL (Crossed Polarised Light) SEM (Scanning Electron Microscope). Typical and selected marker species are illustrated from each main period of the geological column in which calcareous nannofossils occur. Click on an image to view a larger version.
Triassic and Jurassic
Anulasphaera helvetica Grun and Zweili, 1980
Callovian (Middle Jurassic)
Denver Borehole, UK
PC side view
Anulasphaera helvetica Grun and Zweili, 1980
Callovian (Middle Jurassic)
Denver Borehole, UK
XPL side view
Anulasphaera helvetica Grun and Zweili, 1980
Callovian (Middle Jurassic)
Denver Borehole, UK
(SEM) distal view
Anulasphaera helvetica Grun and Zweili, 1980
Callovian (Middle Jurassic)
Denver Borehole, UK
(SEM) proximal oblique view
Stephanolithion bigotii bigotii Deflandre, 1939
Lower Oxfordian (Upper Jurassic)
Cleveland Farm Pit, wiltshire, UK
XPL
Stephanolithion bigotii bigotii Deflandre, 1939
Upper Kimmeridgian (Upper Jurassic)
Gorodische, Russia
SEM
Stephanolithion speciosum octum Deflandre in Deflandre and Fert, 1954 ssp. Rood and Barnard, 1972
Lower Bathonian (Middle Jurassic)
Port en Bessin, N. France
XPL
Stephanolithion speciosum octum Deflandre in Deflandre and Fert, 1954 ssp. Rood and Barnard, 1972
Lower Bathonian (Middle Jurassic)
Port en Bessin, N. France
PC
Stephanolithion speciosum Deflandre in Deflandre and Fert, 1954 ssp. octum Rood and Barnard, 1972
Upper Bajocian-Lower Callovian (Middle Jurassic)
Escoville, France
distal view
Biscutum novum (Goy,1979) Bown, 1987
Aalenian/Bajocian
Brenha, Portugal
XPL
Biscutum novum (Goy,1979) Bown, 1987
Lower Toarcian
Trimeusel, Germany
distal view
Biscutum novum (Goy,1979) Bown, 1987
Upper Toarcian
Ballrechten, Germany
proximal view
Carinolithus superbus (Deflandre in Deflandre and Fert, 1954) Prins in Grun et al, 1974
Lower Toarcian-Lower Bajocian
Ilminster, UK
proximal oblique view SEM
Carinolithus superbus (Deflandre in Deflandre and Fert, 1954) Prins in Grun et al, 1974
Lower Toarcian-Lower Bajocian
Ilminster, UK
side view SEM
Crucirhabdus minutus Jafar, 1983
Norian-Rhaetian (Upper Triassic)
Fischerwiese, Austria
XPL distal view
Crucirhabdus minutus Jafar, 1983
Norian-Rhaetian (Upper Triassic)
Weissloferbach, S. Germany
distal view SEM
Lotharingius haufii Grun and Zweili in Grun et al, 1974
Lower Toarcian
Untersturmig, Germany
XPL
Lotharingius haufii Grun and Zweili in Grun et al, 1974
Upper Pliensbachian-Upper Bathonian
Untersturmig, Germany
PC
Lotharingius haufii Grun and Zweili in Grun et al, 1974
Upper Pliensbachian-Upper Bathonian
Untersturmig, Germany
SEM (collapsed coccosphere)
Parhabdolithus liasicus distinctus Deflandre in Grasse, 1952 ssp. Bown, 1987
Hettangian-Lower Toarcian
Timor
XPL plan view
Parhabdolithus liasicus distinctus Deflandre in Grasse, 1952 ssp. Bown, 1987
Hettangian-Lower Toarcian
Timor
XPL side view
Parhabdolithus liasicus distinctus Deflandre in Grasse, 1952 ssp. Bown, 1987
Hettangian-Lower Toarcian
Mochras Borehole, UK
side view (SEM)
Prinsiosphaera triassica Jafar, 1983
Norian-Rhaetian
Weissloferbach S. Germany
XPL
Prinsiosphaera triassica Jafar, 1983
Norian-Rhaetian
ODP Site 761, Wombat Plateau, NW Australian shelf
SEM
Lower Cretaceous
Axopodorhabdus albianus (Black, 1967) Wind and Wise in Wise and Wind, 1977
Middle Albian-Upper Cenomanian
Folkestone, UK
XPL
Axopodorhabdus albianus (Black, 1967) Wind and Wise in Wise and Wind, 1977
Middle Albian-Upper Cenomanian
English Channel Borehole R330, UK
distal view SEM
Calcicalathina oblongata (Worsley, 1971) Thierstein, 1971
Lower Valanginian-Lower Barremian
Bulgaria
XPL distal view
Calcicalathina oblongata (Worsley, 1971) Thierstein, 1971
Lower Valanginian-Lower Barremian
DSDP Site 547B, Atlantic Ocean
distal view SEM
Calcicalathina oblongata (Worsley, 1971) Thierstein, 1971
Lower Valanginian-Lower Barremian
DSDP Site 547B, Atlantic Ocean
side view SEM
Ceratolithina bicornuta Perch-Nielsen, 1988
Middle Albian-Upper Albian
Folkestone, UK
XPL
Corollithion kennedyi
Cenomanian
Lydden Spout, Folkestone, UK
XPL
Cruciellipsis cuvillieri (Manivit, 1966) Thierstein, 1971
Lower Berriasian-Upper Hauterivian
DSDP Site 397, E.Atlantic Ocean
XPL
Cruciellipsis cuvillieri (Manivit, 1966) Thierstein, 1971
Lower Berriasian-Upper Hauterivian
DSDP Site 547B, Atlantic Ocean
distal view SEM
Eiffellithus turriseiffelii (Deflandre in Deflandre and Fert, 1954) Reinhardt, 1965
Upper ALbian-Upper Maastrichtian
Folkestone, UK
XPL distal view
Eprolithus floralis (Stradner, 1962) Stover, 1966
Lower Aptian-?Lower Campanian
Folkestone, UK
XPL distal view
Gartnerago segmentatum
Cenomanian-Maastrichtian
Langdon Stairs, Dover, Kent, UK
XPL distal view
Micrantholithus obtusus Stradner, 1963
Berriasian-Upper Aptian
Speeton, UK
XPL
Micrantholithus obtusus Stradner, 1963
Berriasian-Upper Aptian
DSDP Site 398D, Atlantic Ocean
SEM
Nannoconus abundans Stradner and Grun, 1973
Barremian-?Lower Aptian
Speeton, UK
XPL
Nannoconus abundans Stradner and Grun, 1973
Barremian-?Lower Aptian
Speeton, UK
side view SEM
Prediscosphaera columnata (Stover, 1966) Perch-Nielsen, 1984
Lower Albian-Turonian
Folkestone, UK
XPL distal view
Prediscosphaera columnata (Stover, 1966) Perch-Nielsen, 1984
Lower Albian-Turonian
Folkestone, UK
XPL side view
Prediscosphaera columnata (Stover, 1966) Perch-Nielsen, 1984
Lower Albian-Turonian
Copt Point, UK
side view SEM
Watznaueria barnesae (Black in Black and Barnes, 1959) Perch-Nielsen, 1968
Lower Bajocian-Maastrichtian
Gorodische, Russia
XPL
Watznaueria barnesae (Black in Black and Barnes, 1959) Perch-Nielsen, 1968
Lower Bajocian-Maastrichtian
Speeton, UK
SEM (Coccosphere)
Watznaueria britannica (Stradner, 1963) Reinhardt, 1964
Lower Bajocian-Lower Cenomanian
Cleveland Farm Pit, Wiltshire, UK
XPL
Zeugrhabdotus erectus (Deflandre in Deflandre and Fert, 1954) Reinhardt, 1965
Lower Pliensbachian?-Upper Maastrichtian
Cleveland Farm Pit, Wiltshire, UK
XPL
Zeugrhabdotus erectus (Deflandre in Deflandre and Fert, 1954) Reinhardt, 1965
Lower Pliensbachian?-Upper Maastrichtian
Mochras Borehole, UK
distal view SEM
Zeugrhabdotus erectus (Deflandre in Deflandre and Fert, 1954) Reinhardt, 1965
Lower Pliensbachian?-Upper Maastrichtian
Dorset, UK
side view SEM
Upper Cretaceous
Arkhangelskiella cymbiformis Vekshina, 1959
Campanian-Maastrichtian
DSDP Site 249, Indian Ocean
XPL distal view
Arkhangelskiella cymbiformis Vekshina, 1959
Campanian-Maastrichtian
Keswick, Norfolk, UK
oblique distal view SEM
Eiffellithus eximius (Stover, 1966) Perch-Nielsen, 1968
Turonian-Campanian
Zoe C BH, South Africa
XPL
Eiffellithus eximius (Stover, 1966) Perch-Nielsen, 1968
Turonian-Campanian
Zoe C BH, South Africa
XPL rotated
Lithastrinus grillii Stradner, 1962
Coniacian-Campanian
near Plymouth Bluff, Lowndes County, Mississippi, USA
XPL
Lucianorhabdus cayeauxii Deflandre, 1959
Coniacian-Maastrichtian
near Portland, Dallas County, Alabama, USA
XPL
Marthasterites furcatus (Deflandre in Deflandre and Firt, 1954) Deflandre, 1959
Turonian-Campanian
DSDP Site 258, E.Indian Ocean
XPL
Marthasterites furcatus (Deflandre in Deflandre and Firt, 1954) Deflandre, 1959
Turonian-Campanian
DSDP Hole 550B, NE Atalntic Ocean
SEM
Microrhabdulus decoratus Deflandre, 1959
Cenomanian-Maastrichtian
DSDP Site 401, NE Atlantic Ocean
SEM
Microrhabdulus decoratus Deflandre, 1959
Cenomanian-Maastrichtian
DSDP Site 249, W. Indian Ocean
XPL
Micula staurophora (Gardet, 1955) Stradner, 1963
Coniacian-Maastrichtian
near Ripley, Tippah County, Mississippi, USA
XPL
Prediscosphaera arkhangelskyi (Reinhardt, 1965) Perch-Nielsen, 1984
Santonian-Maastrichtian
DSDP Site 249, W. Indian Ocean
XPL
Prediscosphaera cretacea (Arkhangelsky, 1912) Gartner, 1968
Cenomanian-Maastrichtian
DSDP Site 249, W. Indian Ocean
XPL
Prediscosphaera cretacea (Arkhangelsky, 1912) Gartner, 1968
Cenomanian-Maastrichtian
near Plymouth Bluff, Lowndes County, Alabama, USA
XPL
Quadrum gartneri Prins and Perch-Nielsen in Manivit et al, 1977
Turonian-?Maastrichtian
DSDP Site 217, N. Indian Ocean
XPL
Tranolithus orionatus (Reinhardt, 1966a) Reinhardt, 1966b
Albian-Maastrichtian
Folkestone, UK
XPL
Uniplanarius trifidus (Stradner in Stradner and Papp, 1961) Hattner and Wise, 1980
Campanian-Maastrichtian
DSDP Site 217 N. Indian Ocean
XPL
Uniplanarius trifidus (Stradner in Stradner and Papp, 1961) Hattner and Wise, 1980
Campanian-Maastrichtian
DSDP Site 241 W. Indian Ocean
XPL
Palaeogene
Chiasmolithus solitus (Bramlette and Sullivan, 1961) Locker, 1968
Lutetian-Bartonian (Middle Eocene)
Whitecliff Bay, UK
PC
Chiasmolithus solitus (Bramlette and Sullivan, 1961) Locker, 1968
Lutetian-Bartonian (Middle Eocene)
Fayum, Egypt
oblique distal view SEM
Discoaster tanii Bramlette and Riedel, 1954
Middle Eocene-Oligocene
Hampden Beach, New Zealand
distal view SEM
Discoaster saipanensis Bramlette and Riedel, 1954
Middle-Upper Eocene
Fayum, Egypt
distal view SEM
Discoaster saipanensis Bramlette and Riedel, 1954
Middle-Upper Eocene
Benidorm, Spain
distal view SEM
Discoaster saipanensis Bramlette and Riedel, 1954
Middle-Upper Eocene
Whitecliff Bay, UK
PC
Discoaster kuepperi Sradner, 1959
Lower-Middle Eocene
North Sea, UK
PC
Discoaster kuepperi Sradner, 1959
Lower-Middle Eocene
Benidorm, Spain
proximal view SEM
Discoaster kuepperi Sradner, 1959
Lower-Middle Eocene
Benidorm, Spain
distal view SEM
Discoaster kuepperi Sradner, 1959
Lower-Middle Eocene
Benidorm, Spain
side view SEM
Cruciplacolithus primus Perch-Nielsen, 1977
Upper Palaeocene
St. Paul Monastery, Egypt
oblique distal view SEM
Neococcolithus dubius (Deflandre in Deflandre and Fert, 1954) Black, 1967
Lower-Upper Eocene
Whitecliff Bay, UK
oblique distal view SEM
Neococcolithus dubius (Deflandre in Deflandre and Fert, 1954) Black, 1967
Lower-Upper Eocene
Whitecliff Bay, UK
distal view SEM
Fasciculithus tympaniformis Hay and Mohler in Hay et al, 1967
Upper Palaeocene-Lower Eocene
Pegwell Bay, Kent, UK
XPL
Fasciculithus tympaniformis Hay and Mohler in Hay et al, 1967
Upper Palaeocene-Lower Eocene
St. Paul Monastery, Egypt
oblique proximal view
Fasciculithus tympaniformis Hay and Mohler in Hay et al, 1967
Upper Palaeocene-Lower Eocene
St. Paul Monastery, Egypt
proximal view
Sphenolithus moriformis (Bronniman and Stradner, 1960) Brmlette and Wilcoxon, 1967
Palaeocene-Pliocene
DSDP Site 590B, S.W Pacific
SEM
Sphenolithus moriformis (Bronniman and Stradner, 1960) Brmlette and Wilcoxon, 1967
Palaeocene-Pliocene
DSDP Site 593, S.W Pacific
SEM
Discoaster lodoensis Bramlette and Riedel, 1954
Palaeocene-Pliocene
Benidorm, Spain
XPL
Discoaster lodoensis Bramlette and Riedel, 1954
Palaeocene-Pliocene
Benidorm, Spain
proximal view SEM
Discoaster lodoensis Bramlette and Riedel, 1954
Palaeocene-Pliocene
Benidorm, Spain
distal view SEM
Neogene
Amaurolithus amplificus (Bukry and Percival) Gartner and Bukry, 1975
Upper Miocene-Pliocene
Manavgat, S.Turkey
XPL
Amaurolithus amplificus (Bukry and Percival) Gartner and Bukry, 1975
Upper Miocene-Pliocene
Manavgat, S.Turkey
PC
Coccolithus pelagicus (Wallich, 1871) Schiller, 1930
Lower Palaeocene-Recent
N. Atlantic off S.W coast of Iceland
SEM entire coccosphere
Coccolithus pelagicus (Wallich, 1871) Schiller, 1930
Lower Palaeocene-Recent
ODP Site 1052b, Western N. Atlantic
SEM distal view 10 microns
Coccolithus pelagicus (Wallich, 1871) Schiller, 1930
Lower Palaeocene-Recent
ODP Site 1052b, Western N. Atlantic
SEM proximal view 10 microns
Discoaster challengeri Bramlette and Riedel, 1954
Miocene-Pliocene
Ghajn Tuffieha Bay, Malta
SEM proximal view
Discoaster challengeri Bramlette and Riedel, 1954
Miocene-Pliocene
G. Mihmandar Borehole, Malta
PC
Discoaster exilis Martini and Bramlette, 1963
Middle Miocene
Ghajn Tuffieha Bay, Malta
proximal view SEM
Discoaster exilis Martini and Bramlette, 1963
Middle Miocene
Ghajn Tuffieha Bay, Malta
PC
Discoaster variabilis Martini and Bramlette, 1963
Middle Miocene-Pliocene
Ghajn Tuffieha Bay, Malta
proximal view SEM
Discoaster variabilis Martini and Bramlette, 1963
Middle Miocene-Pliocene
Ghajn Tuffieha Bay, Malta
PC
Florisphaera profunda Okado and Honjo, 1973
Middle Miocene-Recent
Almerian Canyon, Western Mediterranian Sea
10 microns SEM
Gephyrocapsa oceanica Kamptner, 1943
Pleistocene-Recent
Almerian Canyon, Western Mediterranian Sea
10 microns SEM
Calcidiscus tropicus Kamptner, 1956
Lower Miocene-Recent
DSDP Site 593, S.W Pacific Ocean
SEM
Calcidiscus tropicus Kamptner, 1956
Lower Miocene-Recent
DSDP Site 593, S.W Pacific Ocean
SEM
Helicosphaera carteri (Wallich, 1877) Kamptner, 1954
Upper Oligocene-Recent
DSDP Site 590B, S.W Pacific Ocean
XPL
Helicosphaera carteri (Wallich, 1877) Kamptner, 1954
Upper Oligocene-Recent
DSDP Site 590B, S.W Pacific Ocean
proximal view SEM
Reticulofenestra pseudoumbilica (Gartner) Gartner, 1969
Miocene-Pliocene
Ghajn Tuffieha Bay, Malta
proximal view SEM
Reticulofenestra pseudoumbilica (Gartner) Gartner, 1969
Miocene-Pliocene
Ghajn Tuffieha Bay, Malta
coccosphere SEM
Sphenolithus heteromorphus Deflandre, 1953
Lower Miocene-Middle Miocene
DSDP Site 593, S.W Pacific Ocean
SEM
Sphenolithus heteromorphus Deflandre, 1953
Lower Miocene-Middle Miocene
DSDP Site 590B, S.W Pacific Ocean

SE

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