Response of nannoplankton to major changes in sea-surface temperature and movements of hydrological fronts over Site DSDP 594 (south Chatham Rise, southeastern New Zealand), during the last 130 kyr

Wells, Patricia; Okada, Hisatake

doi:10.1016/s0377-8398(97)00025-x

Cited by 129 publications

(68 citation statements)

References 37 publications

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“…Young, 1998). Wells and Okada (1997) observed by SEM true R. minutula and discussed the possibility that these forms were reworked or that they persisted longer in the studied area. Fig.…”

Section: Holocene -Latest Late Pleistocene Reticulofenestridsmentioning

confidence: 96%

“…parvula has been reported to dominate in the upper part of marine isotope stage (MIS) 5 off of western Australia and to be present in MIS2 (south Chatham Rise, southeastern New Zealand, Wells and Okada, 1997) but there are few other works reporting its fossil record, probably because the very small size of the placolith does not allow easy recognition by LM , and reference therein). Forms < 2.5 Am with no bridge are usually grouped as small Reticulofenestra by LM (Takahashi and Okada, 2000).…”

Section: Holocene -Latest Late Pleistocene Reticulofenestridsmentioning

confidence: 99%

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Abnormal carbonate diagenesis in Holocene–late Pleistocene sapropel-associated sediments from the Eastern Mediterranean; evidence from Emiliania huxleyi coccolith morphology

Crudeli

Young

Erba

et al. 2004

Marine Micropaleontology

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In studying the Holocene -late Pleistocene record of the Eastern Mediterranean, considerable Emiliania huxleyi size/shape variation not clearly assignable to primary or secondary calcification was observed. Accordingly, different morphotypes were distinguished by light microscope (LM).A subsequent scanning electron microscope (SEM) analysis of selected samples has indicated that Emiliania huxleyi coccoliths are variably affected by carbonate diagenesis in these sediments. A series of diagenetic stages were qualitatively defined, comprising well-preserved specimens, three overgrowth (OG1 to OG3) and one etching (E1) stage. Comparing SEM and LM observations, a tentative correlation between the E. huxleyi calcified LM-morphotypes and E. huxleyi SEM-overgrowth stages is proposed here.Our study not only indicates that Emiliania huxleyi coccoliths are strongly influenced by carbonate diagenesis, but also that they show effects of carbonate precipitation and dissolution much more clearly than other coccoliths. The relative abundances of the different LM-morphotypes were used to define an E. huxleyi overgrowth index (EXO) that qualitatively estimates carbonate precipitation/dissolution on coccoliths in this sediment. This resulted in definition of five ''Diagenetic'' intervals (D1 to D5). Deposition of sapropel S1 was a time of good preservation with variable dissolution and no overgrowth of E. huxleyi coccoliths, whereas calcite overgrowth was high during the Last Glacial Maximum (LGM) and interglacial period and, to a lesser extent, during the Younger Dryas and through the last 5 ka. D

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“…Young, 1998). Wells and Okada (1997) observed by SEM true R. minutula and discussed the possibility that these forms were reworked or that they persisted longer in the studied area. Fig.…”

Section: Holocene -Latest Late Pleistocene Reticulofenestridsmentioning

confidence: 96%

Section: Holocene -Latest Late Pleistocene Reticulofenestridsmentioning

confidence: 99%

Abnormal carbonate diagenesis in Holocene–late Pleistocene sapropel-associated sediments from the Eastern Mediterranean; evidence from Emiliania huxleyi coccolith morphology

Crudeli

Young

Erba

et al. 2004

Marine Micropaleontology

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“…C. pelagicus is an in di ca tor of cold and nu tri ent-rich wa ters (Okada and McIntyre, 1979;Win ter et al, 1994;Cachao and Moita, 2000), which is con sis tent with the estuarine cir cu lations in the Early Langhian. On the other hand, the oc cur rence of R. minuta in di cates en vi ron men tal stress char ac ter ized by sa lin ity and nu tri ent os cil la tions (Flores et al, 1997;Wells and Okada, 1997;Kameo, 2002;Wade and Brown, 2006). De te ri orat ing qual ity of sur face wa ters may be linked to sa lin ity os cil lations in a downwelling cir cu la tion re gime ex pand ing from the Med i ter ra nean to the Paratethys.…”

Section: Early Badenian Palaeoenvironment and Its Influence On Bioevementioning

confidence: 99%

Timing of Langhian bioevents in the Carpathian Foredeep and northern Pannonian Basin in relation to oceanographic, tectonic and climatic processes

Holcová

Doláková

Nehyba

et al. 2018

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“…sug gest a sea sonal suc ces sion of as sem blages (e.g., Reynold and Thunell, 1985;Rigual-Hernandez et al, 2012;Kuhnt et al, 2013;Salmon et al, 2014). The phytoplankton is dom i nated by Reticulofenestra minuta char ac ter iz ing en vi ron men tal stress with rapid changes within that en vi ron ment, in clud ing os cil la tions of sa lin ity (Wade and Brown, 2006), and nu tri ent con tent (Flores et al, 1997;Wells and Okada, 1997;Kameo, 2002) con sis tent with the varied test size of the Globigerina bulloides/praebulloides group. The in crease of Coccolithus pelagicus at 19.5 m is tra di tion ally con sid ered as an in di ca tor of cold, but mainly nu tri ent-rich wa ter (Okada and McIntyre, 1979;Win ter et al, 1994;Cachao and Moita, 2000) and in di cates here cool ing and/or in crease of nutri ents from this level.…”

Section: Interpretation Of Palaeoenvironmentmentioning

confidence: 99%

Recostruction of the unusual Mid Miocene (Badenian) palaeoenvironment of the Carpathian Foredeep (Lomnice/Tišnov denudational relict, Czech Republic)

Holcová

Brzobohatý

Kopecká

et al. 2015

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Multiproxy sedimentological, gamma-spec tro met ric, foraminiferal, cal car e ous nannoplankton, and otolith data were used for the re con struc tion of the Badenian (Mid dle Mio cene) his tory of the Moravian part of the Carpathian Foredeep. The study mate rial orig i nated from the new bore hole LOM-1, which drilled >20 metres of mo not o nous clayey siltstones with ex cep tion ally rich and well-pre served microfossil as sem blages. Dis tal parts of the Carpathian Foredeep (a forebulge depozone) are exposed in this suc ces sion. Gen er ally, a quiet en vi ron ment of outer shelf to up per bathyal of mo not o nous clayey silts was in terpreted, which is typ i cal for the prox i mal parts of a pe riph eral fore land ba sin. The sec tion stud ied can be sub di vided into six in ter vals, con firm ing the cy cli cal char ac ter of Mid dle Mio cene sed i men ta tion in the Cen tral Paratethys. Interannual os cil lations of nu tri ent con tent, tem per a ture and/or sa lin ity are in ter preted based on the os cil la tions of geo chem i cal as well as palaeo bio logi cal data. The turn over con nected with the ini ti a tion of the Mid dle Mio cene Cli ma tic Tran si tion is re corded above the LO (last oc cur rence) of Helicosphaera waltrans in agree ment with pre vi ous ob ser va tions in the Carpathian Foredeep. The changes in clude cool ing, a de crease in nu tri ents, a prob a ble in crease of the sa lin ity of sur face wa ter, and in crease of sea son al ity. Sea son al ity was man i fested by an al ter na tion of mixed and strat i fied wa ter col umns with a sea sonal in put of nutri ents. Con cern ing nu tri ents, sources of sea sonal riverine in put or sea sonal upwelling are both pos si ble.

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Response of nannoplankton to major changes in sea-surface temperature and movements of hydrological fronts over Site DSDP 594 (south Chatham Rise, southeastern New Zealand), during the last 130 kyr

Cited by 129 publications

References 37 publications

Abnormal carbonate diagenesis in Holocene–late Pleistocene sapropel-associated sediments from the Eastern Mediterranean; evidence from Emiliania huxleyi coccolith morphology

Abnormal carbonate diagenesis in Holocene–late Pleistocene sapropel-associated sediments from the Eastern Mediterranean; evidence from Emiliania huxleyi coccolith morphology

Timing of Langhian bioevents in the Carpathian Foredeep and northern Pannonian Basin in relation to oceanographic, tectonic and climatic processes

Recostruction of the unusual Mid Miocene (Badenian) palaeoenvironment of the Carpathian Foredeep (Lomnice/Tišnov denudational relict, Czech Republic)

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