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Hötzel, Sebastian; Dupont, Lydie M; Marret, Fabienne; Jung, Gerlinde; Wefer, Gerold (2016): Dinoflagellate cyst counts of ODP Site 1081, Benguela Upwelling, Miocene-Pliocene. PANGAEA, https://doi.org/10.1594/PANGAEA.858185, Supplement to: Hötzel, S et al. (2016): Steps in the intensification of Benguela upwelling over the Walvis Ridge during Miocene and Pliocene. International Journal of Earth Sciences, 1-13, https://doi.org/10.1007/s00531-016-1309-0

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Abstract:
Using the Late Miocene to Pliocene organic-walled dinoflagellate cyst record of ODP Site 1081 we reconstruct and discuss the early upwelling history over the Walvis Ridge with a special focus on the movement of the Angola-Benguela Front (ABF). We suggest that during the Late Miocene the Angola Current flowed southwards over the Walvis Ridge more frequently than today because the ABF was probably located further south as a result of a weaker meridional temperature gradient. A possible strengthening of the meridional gradient during the latest Miocene to early Pliocene in combination with uplift of south-western Africa intensified the upwelling along the coast and increased the upwelling's filaments over the Walvis Ridge. An intermediate period from 6.2 to 5.5 Ma is shown by the dominance of Habibacysta tectata, cysts of a cool-tolerant dinoflagellate known from the northern Atlantic, indicating changing oceanic conditions contemporaneous with the Messinian Salinity Crisis. From 4.3 Ma on, the upwelling signal got stronger again and waters were well-mixed and nutrient-rich. Our results indicate a northward migration of the ABF as early as 7 Ma and the initial stepwise intensification of the BUS.
Project(s):
Coverage:
Latitude: -19.619690 * Longitude: 11.319300
Date/Time Start: 1997-09-09T02:00:00 * Date/Time End: 1997-09-11T21:15:00
Minimum DEPTH, sediment/rock: 198.27 m * Maximum DEPTH, sediment/rock: 448.12 m
Event(s):
175-1081A * Latitude: -19.619690 * Longitude: 11.319300 * Date/Time Start: 1997-09-09T02:00:00 * Date/Time End: 1997-09-11T21:15:00 * Elevation: -794.1 m * Penetration: 452.7 m * Recovery: 393.48 m * Location: Benguela Current, South Atlantic Ocean * Campaign: Leg175 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 49 cores; 452.7 m cored; 0 m drilled; 86.9 % recovery
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, sediment/rockDepthmDupont, Lydie MGeocode
2AGEAgeka BPDupont, Lydie MGeocode
3Sample code/labelSample labelDupont, Lydie M
4Impagidinium spp.Impagidinium spp.#Dupont, Lydie MCounting, dinoflagellate cysts
5Impagidinium aculeatumI. aculeatum#Dupont, Lydie MCounting, dinoflagellate cysts
6Impagidinium paradoxumI. paradoxum#Dupont, Lydie MCounting, dinoflagellate cysts
7Impagidinium sphaericumI. sphaericum#Dupont, Lydie MCounting, dinoflagellate cysts
8Impagidinium patulumI. patulum#Dupont, Lydie MCounting, dinoflagellate cysts
9Impagidinium strialatumI. strialatum#Dupont, Lydie MCounting, dinoflagellate cysts
10Impagidinium species 2 after De Schepper & Head (2009)Impagidinium sp. 2#Dupont, Lydie MCounting, dinoflagellate cysts
11Operculodinium spp.Operculodinium spp.#Dupont, Lydie MCounting, dinoflagellate cysts
12Operculodinium janducheneiO. janduchenei#Dupont, Lydie MCounting, dinoflagellate cysts
13Operculodinium centrocarpumO. centrocarpum#Dupont, Lydie MCounting, dinoflagellate cysts
14Operculodinium israelianumO. israelianum#Dupont, Lydie MCounting, dinoflagellate cysts
15Pentapharsodinium daleiP. dalei#Dupont, Lydie MCounting, dinoflagellate cysts
16Lingulodinium machaerophorumL. machaerophorum#Dupont, Lydie MCounting, dinoflagellate cysts
17Brigantedinium spp.Brigantedinium spp.#Dupont, Lydie MCounting, dinoflagellate cysts
18Selenopemphix nephroidesS. nephroides#Dupont, Lydie MCounting, dinoflagellate cysts
19Selenopemphix brevispinosaS. brevispinosa#Dupont, Lydie MCounting, dinoflagellate cysts
20Selenopemphix brevispinosa conspicuaS. brevispinosa conspicua#Dupont, Lydie MCounting, dinoflagellate cysts
21Selenopemphix quantaS. quanta#Dupont, Lydie MCounting, dinoflagellate cysts
22Selenopemphix armageddonensisS. armageddonensis#Dupont, Lydie MCounting, dinoflagellate cysts
23Spiniferites spp.Spiniferites spp.#Dupont, Lydie MCounting, dinoflagellate cysts
24Spiniferites ramosusS. ramosus#Dupont, Lydie MCounting, dinoflagellate cysts
25Spiniferites mirabilisS. mirabilis#Dupont, Lydie MCounting, dinoflagellate cysts
26Spiniferites cf. mirabilisS. cf. mirabilis#Dupont, Lydie MCounting, dinoflagellate cysts
27Spiniferites membranaceusS. membranaceus#Dupont, Lydie MCounting, dinoflagellate cysts
28Acomosphaera spp.Acomosphaera spp.#Dupont, Lydie MCounting, dinoflagellate cysts
29Nematosphaeropsis labyrinthusN. labyrinthus#Dupont, Lydie MCounting, dinoflagellate cysts
30Batiacasphaera micropapillataB. micropapillata#Dupont, Lydie MCounting, dinoflagellate cysts
31Batiacasphaera hirsutaB. hirsuta#Dupont, Lydie MCounting, dinoflagellate cysts
32Trinovantedinium glorianumT. glorianum#Dupont, Lydie MCounting, dinoflagellate cysts
33Trinovantedinium papulaT. papula#Dupont, Lydie MCounting, dinoflagellate cysts
34Trinovantedinium ferugnomatumT. ferugnomatum#Dupont, Lydie MCounting, dinoflagellate cysts
35Trinovantedinium applanatumT. applanatum#Dupont, Lydie MCounting, dinoflagellate cysts
36Tuberculodinium vancampoaeT. vancampoae#Dupont, Lydie MCounting, dinoflagellate cysts
37Pyxidinopsis reticulataP. reticulata#Dupont, Lydie MCounting, dinoflagellate cysts
38Habibacysta tectataH. tectata#Dupont, Lydie MCounting, dinoflagellate cysts
39Lejeunecysta spp.Lejeunecysta spp.#Dupont, Lydie MCounting, dinoflagellate cysts
40Lejeunecysta olivaL. oliva#Dupont, Lydie MCounting, dinoflagellate cysts
41Lejeunecysta sabrinaL. sabrina#Dupont, Lydie MCounting, dinoflagellate cysts
42Ataxiodinium zevenboomiiA. zevenboomii#Dupont, Lydie MCounting, dinoflagellate cysts
43Ataxiodinium confusumA. confusum#Dupont, Lydie MCounting, dinoflagellate cysts
44Quinquecuspis concretaQ. concreta#Dupont, Lydie MCounting, dinoflagellate cysts
45Sumatradinium soucouyantiaeS. soucouyantae#Dupont, Lydie MCounting, dinoflagellate cysts
46Dinoflagellate cyst indeterminataDinofl indet#Dupont, Lydie MCounting, dinoflagellate cystsvaria
47Dinoflagellates, totalDinofl total#Dupont, Lydie MCounting, dinoflagellate cysts
48Marker, foundMark found#Dupont, Lydie MCounting, dinoflagellate cysts
49VolumeVolmlDupont, Lydie MCounting, dinoflagellate cysts
50Marker, addedMark add#Dupont, Lydie MCounting, dinoflagellate cysts
Size:
3408 data points

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