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Hötzel, Sebastian; Dupont, Lydie M; Wefer, Gerold (2015): Pollen and spores of ODP Hole 175-1081A, Miocene-Pliocene, Walvis Ridge. PANGAEA, https://doi.org/10.1594/PANGAEA.842569, Supplement to: Hötzel, S et al. (2015): Miocene-Pliocene Vegetation change in south-western Africa (ODP Site 1081, offshore Namibia). Palaeogeography, Palaeoclimatology, Palaeoecology, 423, 102-108, https://doi.org/10.1016/j.palaeo.2015.02.002

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Abstract:
Aridification is an important component of Late Neogene climate change in south-western Africa probably caused by modifications in the atmospheric circulation in relation to the initiation and intensification of the Benguela Upwelling System due to globally steepening of the meridional pressure gradient. Intensification of the meridional pressure gradient influenced the climate intensively which had then an impact on the vegetation. However, vegetation changes of south-western Africa from the Miocene to Pliocene have not yet been reported and only indirectly investigated by sedimentological data. Here, we present a pollen record of marine ODP Site 1081 retrieved 160 km offshore Namibia covering the time between 9 and 2.7 Ma. Using an endmember unmixing model we distinguished three vegetation phases: a relative wet phase, during the Tortonian, showing higher representations of Cyperaceae, a transition phase during the Messinian, when especially grasses expanded, and a dry one covering the Pliocene with a strong representation of desert and semi-desert plants. The three phases indicate ongoing aridification probably caused by intensified meridional pressure gradients. Additionally, aquatic vegetation indicators appear in our pollen record from around 5 Ma on, which we attribute to a relocation of the lower course of the Cunene River to its modern outlet in the Atlantic Ocean. Redirection of the Cunene River toward the Atlantic would have deprived the palaeolake Cunene of an important source of fresh-water ultimately resulting in desiccation of the lake and the formation of the Etosha Pan.
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 * Device: Drilling/drill rig (DRILL) * Comment: 49 cores; 452.7 m cored; 0 m drilled; 86.9 % recovery
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Sample code/labelSample labelDupont, Lydie M
2DEPTH, sediment/rockDepthmGeocode
3AGEAgeka BPGeocode
4VolumeVolmlDupont, Lydie M
5Marker, addedMark add#Dupont, Lydie M
6Marker, foundMark found#Dupont, Lydie M
7PoaceaePoac#Dupont, Lydie MCounting, palynology
8CyperaceaeCypae#Dupont, Lydie MCounting, palynology
9Pentzia-typePentzia-T#Dupont, Lydie MCounting, palynology
10Cotula-typeCotula-T#Dupont, Lydie MCounting, palynology
11Dicoma-typeDico-T#Dupont, Lydie MCounting, palynology
12Gerbera-typeGerb-T#Dupont, Lydie MCounting, palynology
13Asteraceae tubilifloraeA. tubiliflorae#Dupont, Lydie MCounting, palynology
14Vernonia-typeVernonia-T#Dupont, Lydie MCounting, palynology
15Senecio-typeSen-T#Dupont, Lydie MCounting, palynology
16Asteraceae tubilifloraeA. tubiliflorae#Dupont, Lydie MCounting, palynologyA. tubiliflorae type K
17AcanthaceaeAcanteae#Dupont, Lydie MCounting, palynology
18PetalidiumPetalidi#Dupont, Lydie MCounting, palynology
19RuelliaRuellia#Dupont, Lydie MCounting, palynology
20Trichotomosulcate reticulateT. reti#Dupont, Lydie MCounting, palynology
21BrachystegiaBrachyst#Dupont, Lydie MCounting, palynology
22Colophospermum mopaneC. mopane#Dupont, Lydie MCounting, palynology
23DetariumDetarium#Dupont, Lydie MCounting, palynology
24GrewiaGrewia#Dupont, Lydie MCounting, palynology
25Borassus-typeBorass-T#Dupont, Lydie MCounting, palynology
26Dombeya-typeDombeya-T#Dupont, Lydie MCounting, palynology
27Malvaceae (Africa)Malvacea#Dupont, Lydie MCounting, palynology
28AizoaceaeAizoeae#Dupont, Lydie MCounting, palynology
29MonsoniaMonsonia#Dupont, Lydie MCounting, palynology
30WelwitschiaWelwitsc#Dupont, Lydie MCounting, palynology
31TribulusTus#Dupont, Lydie MCounting, palynology
32Amaranthaceae/ChenopodiaceaeChen/Amar#Dupont, Lydie MCounting, palynology
33MerremiaMerremia#Dupont, Lydie MCounting, palynology
34Artemisia-typeArt-T#Dupont, Lydie MCounting, palynology
35Berkheya-typeBerkheya-T#Dupont, Lydie MCounting, palynology
36PhaeocerosPhaeoc#Dupont, Lydie MCounting, palynology
37Stoebe-typeStoebe-T#Dupont, Lydie MCounting, palynology
38EricaceaeEriae#Dupont, Lydie MCounting, palynology
39LycopodiumLyc#Dupont, Lydie MCounting, palynology
40OleaceaeOleae#Dupont, Lydie MCounting, palynology
41PodocarpusPod#Dupont, Lydie MCounting, palynology
42MohriaMohria#Dupont, Lydie MCounting, palynology
43PasserinaPasserina#Dupont, Lydie MCounting, palynology
44ThymelaeaceaeThyae#Dupont, Lydie MCounting, palynology
45BlepharisBlephari#Dupont, Lydie MCounting, palynology
46Justicia-typeJusticia-T#Dupont, Lydie MCounting, palynology
47EuphorbiaEup#Dupont, Lydie MCounting, palynology
48AcaciaAca#Dupont, Lydie MCounting, palynology
49NyctaginaceaeNyctceae#Dupont, Lydie MCounting, palynology
50RicciaRic#Dupont, Lydie MCounting, palynology
51Neurada/GrielumNeurceae#Dupont, Lydie MCounting, palynology
52CommiphoraCommipho#Dupont, Lydie MCounting, palynology
53PhyllanthusPhyllant#Dupont, Lydie MCounting, palynology
54ProteaceaeProteaceae#Dupont, Lydie MCounting, palynology
55NymphaeaNym#Dupont, Lydie MCounting, palynology
56TyphaTyp#Dupont, Lydie MCounting, palynology
57PolygonumPol#Dupont, Lydie MCounting, palynology
58Osmunda-typeOsm-T#Dupont, Lydie MCounting, palynology
59SelaginellaSel#Dupont, Lydie MCounting, palynology
60Spores, variaSpores varia#Dupont, Lydie MCounting, palynologysp.2 bacculate
61Spores, variaSpores varia#Dupont, Lydie MCounting, palynologysp.3 leiotrilete, thick labra
62PolypodiaceaePocae#Dupont, Lydie MCounting, palynology
63AniseiaAniseia#Dupont, Lydie MCounting, palynology
64Evolvulus-typeEvolvulus-T#Dupont, Lydie MCounting, palynology
65AbutilonAbu#Dupont, Lydie MCounting, palynology
66Rubiaceae tetradeRubtetra#Dupont, Lydie MCounting, palynology
67CasuarinaCau#Dupont, Lydie MCounting, palynology
68TiliaceaeTiliceae#Dupont, Lydie MCounting, palynologyTiliaceae-type
69MeliaceaeMeliaceae#Dupont, Lydie MCounting, palynology
70Euphorbiaceae undifferentiatedEuphceae.ud#Dupont, Lydie MCounting, palynology
71BarleriaBarleria#Dupont, Lydie MCounting, palynology
72ArecaceaeArecceae#Dupont, Lydie MCounting, palynology
73Gazania-typeGazania-T#Dupont, Lydie MCounting, palynology
74MyricaMyr#Dupont, Lydie MCounting, palynology
75PterisPes#Dupont, Lydie MCounting, palynology
76RestionaceaeRestceae#Dupont, Lydie MCounting, palynology
77CliffortiaCliffortia#Dupont, Lydie MCounting, palynology
78GardeniaGardenia#Dupont, Lydie MCounting, palynology
79EcboliumEcbolium#Dupont, Lydie MCounting, palynology
80Hypoestes typeHypoes-T#Dupont, Lydie MCounting, palynology
81Asystasia gangeticaA. gangetica#Dupont, Lydie MCounting, palynology
82PeristrophePeris#Dupont, Lydie MCounting, palynology
83Mesembryanthenum-typeMesembry-T#Dupont, Lydie MCounting, palynology
84Sorindeia-typeSori-T#Dupont, Lydie MCounting, palynology
85AdeniumAdenium#Dupont, Lydie MCounting, palynology
86Picris-typePicris-type#Dupont, Lydie MCounting, palynology
87SpathodeaSpathode#Dupont, Lydie MCounting, palynology
88PiliostigmaPiliosti#Dupont, Lydie MCounting, palynology
89Isoberlinia-typeBerlin-T#Dupont, Lydie MCounting, palynology
90Cassia-typeCassia-T#Dupont, Lydie MCounting, palynology
91DelonixDelonix#Dupont, Lydie MCounting, palynology
92CombretaceaeComeae#Dupont, Lydie MCounting, palynology
93IpomoeaIpomoea#Dupont, Lydie MCounting, palynology
94HildebrandtiaHildenbr#Dupont, Lydie MCounting, palynologyHildebrandtia-type
95CocciniaCoccinia#Dupont, Lydie MCounting, palynology
96KedrostisKedrosti#Dupont, Lydie MCounting, palynology
97LuffaLuffa#Dupont, Lydie MCounting, palynology
98CephalariaCep#Dupont, Lydie MCounting, palynology
99EphedraEph#Dupont, Lydie MCounting, palynology
100AmanoaAmanoa#Dupont, Lydie MCounting, palynology
101MallotusMallotus#Dupont, Lydie MCounting, palynology
102HeveaHevea#Dupont, Lydie MCounting, palynology
103TetrorchidiumTetrorch#Dupont, Lydie MCounting, palynology
104JatrophaJatropha#Dupont, Lydie MCounting, palynology
105VignaVigna#Dupont, Lydie MCounting, palynology
106PelargoniumPelargon#Dupont, Lydie MCounting, palynology
107Gunnera perpensaG. perpensa#Dupont, Lydie MCounting, palynology
108BasilicumBasilicu#Dupont, Lydie MCounting, palynology
109Pavonia-typePavonia-T#Dupont, Lydie MCounting, palynology
110Mimosaceae undifferentiatedMimoceae.ud#Dupont, Lydie MCounting, palynology
111Dichrostachys cinereaDichrost#Dupont, Lydie MCounting, palynology
112Myrsine africanaMyrsine#Dupont, Lydie MCounting, palynology
113RapaneaRapanea#Dupont, Lydie MCounting, palynology
114JasminumJam#Dupont, Lydie MCounting, palynology
115SesamumSesam#Dupont, Lydie MCounting, palynology
116PolygalaPga#Dupont, Lydie MCounting, palynology
117Rubiaceae undifferentiatedRubea.ud#Dupont, Lydie MCounting, palynology
118PentasPentas#Dupont, Lydie MCounting, palynology
119Diodia-typeDiodia-T#Dupont, Lydie MCounting, palynology
120RothmanniaRothmann#Dupont, Lydie MCounting, palynology
121ClausenaClausena#Dupont, Lydie MCounting, palynology
122ZanthoxylumZanthoxy#Dupont, Lydie MCounting, palynology
123Sterculia-typeStercu-T#Dupont, Lydie MCounting, palynology
124Heritiera-typeHeriti-T#Dupont, Lydie MCounting, palynology
125CeltisCel#Dupont, Lydie MCounting, palynology
126undeterminedvaria#Dupont, Lydie MCounting, palynology
127Spores, variaSpores varia#Dupont, Lydie MCounting, palynology
128Sporomorphes, totalSporom#Dupont, Lydie MCounting, palynology
Size:
8946 data points

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