FN Archimer Export Format
PT J
TI Seagrass-related carbonate ramp development at the front of a fan delta (Burdigalian, New Caledonia): Insights into mixed carbonate-siliciclastic environments
BT 
AF Tournadour, Elsa
   Fournier, F.
   Etienne, S.
   Collot, Julien
   Maurizot, P.
   Patriat, Martin
   Sevin, B.
   Morgans, H.E.G.
   Martin-Garin, B.
   Braga, J.C.
AS 1:1,2;2:3;3:1,2;4:2;5:2;6:4;7:2;8:5;9:3;10:6;
FF 1:;2:;3:;4:;5:;6:PDG-REM-GM-LAD;7:;8:;9:;10:;
C1 Adecal Technopole, 1 bis Rue Berthelot, Doniambo, B.P. 2384-98 846, Nouméa, New Caledonia
   Service Géologique de Nouvelle-Calédonie, DIMENC, B.P. 465, 98845, Nouméa, New Caledonia
   Aix Marseille Univ, CNRS, IRD, INRAE, Coll France, CEREGE, Case 67, 3, 13331, Marseille Cedex 03, France
   IFREMER, Unité Géosciences Marines, 29280, Plouzané, France
   GNS Sciences, PO Box 30368, Lower Hutt, 5040, New Zealand
   Universidad de Granada, Departamento de Estratigrafía y Paleontología, Avenida de La Fuente Nueva, 18071, Granada, Spain
C2 ADECAL TECHNOPOLE, FRANCE
   DIMENC, FRANCE
   UNIV AIX MARSEILLE, FRANCE
   IFREMER, FRANCE
   GNS SCIENCES, NEW ZEALAND
   UNIV GRANADA, SPAIN
SI BREST
SE PDG-REM-GM-LAD
IN WOS Ifremer UPR
   copubli-france
   copubli-europe
   copubli-univ-france
   copubli-int-hors-europe
IF 4.348
TC 8
UR https://archimer.ifremer.fr/doc/00641/75269/75484.pdf
LA English
DT Article
DE ;Miocene;Seagrass;Tropical carbonates;Terrigenous inputs;Alluvial fan;Facies association;New Caledonia
AB Past shallow-water carbonate environments of the main island of New Caledonia (NC) have been subject to high terrigenous influx derived from the erosion of ultramafic obducted nappes and are therefore a relevant case study for characterizing neritic carbonate production in mixed carbonate-siliciclastic systems under a tropical climate. More particularly, we focused on Burdigalian carbonate sedimentary records cropping out on the western coast of NC, in the Népoui area. Based on a comprehensive sedimentological study of cores and outcrops, we established a new depositional model of an alluvial fan to carbonate ramp transition. Shallow-water (euphotic) carbonate production was dominated by seagrass-related biota and corals derived from small-sized bioconstructions. Extensional tectonics and associated normal faulting, driven by post-obduction isostatic rebound, favored carbonate ramp aggradation and preservation. The carbonate ramp was incised by conglomerate-filled terminal distributary channels, which indicate that terrigenous inputs remained significant during marine transgression and did not inhibit the development of seagrass and scleractinian carbonate factories. Phytal substrates induced by seagrass and/or macro-algae seafloor colonization strongly controlled the nature of carbonate production and promoted the accumulation of foraminiferal-coralline algal sediments. Seagrass development at the front of the fan delta is interpreted to have controlled the preservation of a diverse and significant carbonate production by reducing water turbidity and by limiting the risk of suffocation for filter-feeding biota in such a high terrigenous influx setting. 
PY 2020
PD NOV
SO Marine And Petroleum Geology
SN 0264-8172
PU Elsevier BV
VL 121
UT 000569064200010
DI 10.1016/j.marpetgeo.2020.104581
ID 75269
ER

EF