georefid:2004-028821SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1130/B25279.12004-01-01publicationgeorefid:2004-028821doi:10.1130/B25279.1Miller, Kenneth G.Rutgers University, Department of Geological Sciences, Piscataway, NJ, United StatesauthorSugarman, Peter J.New Jersey Geological Survey, United StatesauthorBrowning, James V.Western Michigan University, United StatesauthorKominz, Michelle A.authorOlsson, Richard K.authorFeigenson, Mark D.authorHernandez, John C.authorGeological Society of America (GSA), Boulder, CO, United StatespublisherdocumentHardcopyGeological Society of America Bulletin116 (3-4)368-393We developed a Late Cretaceous sea- level estimate from Upper Cretaceous sequences at Bass River and Ancora, New Jersey (ODP [Ocean Drilling Program] Leg 174AX). We dated 11-14 sequences by integrating Sr isotope and biostratigraphy (age resolution + or -0.5 m.y.) and then estimated paleoenvironmental changes within the sequences from lithofacies and biofacies analyses. Sequences generally shallow up-section from middle-neritic to inner-neritic paleodepths, as shown by the transition from thin basal glauconite shelf sands (transgressive systems tracts [TST]), to medial-prodelta silty clays (highstand systems tracts [HST]), and finally to upper-delta-front quartz sands (HST). Sea-level estimates obtained by backstripping (accounting for paleodepth variations, sediment loading, compaction, and basin subsidence) indicate that large (>25 m) and rapid (<<1 m.y.) sea-level variations occurred during the Late Cretaceous greenhouse world. The fact that the timing of Upper Cretaceous sequence boundaries in New Jersey is similar to the sea-level lowering records of Exxon Production Research Company (EPR), northwest European sections, and Russian platform outcrops points to a global cause. Because backstripping, seismicity, seismic stratigraphic data, and sediment-distribution patterns all indicate minimal tectonic effects on the New Jersey Coastal Plain, we interpret that we have isolated a eustatic signature. The only known mechanism that can explain such global changes- glacio-eustasy-is consistent with foraminiferal delta (super 18) O data. Either continental ice sheets paced sea-level changes during the Late Cretaceous, or our understanding of causal mechanisms for global sea-level change is fundamentally flawed. Comparison of our eustatic history with published ice-sheet models and Milankovitch predictions suggests that small (5-10X10 (super 6) km (super 3) ), ephemeral, and areally restricted Antarctic ice sheets paced the Late Cretaceous global sea-level change. New Jersey and Russian eustatic estimates are typically one-half of the EPR amplitudes, though this difference varies through time, yielding markedly different eustatic curves. We conclude that New Jersey provides the best available estimate for Late Cretaceous sea-level variations.completedStratigraphySedimentary petrologyAncora New JerseyAtlantic Coastal PlainbackstrippingBass RiverbiostratigraphyBurlington County New JerseyCamden County New Jerseyclastic sedimentsclayclimate changecorescorrelationCretaceousdepositional environmenteustacyForaminiferaInvertebrataisotope ratiosisotopesLeg 174AXlithostratigraphyMagothy Formationmarine environmentMarshalltown FormationMerchantville FormationMesozoicmicrofossilsMolluscaNavesink FormationNew JerseyO-18/O-16Ocean Drilling ProgramoxygenpaleoclimatologyProtistasandsea-level changessedimentssequence stratigraphyshelf environmentstable isotopesUnited StatesUpper Cretaceouswell logsEnglishgeoscientificInformation-75.0800-74.220039.350040.1200Camden County New JerseyBurlington County New JerseyWith GSA Data Repository Item 2004043