Planktonic foraminiferal stratigraphy, datum levels and ages of ODP Sites 184-1146 and 184-1148, South China Sea


Autoria(s): Li, Qianyu; Jian, Zhimin; Li, Baohua
Cobertura

MEDIAN LATITUDE: 18.939548 * MEDIAN LONGITUDE: 116.516781 * SOUTH-BOUND LATITUDE: 18.836110 * WEST-BOUND LONGITUDE: 116.272917 * NORTH-BOUND LATITUDE: 19.456700 * EAST-BOUND LONGITUDE: 116.565650 * DATE/TIME START: 1999-03-21T00:00:00 * DATE/TIME END: 1999-04-10T00:00:00

Data(s)

20/06/2004

Resumo

Over 30 first and last occurrence (FO and LO, respectively) planktonic foraminifer datums were recognized from the Oligocene-Miocene section of Ocean Drilling Program (ODP) Site 1148. Most datum levels occur in similar order as, and are by correlation as probably synchronous with, their open-ocean records. Several datum levels represent local bioevents resulting from dissolution and Site 1148's unique paleoceanographic setting in the northern South China Sea. An age of 9.5-9.8 Ma is estimated for the local LO of Globoquadrina dehiscens (257 meters composite depth [mcd]), whereas the local LO of Globorotalia fohsi s.l. (301 mcd) is projected to be at ~13.0 Ma and the local FO of Globigerinatella insueta (367 mcd) is projected to be at ~18.0 Ma. The combined planktonic foraminifer and nannofossil results indicate that the Oligocene-Miocene section at Site 1148 is not complete. Unconformities up to 2-3 m.y. in duration, occurring at and before the Oligocene/Miocene boundary (OHS1, OHS2, OHS3, and OHS4 = MHS1), are associated with slump deposits between 457 and 495 mcd that signal tectonic instability during the transition from rifting to spreading in the South China Sea. Shorter unconformities of <0.5 m.y. duration that truncate the Miocene section were more likely to have been caused by sea-bottom erosion as well as dissolution. A total of 12 Miocene unconformities, MHS1 through MHS12, are mainly affected by dissolution and an elevated carbonate compensation depth (CCD) during Miocene third-order glaciations recorded in deep-sea positive oxygen isotope Mi glaciation events. Respectively, they fall at ~457 mcd (MHS1 = Mi-1), 407 mcd (MHS2 = Mi-1a), 385 mcd (MHS3 = Mi-1aa), 366 mcd (MHS4 = Mi-1b), 358 mcd (MHS5 = MLi-1), 333 mcd (MHS6 = Mi-2), 318 mcd (MHS7 = MSi-1), 308 mcd (MHS8 = Mi-3), 295 mcd (MHS9 = Mi-4), 288 mcd (MHS10 = Mi-5), 256 mcd (MHS11 = Mi-6), and 250 mcd (MHS12 = Mi-7). The correlation of these unconformities with Mi events indicates that some related driving mechanisms have been operating, causing deepwater circulation changes concomitantly in world oceans and in the marginal South China Sea.

Formato

application/zip, 3 datasets

Identificador

https://doi.pangaea.de/10.1594/PANGAEA.784437

doi:10.1594/PANGAEA.784437

Idioma(s)

en

Publicador

PANGAEA

Direitos

CC-BY: Creative Commons Attribution 3.0 Unported

Access constraints: unrestricted

Fonte

Supplement to: Li, Qianyu; Jian, Zhimin; Li, Baohua (2004): Oligocene-Miocene planktonic foraminifer biostratigraphy, Site 1148, northern South China Sea. In: Prell, W.L., Wang, P., Blum, P., Rea, D.K., Clemens, S.C. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 184, 1-26, doi:10.2973/odp.proc.sr.184.220.2004

Palavras-Chave #184-1146; 184-1148; 184-1148A; Abundance estimate; Age, difference; Age, maximum/old; Age, minimum/young; Age diff; Age max; Age min; Age model; Age model, Berggren et al (1995) BKSA95; Age model, optional; Age model opt; Ageprof dat des; Ageprofile Datum Description; ages adjusted by Chaisson and Pearson (1997) and Pearson and Chaisson (1997).; bottom; boundary; C. dissimilis; C. nitida; C. parvulus; C. unicavus; Candeina nitida; Catapsydrax dissimilis; Catapsydrax parvulus; Catapsydrax unicavus; Comment; COMPCORE; Composite Core; D. altispira; D. globosa; Dentoglobigerina altispira; Dentoglobigerina globosa; Depth; Depth, composite; Depth, composite bottom; Depth, composite top; DEPTH, sediment/rock; Depth c bot; Depth comp; Depth c top; dissolution effects: VS = very strong (with most tests dissolved or broken), S = strong (with over 30% tests broken), M = moderate (with 10%-30% tests broken); DRILL; Drilling/drill rig; Event; FO = first occurrence, LO = last occurrence; Foraminifera, planktic abundance; Foram plankt; for Reference see parameter Reference/source; G. altiapertura; G. archeomenardii; G. binaiensis; G. birnageae; G. bulloides; G. ciperoensis; G. conglobatus; G. dehiscens; G. extremus; G. fohsi; G. glutinata; G. insueta; G. juvenilis; G. kennetti; G. menardii; G. miotumida; G. obesa; G. obliquus; G. peripheroacuta; G. peripheroronda; G. plesiotumida; G. praefohsi; G. praemenardii; G. praescitula; G. primordius; G. ruber; G. sacculifer; G. scitula; G. siphonifera; G. suteri; G. tripartita; G. tumida; G. venezuelana; Globigerina bulloides; Globigerina ciperoensis; Globigerinatella insueta; Globigerinella obesa; Globigerinella siphonifera; Globigerinita glutinata; Globigerinita juvenilis; Globigerinoides altiapertura; Globigerinoides bulloides; Globigerinoides conglobatus; Globigerinoides extremus; Globigerinoides kennetti; Globigerinoides obliquus; Globigerinoides primordius; Globigerinoides ruber; Globigerinoides sacculifer; Globoquadrina binaiensis; Globoquadrina dehiscens; Globoquadrina tripartita; Globoquadrina venezuelana; Globorotalia archeomenardii; Globorotalia birnageae; Globorotalia fohsi; Globorotalia menardii; Globorotalia miotumida; Globorotalia peripheroacuta; Globorotalia peripheroronda; Globorotalia plesiotumida; Globorotalia praefohsi; Globorotalia praemenardii; Globorotalia praescitula; Globorotalia scitula; Globorotalia spp.; Globorotalia tumida; Globorotaloides suteri; Joides Resolution; Label; Label 2; Leg184; N. acostaensis; N. continuosa; Nannofossil zone; Nannos zone; Neogloboquadrina acostaensis; Neogloboquadrina continuosa; O. suturalis; O. universa; Ocean Drilling Program; ODP; ODP sample designation; Orbulina suturalis; Orbulina universa; P. birnageae; P. curva; P. glomerosa; P. kugleri; P. mayeri; P. nana; P. primalis; P. semivera; P. sicana; Paragloborotalia birnageae; Paragloborotalia kugleri; Paragloborotalia mayeri; Paragloborotalia nana; Paragloborotalia semivera; Praeorbulina curva; Praeorbulina glomerosa; Praeorbulina sicana; Pulleniatina primalis; Reference; Reference/source; S. dehiscens; S. disjuncta; S. kochi; s.l.; S. seminulina; Samp com; Sample code/label; Sample code/label 2; Sample comment; South China Sea; Sphaeroidinella dehiscens; Sphaeroidinellopsis disjuncta; Sphaeroidinellopsis kochi; Sphaeroidinellopsis seminulina; top; Z. apertura; Z. connecta; Z. decoraperta; Z. druryi; Z. nepenthes; Z. rubescens; Z. woodi; Zeaglobigerina apertura; Zeaglobigerina connecta; Zeaglobigerina decoraperta; Zeaglobigerina druryi; Zeaglobigerina nepenthes; Zeaglobigerina rubescens; Zeaglobigerina woodi
Tipo

Dataset