Relative abundances of planktonic foraminifera in ODP Site 121-758 (Table 1) ...

• Main Authors: Chen, Min-Te, Farrell, John W
• Format: Dataset
• Language: English
• Published: PANGAEA 1991
• Subjects: Sample code/label; DEPTH, sediment/rock; AGE; Orbulina universa; Globigerinoides conglobatus; Globigerinoides ruber; Globigerinoides tenellus; Globigerinoides sacculifer; Sphaeroidinella dehiscens; Globigerinella aequilateralis; Globigerina calida; Globigerina bulloides; Globigerina falconensis; Globigerina digitata; Globigerina rubescens; Globigerina pachyderma dextral; Neogloboquadrina dutertrei; Globoquadrina conglomerata; Globoquadrina hexagona; Pulleniatina obliquiloculata; Globorotalia inflata; Globorotalia truncatulinoides sinistral; Globorotalia truncatulinoides dextral; Globorotalia crassaformis; Neogloboquadrina pachyderma dextral and dutertrei integrade; Globorotalia hirsuta; Globorotalia scitula; Globorotalia menardii; Globorotalia tumida; Globigerinita glutinata; Composite Core; DSDP/ODP/IODP sample designation; Counting >150 µm fraction; Leg121; Joides Resolution; Ocean Drilling Program ODP; Neogloboquadrina pachyderma; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.1594/pangaea.728968; https://doi.pangaea.de/10.1594/PANGAEA.728968

We present a high-resolution (6 k.y. sample interval) record of planktonic foraminifer faunal variations for the past 800 k.y. from ODP Site 758 in the northeastern Indian Ocean. The record is examined within the context of a coarse fraction stratigraphy which is a lithologic index of CaCO3 preservation, and an oxygen isotope stratigraphy which provides a chronostratigraphy and a record of climate change. Variations in the relative abundance of 27 planktonic foraminifer species primarily reflect fluctuations in the intensity of CaCO3 dissolution. CaCO3 dissolution covaries with climate fluctuations at a cyclicity of about 100 k.y. Glacial-aged sediments are generally well preserved, as indicated by faunal and lithologic indices. Interglacial-aged sediments show poorer preservation. The -100-k.y. cycles are superimposed upon the long-term Brunhes Dissolution Cycle. This cycle is characterized by an interval of poor preservation centered between 400 and 550 ka and is bounded by good preservation events at 25 ... : Depth, sediment (m) is composite depth (mcd). Ashlayer A between 1.61 to 1.81 mcd samples 121-758A-1H-2,11; 121-758A-1H-2,21; 121-758A-1H-2,31. Ashlayer B at 2.01 mcd sample 121-758A-1H-2,51. Ashlayer C at 8.53 mcd sample 121-758A-2H-1,111. Ashlayer D between 12.23 and 12.33 mcd samples 121-758A-2H-4,31 and 121-758A-2H-4,41. ...