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

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 preserva...

Full description

Bibliographic Details
Main Authors: Chen, Min-Te, Farrell, John W
Format: Dataset
Language:English
Published: PANGAEA 1991
Subjects:
AGE
Online Access:https://dx.doi.org/10.1594/pangaea.728968
https://doi.pangaea.de/10.1594/PANGAEA.728968
Description
Summary: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. ...