Chen, Min-Te; Farrell, John W (1991): Relative abundances of planktonic foraminifera in ODP Site 121-758 (Table 1) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.728968, Supplement to: Chen, M-T; Farrell, JW (1991): Planktonic foraminifer faunal variations in the northeastern Indian Ocean: a high-resolution record of the past 800,000 years from Site 758. In: Weissel, J; Peirce, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 121, 125-140, https://doi.org/10.2973/odp.proc.sr.121.174.1991
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Abstract:
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 and 750 ka. Ecological factors also control variations in the foraminifer fauna. Changes in ecology are inferred from downcore fluctuations in the relative abundances of foraminifer species that have a similar level of resistance to dissolution. We focus on three species (Neogloboquadrina dutertrei, Pulleniatina obliquiloculata, Globorotalia menardii) with a relatively high resistance to dissolution. The long-term increase in N. dutertrei since at least 800 ka is interpreted as either a gradual decrease in the sea-surface salinity, or an increase in the biogenic productivity of the surface waters. These factors may be controlled by the strength of the monsoon climate. Extremely high abundances of P. obliquiloculata are observed in certain downcore intervals and are interpreted as times when the surface water conditions in the northeast Indian Ocean were similar to those in the modern western tropical Pacific, but not the modern Indian Ocean.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 5.384067 * Longitude: 90.361167
Date/Time Start: 1988-06-15T00:00:00 * Date/Time End: 1988-06-15T00:00:00
Minimum DEPTH, sediment/rock: 0.01 m * Maximum DEPTH, sediment/rock: 13.83 m
Event(s):
121-758 * Latitude: 5.384067 * Longitude: 90.361167 * Date/Time Start: 1988-06-15T00:00:00 * Date/Time End: 1988-06-15T00:00:00 * Elevation: -2935.0 m * Penetration: 782.2 m * Recovery: 561.9 m * Location: Indian Ocean * Campaign: Leg121 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 84 cores; 782.2 m cored; 0 m drilled; 71.8% recovery
Comment:
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.
Parameter(s):
# | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
---|---|---|---|---|---|---|
1 | Sample code/label | Sample label | Chen, Min-Te | DSDP/ODP/IODP sample designation | ||
2 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
3 | AGE | Age | ka BP | Geocode | ||
4 | Orbulina universa | O. universa | % | Chen, Min-Te | Counting >150 µm fraction | |
5 | Globigerinoides conglobatus | G. conglobatus | % | Chen, Min-Te | Counting >150 µm fraction | |
6 | Globigerinoides ruber | G. ruber | % | Chen, Min-Te | Counting >150 µm fraction | |
7 | Globigerinoides tenellus | G. tenellus | % | Chen, Min-Te | Counting >150 µm fraction | |
8 | Globigerinoides sacculifer | G. sacculifer | % | Chen, Min-Te | Counting >150 µm fraction | |
9 | Sphaeroidinella dehiscens | S. dehiscens | % | Chen, Min-Te | Counting >150 µm fraction | |
10 | Globigerinella aequilateralis | G. aequilateralis | % | Chen, Min-Te | Counting >150 µm fraction | |
11 | Globigerina calida | G. calida | % | Chen, Min-Te | Counting >150 µm fraction | |
12 | Globigerina bulloides | G. bulloides | % | Chen, Min-Te | Counting >150 µm fraction | |
13 | Globigerina falconensis | G. falconensis | % | Chen, Min-Te | Counting >150 µm fraction | |
14 | Globigerina digitata | G. digitata | % | Chen, Min-Te | Counting >150 µm fraction | |
15 | Globigerina rubescens | G. rubescens | % | Chen, Min-Te | Counting >150 µm fraction | |
16 | Globigerina pachyderma dextral | G. pachyderma d | % | Chen, Min-Te | Counting >150 µm fraction | |
17 | Neogloboquadrina dutertrei | N. dutertrei | % | Chen, Min-Te | Counting >150 µm fraction | |
18 | Globoquadrina conglomerata | G. conglomerata | % | Chen, Min-Te | Counting >150 µm fraction | |
19 | Globoquadrina hexagona | G. hexagona | % | Chen, Min-Te | Counting >150 µm fraction | |
20 | Pulleniatina obliquiloculata | P. obliquiloculata | % | Chen, Min-Te | Counting >150 µm fraction | |
21 | Globorotalia inflata | G. inflata | % | Chen, Min-Te | Counting >150 µm fraction | |
22 | Globorotalia truncatulinoides sinistral | G. truncatulinoides s | % | Chen, Min-Te | Counting >150 µm fraction | |
23 | Globorotalia truncatulinoides dextral | G. truncatulinoides d | % | Chen, Min-Te | Counting >150 µm fraction | |
24 | Globorotalia crassaformis | G. crassaformis | % | Chen, Min-Te | Counting >150 µm fraction | |
25 | Neogloboquadrina pachyderma dextral and dutertrei intergrade | P/D int | % | Chen, Min-Te | Counting >150 µm fraction | |
26 | Globorotalia hirsuta | G. hirsuta | % | Chen, Min-Te | Counting >150 µm fraction | |
27 | Globorotalia scitula | G. scitula | % | Chen, Min-Te | Counting >150 µm fraction | |
28 | Globorotalia menardii | G. menardii | % | Chen, Min-Te | Counting >150 µm fraction | |
29 | Globorotalia tumida | G. tumida | % | Chen, Min-Te | Counting >150 µm fraction | |
30 | Globigerinita glutinata | G. glutinata | % | Chen, Min-Te | Counting >150 µm fraction |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
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