The last deglaciation in orca basin, gulf of Mexico: High-resolution planktonic foraminiferal changes

1985 ◽  
Vol 50 (1) ◽  
pp. 189-216 ◽  
Author(s):  
J.P. Kennett ◽  
K. Elmstrom ◽  
N. Penrose
Keyword(s):  
High Resolution ◽  
Gulf Of Mexico ◽  
Last Deglaciation ◽  
The Last Deglaciation ◽  
Orca Basin

Provenance of freshwater pulses in the Gulf of Mexico during the last deglaciation

2010 ◽  
Vol 74 (2) ◽  
pp. 235-245 ◽  
Author(s):  
T. Sionneau ◽  
V. Bout-Roumazeilles ◽  
B.P. Flower ◽  
A. Bory ◽  
N. Tribovillard ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Clay Mineralogy ◽  
Mineralogical Composition ◽  
Last Deglaciation ◽  
Distribution Maps ◽  
Drainage Patterns ◽  
Southeastern Margin ◽  
Southwestern Margin ◽  
The Last Deglaciation ◽  
Orca Basin

AbstractDuring the last deglaciation, the decaying Laurentide Ice Sheet (LIS) delivered huge volumes of meltwater toward the Gulf of Mexico. The present investigation of clay mineralogy and grain-size characteristics of terrigenous sediments deposited in the Orca Basin (Gulf of Mexico) offers a unique opportunity to link the marine record of these meltwater floods with the reconstructed continental glacial history and the modeled drainage patterns. Five peculiar sedimentary levels, characterized by high smectite content and low CaCO3 content, were identified and occurred simultaneously with major meltwater floods. According to recently published clay mineral distribution maps for North America, these results help to pinpoint the southwestern margin of the LIS as a main contributor to most of the meltwater discharges. In addition, the peculiar mineralogical composition (illite and chlorite-rich) of the sediments characterizing the meltwater episode associated with Heinrich event 1 suggests a provenance from the Great Lakes area, supporting the interpretation of destabilization of the LIS southeastern margin during this event. Decreased terrigenous contribution associated with changing provenance of sediments after 12.9 cal ka BP suggests strong modifications of the continental hydrography in relation to Lake Agassiz history and changes in the morphology of Mississippi delta due to rising sea level.

Differences among sub-orbital time scale events recorded in two high-resolution loess sections, China, during the last deglaciation

2009 ◽  
Vol 198 (1-2) ◽  
pp. 246-254 ◽  
Author(s):  
Qingyu Guan ◽  
Baotian Pan ◽  
Na Li ◽  
Hongshan Gao ◽  
Qiong Li ◽  
...  
Keyword(s):  
High Resolution ◽  
Time Scale ◽  
Last Deglaciation ◽  
The Last Deglaciation
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