Control of insolation on stalagmite growth, rainfall, and migration of the tropical rain belt in northern Namibia over the last 100 kyr, as suggested by a rare MIS 5b-5c stalagmite from Dante Cave

L. Bruce Railsback, Susan Kraft, Fuyuan Liang, George A. Brook, Eugene Marais, Hai Cheng, R. Lawrence Edwards

Research output: Contribution to journalArticle

Abstract

Dating by the 230Th method indicates that Stalagmite DANf from Dante Cave in northern Namibia, in the Summer Rainfall Zone (SRZ) of southern Africa, formed about 92 ka, at the boundary of Marine Isotope Stages (MIS) 5b and 5c. In this dominantly semiarid zone, stalagmite growth may be evidence of a relatively wetter period, and trends in DANf's mineralogy and its C, O, and U isotope ratios further support formation in a period wetter than those before or after its formation. DANf's time of formation at 92 ka, like other wet periods in the SRZ of southern Africa over the most recent 100 kyr, coincides with a maximum in January insolation at 30°S that brought the SRZ, and more generally the tropical rain belt, farther south than before or after.

Original languageEnglish (US)
Article number109348
JournalPalaeogeography, Palaeoclimatology, Palaeoecology
Volume535
DOIs
StatePublished - Dec 1 2019

Fingerprint

stalagmite
marine isotope stage
Namibia
insolation
caves
cave
isotopes
solar radiation
rain
rainfall
Southern Africa
summer
mineralogy
semiarid zones
isotope

Keywords

  • Africa
  • MIS 5c
  • Orbital forcing
  • Pleistocene
  • Southern Hemisphere
  • Speleothem
  • Summer Rainfall Zone
  • Tropical rain belt

Cite this

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title = "Control of insolation on stalagmite growth, rainfall, and migration of the tropical rain belt in northern Namibia over the last 100 kyr, as suggested by a rare MIS 5b-5c stalagmite from Dante Cave",
abstract = "Dating by the 230Th method indicates that Stalagmite DANf from Dante Cave in northern Namibia, in the Summer Rainfall Zone (SRZ) of southern Africa, formed about 92 ka, at the boundary of Marine Isotope Stages (MIS) 5b and 5c. In this dominantly semiarid zone, stalagmite growth may be evidence of a relatively wetter period, and trends in DANf's mineralogy and its C, O, and U isotope ratios further support formation in a period wetter than those before or after its formation. DANf's time of formation at 92 ka, like other wet periods in the SRZ of southern Africa over the most recent 100 kyr, coincides with a maximum in January insolation at 30°S that brought the SRZ, and more generally the tropical rain belt, farther south than before or after.",
keywords = "Africa, MIS 5c, Orbital forcing, Pleistocene, Southern Hemisphere, Speleothem, Summer Rainfall Zone, Tropical rain belt",
author = "Railsback, {L. Bruce} and Susan Kraft and Fuyuan Liang and Brook, {George A.} and Eugene Marais and Hai Cheng and Edwards, {R. Lawrence}",
year = "2019",
month = "12",
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doi = "10.1016/j.palaeo.2019.109348",
language = "English (US)",
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journal = "Palaeogeography, Palaeoclimatology, Palaeoecology",
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TY - JOUR

T1 - Control of insolation on stalagmite growth, rainfall, and migration of the tropical rain belt in northern Namibia over the last 100 kyr, as suggested by a rare MIS 5b-5c stalagmite from Dante Cave

AU - Railsback, L. Bruce

AU - Kraft, Susan

AU - Liang, Fuyuan

AU - Brook, George A.

AU - Marais, Eugene

AU - Cheng, Hai

AU - Edwards, R. Lawrence

PY - 2019/12/1

Y1 - 2019/12/1

N2 - Dating by the 230Th method indicates that Stalagmite DANf from Dante Cave in northern Namibia, in the Summer Rainfall Zone (SRZ) of southern Africa, formed about 92 ka, at the boundary of Marine Isotope Stages (MIS) 5b and 5c. In this dominantly semiarid zone, stalagmite growth may be evidence of a relatively wetter period, and trends in DANf's mineralogy and its C, O, and U isotope ratios further support formation in a period wetter than those before or after its formation. DANf's time of formation at 92 ka, like other wet periods in the SRZ of southern Africa over the most recent 100 kyr, coincides with a maximum in January insolation at 30°S that brought the SRZ, and more generally the tropical rain belt, farther south than before or after.

AB - Dating by the 230Th method indicates that Stalagmite DANf from Dante Cave in northern Namibia, in the Summer Rainfall Zone (SRZ) of southern Africa, formed about 92 ka, at the boundary of Marine Isotope Stages (MIS) 5b and 5c. In this dominantly semiarid zone, stalagmite growth may be evidence of a relatively wetter period, and trends in DANf's mineralogy and its C, O, and U isotope ratios further support formation in a period wetter than those before or after its formation. DANf's time of formation at 92 ka, like other wet periods in the SRZ of southern Africa over the most recent 100 kyr, coincides with a maximum in January insolation at 30°S that brought the SRZ, and more generally the tropical rain belt, farther south than before or after.

KW - Africa

KW - MIS 5c

KW - Orbital forcing

KW - Pleistocene

KW - Southern Hemisphere

KW - Speleothem

KW - Summer Rainfall Zone

KW - Tropical rain belt

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