Madagascar Holocene Stalagmite Stable Isotope Data Voarintsoa, N.R.G.; Railsback, L.B.; Brook, G.A.; Wang, L.; Kathayat, G.; Cheng, H.; Li, X.; Edwards, R.L.; Rakotondrazafy, A.F.M.; Madison Razanatseheno, M.O. Voarintsoa, N.R.G. Railsback, L.B. Brook, G.A. Wang, L. Kathayat, G. Cheng, H. Li, X. Edwards, R.L. Rakotondrazafy, A.F.M. Madison Razanatseheno, M.O. earth science/paleoclimate/speleothems (depth,null,null,millimeter,null,speleothems,null,null,N,Distance from the top of the stalagmite) earth science/paleoclimate/speleothems (age,null,null,calendar year before present,null,speleothems,null,null,N,null) earth science/paleoclimate/speleothems (sample identification,null,null,null,null,speleothems,null,null,C,null) earth science/paleoclimate/speleothems (delta 18O,calcium carbonate,null,per mil VPDB,null,speleothems,raw,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/speleothems (notes,null,null,null,null,speleothems,null,null,C,Nature of the spelean minerals (A= aragonite; C= calcite; A-C= mixture of aragonite and calcite - see papers for details)) earth science/paleoclimate/speleothems (delta 13C,calcium carbonate,null,per mil VPDB,null,speleothems,raw,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/speleothems (delta 13C,calcium carbonate,null,per mil VPDB,null,speleothems,corrected,isotope ratio mass spectrometry,N,transformed = d13Craw – [RA/C x 1.7] where A= aragonite and C= calcite) earth science/paleoclimate/speleothems (delta 18O,calcium carbonate,null,per mil VPDB,null,speleothems,corrected,isotope ratio mass spectrometry,N,transformed = d18Oraw – [RA/C x 0.8] where A= aragonite and C= calcite) earth science/paleoclimate/speleothems earth science/paleoclimate/speleothems (Anjohibe Cave>LATITUDE -15.53>LONGITUDE 46.88) (Anjokipoty Cave>LATITUDE -15.57839>LONGITUDE 46.73436) Petrographic features, mineralogy, and stable isotopes from two stalagmites, ANJB-2 and MAJ-5, respectively from Anjohibe and Anjokipoty caves, allow distinction of three intervals of the Holocene in NW Madagascar. The Malagasy early Holocene (between ca. 9.8 and 7.8ka) and late Holocene (after ca. 1.6ka) intervals (MEHI and MLHI, respectively) record evidence of stalagmite deposition. The Malagasy middle Holocene interval (MMHI, between ca. 7.8 and 1.6ka) is marked by a depositional hiatus of ca. 6500 years. Deposition of these stalagmites indicates that the two caves were sufficiently supplied with water to allow stalagmite formation. This suggests that the MEHI and MLHI intervals may have been comparatively wet in NW Madagascar. In contrast, the long-term depositional hiatus during the MMHI implies it was relatively drier than the MEHI and the MLHI. The alternating wet-dry-wet conditions during the Holocene may have been linked to the long-term migrations of the Intertropical Convergence Zone (ITCZ). When the ITCZ's mean position is farther south, NW Madagascar experiences wetter conditions, such as during the MEHI and MLHI, and when it moves north, NW Madagascar climate becomes drier, such as during the MMHI. A similar wet-dry-wet succession during the Holocene has been reported in neighboring locations, such as southeastern Africa. Beyond these three subdivisions, the records also suggest wet conditions around the cold 8.2ka event, suggesting a causal relationship. However, additional Southern Hemisphere high-resolution data will be needed to confirm this. STUDY NOTES: Stalagmite stable isotope (d18O and d13C) data from Anjohibe and Anjokipoty Caves, Madagascar for the past 10,000 years. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Voarintsoa, N.R.G. Investigator : Railsback, L.B. Investigator : Brook, G.A. Investigator : Wang, L. Investigator : Kathayat, G. Investigator : Cheng, H. Investigator : Li, X. Investigator : Edwards, R.L. Investigator : Rakotondrazafy, A.F.M. Investigator : Madison Razanatseheno, M.O. 2017-10-29 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/22970 https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/anjohibe2017c.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/anjokipoty2017.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/anjohibe2017c.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/anjokipoty2017.txt English https://www.ncdc.noaa.gov/paleo/study/22970 https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/anjohibe2017c.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/anjokipoty2017.txt Ny Riavo Gilbertinie Voarintsoa, Loren Bruce Railsback, George Albert Brook, Lixin Wang, Gayatri Kathayat, Hai Cheng, Xianglei Li, Richard Lawrence Edwards, Amos Fety Michel Rakotondrazafy, and Marie Olga Madison Razanatseheno2017Three distinct Holocene intervals of stalagmite deposition and nondeposition revealed in NW Madagascar, and their paleoclimate implicationsClimate of the Past13121771-179010.5194/cp-13-1771-2017https://www.clim-past.net/13/1771/2017/ START YEAR: 9880 cal yr BP * END YEAR: 140 cal yr BP 46.73436 -15.57839 46.88 -15.53