Benthic and planktic foraminiferal Mg/Ca, Ba/Ca and local seawater d18O estimates ...

• Main Authors: Yang, Xueping, Groeneveld, Jeroen, Jian, Zhimin, Steinke, Stephan, Giosan, Liviu
• Format: Dataset
• Language: English
• Published: PANGAEA 2020
• Subjects: AGE; DEPTH, sediment/rock; Foraminifera, benthic; Foraminifera, benthic δ18O; Trilobatus sacculifer, δ18O; Trilobatus sacculifer, Manganese/Calcium ratio; Trilobatus sacculifer, Barium/Calcium ratio; Sea surface temperature; δ18O, seawater, reconstructed; Fragmentation index, planktic foraminifera; Core drilling; Mass spectrometer, Finnigan, MAT253; connected with Automatic carbonate preparation line, Finnigan, Kiel III; adjusted; ICP-MS Thermo X7; Calculated from Mg/Ca ratios Anand et al., 2003; Antarc*; Antarctic; Ice Sheet
• Online Access: https://dx.doi.org/10.1594/pangaea.910403; https://doi.pangaea.de/10.1594/PANGAEA.910403

During the middle Miocene, Earth's climate changed from a global warm period (Miocene Climatic Optimum) into a colder one with the expansion of the Antarctic ice sheet. This prominent climate transition was also a period of drastic changes in global atmospheric circulation. The development of the South Asian Monsoon (SAM) is not well understood and mainly derived from proxy records of wind strength. Proxy records for middle Miocene changes in rainfall are virtually non-existent for India and the Arabian Sea prior to 11 Ma. This study presents planktic foraminiferal trace element (Mg/Ca and Ba/Ca) and stable oxygen isotope records from NGHP-01 Site 01A off the coast of West India in the Eastern Arabian Sea (EAS) to reconstruct the regional surface hydrography and hydroclimate in the SAM region during the middle Miocene. The Ba/Ca and local seawater d18O (d18Osw) changes reveal a notable gradual increase in SAM rainfall intensity during the middle Miocene. Additionally to this long term increase in ... : - δ18O [‰ VPDB]. Benthic foraminifera Planulina wuellerstorfi and Cibicidoides mundulus, measured at the State Key Laboratory of Marine Geology, Tongji University, Shanghai, China using a Finnigan-MAT253 mass spectrometer connected with an automatic line for carbonate preparation (type “Kiel III”).- δ18O [‰ VPDB] adjusted. The benthic foraminiferal δ18O values are presented in “Uvigerina-scale” by adding 0.64‰ (Shackleton and Opdyke, 1973).- δ18O [‰ VPDB]. Planktic foraminifera Trilobatus sacculifer, measured at MARUM, University of Bremen, Germany, using a Finnigan MAT 251 mass spectrometer connected with an automatic line for carbonate preparation (type “Kiel III”)- Mg/Ca [mmol/mol]. Planktic foraminifera Trilobatus sacculifer. Measured with an ICP-MS (Thermo X7) at the State Key Laboratory of Marine Geology, Tongji University Shanghai, China. - Ba/Ca [µmol/mol]. Planktic foraminifera Trilobatus sacculifer. Measured with an ICP-MS (Thermo X7) at the State Key Laboratory of Marine Geology, Tongji University ...