Baumberger
Tamara
Baumberger
Tamara
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DatasetWater column analytical data from the Chile Triple Junction collected on two cruises aboard the R/V Melville during February-March 2010 and April 2012(Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2022-03-28) German, Christopher R. ; Baumberger, Tamara ; Saito, Mak A.The hydrothermal plume samples reported here were acquired aboard R/V Melville during two short cruises of opportunity conducted in 2010 (MV1003) and 2012 (MV1205). Surveys along the axis of the ridge-crest were conducted using the ship's Seabird 911+ CTD rosette. A combination of tow-yo, vertical casts, and "pogo" stations were employed. An ultra-short baseline (USBL) navigation beacon was attached to the CTD-rosette for all deployments to ensure that we could navigate precisely where all samples and ancillary data were collected, as well as their sample depths. For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/871203
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ArticleEruptive modes and hiatus of volcanism at West Mata seamount, NE Lau basin : 1996–2012(John Wiley & Sons, 2014-10-31) Embley, Robert W. ; Merle, Susan G. ; Baker, Edward T. ; Rubin, Kenneth H. ; Lupton, John E. ; Resing, Joseph A. ; Dziak, Robert P. ; Lilley, Marvin D. ; Chadwick, William W. ; Shank, Timothy M. ; Greene, Ronald ; Walker, Sharon L. ; Haxel, Joseph H. ; Olson, Eric J. ; Baumberger, TamaraWe present multiple lines of evidence for years to decade-long changes in the location and character of volcanic activity at West Mata seamount in the NE Lau basin over a 16 year period, and a hiatus in summit eruptions from early 2011 to at least September 2012. Boninite lava and pyroclasts were observed erupting from its summit in 2009, and hydroacoustic data from a succession of hydrophones moored nearby show near-continuous eruptive activity from January 2009 to early 2011. Successive differencing of seven multibeam bathymetric surveys of the volcano made in the 1996–2012 period reveals a pattern of extended constructional volcanism on the summit and northwest flank punctuated by eruptions along the volcano's WSW rift zone (WSWRZ). Away from the summit, the volumetrically largest eruption during the observational period occurred between May 2010 and November 2011 at ∼2920 m depth near the base of the WSWRZ. The (nearly) equally long ENE rift zone did not experience any volcanic activity during the 1996–2012 period. The cessation of summit volcanism recorded on the moored hydrophone was accompanied or followed by the formation of a small summit crater and a landslide on the eastern flank. Water column sensors, analysis of gas samples in the overlying hydrothermal plume and dives with a remotely operated vehicle in September 2012 confirmed that the summit eruption had ceased. Based on the historical eruption rates calculated using the bathymetric differencing technique, the volcano could be as young as several thousand years.
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ArticleHydrothermal exploration of the southern Chile Rise: sediment‐hosted venting at the Chile Triple Junction(American Geophysical Union, 2022-03-04) German, Christopher R. ; Baumberger, Tamara ; Lilley, Marvin D. ; Lupton, John E. ; Noble, Abigail E. ; Saito, Mak A. ; Thurber, Andrew R. ; Blackman, Donna K.We report results from a hydrothermal plume survey along the southernmost Chile Rise from the Guamblin Fracture Zone to the Chile Triple Junction (CTJ) encompassing two segments (93 km cumulative length) of intermediate spreading-rate mid-ocean ridge axis. Our approach used in situ water column sensing (CTD, optical clarity, redox disequilibrium) coupled with sampling for shipboard and shore based geochemical analyses (δ3He, CH4, total dissolvable iron (TDFe) and manganese, (TDMn)) to explore for evidence of seafloor hydrothermal venting. Across the entire survey, the only location at which evidence for submarine venting was detected was at the southernmost limit to the survey. There, the source of a dispersing hydrothermal plume was located at 46°16.5’S, 75°47.9’W, coincident with the CTJ itself. The plume exhibits anomalies in both δ3He and dissolved CH4 but no enrichments in TDFe or TDMn beyond what can be attributed to resuspension of sediments covering the seafloor where the ridge intersects the Chile margin. These results are indicative of sediment-hosted venting at the CTJ.