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Thal, Janis; Tivey, Maurice; Yoerger, Dana; Jöns, Niels; Bach, Wolfgang (2015): (Supplement S1) Silicon oxide and Potassium + Sodium oxide from the PACManus hydrothermal area. MARUM - Center for Marine Environmental Sciences, University Bremen, PANGAEA, https://doi.org/10.1594/PANGAEA.855519, Supplement to: Thal, J et al. (2014): Geologic setting of PACManus hydrothermal area — High resolution mapping and in situ observations. Marine Geology, 355, 98-114, https://doi.org/10.1016/j.margeo.2014.05.011

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Abstract:
This study presents a systematic analysis and interpretation of autonomous underwater vehicle-based microbathymetry combined with remotely operated vehicle (ROV) video recordings, rock analyses and temperaturemeasurements within the PACManus hydrothermal area located on Pual Ridge in the Bismarck Sea of eastern Manus Basin. The data obtained during research cruise Magellan-06 and So-216 provides a framework for understanding the relationship between the volcanism, tectonismand hydrothermal activity. PACManus is a submarine felsic vocanically-hosted hydrothermal area that hosts multiple vent fields locatedwithin several hundredmeters of one another but with different fluid chemistries, vent temperatures and morphologies. The total area of hydrothermal activity is estimated to be 20,279m**2. Themicrobathymetrymaps combinedwith the ROV video observations allow for precise high-resolution mapping estimates of the areal extents of hydrothermal activity.We find the distribution of hydrothermal fields in the PACManus area is primarily controlled by volcanic features that include lava domes, thick andmassive blocky lava flows, breccias and feeder dykes. Spatial variation in the permeability of local volcanic facies appears to control the distribution of venting within a field.We define a three-stage chronological sequence for the volcanic evolution of the PACManus based on lava flow morphology, sediment cover and lava SiO2 concentration. In Stage-1, sparsely to moderately porphyritic dacite lavas (68-69.8 wt.% SiO2) erupted to form domes or cryptodomes. In Stage-2, aphyric lava with slightly lower SiO2 concentrations (67.2-67.9 wt.% SiO2) formed jumbled and pillowed lava flows. In the most recent phase Stage-3, massive blocky lavaswith 69 to 72.5wt.% SiO2were erupted throughmultiple vents constructing a volcanic ridge identified as the PACManus neovolcanic zone. The transition between these stages may be gradual and related to progressive heating of a silicic magma following a recharge event of hot, mantle-derived melts.
Related to:
Monecke, Thomas; Giorgetti, Giovanna; Scholtysek, O; Kleeberg, Reinhard; Götze, J; Hannington, Mark D; Petersen, Sven (2007): Textural and mineralogical changes associated with the incipient hydrothermal alteration of glassy dacite at the submarine PACMANUS hydrothermal system, eastern Manus Basin. Journal of Volcanology and Geothermal Research, 160(1-2), 23-41, https://doi.org/10.1016/j.jvolgeores.2006.08.007
Paulick, Holger (2006): Phyllosilicate Alteration Mineral Assemblages in the Active Subsea-Floor Pacmanus Hydrothermal System, Papua New Guinea, ODP Leg 193. Economic Geology, 101(3), 633-650, https://doi.org/10.2113/gsecongeo.101.3.633
Coverage:
Median Latitude: -3.738083 * Median Longitude: 151.336199 * South-bound Latitude: -3.750000 * West-bound Longitude: 151.000000 * North-bound Latitude: -3.720700 * East-bound Longitude: 151.676800
Date/Time Start: 2000-11-18T17:30:00 * Date/Time End: 2011-07-06T10:30:00
Minimum Elevation: -1738.2 m * Maximum Elevation: -1619.3 m
Event(s):
193-1188A * Latitude: -3.728300 * Longitude: 151.669900 * Date/Time Start: 2000-11-18T17:30:00 * Date/Time End: 2000-11-22T08:30:00 * Elevation: -1640.2 m * Penetration: 211.6 m * Recovery: 21.93 m * Location: Bismarck Sea * Campaign: Leg193 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 23 cores; 211.6 m cored; 0 m drilled; 10.4 % recovery
193-1189A * Latitude: -3.720700 * Longitude: 151.674900 * Date/Time Start: 2000-11-22T08:30:00 * Date/Time End: 2000-11-23T20:45:00 * Elevation: -1690.2 m * Penetration: 125.8 m * Recovery: 8.58 m * Location: Bismarck Sea * Campaign: Leg193 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 13 cores; 125.8 m cored; 0 m drilled; 6.8 % recovery
193-1190C * Latitude: -3.721730 * Longitude: 151.676800 * Date/Time Start: 2000-11-24T11:00:00 * Date/Time End: 2000-11-25T05:30:00 * Elevation: -1696.1 m * Penetration: 17.2 m * Recovery: 0.4 m * Location: Bismarck Sea * Campaign: Leg193 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 3 cores; 17.2 m cored; 0 m drilled; 2.3 % recovery
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventThal, Janis
2Date/Time of eventDate/TimeThal, Janis
3Latitude of eventLatitudeThal, Janis
4Longitude of eventLongitudeThal, Janis
5Method/Device of eventMethod/DeviceThal, Janis
6Reference of dataRef dataThal, Janis
7Sample code/labelSample labelThal, Janis
8LocationLocationThal, Janis
9Silicon dioxideSiO2%Thal, JanisElectron microprobe JEOL JXA 8900R
10Silicon dioxideSiO2%Thal, JanisElectron microprobe JEOL JXA 8900R
11Potassium oxide + Sodium oxideK2O + Na2O%Thal, JanisElectron microprobe JEOL JXA 8900R
12Potassium oxide + Sodium oxideK2O + Na2O%Thal, JanisElectron microprobe JEOL JXA 8900R
Size:
116 data points

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