(Supplement S1) Silicon oxide and Potassium + Sodium oxide from the PACManus hydrothermal area
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2015
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| _version_ | 1867170988037242880 |
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| author | Thal, Janis Tivey, Maurice Yoerger, Dana Jöns, Niels Bach, Wolfgang |
| author_facet | Thal, Janis Tivey, Maurice Yoerger, Dana Jöns, Niels Bach, Wolfgang |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_855519 |
| institution | PANGAEA |
| language | en |
| publishDate | 2015 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Supplement S1) Silicon oxide and Potassium + Sodium oxide from the PACManus hydrothermal area Thal, Janis Tivey, Maurice Yoerger, Dana Jöns, Niels Bach, Wolfgang 193-1188A; 193-1189A; 193-1190C; 193-1191A; BAMBUS; Bismarck Sea; CONDRILL; Date/Time of event; DRILL; Drilling/drill rig; Eastern Manus Basin; Electron microprobe JEOL JXA 8900R; Event label; J2-208; J2-209; J2-210; J2-211; J2-212; J2-213; J2-214; J2-216; J2-222; Joides Resolution; Latitude of event; Leg193; Location; Longitude of event; MAGELLAN-06; Manus Basin; Melville; Method/Device of event; MGLN06MV; Potassium oxide and Sodium oxide; Reference of data; Remote operated vehicle; Remote operated vehicle Jason II; ROV; ROVJ; Sample code/label; Silicon dioxide; SO166; SO166_58GTV; SO216; SO216-41-1; SO216-43-1; Sonne; Television-Grab; TVG 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. |
| title | (Supplement S1) Silicon oxide and Potassium + Sodium oxide from the PACManus hydrothermal area |
| topic | 193-1188A; 193-1189A; 193-1190C; 193-1191A; BAMBUS; Bismarck Sea; CONDRILL; Date/Time of event; DRILL; Drilling/drill rig; Eastern Manus Basin; Electron microprobe JEOL JXA 8900R; Event label; J2-208; J2-209; J2-210; J2-211; J2-212; J2-213; J2-214; J2-216; J2-222; Joides Resolution; Latitude of event; Leg193; Location; Longitude of event; MAGELLAN-06; Manus Basin; Melville; Method/Device of event; MGLN06MV; Potassium oxide and Sodium oxide; Reference of data; Remote operated vehicle; Remote operated vehicle Jason II; ROV; ROVJ; Sample code/label; Silicon dioxide; SO166; SO166_58GTV; SO216; SO216-41-1; SO216-43-1; Sonne; Television-Grab; TVG |
| url | https://doi.org/10.1594/PANGAEA.855519 |