(Supplement S1) Silicon oxide and Potassium + Sodium oxide from the PACManus hydrothermal area


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.

Supplement to: Thal, Janis; Tivey, Maurice; Yoerger, Dana; Jöns, Niels; Bach, Wolfgang (2014): Geologic setting of PACManus hydrothermal area — High resolution mapping and in situ observations. Marine Geology, 355, 98-114

DOI https://doi.org/10.1594/PANGAEA.855519
Related Identifier IsSupplementTo https://doi.org/10.1016/j.margeo.2014.05.011
Related Identifier References https://doi.org/10.1016/j.jvolgeores.2006.08.007
Related Identifier References https://doi.org/10.2113/gsecongeo.101.3.633
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.855519
Creator Thal, Janis ORCID logo; Tivey, Maurice ORCID logo; Yoerger, Dana; Jöns, Niels ORCID logo; Bach, Wolfgang ORCID logo
Publisher PANGAEA
Contributor MARUM - Center for Marine Environmental Sciences, University Bremen
Publication Year 2015
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 116 data points
Discipline Earth System Research
Spatial Coverage (151.000W, -3.750S, 151.677E, -3.721N); Bismarck Sea; Manus Basin; Eastern Manus Basin
Temporal Coverage Begin 2000-11-18T17:30:00Z
Temporal Coverage End 2011-07-06T10:30:00Z