Emplacement and inflation structures of submarine and subaerial from Hawaii

Umino, Susumu; Obata, Sumie; Lipman, Peter W.; Smith, John R.; Shibata, Tsugio; Naka, Jiro; Trusdell, Frank A.

doi:10.1029/gm128p0085

Cited by 18 publications

(39 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Structural analysis of the basal crust of the ponded flow indicates that it was erupted from an off-axial vent nearby [Crispini et al, 2006]. The lavas directly underlying the ponded flow display rare subvertical hyaloclastite-filled inflation structures, indicative of eruption onto a near horizontal surface [e.g., Umino et al, 2002], and are interpreted to have also solidified off axis. Sheet flows with subordinate massive (>3 m thick) flows make up the bulk of the extrusive section (533.9 to 1004.1 mbsf-C).…”

Section: Odp Hole 1256d Drilling Resultsmentioning

confidence: 99%

Lava deposition history in ODP Hole 1256D: Insights from log‐based volcanostratigraphy

Tominaga

Umino

2010

Geochem Geophys Geosyst

Self Cite

View full text Add to dashboard Cite

[1] A log-based volcanic stratigraphy of Ocean Drilling Program Hole 1256D provides a vertical crosssection view of in situ upper crust formed at the East Pacific Rise (EPR) with unprecedented resolution. This stratigraphy model comprises ten electrofacies, principally identified from formation microscanner images. In this study, we build a lava flow stratigraphy model for the extrusive section in Hole 1256D by correlating these electrofacies with observations of flow types from the modern EPR, such as sheet flows and breccias, and pillow lavas and their distribution. The resulting flow stratigraphy model for the Hole 1256D extrusive section represents the first realization of detailed in situ EPR upper oceanic crust construction processes that have been detected only indirectly from remote geophysical data. We correlated the flow stratigraphy model with surface geology observed from the southern EPR (14°S) by Shinkai 6500 dives in order to obtain the relationship between lava flow types and ridge axis-ridge slope morphology. This dive information was also used to give a spatial-time reference frame for modeling lava deposition history in Hole 1256D. In reconstructing the lava deposition history, we interpreted that the origins of the ∼100 m thick intervals with abundant pillow lavas in Hole 1256D are within the axial slope where pillow lavas were observed during the Shinkai 6500 dives and previous EPR surveys. This correlation could constrain the lava deposition history in Hole 1256D crust. Using the lateral scale of ridge axis-ridge slope topography from the Shinkai 6500 observations and assuming the paleospreading rate was constant, 50% of the extrusive rocks in Hole 1256D crust were formed within ∼2000 m of the ridge axis, whereas nearly all of the remaining extrusive section was formed within ∼3000 m of the ridge axis. These results are consistent with the upper crustal construction model previously suggested by seismic studies.

show abstract

Section: Odp Hole 1256d Drilling Resultsmentioning

confidence: 99%

Lava deposition history in ODP Hole 1256D: Insights from log‐based volcanostratigraphy

Tominaga

Umino

2010

Geochem Geophys Geosyst

Self Cite

View full text Add to dashboard Cite

show abstract

“…3e) breccia is cut by NE-dipping boninite dikes. The dominant occurrence of flat pahoehoe lobes suggest the pre-existence of subhorizontal topography (Umino et al, 2002). The volcanic facies recognized in the upper section of the lower volcanic unit (agglutinate, scoria and spatter deposits surrounding fissure vent) are characteristic of intermittent Strombolian to Hawaiian fire fountaining.…”

Section: Volcanic Geologymentioning

confidence: 97%

“…In order of ascending stratigraphic level, the lower basaltic andesite-andesite unit consists of tuff breccia with block-sized pyroclasts, subaqueous pahoehoe lava flows with ropy wrinkles and stretched vesicles on lobe crust 30 (Umino et al, 2002;Umino et al, 2000) (Fig. 3f), moderately welded agglutinate, welded scoria and spatter deposits marginal to a NW-SE trending fissure vent, and an uppermost fall-out deposit of glassy lapilli tuff (Fig.…”

Section: Volcanic Geologymentioning

confidence: 99%

Boninite and boninite-series volcanics in northern Zambales ophiolite: Doubly-vergent subduction initiation along Philippine Sea Plate margins

Perez¹,

Umino²,

Yumul³

et al. 2018

Preprint

Self Cite

View full text Add to dashboard Cite

Abstract.A key component of subduction initiation rock suites is boninite, a high-magnesium andesite that is uniquely predominant in Western Pacific forearc terranes and in select Tethyan ophiolites such as Oman and Troodos. We report the discovery of low-calcium, high-silica boninite in the middle Eocene Zambales ophiolite (Luzon island, Philippines). Olivine-15 orthopyroxene microphyric high-silica boninite, olivine-clinopyroxene-phyric low-silica boninite and boninitic basalt occur Paleolatitudes derived from tilt-corrected sites in the Acoje Block place the juvenile arc of northern Zambales ophiolite in 25 the western margin of the Philippine Sea Plate. In this scenario, the origin of Philippine Sea Plate boninites (IBM and Zambales) would be in a doubly-vergent subduction initiation setting.

show abstract

“…Although rocks exhibiting a number of eruptive styles are included here, the criterion for subdivision is the occurrence of subvertical elongate fractures filled with quenched glass and hyaloclastite (e.g., Sections 206-1256D-21R-1 and 40R-1) at the top of the lava flows. These features indicate flow-lobe inflation that requires eruption onto a subhorizontal surface at less than a few degrees (Umino et al, 2000(Umino et al, , 2002, suggesting offaxial flows.…”

Section: Inflated Flowsmentioning

confidence: 99%

“…These features indicate flow-lobe inflation, which requires eruption onto a subhorizontal surface with less than a few degrees slope (Umino et al, 2000(Umino et al, , 2002; therefore, it is unlikely that such lavas formed on the ridge slope. Such inflation features are not observed in cores deeper in Hole 1256D.…”

Section: Expedition 309/312 Scientists Expedition 309/312 Summarymentioning

confidence: 99%