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Articles 1 - 5 of 5
Full-Text Articles in Volcanology
Provenance, Composition And Transport Processes Of Pleistocene-Recent Turbidite Sediments Of The Se Nazca Plate, Odp Site 1232, Kimberly D. Beck
Provenance, Composition And Transport Processes Of Pleistocene-Recent Turbidite Sediments Of The Se Nazca Plate, Odp Site 1232, Kimberly D. Beck
FIU Electronic Theses and Dissertations
A 300 meter sequence of Pleistocene turbidite deposits was recovered on the Nazca Plate at the subducting edge of the Peru-Chile Trench at ODP Site 1232. Analysis of the coarsest particles in the turbidite sequences implies sediment was supplied in some proportion by terrestrial erosion and originated in the coastal, central, and Andean volcanic/magmatic belt which parallels the Southern Chilean coast, and the predominant material type is volcanic. Petrographic and geochemical analyses show that samples from 3 - 140 mbsf contain >43% fresh, angular glass. New calcareous nannofossil biostratigraphy brackets the sediment ages of the upper 288 m of cored …
Volcanic History Of The Izu Bonin Mariana Arc Prior To The First Arc Rift From Volcaniclastic Sediments Of Dsdp Site 296 And Iodp Site 1438, Eshita Samajpati
Volcanic History Of The Izu Bonin Mariana Arc Prior To The First Arc Rift From Volcaniclastic Sediments Of Dsdp Site 296 And Iodp Site 1438, Eshita Samajpati
FIU Electronic Theses and Dissertations
The Izu-Bonin Mariana (IBM) island arc in the western Pacific basin is a volcanic chain formed by subduction of the Pacific lithospheric plate beneath the Philippine Sea plate. Worldwide, subduction causes high-magnitude earthquakes and explosive volcanic activity in addition to forming the Earth’s continental crust and major ore deposits, thus its understanding is important to human concerns. In the IBM, volcanic activity spans 50 million years to the present and the arc has undergone extension and periodic rifting, preserving remnants of its early history. The Kyushu Palau ridge (KPR), an inactive Oligocene remnant of the rifted IBM system, is a …
Evaluation Of Pre-Eruptive Conditions For Cordon Caulle Rhyo-Dacitic Historic Eruptions, Mauro Andres Mingo
Evaluation Of Pre-Eruptive Conditions For Cordon Caulle Rhyo-Dacitic Historic Eruptions, Mauro Andres Mingo
FIU Electronic Theses and Dissertations
For better understanding of Plinian-hybrid eruptive events, I analyzed the variables that affect the pre-eruptive conditions of the latest three eruptive events of the Puyehue Cordon Caulle Volcanic Complex (PCCVC). The analysis was done by performing a petrological study of lava samples followed by Electron Probe Microanalysis (EPMA) on selected mineral phases. Mineral data were then used in established mathematical models to calculate pre-eruptive magma temperature and water content. The acquired data are compared to bulk measured water content, and the difference is utilized to estimate viscosities and evaluate the degassing regime. Results indicate that the historic eruptive events have …
Identifying The Origins Of Volcanic Ash Deposits Using Their Chemical And Physical Compositions, Emmanuel Soto
Identifying The Origins Of Volcanic Ash Deposits Using Their Chemical And Physical Compositions, Emmanuel Soto
FIU Electronic Theses and Dissertations
Recent ocean sediments collected offshore Chile by Ocean Drilling Program Leg 202 contained layers of volcanic ash of unknown origin. These deposits may have originated from sources in the Southern Volcanic Zone (SVZ) within the Andean Volcanic Belt to the east, or from explosive volcanoes in the southwestern Pacific transported by westerly prevailing winds. In this study, mineral and glass textures and compositions of Leg 202 ashes were evaluated to try to determine the sources of the ash layers. Ash fragments were imaged and analyzed for major elements using an SEM with X-Ray detector and for trace elements using LA-ICPMS. …
A Geochemical Study Of Crustal Plutonic Rocks From The Southern Mariana Trench Forearc: Relationship To Volcanic Rocks Erupted During Subduction Initiation, Julie A. Johnson
A Geochemical Study Of Crustal Plutonic Rocks From The Southern Mariana Trench Forearc: Relationship To Volcanic Rocks Erupted During Subduction Initiation, Julie A. Johnson
FIU Electronic Theses and Dissertations
Two suites of intermediate-felsic plutonic rocks were recovered by dredges RD63 and RD64 (R/V KK81-06-26) from the northern wall of the Mariana trench near Guam, which is located in the southern part of the Izu-Bonin-Mariana (IBM) island arc system. The locations of the dredges are significant as the area contains volcanic rocks (forearc basalts and boninites) that have been pivotal in explaining processes that occur when one lithospheric plate initially begins to subduct beneath another. The plutonic rocks have been classified based on petrologic and geochemical analyses, which provides insight to their origin and evolution in context of the surrounding …