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Fluid-Mobile Trace Element Variability Of Serpentinites And Entrained Crustal Rocks Across The Mariana Forearc System, Raymond M. Johnston

USF Tampa Graduate Theses and Dissertations

In the Mariana subduction system, active serpentinite mud volcanoes are associated with the subduction of the Pacific plate beneath the Philippine plate in a non-accretionary convergent plate margin. This location offers a unique opportunity to study the subduction zone interface with little crustal contamination. The systematics of fluid-mobile trace elements (FME) (As, Cs, Rb, Sb, Tl, Pb, and Sr) in erupted serpentinite muds and entrained serpentinized ultramafic and mafic clasts can place constraints on the release of slab-derived fluids from the downgoing plate, and ultimately the pressure/temperature (P/TC°) conditions at which these fluids are mobilized.

The samples analyzed in this …

Expedition 374 Summary, Robert M. Mckay, Laura De Santis, Denise K. Kulhanek, Imogen M. Browne, Amelia E. Shevenell, Expedition 374 Scientists

Marine Science Faculty Publications

The marine-based West Antarctic Ice Sheet (WAIS) is currently locally retreating because of shifting wind-driven oceanic currents that transport warm waters toward the ice margin, resulting in ice shelf thinning and accelerated mass loss. Previous results from geologic drilling on Antarctica’s continental margins show significant variability in ice sheet extent during the late Neogene and Quaternary. Climate and ice sheet models indicate a fundamental role for oceanic heat in controlling ice sheet variability over at least the past 20 My. Although evidence for past ice sheet variability is available from ice-proximal marine settings, sedimentary sequences from the continental shelf and …

Site U1525, Robert M. Mckay, Laura De Santis, Denise K. Kulhanek, Imogen M. Browne, Amelia E. Shevenell, Expedition 374 Scientists

Marine Science Faculty Publications

No abstract provided.

Expedition 374 Methods, Robert M. Mckay, Laura De Santis, Denise K. Kulhanek, Imogen M. Browne, Amelia E. Shevenell, Expedition 374 Scientists

Marine Science Faculty Publications

This chapter documents the procedures and methods employed during drilling operations and in the shipboard laboratories on the R/V JOIDES Resolution during International Ocean Discovery Program (IODP) Expedition 374. This information applies only to the shipboard work described in the Expedition Reports section of the Expedition 374 Proceedings of the International Ocean Discovery Programvolume. Methods used by investigators for shore-based analyses of Expedition 374 data and samples will be described in separate individual publications. This introductory section provides an overview of drilling and coring operations, core handling, curatorial conventions, depth scale terminology, and the sequence of shipboard analyses. Subsequent …

Site U1523, Robert M. Mckay, Laura De Santis, Denise K. Kulhanek, Imogen M. Browne, Amelia E. Shevenell, Expedition 374 Scientists

Marine Science Faculty Publications

No abstract provided.

Site U1522, Robert M. Mckay, Laura De Santis, Denise K. Kulhanek, Imogen M. Browne, Amelia E. Shevenell, Expedition 374 Scientists

Marine Science Faculty Publications

No abstract provided.

Site U1521, Robert M. Mckay, Laura De Santis, Denise K. Kulhanek, Imogen M. Browne, Amelia E. Shevenell, Expedition 374 Scientists

Marine Science Faculty Publications

No abstract provided.

Site U1524, Robert M. Mckay, Laura De Santis, Denise K. Kulhanek, Imogen M. Browne, Amelia E. Shevenell, Expedition 374 Scientists

Marine Science Faculty Publications

No abstract provided.