Program and Agenda

Abstract

GRAVITY ANOMALY INVESTIGATION ON THE FORMATION AND EVOLUTION OF THE HAWAIIAN JURASSIC QUIET ZONE UPPER OCEANIC LITHOSPHERE

We investigate the formation and evolution of the Mid-Jurassic to Early Cretaceous Hawaiian oceanic basin using shipboard gravity data collected during cruise TN272 along with multibeam bathymetry, sea-surface towed magnetic, and reflection seismic data. Our survey track lines cover an 800-km long, 145-170 Ma age transect corridor located within the Hawaiian M-sequence magnetic lineations. Within this corridor the seafloor is generally flat, the seamount population is minimal, and water depth exceeds 5200 m. Observed free-air gravity anomalies range ±20 mGal. We conducted 2-D gravity forward modeling to characterize the anomaly source. Results suggest that the transect can be divided into four zones based on a combination of thickness variations in the sediment and upper crust and the Moho depth: (a) M19-M26 – a zone of constant crustal thickness with variations in sediment thickness; (b) M27-M33 – a zone of thick sediment overlying deep faulted boundaries within the crust, buried seamounts, and/or variable Moho depth; (c) M34-M42 – a zone of thick, elevated volcanic crust (“bulge”) with constant Moho depth; and (d) M43-M44 – a zone of constant thickness crust with seamounts and thin sediment.

ePoster: https://www.msu.edu/~tominaga/research_jura.html

Authors

Hart, L. A., Michigan State University, USA, hartlane@msu.edu

Tominaga, M., Michigan State University, USA, tominaga@msu.edu

Tivey, M. A., Woods Hole Oceanographic Inst., USA, mtivey@whoi.edu

Kinsey, J. C., Woods Hole Oceanographic Inst., USA, jkinsey@whoi.edu

Sager, W. W., University of Houston, USA, wwsager@uh.edu

Details

Poster presentation

Session #:164
Date: 2/24/2014
Time: 16:00 - 18:00
Location: Poster/Exhibit Hall

Presentation is given by student: Yes

PosterID: 449