Petrology Chapter 8Gautam Sen

Plates & Mid-oceanic Ridges

Types of Spreading CenterRidge offset by aTransform fault

Overlapping Spreading Center

Continuous RidgeAxis with a smallbend

Relief map of EPR

REE in Basalts from MOR & Hawaii

Nd-Sr isotope composition of MORB vs. Hawaiian tholeiites

Iceland: located on the MOR system

Deeper Structure of a Fast Spreading Ridge

Deeper Structure of a Slow Spreading Ridge

Fractionation of MAR vs. EPR

Ridge evolution

Ridge extension & passive melting

Na8 Estimation

Na8 vs. Crustal thickness

Na8 vs. Fe8 Relationships

Generation of MORB: Thin Crust

Generation of MORB: Thick Crust

MORB Generation: Volatiles & Pyroxenite source considered

Melt Accumulation & Dispersal of residual mantle

Hawaii-Emperor Volcanic Chain

Tuzo Wilson’s Model: Origin of Hawaiian Chain

Growth stages of a Hawaiian volcano

Normative Composition of Hawaiian tholeiites & Alkalic lavas

MgO-TiO2: MORB vs. Hawaiian basalts

Pb-isotopes: Loa vs Kea Volcanoes

MORB vs. Hawaiian-Emperor Seamounts: Nd/Sr Isotopes

Hawaiian Mantle Xenoliths: P-T

Nd-Sr Isotope composition of Hawaiian spinel peridotite xenoliths and Lavas

Os-Hf Isotope composition of the xenoliths compared with lavas

Lithosphere beneath Oahu

Seismic Trace of the Hawaiian Hot Spot

FeO*-SiO2 of Hawaiian Tholeiites: Koolau is a special case

Hauri’s Zoned Plume Model

Sobolev: Arguments for a Ni-rich Pyroxenite in the source for Hawaiian magmas

Sobolev: Arguments for a Ni-rich Pyroxenite in the source for Hawaiian magmas - 2

Sobolev et al. Melting Model for Hawaii

P-T Conditions of multisaturation for Hawaii

Presnall’s mantle polybaric liquids and Hawaiian primitive glasses