Petrology – Chapter 9Gautam Sen

Flood Basalts & Hot Spot Tracks

“Plume Heads & Tail” Model

Central Atlantic Magmatic Province (CAMP)

Flood Basalts & Mass Extinctions

Columbia River Basalt

FeO* & TiO2 in Flood Basalt provinces

Continued…

Deccan Traps

Deccan Trap lava flows

India running over Reunion-Deccan plume at 68-65 Ma

Ages of Deccan Traps

Giant Plagioclase Basalt flows in the Western Ghats near Mumbai

Deccan Pyroxenes

TAS Diagram for Deccan

REE in Deccan Basalts

Deccan Nd-Sr Isotopes

Fe-rich Source for Deccan

Model for the Generation of Deccan Magmas

Columbia River Basalts

Cross-section of Pacific NW

Age of CRBG

CRBG: Volumes of Individual Formations estimated by Hooper

Spatial distribution of various CRBG formations

Major element composition

REE of CRBG

Isotopes of CRBG

Geist’s Model

Camp & Hanan Model for theOrigin of the CRBG