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A summary of plate boundaries and igneous activity Type of boundarySurface featuresIgneous activityExamples Constructive OP Destructive CP-OP Destructive.

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Presentation on theme: "A summary of plate boundaries and igneous activity Type of boundarySurface featuresIgneous activityExamples Constructive OP Destructive CP-OP Destructive."— Presentation transcript:

1 A summary of plate boundaries and igneous activity Type of boundarySurface featuresIgneous activityExamples Constructive OP Destructive CP-OP Destructive OP-OP Destructive CP-CP Conservative

2 A summary of plate boundaries and igneous activity Type of boundarySurface featuresIgneous activityExamples Constructive OP Constructive CP Destructive CP-OP Destructive OP-OP Destructive CP-CP Conservative Oceanic ridge Basalt lavas – pillows (spilites – Na rich) Mid Atlantic Ridge, East Pacific Rise

3 A summary of plate boundaries and igneous activity Type of boundarySurface featuresIgneous activityExamples Constructive OP Constructive CP Destructive CP-OP Destructive OP-OP Destructive CP-CP Conservative Oceanic ridge Basalt lavas – pillows (spilites – Na rich) Mid Atlantic Ridge, East Pacific Rise Rift valley, normal fault scarps Basalt lavas East African Rift Valley

4 A summary of plate boundaries and igneous activity Type of boundarySurface featuresIgneous activityExamples Constructive OP Constructive CP Destructive CP-OP Destructive OP-OP Destructive CP-CP Conservative Rift valley, normal fault scarps Basalt lavas East African Rift Valley Oceanic ridge Basalt lavas – pillows (spilites – Na rich) Mid Atlantic Ridge, East Pacific Rise Ocean trench, fold mountain range Andesitic lavas Andes mountains

5 A summary of plate boundaries and igneous activity Type of boundarySurface featuresIgneous activityExamples Constructive OP Constructive CP Destructive CP-OP Destructive OP-OP Destructive CP-CP Conservative Oceanic ridge Basalt lavas – pillows (spilites – Na rich) Mid Atlantic Ridge, East Pacific Rise Rift valley, normal fault scarps Basalt lavas East African Rift Valley Ocean trench, fold mountain range Andesitic lavas Andes mountains Ocean trench, island arc Andesitic lavas Aleutians, Phillipines

6 A summary of plate boundaries and igneous activity Type of boundarySurface featuresIgneous activityExamples Constructive OP Constructive CP Destructive CP-OP Destructive OP-OP Destructive CP-CP Conservative Oceanic ridge Basalt lavas – pillows (spilites – Na rich) Mid Atlantic Ridge, East Pacific Rise Andesitic lavas Andes mountains Ocean trench, fold mountain range Rift valley, normal fault scarps Basalt lavas East African Rift Valley Ocean trench, island arc Andesitic lavas Aleutians, Phillipines Fold mountains Large granitic batholiths Himalayas

7 A summary of plate boundaries and igneous activity Type of boundarySurface featuresIgneous activityExamples Constructive OP Constructive CP Destructive CP-OP Destructive OP-OP Destructive CP-CP Conservative Oceanic ridge Basalt lavas – pillows (spilites – Na rich) Mid Atlantic Ridge, East Pacific Rise Ocean trench, fold mountain rge Andesitic lavas Andes mountains Rift valley, normal fault scarps Basalt lavas East African Rift Valley Ocean trench, island arc Andesitic lavas Aleutians, Phillipines Fold mountains Large granitic batholiths Himalayas Fault zoneNone San Andreas Fault

8 A summary of plate boundaries and igneous activity Type of boundarySurface featuresIgneous activityExamples Constructive OP Constructive CP Destructive CP-OP Destructive OP-OP Destructive CP-CP Conservative Ocean trench, fold mountain range Andesitic lavas Andes mountains Rift valley, normal fault scarps Basalt lavas East African Rift Valley Oceanic ridge Basalt lavas – pillows (spilites – Na rich) Mid Atlantic Ridge, East Pacific Rise Ocean trench, island arc Andesitic lavas Aleutians, Phillipines Fault zoneNone San Andreas Fault Fold mountains Large granitic batholiths Himalayas

9 Different environments and processes of magma formation generate different types of igneous rocks Key points : ie. melting of rock material at depth generates magmas within a number of different plate environments

10 AND : Partial melt of mantle rocks beneath CONSTRUCTIVE PLATE MARGINS generates BASALTIC magma; Near to DESTRUCTIVE PLATE MARGINS partial melt in and above the subductive oceanic lithosphere generates ANDESITIC magma; In mantle hot spots partial melt of mantle rocks above a mantle plume generates ANDESITIC magma; In deeply buried lower CONTINETAL CRUST during orogenies – melting of crust generates GRANITIC/ACIDIC/SILICIC magma.

11 Task : Using PHYSICAL GEOLOGY – Plummer & McGeary 1. Read Ch18 and Ch19 2. Ch 19 - Make additional notes and your own diagrams eg 19.12, 19.13, 19.20, 19.22, 19.26, Make notes on : Causes of plate motion p441; Mantle plumes p443; A cautionary note p445 and Summary p Be able to define all the “terms to remember on p448. Take PHYSICAL GEOLOGY home and use it for extra reading/note making. Start with Ch1 and 2 !!


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