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WHAT HAPPENS WHEN PIECES OF THE CRUST ARE
FORCED TOGETHER ?
Extension andinjection of mantle material into crust
Extension andinjection of mantle material into crust
Extension andinjection of mantle material into crust
Extension andinjection of mantle material into crust
CrustalCompression
Extension andinjection of mantle material into crust
Extension andinjection of mantle material into crust
CrustalCompression
Consideration of Conservation of Mass:
Mass leaving MantleInjected to Crust.
Mass leaving MantleInjected to Crust.
Unless Crustal material is returned mantle in equal volume the Earth will
grow larger and larger, but also “hollower” and “hollower”.
?
CRUSTAL COMPRESSION
CRUSTAL COMPRESSION
CrustalThickening
CRUSTAL COMPRESSION
CrustalThickening
CRUSTAL COMPRESSION
CrustalThickening
CrustalFaulting
Denser Crust to Mantle.
Crustal Convergenceand Compression.
HeatHeat and
Pressure
CRUSTAL ROCKS
Block 1 Block 2
Two Origins of Crustal Rocks:1) Continental Crust – Lower density as “floated” to outside of Earth.2) Oceanic Crust – Higher density as origin deeper in the mantle.
ContinentalCrust
ContinentalCrust
Oceanic Crust
CONVERGENT BOUNDARIESTwo types of crustal rocks, thus three possibletypes of convergence:
1. Oceanic vs. Continental:
e.g. Western South America
CONVERGENT BOUNDARIESTwo types of crustal rocks, thus three possibletypes of convergence:
1. Oceanic vs. Continental:
e.g. Western South America
2. Oceanic vs. Oceanic:
e.g. Japanese Islands
CONVERGENT BOUNDARIESTwo types of crustal rocks, thus three possibletypes of convergence:
1. Oceanic vs. Continental:
e.g. Western South America
2. Oceanic vs. Oceanic:
e.g. Japanese Islands
3. Continental vs. Continental:
e.g. Himalayas
1. GENERAL SETTING
WESTERN SOUTH AMERICAPacific Ocean Atlantic OceanSouth America
WESTERN SOUTH AMERICAPacific Ocean Atlantic OceanSouth America
Mid-Atlantic
Ridge
WESTERN SOUTH AMERICAPacific Ocean Atlantic OceanSouth America
Mid-Atlantic
Ridge
WESTERN SOUTH AMERICAPacific Ocean Atlantic OceanSouth America
South American Plate
African Plate
Mid-Atlantic
Ridge
WESTERN SOUTH AMERICAPacific Ocean Atlantic OceanSouth America
South American Plate
African Plate
Mid-Atlantic
Ridge
WESTERN SOUTH AMERICAPacific Ocean Atlantic OceanSouth America
South American Plate
Mid-Atlantic
Ridge
EastPacific
Rise
African Plate
WESTERN SOUTH AMERICAPacific Ocean Atlantic OceanSouth America
South American Plate
Mid-Atlantic
Ridge
EastPacific
Rise
Nazca Plate
Nazca Plate
Pacific Plate
African Plate
WESTERN SOUTH AMERICAPacific Ocean Atlantic OceanSouth America
South American Plate
Mid-Atlantic
Ridge
EastPacific
Rise
Nazca Plate
Nazca Plate
Pacific Plate
African Plate
WESTERN SOUTH AMERICAPacific Ocean Atlantic OceanSouth America
South American Plate
Mid-Atlantic
Ridge
EastPacific
Rise
Nazca Plate
Nazca Plate
Pacific Plate
African Plate
CONVERGENCE AND CRUSTAL COMPRESSION
WESTERN SOUTH AMERICAPacific Ocean Atlantic OceanSouth America
Nazca Plate
South American Plate
African Plate
Pacific Plate
EastPacific
Rise
Mid-Atlantic
Ridge
Crustal Thickening
WESTERN SOUTH AMERICAPacific Ocean Atlantic OceanSouth America
Nazca Plate
South American Plate
African Plate
Pacific Plate
EastPacific
Rise
Mid-Atlantic
Ridge
Mato GrossoBrazilian HighlandsGuiana Highlands
Compressional Faulting
WESTERN SOUTH AMERICAPacific Ocean Atlantic OceanSouth America
Nazca Plate
South American Plate
African Plate
Pacific Plate
EastPacific
Rise
Mid-Atlantic
Ridge
Mato GrossoBrazilian HighlandsGuiana Highlands
More dense oceanic crustSub-ducted beneath South America
WESTERN SOUTH AMERICAPacific Ocean Atlantic OceanSouth America
Nazca Plate
South American Plate
African Plate
Pacific Plate
EastPacific
Rise
Mid-Atlantic
Ridge
Mato GrossoBrazilian HighlandsGuiana Highlands
Deep oceantrench
WESTERN SOUTH AMERICAPacific Ocean Atlantic OceanSouth America
Nazca Plate
South American Plate
African Plate
Pacific Plate
EastPacific
Rise
Mid-Atlantic
Ridge
Mato GrossoBrazilian HighlandsGuiana Highlands
ShallowEarthquakes
DeepEarthquakes
Heat and pressurecause melting
WESTERN SOUTH AMERICAPacific Ocean Atlantic OceanSouth America
Nazca Plate
South American Plate
African Plate
Pacific Plate
EastPacific
Rise
Mid-Atlantic
Ridge
Mato GrossoBrazilian HighlandsGuiana Highlands
Heat and pressurecause melting
Ocean sediments
Andes
WESTERN SOUTH AMERICAPacific Ocean Atlantic OceanSouth America
Nazca Plate
South American Plate
African Plate
Pacific Plate
EastPacific
Rise
Mid-Atlantic
Ridge
Mato GrossoBrazilian HighlandsGuiana Highlands
Heat and pressurecause melting
AndesActive Volcanoes
03.05.b1
03.09.a1
2. JAPANESE ISLANDS GENERAL SETTING
Pacific OceanAsia Sea ofJapan
JAPANESE ISLANDS
EastPacific
Rise
Pacific OceanAsia Sea ofJapan
JAPANESE ISLANDS
EastPacific
Rise
Nazca Plate
Pacific Plate
Pacific OceanAsia Sea ofJapan
JAPANESE ISLANDS
EastPacific
Rise
Nazca Plate
Pacific Plate
Pacific OceanAsia Sea ofJapan
JAPANESE ISLANDS
EastPacific
Rise
Nazca Plate
Pacific Plate
Eurasian Plate
Pacific OceanAsia Sea ofJapan
JAPANESE ISLANDS
EastPacific
Rise
Nazca Plate
Pacific Plate
Eurasian Plate
Pacific OceanAsia Sea ofJapan
JAPANESE ISLANDS
Eurasia Moved from North Atlantic Mid-ocean Ridge
EastPacific
Rise
Nazca Plate
Pacific Plate
Eurasian Plate
Pacific OceanAsia Sea ofJapan
JAPANESE ISLANDS
CONVERGENCE AND CRUSTAL COMPRESSION
EastPacific
Rise
Nazca Plate
Pacific Plate
Eurasian Plate
Pacific OceanAsia Sea ofJapan The Pacific Plate composed
entirely of denser oceanic crust, is subducted beneath the oceanic fringe of the dominantly continental Eurasian Plate.
JAPANESE ISLANDS
EastPacific
Rise
Nazca Plate
Pacific Plate
Eurasian Plate
Pacific OceanAsia Sea ofJapan
Ocean trench
JAPANESE ISLANDS
EastPacific
Rise
Nazca Plate
Pacific Plate
Eurasian Plate
Pacific OceanAsia Sea ofJapan
Heat andPressure cause melting
JAPANESE ISLANDS
EastPacific
Rise
Nazca Plate
Pacific Plate
Eurasian Plate
Pacific OceanAsia Sea ofJapan
Heat andPressure cause melting
Shallow and deep earthquakes
JAPANESE ISLANDS
EastPacific
Rise
Nazca Plate
Pacific Plate
Eurasian Plate
Pacific OceanAsia Sea ofJapan Mountain building breaking
ocean surface as a series of islands or “island arcs”.
JAPANESE ISLANDS
EastPacific
Rise
Nazca Plate
Pacific Plate
Eurasian Plate
Pacific OceanAsia Sea ofJapan
Compressional faulting permits “recycled” oceanic crust to rise to the surface, producing active volcanoes.
JAPANESE ISLANDS
Island Arcs
OceanTrenches
EastPacific
Rise
Nazca Plate
Pacific Plate
Eurasian Plate
Pacific OceanAsia Sea ofJapan As the Pacific plate is
subducted it tends to “roll-back” southeastwards, pulling the Japanese Islands further off of Asia.
“Push”
“Pull”
JAPANESE ISLANDS
EastPacific
Rise
Nazca Plate
Pacific Plate
Eurasian Plate
Pacific OceanAsia Sea ofJapan Motion of Japanese islands
away from Asia causes split of crust and “back arc spreading” beneath the sea of Japan .
JAPANESE ISLANDS
03.00.a1e
Source: R.A. Kerr., 2011 Science, 332, p.911
Displacement duringEarthquake March 2011.
Source: Simons et al., 2011 Science Express
CREDIT: ADAPTED FROM THE EARTHQUAKE RESEARCH COMMITTEE, NATIONAL SEISMIC HAZARD MAPS FOR JAPAN (2010), HEADQUARTERS FOR EARTHQUAKE RESEARCH PROMOTION
3. HIMALAYAGENERAL SETTING
250 million years ago
Eurasia
Indian sub-continent
EARLY DIVERGENCE ANDCRUSTAL EXTENSIONAfrica India
HIMALAYA MOUNTAINS250 million years ago
Africa and India part of the same continental mass, Gondwanaland, also comprised of present day, South Africa, Australia and Antarctica.
Africa India Eurasia
Eurasian Plate
African Plate
HIMALAYA MOUNTAINS250 million years ago
Eurasia (Europe and Asia), part of northern continental landmass including present day North America.
Africa India Eurasia
Eurasian Plate
African Plate
HIMALAYA MOUNTAINS250 million years ago
Sea of Tethys
Tethys Plate
Africa India Eurasia
Eurasian Plate
Tethys Plate
African Plate
HIMALAYA MOUNTAINS250 million years ago CONVERGENCE (Ocean
vs Continent) AND CRUSTAL COMPRESSION
Africa India Eurasia
Eurasian Plate
Tethys Plate
African Plate
HIMALAYA MOUNTAINS250 million years ago
Tethys Ocean crustsubducted beneath Eurasian continent
Africa India Eurasia
Eurasian Plate
Tethys Plate
African Plate
HIMALAYA MOUNTAINS250 million years ago
Ocean trench
Africa India Eurasia
Eurasian Plate
Tethys Plate
African Plate
HIMALAYA MOUNTAINS250 million years ago
Melting underHeat and pressure
Africa India Eurasia
Eurasian Plate
Tethys Plate
African Plate
HIMALAYA MOUNTAINS250 million years ago
Earthquakes
Africa India Eurasia
Eurasian Plate
Tethys Plate
African Plate
HIMALAYA MOUNTAINS250 million years ago
Mountainbuilding
Africa India Eurasia
Eurasian Plate
Tethys Plate
African Plate
HIMALAYA MOUNTAINS250 million years ago
Volcanoes
Africa India EurasiaSea ofTethys
Eurasian Plate
Tethys Plate
African Plate
IndianOcean
Indo-Australian Plate
HIMALAYA MOUNTAINS150 million years ago
Africa India EurasiaSea ofTethys
Eurasian Plate
Tethys Plate
African Plate
IndianOcean
Indo-Australian Plate
HIMALAYA MOUNTAINS75 million years ago
Africa India Eurasia
Eurasian Plate
Tethys Plate
African Plate
IndianOcean
Indo-Australian Plate
HimalayaMountains
HIMALAYA MOUNTAINSPresent
Wilhan and Gaur, 2013. Buildings as weapons of mass destruction.www.sciencemag.org SCIENCE VOL 341 9, p618-619
03.00.a1d
INDUS GANGES
INDIA
PAKISTAN
CHINA
BANGLADESH
HIMALAYATIBET
PLATEAU
SICHUAN EARTHQUAKECHINA, 2008.
0 20 40 60 80 1006.0
6.5
7.0
7.5
8.0
8.5
9.0
WORLD’S 100 HIGHEST MOUNTAINS
RANK
ELEV
ATIO
N (m
)
Himalaya and Associated Ranges
Andes
03.02.b1
VOLCANOES
WHY NO VOLCANOES?
India Eurasia
Eurasian Plate
Tethys Plate
IndianOcean
Indo-Australian Plate
HimalayaMountains
WHAT’S HAPPENING NOW?Present
Tibetan Plateau
India Eurasia
Eurasian Plate
Tethys Plate
IndianOcean
Indo-Australian Plate
HimalayaMountains
WHAT’S HAPPENING NOW?Present
Tibetan Plateau
?
GLOBAL DISTRIBUTION OF EARTHQUAKES
GLOBAL DISTRIBUTION OF EARTHQUAKES
1. Western South America
GLOBAL DISTRIBUTION OF EARTHQUAKES
2. Japanese Islands
GLOBAL DISTRIBUTION OF EARTHQUAKES
3. Himalaya
GLOBAL DISTRIBUTION OF VOLCANOES
GLOBAL DISTRIBUTION OF VOLCANOES1. Western South America
GLOBAL DISTRIBUTION OF VOLCANOES2. Japanese Islands
GLOBAL DISTRIBUTION OF VOLCANOES3. Himalaya