Abstract

In the present mantle, plates and plumes are the main active components. However, calculations of the thermal evolution of the mantle based on purely thermal convection with plates and plumes yield very smooth changes, which are difficult to reconcile with the apparently episodic accumulation of continental crust and with observed changes in tectonic style through Earth history. The effects of composition on the density of the lithosphere, both at the surface and after subduction, can change the dynamics of plates and mantle convection, resulting in a repertoire of mantle behaviour that may better explain the observed tectonic evolution. Thus major mantle overturns may have occurred during the Archaean and possibly the Proterozoic, with dramatic tectonic and magmatic effects, and plate tectonics may not have worked in its modern form when the mantle was hotter. Plumes are not an alternative to plates: they come from a different thermal boundary layer. Plumes have probably played a significant but usually secondary role throughout Earth history.
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Product Type/Sub Type

nonGeographicDataset

Constraints

Creative Commons Attribution 4.0 International Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

1997-01-01T00:00:00

Product Type

nonGeographicDataset

Topic Category

geoscientificInformation

GA Catalogue Number

81481 Product http://www.ga.gov.au/metadata-gateway/metadata/record/81481/

Keywords

GA Publication
Journal
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Digital Transfer Options

onLine

Distributor

Role
distributor
Organisation Name
Commonwealth of Australia (Geoscience Australia)
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address

Metadata File Identifier

fae9173a-71a6-71e4-e044-00144fdd4fa6

Metadata Standard Name

ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

Metadata Standard Version

1.1

METADATA SECURITY CLASSIFICATION

unclassified

Metadata Contact

Role
pointOfContact
Organisation Name
Commonwealth of Australia (Geoscience Australia)
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
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