Composition and development of the continental tectosphere

  title={Composition and development of the continental tectosphere},
  author={T. Jordan},
Beneath the old continental nuclei are thick root zones which translate coherently during plate motions. These zones are apparently stabilised against convective disruption by the depletion of the continental upper mantle in a basalt-like component. Construction of this delicately balanced tectosphere is accomplished by the dynamic and magmatic processes of the Wilson cycle. 

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Basalt magma sources during the opening of the North Atlantic
The mantle that supplied basalts to the North Atlantic Tertiary province at the time of continental breakup was isotopically similar to the present-day sub-oceanic mantle. There is no evidence forExpand
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The transition to low seismic velocities below Phanerozoic Europe coincides with the crustal boundary zone of the craton and exists to depths of at least 140 kilometers, which rules out any significant lateral transport of asthenospheric material across the suture zone. Expand
Seismic evidence for a fossil mantle plume beneath South America and implications for plate driving forces
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Section 6. Siderophile Elements in Subcontinental Lithospheric Mantle
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The tectosphere and postglacial rebound
Large lateral variations in the thickness of the lithosphere and viscosity of the mantle may be associated with continental roots. The effects of continental roots, or the tectosphere, on postglacialExpand
Geodynamic evidence for a chemically depleted continental tectosphere.
Inversions of a large set of geodynamic data related to mantle convection, using tomography-based mantle flow models, indicate that the tectosphere is chemically depleted and relatively cold to 250 kilometers depth below Earth's surface. Expand
Some Speculations on Continental Evolution
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Subduction zone backarcs, mobile belts, and orogenic heat
Two important problems of continental tectonics may be resolved by recognizing that most subduction zone backarcs have hot, thin, and weak lithospheres over considerable widths. These are (1) theExpand
Seismic Evidence for a Detached Indian Lithospheric Mantle Beneath Tibet.
P-to-S converted teleseismic waves recorded across Tibet show a north-dipping interface that begins 50 kilometers north of the Zangbo suture at the depth of the Moho and extends to a depth of 200 kilometers beneath the Bangong suture. Expand
Thermal aspects of komatiite generation and greenstone belt models
Thermal modelling suggests that the problems posed by the high liquid temperatures (∼1,650 °C) of peridotitic lavas in Archaean greenstone belts, and the implied high degree of mantle melting (∼70%),Expand


Plate Tectonics and Crustal Evolution
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Is there an Icelandic mantle plume?
SCHILLING1 has interpreted the chemistry of basalt lavas from the Reykjanes Ridge and Iceland, identifying two distinct upper mantle sources for these lavas, one of which rises in a primordial hotExpand
Lateral heterogeneity and mantle dynamics
Recent work on the nature of the Earth's lateral heterogeneities yields two conclusions with implications for mantle dynamics: seismic velocity differences between continents and oceans extend toExpand
A Model for Plate Tectonic Evolution of Mantle Layers
Calculations of mass transfer with time demonstrate that the entire mass of the present mesosphere could have been produced in geologically reasonable times (3 x 109 to 4.5 x 109 years). Expand
Tibetan, Variscan, and Precambrian Basement Reactivation: Products of Continental Collision
Extensive terranes of basement reactivation are interpreted as resulting from crustal thickening following continental collision. It is suggested that terranes, such as the Grenville Province andExpand
St. Peter and St. Paul Rocks: A High-Temperature, Mantle-Derived Intrusion
St. Paul's Rocks, often postulated to be an exposure of the suboceanic mantle, consists of a wider variety of rocks than previously recognized. These perhaps crystallized at different mantle levels,Expand
Thermal model of continental lithosphere
The predictions of a simple model based on the concept that the lithosphere is a thermal boundary layer, somewhat analogous to a layer of ice on a pond, are in agreement with the relevant data fromExpand
The Karroo Volcanic Cycle
  • K. G. Cox
  • Geology
  • Journal of the Geological Society
  • 1972
The petrogenesis of all the Mesozoic igneous rocks of south-eastern Africa is considered in relation to a single unifying thermotectonic event postulated as initiating the disruption of Gondwanaland.Expand
The continental tectosphere
Studies of free oscillations and body wave travel times have established that the one-way vertical S wave travel times through the upper mantle average about 5 s greater for oceans than for stableExpand
A Discussion on the evolution of the Precambrian crust - Crustal development in the Precambrian
  • B. Windley
  • Geology
  • Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences
  • 1973
The oldest Archaean rocks in most shield regions are largely granulites and gneisses, and in west Greenland there is evidence of 1000 Ma of crustal history before the final high-grade metamorphism.Expand