Examples of rifting

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Considering the age of the beginning of the rifting stage, the age of the calc-silicate series should be re-examined.
Stretching factors for each of three rifting periods are given.
Peaks in strain rate indicate periods of rifting and the values of were calculated directly from the strain rate distribution.
This lends support to a controlling influence for lithospheric rifting zones on continental flood basalt generation and emplacement.
The evidence, including that of xenoliths carried in the magmas, supports the idea of melting of old metasomatized lithospheric mantle, usually associated with rifting tectonics.
These characteristics suggest that the initiation of sinistral strike-slip movement behind the trench caused the basaltic volcanism subsequent to rifting.
Selecting 100 km gives a conservative estimate as this area has the thinnest lithosphere and will produce the least lamprophyre on rifting.
The heavy line indicates the line of initial rifting.
Possibilities include there being laterally equivalent parts of a continuous passive margin, or conjugate passive margins following an earlier episode of rifting.
In general, there is evidence for three rifting periods although individual sections sometimes have more complex histories.
This method requires no a priori information about either the duration of rifting or the total strain.
Therefore, the antecedent structures in most cases were not suitably oriented with respect to the external kinematic framework during initial rifting.
This thinning may be attributed to orogenic collapse or later rifting.
Remnant subsidence modelling usually provides lower-bound estimates due to uncertainties in rifting histories and in compaction.
The association of these two magma types is an example of bimodal mafic-ultramafic magmatism in a rifting environment.
Several pelitic and semipelitic intervals are present, perhaps indicative of thermal recovery during pauses in extensional rifting.
In this case the method will slightly overestimate as some thermal subsidence might be included, but it will underestimate the duration of rifting.
Furthermore, the high temperature of the granitic magmas and their intrusion at deep-crustal levels is consistent with magmatism generated by a rising mantle plume in an area of localized rifting.

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