Patterns of late Cenozoic volcanic and tectonic activity in the West Antarctic rift system revealed by aeromagnetic surveys

Article Abstract:

Magnetic anomalies over large ice- and sea-covered areas of the West Antarctic rift system are interpreted as proof of late Cenozoic volcanism. Aeromagnetic profiles and detailed surveys indicate that the late Cenozoic magmatic rock volume is much more than that of exposed volcanos. A theory suggests greater lower lithosphere stretching, resulting in enhanced decompression melting. However, the presence of spreading centers around the Atlantic Plate introduces a space problem in this theory.

Observations, Geology, Stratigraphic, Stratigraphy, Plate tectonics, Cenozoic Era, Volcanism, Geophysical research

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Thermal models of core-complex evolution in Arizona and New Guinea: implications for ancient cooling paths and present-day heat flow

Article Abstract:

Conductive finite-element models were used to study the specific thermal consequences implied in the geometry of detachment faulting for core complexes in Arizona and southern California. A simple model that combines conductive relaxation with advective heat transport via core-complex unroofing in a shallowly dipping rotating-hinge geometry was found to be consistent with various thermochronologic data such that the differences between data sets that appear contradictory are reconciled.

Models, Arizona, Natural history, Faults (Geology), Finite element method, Metamorphism (Geology), New Guinea

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