Continents ring the changes

Article Abstract:

Commercially valuable metallic mineral deposits may result from the periodic formation and fragmentation of the continents, a process called the supercontinent cycle. This finding by M.E. Barley and D.I. Groves is important because it may enable economic geologists to predict the location of hitherto undiscovered mineral deposits. The supercontinent cycle is based on data indicating that the continents do not drift randomly but in 200 to 500 million year cycles. Barley and Groves show that the deposition of minerals has coincided with the supercontinent cycle throughout geological time.

Models, Geological research, Minerals, Minerals (Geology), Paleogeophysics

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Making composite continents

Article Abstract:

Eurasia's Altaid orogens indicate that the Eurasian continent was formed by the creation of new continental blocks as well as the rearrangement and merging of existing ones. The orogeny or mountain-building record from 600 million to 250 million years ago suggests that accretionary subduction complexes assembled progressively, and arc magmatism overlaid this structure. The Altaid period saw vast areas of new continental crust added to existing plates.

Eurasia, Morphotectonics, Continents

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Dating of the oldest continental sediments from the Himalayan foreland basin

Article Abstract:

Research is presented concerning the dating of continental sediments from the Balakot Formation foreland basin in Pakistan to 55-million-years of age. The implications for the timing of the India-Eurasia collision are discussed.

Pakistan, Letter to the Editor, Rocks, Sedimentary, Sedimentary rocks, Himalaya Mountains

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