Taconian orogeny in the New England Applachians: collision between Laurentia and the Shelburn Falls arc: comment and reply

Article Abstract:

Paul Karabinos and associates conducted an experiment on Taconian orogeny in the New England Appalachians. They came to the conclusion that the igneous activity in the Bronson Hill in Massachusetts is too young to be contemporaneous with Taconian dynamothermal metamorphism. They also provided geochronologic and geochemical proof for 485 to 447 Ma arc-related volcanic and intrusive activity within the Rowe-Hawley zone of western Massachusetts and southern Vermont. However, the study is misleading due to its reliance on an apparent conflict between Taconian ages of metamorphism and volcanism.

Appalachian region, Laurasia (Geology), Laurasia, Shelburne Falls, Massachusetts, Karabinos, Paul

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Did the Indo-Asian collision alone create the Tibetan plateau?: comment

Article Abstract:

Murply et al erroneously concluded that the southern plateau in Tibet had risen by 3-4 km since 99 Ma. as a result of the collision between the Lasha and Qiangtang blocks at the time of the Early Cretaceous age. This error has been found because sediments in the area have been analyzed to contain reef limestone and radiolarian chert instead of being mainly continental as would be the case had the alleged elevation of the topography happened.

Analysis, Tibet, Sediments (Geology), Plateaus

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Magmas in collision: rethinking chemical zonation in silicic magmas

Article Abstract:

Zoned andesite-rhyolite eruptions are responses to mafic recharge, especially where the resident magma is andesitic but the intruding magma is silicic. Examples of such hybrid eruptions have happened at the Soufriere Hills volcano in Montserrat and the Unzen volcano in Japan.

Alaska, Magma, Calderas

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