Muscovite-garnet granites in the Mojave Desert: relation to crustal structure of the cretaceous arc: comment and reply

Article Abstract:

Miller, Glazner and Crowe (1996) examined similarities of the isotopic data on a diffuse belt of Late Cretaceous muscovite +/- granites in the western Mojave Desert with the metagraywacke schists of the Pelona-Orocopia-Rand schists. They proposed that the metagraywacke schists serve as the melt sources for the muscovite-garnet granites, thus suggesting that the emplacement of the Pelona-Orocopia-Rand schists would have to have taken place before Late Cretaceous magmatism and not in early Tertiary time. An alternative to this interpretation is presented and criticized by Miller et al.

Analysis, Cretaceous period, Granite, Muscovite, Garnet, Schists

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Late-stage sinking of plutons; comment and reply

Article Abstract:

Glazner and Miller (1997) presented a study suggesting that plutons may sink immediately after crystallization and drag down their host rock. Although there is a fair amount of evidence present for downward flow of host rock around plutons, no evidence may be seen for pluton sinking. However, it is suggested that the downward flow of host rock is a natural process during magma ascent and that it transfers host rock down toward the region of growing crustal roots beneath arcs.

Criticism and interpretation, Rock mechanics, Rocks, Igneous, Igneous rocks, Glazner, Allen F., Miller, David M.

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Comment and reply

Article Abstract:

An interpretation of the tectonic evolution of the Miocene extension in Southern California is criticized in terms of the extent and origin of the extension. However, it is explained that the negative reactions are a result of misinterpreting both the paper and existing data. In particular, misunderstanding lies in the influence of vertical axis rotations in the tectonic origin of the Miocene extension during the later part of the Cenezoic era.

Natural history, Miocene Epoch, Faults (Geology), Mendocino, California

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