South of Little Raft Lake in the Chief Lake granitic complex, south of Sudbury, Canada, Na-rich, felsic magma locally commingled with a Na-rich mafic magma. In addition, subhedral quartz and large sodic plagioclase phenocrysts floated-off from the fel . . .

Most geologists believe that plutonic bodies, including granites, have been emplaced as magma, even though the majority of granites contain mineral assemblages that are stable in the temperature range of 400-600º C − well below melting conditions for . . .

Examples of how silicate minerals in plutonic igneous rocks are modified by mobilized K and Si in the temperature range of about 350-550ºC have not been described elsewhere, whereas modifications above and below this range have been thoroughly documen . . .

There is no doubt that the Donegal intrusions (Fig. 1) were originally magmatic in origin. The magmatic style, petrologic history, age, and structure of the Donegal granites have been thoroughly studied (e.g., Pitcher and Berger, 1972; Holder, 1979; B . . .

In this presentation questions are raised about a melt-restite unmixing model proposed by Barton and Sidle (1994) for the myrmekite-bearing Waldoboro granite complex along the southeastern coast of Maine (USA). This complex consists mostly of granite/ . . .

The AOC Granite 7-32-89-10 hole, drilled to search for oil in the Precambrian basement below the Alberta bituminous (tar) sands near Fort McMurray, Canada, penetrates layered biotite-hypersthene quartz diorite-gabbro sills that occur between 543 and 2 . . .

Experimental work of Tuttle and Bowen (1958 has been the foundation for most modern studies on the origin of granite. Their experiments convinced most petrologists that granite cannot form by granitization (elemental replacements involving solid-state . . .

The granitic crust began to form about 2.5 billion years ago when potassium (K) was abundantly released from the mantle and rose toward the Earth's surface. Today, the mantle still contains about 0.79% K2O below 120 km depth, but between depths of 40 . . .

A megacrystal granodiorite, occurring in a pluton in the Monterey peninsula of California, is gradational south to quartz monzonite and then to tonalite and trondhjemite and southeast to granodiorite and then to tonalite. A primary magmatic origin for . . .

It is well known that in shear zones, which cut through granitoid rocks or granitic gneisses, introduced fluids bring in additional water, K, and Na as Fe, Ca, and Mg are subtracted (Beach, 1976; Dipple and Ferry, 1992). Such hydrothermal fluids commo . . .