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New Senator Caldera
The New Senator Caldera is a large striking Archean caldera complex within the heart of the Blake River Megacaldera Complex, Quebec, Canada. It has a diameter of 15-30 kilometers and is made of thick massive mafic sequences. The caldera complex has inferred to be a subaqueous lava lake during the early stages of the caldera's development.〔(ASH FALL: Newsletter of the Volcanology and Igneous Petrology Division Geological Association of Canada ) Retrieved on 2007-09-21〕 Gabbro sills represent lava lakes, which are common in mafic summit calderas. These subaqueous lava lakes are large units with a change in grain size from coarse to fine grained and a hyaloclastite top. The Kiwanis (Norands) intrusion, a high-level synvolcanic magma chamber, intrudes felsic rocks, and is in turn cross-cut by basaltic dikes and sills.
The Glenwood fault forms the eastern margin of the New Senator Caldera.
==See also==
*Noranda Caldera
*Misema Caldera
*Volcanism of Canada
*Volcanism of Eastern Canada
*List of volcanoes in Canada
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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