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| Guilford Quartz Monzonite ： ウィキペディア英語版 |
Guilford Quartz Monzonite
The Guilford Quartz Monzonite is a Silurian or Ordovician monzonite pluton in Howard County, Maryland. It is described as a biotite-muscovite-quartz monzonite which occurs as discontinuous lenticular bodies〔(USGS Mineral Resources On-Line Spatial Data )〕 which intrude mainly through the Wissahickon Formation (gneiss).
The extent of this intrusion was originally mapped in 1940〔Cloos, Ernst, and Broedel, C.H., 1940, Geologic map of Howard County and adjacent parts of Montgomery and Baltimore Counties (Maryland): Maryland Geological Survey County Geologic Map, 1 sheet, scale 1:62,500〕 as the "Guilford granite". It was given its current name in 1964 by C. A. Hopson.〔Hopson, C. A., 1964, The crystalline rocks of Howard and Montgomery Counties: Maryland Geological Survey County Report, 337 p., (Reprinted from Cloos, Ernst, and others, "Geology of Howard and Montgomery Counties," p. 27-215)〕 Hopson grouped the Guilford Quartz Monzonite with the Ellicott City Granodiorite and the Woodstock Quartz Monzonite as "Late-kinematic intrusive masses."
==Description==
The Guilford Quartz Monzonite was described in 1898 as "perhaps the most attractive stone in the state" by Edward B. Mathews of the Maryland Geological Survey.〔(Maryland Geological Survey Volume 2 ), 1898, The Johns Hopkins Press, Baltimore.〕 He provides this detailed description of the granite:
Hopson〔 reported the chemical composition (by %) of the Guilford Quartz Diorite from 1.5 miles west-southwest of Guilford along the Middle Patuxent River, as follows:
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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