The Mattapan Volcanic Complex is a suite of Proterozoicfelsic volcanic rocks in the U.S. state of Massachusetts. It is situated at the edge of the Boston Basin into the Blue Hills and lying unconformably atop the Dedham Granite. The complex is overlain by the Roxbury Conglomerate. In terms of its petrology, the rock types and compositions in the Mattapan Volcanic Complex are very similar to the Lynn Volcanic Complex and include ancient rhyolite and rhyodacite flows, some of which have porphyry characteristics, welded ash flows, tuff, breccia, extrusion domes and breccia pipes.
The Mattapan Volcanic Complex rhyolites are thinner and have less varied composition and texture than the Lynn complex. The complex also includes laminated argillite and volcanic conglomerate, which is easily confused with the Roxbury Conglomerate.
The complex is up to a kilometer thick in central areas of Boston, 600 meters thick in Hyde Park, close to Milton and fades out entirely eastward toward Hingham and Nantasket. [1]
Referencesedit
^Goldsmith, Richard (1991). Stratigraphy of the Milford-Dedham Zone, Eastern Massachusetts: An Avalonian Terrane. USGS. p. E24-E25.
This Massachusetts state location article is a stub. You can help Wikipedia by expanding it.
mattapan, volcanic, complex, suite, proterozoic, felsic, volcanic, rocks, state, massachusetts, situated, edge, boston, basin, into, blue, hills, lying, unconformably, atop, dedham, granite, complex, overlain, roxbury, conglomerate, terms, petrology, rock, typ. The Mattapan Volcanic Complex is a suite of Proterozoic felsic volcanic rocks in the U S state of Massachusetts It is situated at the edge of the Boston Basin into the Blue Hills and lying unconformably atop the Dedham Granite The complex is overlain by the Roxbury Conglomerate In terms of its petrology the rock types and compositions in the Mattapan Volcanic Complex are very similar to the Lynn Volcanic Complex and include ancient rhyolite and rhyodacite flows some of which have porphyry characteristics welded ash flows tuff breccia extrusion domes and breccia pipes The Mattapan Volcanic Complex rhyolites are thinner and have less varied composition and texture than the Lynn complex The complex also includes laminated argillite and volcanic conglomerate which is easily confused with the Roxbury Conglomerate The complex is up to a kilometer thick in central areas of Boston 600 meters thick in Hyde Park close to Milton and fades out entirely eastward toward Hingham and Nantasket 1 References edit Goldsmith Richard 1991 Stratigraphy of the Milford Dedham Zone Eastern Massachusetts An Avalonian Terrane USGS p E24 E25 nbsp This Massachusetts state location article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Mattapan Volcanic Complex amp oldid 1090377701, wikipedia, wiki, book, books, library,
