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Title: The anatomy of a hydrothermal (explosion ) breccia, Abbot Village, central Maine

Abstract

An apparently intrusive hydrothermal breccia is exposed in a large outcrop along Kingsbury Stream downstream from the Route 6 bridge in Abbot Village. The breccia intrudes the Siluro-Devonian Madrid Formation which is comprised of thick-bedded metasandstone interbedded with less fine-grained schist and phyllite at regional biotite grade. In the vicinity of the breccia, the bedding attitude in the Madrid is N60E 70SE and the section faces SE. The breccia is a concordant body with respect to bedding and the exposure shows what appears to the SW terminus of the intrusion which extends an unknown distance NE. The main phase of the breccia consists of randomly oriented and angular clasts'' of Madrid metasandstone and schist that are cemented by a quartz-dominated matrix. The random orientation of the clasts is present this phase were it is in contact with the country rock. The matrix comprises about 15% of the volume of the breccia and, in addition to quartz, contains biotite, galena, chalcopyrite ( ), pyrite, and an iron-carbonate. In some interstitial matrix, apparently late iron-carbonate fills post-quartz vugs that contain quartz-crystal terminations. The wall phase contains a higher proportion of biotite schist clasts that in places are bent around each other andmore » metasandstone clasts. Quartz veins extending into the country rock near the breccia follow prominent regional joint directions and suggest hydrofracturing of the Madrid was the principal mechanism for breccia formation. The breccia is interpreted to be of explosive origin with the main phase of the body representing clasts that fell down within the vent'' following upward transport. The wall phase is taken to have formed due to adhesion to the wall of breccia clasts during the eruptive stage.« less

Authors:
 [1]
  1. (Boston Coll., Chestnut Hill, MA (United States). Dept. of Geology and Geophysics)
Publication Date:
OSTI Identifier:
5805840
Alternate Identifier(s):
OSTI ID: 5805840
Report Number(s):
CONF-9303211--
Journal ID: ISSN 0016-7592; CODEN: GAAPBC
Resource Type:
Conference
Resource Relation:
Journal Name: Geological Society of America, Abstracts with Programs; (United States); Journal Volume: 25:2; Conference: 28. annual Geological Society of America (GSA) Northeastern Section meeting, Burlington, VT (United States), 22-24 Mar 1993
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; GEOLOGIC DEPOSITS; ORIGIN; PETROLOGY; GEOLOGIC STRUCTURES; MAINE; ERUPTION; GEOLOGIC HISTORY; GEOLOGY; HYDROTHERMAL SYSTEMS; MINERALOGY; PETROGENESIS; SCHISTS; DEVELOPED COUNTRIES; ENERGY SYSTEMS; GEOTHERMAL SYSTEMS; METAMORPHIC ROCKS; NORTH AMERICA; ROCKS; USA 580000* -- Geosciences

Citation Formats

Roy, D.C.. The anatomy of a hydrothermal (explosion ) breccia, Abbot Village, central Maine. United States: N. p., 1993. Web.
Roy, D.C.. The anatomy of a hydrothermal (explosion ) breccia, Abbot Village, central Maine. United States.
Roy, D.C.. Mon . "The anatomy of a hydrothermal (explosion ) breccia, Abbot Village, central Maine". United States.
@article{osti_5805840,
title = {The anatomy of a hydrothermal (explosion ) breccia, Abbot Village, central Maine},
author = {Roy, D.C.},
abstractNote = {An apparently intrusive hydrothermal breccia is exposed in a large outcrop along Kingsbury Stream downstream from the Route 6 bridge in Abbot Village. The breccia intrudes the Siluro-Devonian Madrid Formation which is comprised of thick-bedded metasandstone interbedded with less fine-grained schist and phyllite at regional biotite grade. In the vicinity of the breccia, the bedding attitude in the Madrid is N60E 70SE and the section faces SE. The breccia is a concordant body with respect to bedding and the exposure shows what appears to the SW terminus of the intrusion which extends an unknown distance NE. The main phase of the breccia consists of randomly oriented and angular clasts'' of Madrid metasandstone and schist that are cemented by a quartz-dominated matrix. The random orientation of the clasts is present this phase were it is in contact with the country rock. The matrix comprises about 15% of the volume of the breccia and, in addition to quartz, contains biotite, galena, chalcopyrite ( ), pyrite, and an iron-carbonate. In some interstitial matrix, apparently late iron-carbonate fills post-quartz vugs that contain quartz-crystal terminations. The wall phase contains a higher proportion of biotite schist clasts that in places are bent around each other and metasandstone clasts. Quartz veins extending into the country rock near the breccia follow prominent regional joint directions and suggest hydrofracturing of the Madrid was the principal mechanism for breccia formation. The breccia is interpreted to be of explosive origin with the main phase of the body representing clasts that fell down within the vent'' following upward transport. The wall phase is taken to have formed due to adhesion to the wall of breccia clasts during the eruptive stage.},
doi = {},
journal = {Geological Society of America, Abstracts with Programs; (United States)},
number = ,
volume = 25:2,
place = {United States},
year = {Mon Mar 01 00:00:00 EST 1993},
month = {Mon Mar 01 00:00:00 EST 1993}
}

Conference:
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