Lithogeochemical character of the near-surface bedrock in the Connecticut, Housatonic, and Thames River Basins

Water-Resources Investigations Report 99-4000
By: , and 

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Abstract

This data layer shows the generalized lithologic and geochemical (lithogeochemical) character of near-surface bedrock in the Connecticut, Housatonic, and Thames River Basins and several other small basins that drain into Long Island Sound from Connecticut. The area includes most of Connecticut, western Massachusetts, eastern Vermont, western New Hampshire, and small parts of Rhode Island, New York, and Quebec, Canada.Bedrock geologic rock units are classified into 29 lithogeochemical rock units, on the basis of the relative reactivity of their constituent minerals to dissolution and other weathering reactions and the presence of carbonate or sulfide minerals. The 29 lithogeochemical units (28 of which can be found in the study area) can be grouped into 6 major categories: (1) carbonate-rich rocks, (2) carbonate-poor, clastic sedimentary rocks restricted to distinct depositional basins, (3) metamorphosed, clastic sedimentary rocks (primarily noncalcareous), (4) mafic igneous rocks and their metamorphic equivalents, (5) ultramafic rocks, and (6) felsic igneous and plutonic rocks and their metamorphic equivalents. The lithogeochemical rock units also are grouped into nine lithologic and physiographic provinces (lithophysiographic domains), which can be further grouped into three major regions: (1) western highlands and lowlands, (2) central lowlands, and (3) eastern highlands.

Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title Lithogeochemical character of the near-surface bedrock in the Connecticut, Housatonic, and Thames River Basins
Series title Water-Resources Investigations Report
Series number 99-4000
DOI 10.3133/wri994000
Edition -
Year Published 1999
Language ENGLISH
Publisher U.S. Geological Survey,
Contributing office(s) Eastern Mineral and Environmental Resources Science Center
Description 1 computer optical disc :col. maps ;4 3/4 in. +1 insert ([4] p. ; col. maps ; 13 x 13 cm.), in plastic box (12 x 15 x 1 cm.)