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Lead-isotopic evidence for distinct source of granite and for distinct basement in the northern Appalachians, Maine.

Geology

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Abstract

Lead-isotopic compositions of feldspars in high-level Devonian granitic plutons across the northern Appalachians were measured. The presence of three fundamentally different sources of granites was indicated by three distinct lead-isotope groups. Plutons in the coastal lithotectonic block are the most radiogenic (206Pb/204Pb) 18.25-19.25; 207Pb/204Pb 15.59-15.67; 208Pb/204Pb 38.00-38.60); plutons in northern Maine are the least radiogenic (206Pb/204Pb 18.00-18.50; 207Pb/204Pb 15.51-15.55; 208Pb/204Pb 37.80-38.38). Intermediate lead-isotope values characterize the plutons in central Maine. All plutons show relatively radiogenic lead values for their ages and suggest the imprint of continental crustal sources, particularly in the coastal block. These plutons were formed in different crustal fragments in a continental environment, that were juxtaposed after emplacement of the granites.-L.C.H.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Lead-isotopic evidence for distinct source of granite and for distinct basement in the northern Appalachians, Maine.
Series title:
Geology
Volume
14
Issue:
4
Year Published:
1986
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geology
First page:
322
Last page:
325
Number of Pages:
4