Predominance of Grenvillian Magmatism Recorded in Detrital Zircons from Modern Appalachian Rivers
Detrital zircons from six modern rivers draining the Appalachian Mountains were dated using U-Pb isotopes measured by excimer laser ablation induction coupled plasma-mass spectrometry (ELA-ICP-MS). Of the 905 grains analyzed, 736 were acceptable for age determination and 524 (71%) of these yielded ages between 950 and 1250 Ma, defining a continuous Grenvillian tectonomagmatic event that peaked around 1020-1050 Ma. Of the remaining zircons, 20% (n = 149) have Paleozoic ages corresponding mainly...[Show more]
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|Source:||Journal of Geology|
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