Synthesis of the geology of the northeastern Appalachians, U.S.A.

Certified reference materials (GBW09170 and 09171) of creatinine in human serum

“…Routine clinical measurement of creatinine is based on the Jaffe method [4,5], a colorimetric determination of the picrate derivative, or several enzymatic assays [6][7][8]. However, these routine clinical tests suffer the disadvantage of low specificity.…”

Zircon isotopic age from the Union ultramafic complex, Maine

“…Regional geologic interpretations of Acadian tectonics (i.e., Osberg 1978) have generally located the Acadian suture zone between the North American continental mass and Avalonia as close to the area of the Union ultrarnafic complex in coastal central Maine. Osberg (1978) in his mode1 of New England platetectonic evolution has shown this Acadian suture as developing between the volcanics and volcanic arc of basement "C" (Memmack Trough) and the continental crust of Basement "D" (Avalonia) and lacking the characteristic ocean-cmst signature of other sutures in the northem Appalachians. However, the Union complex is interpreted here as remnants of oceanic material caught up in the Acadian suture during closure of Iapetus and the collision of the Avalonian microcontinent.…”

“…The location of the Union ultramafic complex adjacent to the southerly projection of this high-angle fault (Osberg et al 1974) is of paramount importance since Bickel (1976) has suggested that the St. George fault zone may constitute an Acadian geosuture in the Belfast area. Osberg (1978) has proposed a mode1 for the tectonic evolution of the New England Appalachians in which a converging plate margin existed at the western edge of Avalonian microcontinent with an eastward-dipping subduction zone. He suggested that operation on this subduction zone closed a narrow ocean between North American and Avalonian basement with collision of the Avalonian basement with the accreted North American basement regimes, producing the Acadian orogeny.…”

The Main Basement Features Recognized in the Northern Part of the North Atlantic Area

“…This body is called the Bay of Maine igneous complex (Chapman, 1962); it is composed of volcanics (old andesites and rhyolites) of early Silurian to early Devonian origin and Devonian gabbroic rocks (Gates, 1969). The Bay of Maine mafic complex is probably adjacent to a suture (Osberg, 1978): the geochemical relationships of some associated ultramafic-mafic rocks strongly suggest an ocean-crustal affinity and origin (Gaudette, 1980). Thus, the same geophysical markers may be followed from south of Brittany to south of Iberia and south of the Maritimes.…”