2002/07/01 by J. Brendan Murphy · 48 citations
Earth and Planetary Sciences · #Basement #Geochemistry #Geochemistry and Elemental Analysis #Geological and Geochemical Analysis #Geology #Gondwana #Mafic #Magmatism #Paleontology #Paleontology and Stratigraphy of Fossils #Passive margin #Rift #Rodinia #Structural basin #Tectonics #Terrane
paper · doi:10.1086/340630
published in The Journal of Geology 110(4), 407-419 (University of Chicago Press)
openalex publication_date 2002/07/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/23
The Neoproterozoic Gamble Brook Formation in the Avalon Terrane of Nova Scotia consists of quartzitic, pelitic, and psammitic metasedimentary rocks. The formation is generally interpreted to have been deposited in an Atlantic‐type passive margin setting along the Amazonian margin of Rodinia before the main ca. 650–550‐Ma phase of Avalonian subduction‐related magmatism. The geochemical and Sm‐Nd isotopic signature of these metasedimentary rocks, however, shows that although the quartzites are predominantly derived from ancient cratonic basement, the pelites and psammites were derived from moderately fractionated mafic to intermediate proto‐Avalonian crust. The two contrasting sources for the Gamble Brook rocks are incompatible with a passive margin setting and are instead interpreted to reflect deposition along a basin margin within a rifted‐arc environment. Taken as a whole, the Amazonian margin of Gondwana preserves evidence of episodic subduction in a western Pacific‐like setting between 1000 and 650 Ma, followed by terrane accretion and Andean‐style magmatism between 640 and 550 Ma.