1958/08/01 by Alonzo W. Quinn, Herbert David Glass · 1 citation
Earth and Planetary Sciences · Engineering · Mathematics · #Archaeology #Coal #Coal Properties and Utilization #Coal and Its By-products #Coal basin #Coal mining #Geochemistry #Geography #Geology #Mathematics #Metamorphic rock #Paleontology #Rank (graph theory) #Structural basin
paper · doi:10.2113/gsecongeo.53.5.563
openalex publication_date 1958/08/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/11
The coal and the associated sedimentary rocks of the Narragansett basin are progressively metamorphosed from north to south and southwest. X-ray analysis seems to give more definite indication of rank of these high-ash high-rank coals than does chemical analysis.Both chemical analysis and X-ray analysis reveal a close correspondence between rank of coal and metamorphic grade of associated rocks. At Pawtucket, coal, judged on the basis of X-ray analysis to be anthracite, is associated with rocks of the muscovite-chlorite subfacies of the green-schist facies that contain muscovite, paragonite, and chlorite. At Ports-mouth, meta-anthracite is associated with rocks still in the muscovite-chlorite subfacies and containing muscovite, chlorite, and ilmenite. At the Cranston mine, higher-rank meta-anthracite is associated with rocks in the biotite-chlorite subfacies.