Showing papers by "University of North Carolina at Wilmington published in 1972"

Petrology and Diagenesis of Tertiary Aquifer Carbonates, North Carolina: ABSTRACT

Abstract: Superior stone quarry near New Bern, North Carolina, exposes 9.2 m of Eocene Castle Hayne Limestone that is disconformably overlain by 2 m of an unnamed Oligocene carbonate unit. Both form part of the most important aquifer system in eastern North Carolina. The Eocene Castle Hayne strata are divisible into 2 massively bedded facies: (A) a sandy, pelecypod-mold biomicrudite with microspar and pseudospar matrix, and (B) a sandy, pelecypod-mold biosparite and biosparrudite, which grades westward into calcareous quartz sand. Facies A consists of unabraded pelecypod valves (dominantly molds of aragonite Macrocallista shells) and 20% by volume of moderately well-sorted, fine quartz sand that are set in microspar and pseudospar. Facies B consists of pelecypod valves (chiefly molds of worn, fragmented, and unabraded Macrocallista) and 27% of well-sorted, fine quartz sand. Sparry calcite cement forms 41% of this facies. Subordinate allochems in both are gastropods, foraminifers, bryozoans, echinoderms, ostracods, intraclasts, peloids, glauconite, and bone. Facies A is a low-energy, shallow-marine bank that accumulated seaward of Facies B, which was deposited in a higher energy nearshore environment. The Oligocene stratum is a sandy, molluscan-mold biomicrudite consisting of pelecypods, turritellid and naticid gastropods, and scaphopods (all as molds of unabraded aragonite shells) that are set in micrite. Fine, moderately well-sorted quartz sand forms 3% of the unit. Other allochems are echinoderms, foraminifers, peloids, ostracods, and bone. This is an inner or middle-shelf deposit that accumulated below wave base. Upon subaerial exposure, the following diagenetic changes occurred: (1) high-Mg calcite skeletons, mainly echinoderms, recrystallized to low-Mg calcite, (2) most aragonite skeletons dissolved to form molds, and the carbonate either precipitated nearby as low-Mg calcite cement, or neomorphed to spar, (3) molds were reduced or filled with low-Mg spar, and (4) micrite and pelmicrite aggraded to microspar and pseudospar. End_of_Article - Last_Page 1903------------

Preparation, IR, UV, NMR, and Mass Spectral Fragmentations of New Substituted Phenoxaphosphinic Acids

Abstract: The synthesis and IR, UV, NMR; and mass spectral fragmentations of substituted phenoxaphosphinic acids I – XIV are reported. A diazo method gave I, and the Friedel-Crafts method II – XIV. Infrared assignments: POH, broad bands, 2600, 2250, and 1650; C-P, 1490 - 1440; C-O, 1280 - 1260; P=0, 1190 - 1140; and P-O, 978 - 974 cm−1. Characteristic bands also occur at 1330 - 1320 and 1230 - 1210 cm−1. The UV spectra possess maxima at 210 - 220 mμ (log ∈ 4.50 - 4.60), 240 - 250 (4.20 - 4.30), and 298 – 304 (3.65 – 3.75). The NMR spectra give τ 7.56 ppm for a 2-methyl substituent, 7.48 for a 4-methyl and a quartet at 7.26 and a triplet at 8.71 (J = 7.7 Hz) for a 2-ethyl. The chemical shifts were virtually unaffected by alkyl or halogen substituents on the other aromatic ring but were shifted upfield by ortho or meta methyl substituents on the same ring. Singlets at τ 7.44 and 7.60 ppm in the spectrum of VIII gave calculated base values of about 7.28 and 7.44 for a 1-methyl and 3-methyl, respectively. The mass spectra are greatly influenced by the substituents. All showed loss of PO2H from the molecular ion or in the case of ethyl compounds after CH3· expulsion. CHO or CCIO was then eliminated. The molecular ions of methyl compounds eliminated H2O.