Geochemical investigations of some black shales and associated rocks

Abstract

Acknowledgments-______________________________________________ 4 Description of sample sets________________________________________ 5 Lower Paleozoic shales of Arkansas_____._____________________ 5 Black shale from the Tacket Formation of Jewett, Emery, and Hatcher (1965) of Kansas_____________________________ 6 Black shale from the Heath and Tyler Formations_______________ 6 Nonesuch Shale of Michigan and Wisconsin_____________________ 7 Oil shale from the Green River Formation of Colorado-____________ 8 Upper Cretaceous shales of Kansas____-_---_-_-_________________ 8 Upper Cretaceous shales of Texas_________________._____________ Upper Mississippian shales of western Wyoming_________________ Ashed shale from the Minnelusa Formation of South Dakota and Wyoming_________________________________ _____________ 10 Analytical methods.__________ _____________________________________ Statistical methods._______________________________________________ Distribution of elements in the sample sets___________________________ Lower Paleozoic shales of Arkansas___-_-_-_-____-__________.____ Black shale from the Tacket Formation of Jewett, Emery, and Hatcher (1965) of Kansas...___________________ Black shale from the Heath and Tyler Formations_______________ Nonesuch Shale of Michigan and Wisconsin _____ ___________ Oil shale from the Green River Formation of Colorado..___________ Upper Cretaceous shales of Kansas_________-______-_---____-____ Upper Cretaceous shales of Texas__________-_____-___-_-________ Upper Mississippian shales of Western Wyoming._________________ Ashed shale from the Minnelusa Formation of South Dakota and Wyoming______________________________________________ _ Summary______________ _____________________________________ _ 39 References cited____________________ ______________ ______ 42 m IV CONTENTS ILLUSTRATIONS Page FIGURE 1. Map of conterminous United States showing localities of black-shale sample sets 13-21______________________ A3 2. Explanatory vector diagrams________________________ 13 3-11. Rotated two-dimensional vector diagrams showing principal components of the correlation matrix: