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Cleaves Lincoln Rogers

Publications and source records attributed to Cleaves Lincoln Rogers.

9 recordsLinked to original sources
USGS1977

Potassium-argon geochronology of some metamorphic, igneous, and hydrothermal events in Puerto Rico and the Virgin Islands

Potassium-argon ages of hornblende, biotite, and whole rocks in Puerto Rico include the following: 126 m.y. for amphibolites in the southwest part of the island; 109 m.y. for the oldest known quartz diorite plutons; 88 to 65 m.y. for emplacement of various quartz diorite and granodiorite batholiths and stocks; 38 to 46 m.y. for intrusions of quartz diorite porphyry stocks and their hydrothermal alteration and mineralization. These intrusions are the youngest known igneous rocks in Puerto Rico. In addition, a 35-m.y. age was determined for hornblende and biotite from the Virgin Gorda batholith. Although widespread hydrothermal alteration as old as 75 m.y. is known in Puerto Rico, all important copper deposits are related to the 38- to 46-m.y. old intrusions.

Puerto Rico↗
USGS1962

Titanium in the United States, exclusive of Alaska and Hawaii

The accompanying map shows the location of the principal deposits of titanium minerals in the United States (excluding Alaska and Hawaii). Four broad geologic categories of deposits have been distinguished on the map by the shapes of the symbols, and relative importance is indicated by their size. The smaller deposits and the deposits for which adequate data are lacking can only be rated as "potential, unevaluated, or small". The deposits placed in the next category have been characterized by modest production or can be described as having "significant potential". The larger deposits, for which, more information is available, arc divided into two categories, based on estimated production plus reserves: those containing 1,000,000 to 10,000,000 tons of TiO2, and those having more than 10,000,000 tons of TiO2.

Mineral Investigations Resource Map↗
USGS1952

Phosphate deposits of the Concepcion del Oro district, Zacatecas, Mexico

The two small Mexican plants that are currently producing acid-phosphate fertilizer from phosphate rock have a productive capacity of about 45,000 metric tons annually. The larger plant processes pebble phosphate imported from Florida, while the other is utilizing material from the small, widely scattered phosphate deposits of Nuevo Leon. Large-scale expansion of this young superphosphate industry is dependent upon the discovery of new, larger domestic deposits in Mexico.

Zacatecas↗