Publications
Listed below are publication products directly associated with the Geology, Energy & Minerals Science Center:
Filter Total Items: 1270
Aluminum in hornblende: an empirical igneous geobarometer. Aluminum in hornblende: an empirical igneous geobarometer.
Electron-microprobe analyses of hornblendes from five calc-alkaline plutonic complexes representing low- and high-pressure regimes define a tightly clustered linear trend in terms of total Al (AlT) and tetrahedral Al (Aliv) contents. Data collated from the literature on calcic amphiboles from other plutonic complexes and from phase equilibrium experiments using natural rocks or synthetic...
Authors
J. M. Hammarstrom, E. Zen
Some practical approaches to world petroleum resource assessment Some practical approaches to world petroleum resource assessment
No abstract available.
Authors
Emil D. Attanasi, D. H. Root, C.D. Masters
Petroleum industry drilling in industrialized and developing areas Petroleum industry drilling in industrialized and developing areas
International drilling statistics show significant differences in target depths as well as the mix between onshore and offshore wells. Unlike the USA, where most of the drilling has been concentrated in depths to 5000 f (shallow depths), the preponderance of wildcat wells drilled in South America and Africa reach much deeper horizons. Offshore wildcat drilling represents less than 4% of...
Authors
Emil D. Attanasi
Proceedings of the Second U.S. Geological Survey workshop on the early Mesozoic basins of the Eastern United States Proceedings of the Second U.S. Geological Survey workshop on the early Mesozoic basins of the Eastern United States
No abstract available.
Authors
Gilpin R. Robinson, Albert J. Froelich
Significance of tourmaline-rich rocks in the Grenville Complex of St. Lawrence County, New York Significance of tourmaline-rich rocks in the Grenville Complex of St. Lawrence County, New York
Feldspathic quartzite and metapelite of Middle Proterozic age north of Gouverneur, N.Y., contain abundant dravite-uvite (magnesian tourmaline). These rocks, more than 1,000 feet thick, are regionally metamorphosed to the upper amphibolite facies, are pyritic, and locally contain porphyroblastic scapolite. The rocks are underlain by talctremolite schist and a thick sequence of calcitic...
Authors
C. Ervin Brown, Robert A. Ayuso
Government investment in mineral resource information on leasable public lands: The case of strippable coal Government investment in mineral resource information on leasable public lands: The case of strippable coal
A scheme is presented to aid the government in estimating the net benefits, in terms of itsrecovery of expected rents, of performing various levels of exploration of mineral tracts prior to leasing and making such information available to potential bidders. Conditions are identified where the government will profit by investment in geologic data that are collected and provided to...
Authors
Emil D. Attanasi
A note on petroleum industry exploration efficiency A note on petroleum industry exploration efficiency
No abstract available.
Authors
Emil D. Attanasi
Offshore exploration and industry change: The case of the Gulf of Mexico Offshore exploration and industry change: The case of the Gulf of Mexico
This paper considers industry structure and the exploration performance (by size class of operator) of firms searching for oil and gas in the U.S. Gulf of Mexico. It also tracks the changes in industry structure that have occurred in response to a decline in the quality of remaining prospects in the area. Data presented indicate that because vertically integrated majors dominated in...
Authors
Emil D. Attanasi, L. J. Drew
Microprobe analyses of hornblendes from 5 calc-alkalic intrusive complexes, with data tables for other calcic amphiboles and BASIC computer programs for data manipulation Microprobe analyses of hornblendes from 5 calc-alkalic intrusive complexes, with data tables for other calcic amphiboles and BASIC computer programs for data manipulation
No abstract available.
Authors
Jane Hammarstrom
Chromite from the Blue Ridge province of North Carolina Chromite from the Blue Ridge province of North Carolina
Accessory chromite in dunite shows a variety of textures that indicate alteration. One group, type A, consists of four types of chromite: clean chromite; lattice chromite, in which the invading chlorite occurs along three directions in the (100) plane; optically zoned chromite; and poikiloblastic chromite. Most of type A chromites are surrounded by chromian clinochlore. The other group...
Authors
Bruce R. Lipin