Download or read book Cooccurrence of Fe Fe Ca and Ca phosphate Minerals in Concretions Within the Monterey Formation written by David Z. Piper and published by . This book was released on 1993 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phosphatic concretions occur within diatomite in the upper part of the Miocene Monterey Formation near Lompoc, Calif. Absence of disruption of fine laminar bedding in the associated sediment by the concretions shows that they formed after complete compaction of the enclosing sediment. The concretions exhibit a strongly concentric color, chemical, and mineralogic zonation. Many of them are composed of a nucleus in which vivianite is the dominant mineral. Amorphous ferric phosphate, mitridatite, and francolite are the dominant phosphatic phases in successive layers toward the surface of the concretions. Cd and As contents increase tenfold from the nucleus outward, reaching a maximum of 2,000 ppm, whereas Ni content, with a maximum of 720 ppm, and Co content show the opposite trend. This mineralogy and elemental composition favor accretion under conditions of continuously increasing Eh and pH, during uplift into the fresh-ground-water zone of the terrestrial environment. Shale-normalized rare-earth-element patterns, however, suggest a marine source for the elements biogenic debris consisting of opal-A, organic matter, and carbonates of the enclosing sediment.

Download or read book U S Geological Survey Bulletin written by and published by . This book was released on 1983 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book U S Geological Survey Bulletin written by Colin F. Williams and published by . This book was released on 1983 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phosphatic concretions occur within diatomite in the upper part of the Miocene Monterey Formation near Lompoc, Calif. Absence of disruption of fine laminar bedding in the associated sediment by the concretions shows that they formed after complete compaction of the enclosing sediment.The concretions exhibit a strongly concentric color, chemical, and mineralogic zonation. Many of them are composed of a nucleus in which vivianite is the dominant mineral. Amorphous ferric phosphate, mitridatite, and francolite are the dominant phosphatic phases in successive layers toward the surface of the concretions. Cd and As contents increase tenfold from the nucleus outward, reaching a maximum of 2,000 ppm, whereas Ni content, with a maximum of 720 ppm, and Co content show the opposite trend. This mineralogy and elemental composition favor accretion under conditions of continuously increasing Eh and pH, during uplift into the fresh-ground-water zone of the terrestrial environment. Shale-normalized rare-earth-element patterns, however, suggest a marine source for the elements biogenic debris consisting of opal-A, organic matter, and carbonates of the enclosing sediment.

Download or read book Monthly Catalogue United States Public Documents written by and published by . This book was released on 1993 with total page 1070 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Monthly Catalog of United States Government Publications written by United States. Superintendent of Documents and published by . This book was released on 1993 with total page 1068 pages. Available in PDF, EPUB and Kindle. Book excerpt: February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index

Download or read book Zentralblatt f r Mineralogie written by and published by . This book was released on 1992 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Phosphate Deposits Bibliography written by and published by . This book was released on 1999 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Guide to USGS Publications written by and published by . This book was released on 1998 with total page 1660 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bulletin of the Polish Academy of Sciences written by and published by . This book was released on 2001 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book New Publications of the U S Geological Survey written by and published by . This book was released on 1993 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book New Publications of the U S Geological Survey written by Geological Survey (U.S.) and published by . This book was released on 1993 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Publications of the Geological Survey written by Geological Survey (U.S.) and published by . This book was released on 1993 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Annual Index written by and published by . This book was released on 1994 with total page 1108 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1994-04 with total page 1200 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geology of the Southern Salinas Valley Area California written by David L. Durham and published by . This book was released on 1974 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Additional title page description: Stratigraphy, structure, and economic geology of parts of Monterey, San Luis Obispo, and San Benito Counties.

Download or read book The Monterey Formation written by Caroline M. Isaacs and published by Columbia University Press. This book was released on 2001 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides an extraordinary case study of a classic marine petroleum system in the prolific oil basins of California. Based on results from the Cooperative Monterey Organic Chemistry Study, the volume examines paleoenvironmental conditions, organic-matter deposition, source-rock characteristics, thermal maturation, and oil generation in the Monterey Formation.

Download or read book U S Geological Survey Bulletin written by and published by . This book was released on 1983 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: