phosphorite

Abstract Increasing interest in deep-seabed mining has raised many questions surrounding its potential environmental impacts and… Expand

Sulfur bacteria such as Beggiatoa or Thiomargarita have a particularly high capacity for storage because of their large size. In… Expand

Orthochemical sediments associated with Neoproterozoic glaciation have prominence beyond their volumetric proportions because of… Expand

In order to investigate the radiological hazard of naturally occurring radioactive material (NORM) in phosphorite deposits of… Expand

A record of sedimentary, authigenic, and biological processes are preserved within the Upper Cretaceous (Campanian) Alhisa… Expand

Phosphorus is a critical element in the biosphere, limiting biological productivity and thus modulating the global carbon cycle… Expand

................................................................................................................................................................ 5 l . I ntroduction .......................................................................................................................................................... 5 I. l The scope of the study ...................................................................................................... .............................. 5 1 .2 Previous work ............................................. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1 .3 The investigated localities .......... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1 .4 Sedimentological methods ..... .......................................................................................... .............................. 7 1 .5 Paleontological material and methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2. Regional stratigraphy of the conglomerate and adjacent strata . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2 . 1 General features of the Brentskardhaugen Bed ............................................................... . ............................. 8 2 .2 Description of the Marhøgda Bed .................. . . ................................................................ ............................. 9 2.3 Festningen area ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2 .4 Diabasodden area ......... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2 . 5 Brentskardet area ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2 .6 Agardhbukta area ........ ......................................................... .......................................................................... 1 4 3 . Fossil content and age ............................................................. ................................................ .............................. 1 5 3 . 1 Ammonites and Belemnites ........................................................................................................................... 1 5 3 .2 Bivalves ........................................................................................................................................................... 1 5 3 .3 Brachiopods ......................................................................................................................... .......................... 1 5 3.4 Dinoflagellates ................................................................................................................. .............................. 1 5 3 . 5 Faunal comparisons ....................................................................................................................................... 1 5 3 .6 Age of the Brentskardhaugen Bed and adjacent strata ..................................................... ............................. 1 7 4 . Pebble content and orig in . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 8 4 . 1 Phosphorite pebbles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 8 4.2 Chert pebbles .................................................................................................................................................. 24 4.3 Quartz pebbles ................................................................................................................................................ 25 5 . The matrix of the conglomerate ............................................................................................................................ 25 6. Origin of the Marhøgda Bed ................................................................................................... . ... .... ...................... 25 7 . Concluding remarks on depositional history ....................................................................................................... 25 7 . 1 Source of pebbles ........................................................................................................................................... 25 7 .2 The Ladinian Pliensbachian interval ........................................................................... ... ........................... 25 7.3 The Toarcian Bajocian interval ................................................................................................................. 26 7 .4 The Bathonian Cal lovian interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 8. Paleontological part ................................................................................................................ .... .......................... 28 8 . 1 I ntroductory notes ........................... .......................................................... ..................................................... 28 8.2 List of descriptions ............................................................................................................... .......................... 29 8.3 Brachiopoda ..................................................................................................................... .... .......................... 30 8.4 Bivalvia . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1 8 .5 Ammonoidea .................................................................................................................................................. 36 8.6 Decapoda . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1 Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 �� .......................................................................................................................................................................... � Authors' address: Sven A. Backstra m Statoil P. O. Box 300 N-400 1 Stavanger Norway Present: Saga Petroleum als P. O. Box 9 N1 322 Høvik Norway lena Nagy Institute of Geology University of Oslo P. O. Box 1 047, Blindern Osl03 Norway 

Many models of the origin of marine phosphorites require a sediment rich in organic matter, which by decomposition releases… Expand

Apatite contains only traces of uranium, yet as apatite is a minor constituent in most rocks and the major constituent of a few… Expand

From introduction: This report details the investigations of the physical stratigraphy of the Phosphoria Formation in… Expand