Now showing items 271-280 of 307
Evidence for syntectonic crystallization for the mudstone to slate transition at Lehigh gap, Pennsylvania, U.S.A.
(Elsevier, 1986)
Data primarily for phyllosilicates have been obtained for the continuous transitional sequence from mudstone to slate with well-developed slaty cleavage at Lehigh Gap, Pennsylvania, and for slates from quarries in the same ...
Late Proterozoic paleomagnetism and tectonic models: a critical appraisal
(Elsevier, 1991-10)
Interpretations of Proterozoic orogenic belts in terms of plate tectonic processes have been widely divergent. Published models range between the extremes of no relative motions between continental nuclei (implying ensialic ...
Early diagenesis in rapidly accumulating sediments on the Alboran slope, ODP site 976
(Springer-Verlag; Springer-Verlag Berlin Heidelberg, 1999-01)
The oxidation and reduction that occur during early diagenesis of sediments has been studied in the interstitial waters of a rapidly accumulating sedimentary sequence from the Mediterranean margin of Spain. A series of ...
Formation of corrensite, chlorite and chlorite-mica stacks by replacement of detrital biotite in low-grade pelitic rocks
(Blackwell Publishing Ltd, 1994-11)
Transmission and scanning electron microscopy were utilized to investigate the nature and mechanisms of alteration of abundant detrital biotite of volcanic origin and progressive modification of phyllosilicate aggregates ...
Diagenesis of vascular plant organic matter components during burial in lake sediments
(Kluwer Academic Publishers; Springer Science+Business Media, 1995-03)
Diagenetic changes are difficult to distinguish from variations in sources of organic matter to sediments. Organic geochemical comparisons of samples of wood, bark, and needles from a white spruce ( Picea glauca ) living ...
Stratigraphy of the mid-Holocene black bands in Lakes Michigan and Huron: Evidence for possible basin-wide anoxia
(Kluwer Academic Publishers; Springer Science+Business Media, 2003-02)
The post-glacial history of the Great Lakes has involved several changes in lake levels throughout the latest Pleistocene and Holocene, resulting from the changing position of the retreating Laurentide ice sheet, outlet ...
The europium anomaly of seawater: implications for fluvial versus hydrothermal REE inputs to the oceans
(Elsevier, 1991-10-25)
Seafloor hydrothermal vent fluids are characterized by rare earth element (REE) enrichments and large positive Eu anomalies; however, this input is not recorded by seawater. Hydrothermal sediments from the southeast Pacific ...
An organic carbon isotopic record of glacial-postglacial change in atmospheric pCO2 in the sediments of Lake Biwa, Japan
(Elsevier, 1993-11)
A 12 m piston core of sediment from Lake Biwa, Japan, provides a high-resolution record of sedimentary organic matter accumulation over the Pleistocene-Holocene transition. Organic carbon concentrations are generally 1-2% ...
The sedimentation history of Lake Huron and Georgian Bay: results from analysis of seismic reflection profiles
(Kluwer Academic Publishers; Springer Science+Business Media, 1995-05)
An extensive seismic reflection profile survey conducted concurrently with a sediment coring program in northern Lake Huron, Georgian Bay, and the North Channel revealed a detailed Holocene lake level history. Seven acoustic ...