نتایج جستجو برای: sedimentary geochemistry

تعداد نتایج: 16788  

2003
GRZEGORZ RACKI

The world-wide and multidisciplinary Science Citation Index (SCI), available presently online as SCI Expanded via Web of Science from the Institute for Scientific Information (ISI) in Philadelphia, has been applied as a powerful and reliable tool for the comprehensive study of citation patterns (GARFIELD 1979). Introductory bibliometric analyses for sedimentological literature were already pres...

Journal: :journal of tethys 0

the badamu formation (upper toarcian-middle bajocian) mainly consists of limestone and shale and has is cropped out in east of iran. the badamu formation conformably overlays shemshak formation and is underlaid sharply by hojedk formation in kerman area and is underlaid gradually by baghamshah formation in tabas and southern khorasan areas. the aim of this work is petrographical study of rocks ...

The Etive igneous complex has intruded into Dalradian and Moine meta-sedimentary rocks in Devonian. Main rock types of the complex are granodiorite, monzodiorite, monzogranite, granite and diorite. Geochemical studies show that the magmas were of high K calc-alkaline, I-type and metaluminous nature. Application of discriminant diagrams to the Etive rocks indicates a possible within-plate tecton...

Journal: :journal of sciences islamic republic of iran 0

the etive igneous complex has intruded into dalradian and moine meta-sedimentary rocks in devonian. main rock types of the complex are granodiorite, monzodiorite, monzogranite, granite and diorite. geochemical studies show that the magmas were of high k calc-alkaline, i-type and metaluminous nature. application of discriminant diagrams to the etive rocks indicates a possible within-plate tecton...

2003
D. M. Sigman R. Robinson A. N. Knapp A. van Geen D. C. McCorkle R. C. Thunell

[1] Below its sill depth, the Santa Barbara Basin (SBB) is commonly suboxic ([O2] 3 mM), with only brief periods of ventilation. Associated with development of suboxia, the concentration of nitrate decreases with depth into the basin without an associated decrease in phosphate, indicating that a substantial fraction of the nitrate supplied to the basin is removed by denitrification. Coincident ...

2015
Gerald D. Pollack GERALD D. POLLACK Eirik J. Krogstad Andrey Bekker Gerald Daniel Pollack

The redox-sensitive geochemical behavior of uranium permits the use of Th/U ratios as a geochemical proxy for the oxidation state of the atmosphere and oceans during sedimentary processes. Due to the effects of post-depositional uranium mobility on Th/U ratios during events involving oxygenated fluids, direct measurements of Th/U ratios are often misleading, but the whole rock Pb isotope compos...

1999
Silvio Pantoja Cindy Lee

Proteinaceous material usually accounts for much of the total nitrogen and organic carbon in marine sediments. Thus, decomposition of protein is frequently investigated as a measure of labile organic matter turnover. The fraction of protein that escapes remineralization to CO2 undergoes transformations that may reflect pathways of preservation in sedimentary environments. We analyzed the molecu...

Journal: :GSA today 2021

Large datasets increasingly provide critical insights into crustal and surface processes on Earth. These data come in the form of published contributed observations, which often include associated metadata. Even best-case scenario a carefully curated dataset, it may be non-trivial to extract meaningful analyses from such compilations, choices made with respect filtering, resampling, averaging c...

Hamidreza Peyrowan Khosro Khosrotehrani Mojtaba Taghizade Razieh Lak Seyed Ali Aghanabati

The Wisconsin glaciation was started a approximately 125,000 years ago and reached its lowest extend between 20,000 to 21,000 years ago during which the sea level fell 120 to 130 meter. At the end of the ice age, about 18,000 years ago, the sea level increased and reached its present level about 5,000 years ago. The Persian Gulf was exposed in the last glacial moment (LGM). After this moment, t...

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