Sur la composition chimique moyenne des amphibolites

1953 ◽  
Vol S6-III (1-3) ◽  
pp. 153-173 ◽  
Author(s):  
Pierre Lapadu-Hargues
Keyword(s):  
Chemical Composition ◽  
Sedimentary Rocks ◽  
Point Of View ◽  
Igneous Rocks ◽  
Chemical Analyses ◽  
Average Chemical Composition ◽  
Composition Chimique

Abstract In a majority of cases, amphibolites derived from sedimentary rocks can be distinguished from those derived from dioritic or gabbroic igneous rocks on the basis of average chemical composition. From the purely chemical point of view, it is possible to consider that eclogites result from metamorphism of certain types of heteromorphic gabbros such as the ariegites,and ultimately give rise to amphibolitic rocks. Chemical analyses are included.

scholarly journals X.—Diagram of Composition of Igneous Rocks

1900 ◽  
Vol 7 (6) ◽  
pp. 273-275
Author(s):  
H. Warth
Keyword(s):  
Chemical Composition ◽  
Igneous Rocks ◽  
Average Chemical Composition ◽  
Average Composition

Recent studies about the average chemical composition of larger numbers of igneous rocks in the aggregate have shown that figures obtained from any one hundred or more samples are very similar, in fact practically equal. (See A. Harker, “On the Average Composition of British Igneous Rocks”: Geol. Mag., No. V, May, 1899.) This will be found also the case when comparing the following average which I calculated from the analysis of igneous rocks compiled by Roth in his “Petrographie der plutonischen Gesteine.”

scholarly journals CONTENT OF EXTRACTIVE SUBSTANCES IN THE PINE WOOD UNDER VARIOUS GROWTH CONDITIONS

2001 ◽  
Vol 1 ◽  
pp. 14
Author(s):  
Dace Cīrule ◽  
Ilzīte Lavnikoviča ◽  
Anda Alksne ◽  
Jurijs Hrols
Keyword(s):  
Chemical Composition ◽  
Pinus Sylvestris ◽  
Growth Conditions ◽  
Point Of View ◽  
Hot Water ◽  
Chemical Analyses ◽  
Forest Types ◽  
Pine Wood ◽  
Pine Trees ◽  
Extractive Substances

Studies of the chemical composition of Pinus sylvestris L. were performed. The studies embraced all the largest pine populations and the most spread forest types in Latvia. Samples for chemical analyses were taken in 4 stem heights, separately from sapwood and core. The obtained results indicate that the content of cellulose and lignin for trees from different regions and forest types in one stem localization differs moderately. The essential distinctions from the point of view of the chemical composition of pine wood suggests only the extractives content in wood. Common tendencies are observed for the distribution of extractives (EBE) throughout the stem for trees both different regions and forest types. In all stem heights EBE are more in core than in sapwood. To assess the effect of growth conditions on EBE content the results obtained for the same localization in the stem were compared. In all forest types and regions the EBE content in wood is higher as compared with the wood from less ecologically touched regions. In addition the substances extractable with hot water (WE) were determined. It is characteristic that both EBE and WE are less in pine trees grown in drained areas.

Les roches filoniennes basiques de la rade de Brest; kersantites et dolerites

1961 ◽  
Vol S7-III (4) ◽  
pp. 387-396 ◽  
Author(s):  
Danielle Metais
Keyword(s):  
Chemical Composition ◽  
Sedimentary Rocks ◽  
Igneous Rocks ◽  
The North ◽  
Basic Rocks

Abstract The Brest harbor region, western Brittany, France, is located in a synclinorium of Devonian sedimentary rocks, bounded on the north and east by granite and gneiss and cut by numerous bodies of igneous rocks ranging in chemical composition from acidic (microgranite) to basic (dolerite and lamprophyre). Three types are distinguished among the basic rocks--pyroxene-poor dolerite, dark-colored pyroxene kersantite, and light-colored micaceous kersantite. They are considered to represent a continuous petrogenetic sequence.

Bridge River tephra: revised distribution and significance for detecting old carbon errors in radiocarbon dates of limnic sediments in southern British Columbia

1980 ◽  
Vol 17 (11) ◽  
pp. 1454-1461 ◽  
Author(s):  
Rolf W. Mathewes ◽  
John A. Westgate
Keyword(s):  
British Columbia ◽  
Sedimentary Rocks ◽  
Lacustrine Sediments ◽  
Igneous Rocks ◽  
The South ◽  
Radiocarbon Dates ◽  
Carbon Contamination ◽  
Horseshoe Lake ◽  
Tephra Beds

Ash-grade Bridge River tephra, identified as such on the basis of shard habit, modal mineralogy, and composition of ilmenite, occurs in sedimentary cores from three lakes located to the south of the previously documented plume and necessitates a significant enlargement of the fallout area of that tephra in southwestern British Columbia.These new, more southerly occurrences are probably equivalent to the ~2350 year old Bridge River tephra, although it can be argued from the evidence at hand that the 14C dates and biotite-rich nature support relationship to a slightly earlier Bridge River event.Large differences exist in the 14C age of sediments immediately adjacent to the Bridge River tephra at these three lake sites; maximum ages of 3950 ± 170 years BP (GX-5549) and 3750 ± 210 years BP (I-10041) were obtained at Phair and Fishblue lakes, respectively, whereas the corresponding age at Horseshoe Lake is only 2685 ± 180 years BP (GX-5757). The two older dates are considered to be significantly affected by old carbon contamination for the bedrock locally consists of calcareous sedimentary rocks and the lacustrine sediments are very calcareous. The 14C date from Horseshoe Lake, which occurs in an area of igneous rocks, appears to be only slightly too old relative to the ~2350 year old Bridge River tephra.Well-dated tephra beds, therefore, can be very useful in assessing the magnitude of old carbon errors associated with radiocarbon dates based on limnic sediments. Calcareous gyttja deposits beneath Bridge River tephra within the study area exhibit old carbon errors of the order of 1350–1550 years.

A Road Section near Guy's Hill, Jamaica

1942 ◽  
Vol 79 (4) ◽  
pp. 241-252 ◽  
Author(s):  
C. A. Matley ◽  
Frank Raw
Keyword(s):  
Sedimentary Rocks ◽  
Plutonic Rock ◽  
Igneous Rocks ◽  
The Road ◽  
Road Section ◽  
Igneous Intrusions ◽  
Microscope Slides

The rocks exposed along the road between Linstead and Guy's Hill, Jamaica, were described by Dr. C. T. Trechmann in this magazine in 1936 (pp. 259–260). The chief object of his account was to prove that the igneous rocks there were intrusions later than the associated Cretaceous and Tertiary limestones, which, according to him, had been metamorphosed into hornfelses, some of which, he stated later (1937, p. 561), he knew to have an “igneous” appearance under the microscope, “which tends to support my contention that in Jamaica we have sedimentaries altered in situ into rocks that would ordinarily be classified as igneous.” Dissent from his descriptions and interpretations was expressed by C. A. M. (Matley, 1937, pp. 501–3), the criticisms being mainly based on an examination of Trechmann's own microscope slides by F. R. A visit to Jamaica by C. A. M. in 1939 allowed him to study this road and to collect a suite of rocks for petrological examination. The results show that Trechmann's interpretation cannot be sustained. There is no granodiorite or other plutonic rock present, no metamorphism hornfelsing the sedimentary rocks, and no igneous intrusions into the Tertiary limestones.

scholarly journals Chemical Composition and Functional Properties of Dietary Fibre Concentrates from Winemaking By-Products: Skins, Stems and Lees

Foods ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 1510
Author(s):  
María Ángeles Rivas ◽  
Rocío Casquete ◽  
María de Guía Córdoba ◽  
Santiago Ruíz-Moyano ◽  
María José Benito ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Functional Properties ◽  
Dietary Fibre ◽  
Water Retention ◽  
Point Of View ◽  
Water Retention Capacity ◽  
Retention Capacity ◽  
Oil Retention ◽  
High Antioxidant Activity ◽  
By Products

The objective of this study was to evaluate, from a technological and nutritional point of view, the chemical composition and functional properties of the industrial winemaking by-products, namely skins, stems and lees. The chemical and physical characteristics, as well as the functional properties (fat and water retention and swelling capacity, antioxidant capacity, and their prebiotic effect), of the dietary fibre of these by-products were studied. The results showed that the skins, stems, and lees are rich in fibre, with the stem fibre containing the highest amounts of non-extractable polyphenols attached to polysaccharides with high antioxidant activity and prebiotic effect. Lee fibre had the highest water retention capacity and oil retention capacity. The results reveal that winemaking by-products could be used as a source of dietary fibre with functional characteristics for food applications.

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