The iron content and optic axial angle in zoisites from Galicia, NW Spain

1985 ◽  
Vol 49 (350) ◽  
pp. 97-100 ◽  
Author(s):  
P. Maaskant
Keyword(s):  
Blue Light ◽  
Iron Content ◽  
Electron Probe ◽  
Metamorphic Rocks ◽  
High Grade ◽  
Nw Spain ◽  
Minor Elements ◽  
Axial Angle ◽  
Fe Content ◽  
Clear Relation

AbstractElectron probe microanalyses of zoisites from high-grade metamorphic rocks in Galicia, NW Spain have been obtained. The elements Na, Mg, P, K, Ti, and Mn were not detected above the 0.1 wt. % level. Assuming all Fe is present as Fe3+, a clear relation is obtained between the Fe content and the optic axial angle. Zoisite with 1.6 wt. % Fe2O3 proves to be uniaxial at 589 nm; uniaxiality in blue light (470 nm) lies at 1.5 wt. % Fe2O3. A change of the optic sign, from positive to negative, is obtained at 2.9 wt. % Fe2O3. The presence of minor elements greatly affects this relation, as is indicated by analyses of sector-zoned Sr-bearing zoisites of a muscovite-zoisite pegmatite from the same region. Under retrograde conditions Fe-rich α-zoisite reacts to form less Fe-rich α-zoisite or β-zoisite and clinozoisite.

Geochronology of high-grade metamorphic rocks from the Anjul area, Lut block, eastern Iran

2014 ◽  
Vol 82 ◽  
pp. 151-162 ◽  
Author(s):  
Michael Bröcker ◽  
Gholamreza Fotoohi Rad ◽  
Fateme Abbaslu ◽  
Nikolay Rodionov
Keyword(s):  
Metamorphic Rocks ◽  
High Grade ◽  
Lut Block ◽  
Eastern Iran

Zircon ages and the distribution of Archaean and Proterozoic rocks in the Rauer Islands

1993 ◽  
Vol 5 (2) ◽  
pp. 193-206 ◽  
Author(s):  
P. D. Kinny ◽  
L. P. Black ◽  
J. W. Sheraton
Keyword(s):  
Granulite Facies ◽  
Metamorphic Rocks ◽  
Low Grade ◽  
High Grade ◽  
Ion Microprobe ◽  
Rock Interaction ◽  
Mafic Rocks ◽  
Grade Fluid ◽  
Vestfold Hills ◽  
Intrusive Suite

The application of zircon U-Pb geochronology using the SHRIMP ion microprobe to the Precambrian high-grade metamorphic rocks of the Rauer Islands on the Prydz Bay coast of East Antarctica, has resulted in major revisions to the interpreted geological history. Large tracts of granitic orthogneisses, previously considered to be mostly Proterozoic in age, are shown here to be Archaean, with crystallization ages of 3270 Ma and 2800 Ma. These rocks and associated granulite-facies mafic rocks and paragneisses account for up to 50% of exposures in the Rauer Islands. Unlike the 2500 Ma rocks in the nearby Vestfold Hills which were cratonized soon after formation, the Rauer Islands rocks were reworked at about 1000 Ma under granulite to amphibolite facies conditions, and mixed with newly generated felsic crust. Dating of components of this felsic intrusive suite indicates that this Proterozoic reworking was accomplished in about 30–40 million years. Low-grade retrogression at 500 Ma was accompanied by brittle shearing, pegmatite injection, partial resetting of U-Pb geochronometers and growth of new zircons. Minor underformed lamprophyre dykes intruded Hop and nearby islands later in the Phanerozoic. Thus, the geology of the Rauer Islands reflects reworking and juxtaposition of unrelated rocks in a Proterozoic orogenic belt, and illustrates the important influence of relatively low-grade fluid-rock interaction on zircon U-Pb systematics in high-grade terranes.

scholarly journals Renewed tectonic extrusion of high-grade metamorphic rocks in the MCT footwall since Late Miocene (Sutlej Valley, India)

2008 ◽  
Vol 2 (4) ◽  
pp. 102-103 ◽  
Author(s):  
Vincent Baudraz ◽  
Jean-Claude Vannay ◽  
Elizabeth Catlos ◽  
Mike Cosca ◽  
Torsten Vennemann
Keyword(s):  
Late Miocene ◽  
Metamorphic Rocks ◽  
High Grade ◽  
Special Issue ◽  
Tectonic Extrusion

Himalayan Journal of Sciences Vol.2(4) Special Issue 2004 pp. 102-3

scholarly journals Evaluation of Recombinant Inbred Lines for Higher Iron and Zinc Content Along with Yield and Quality Parameters in Rice (Oryza sativa L.)

2020 ◽  
Author(s):  
Maini Bhattacharjee ◽  
Kasturi Majumder ◽  
Sabyasachi Kundagrami ◽  
Tapash Dasgupta
Keyword(s):  
Iron Content ◽  
Oryza Sativa L ◽  
Recombinant Inbred Lines ◽  
Zinc Content ◽  
Correlation Study ◽  
Inbred Lines ◽  
Quality Parameters ◽  
Fe Content ◽  
High Zinc ◽  
Iron And Zinc

Rice is one of the most important staple food crops for billions of people throughout the world. It is the cheapest source of dietary energy, protein and minerals for people but poor in micronutrients such as Fe and Zn to eliminate “hidden hunger”. In the present study, a population of 126recombinant inbred lines developed from a cross between Lemont X Satabdi (IET 4786) were used to identify high iron and zinc content coupled with yield and yield attributing traits. Analysis of Variance revealed that a considerable variation in iron and zinc existed among genotypes. The correlation study revealed that number of filled grain was positively associated with panicle length and yield per plant and number of panicles, but no significant positive correlation was observed between grain zinc content and iron content. Zinc and iron content of rice was estimated using Atomic Absorption Spectrophotometer and the samples were prepared by tri-acid digestion method. Among RIL lines, the line 57, 97,120, 48, 99, 124 contained more than 30 ppm Fe and the lines 24, 6, 9, 23, 29, 125 were found to possess more than 50 ppm Zn. The lines 9,6,48 and 57 were recorded to be high yielding with high zinc and Fe content in grain and in future these four lines look promising for multi location trial also. These high Fe and Zn content genotypes can be utilized in future breeding programme as a donor or good source for bio fortification of rice genotypes.

Concentration of Cs in high grade metamorphic rocks

1970 ◽  
Vol 9 (5) ◽  
pp. 416-420 ◽  
Author(s):  
K.S. Heier ◽  
A.O. Brunfelt
Keyword(s):  
Metamorphic Rocks ◽  
High Grade

Detecting Micro- and Nanoscale Variations in Element Mobility in High-Grade Metamorphic Rocks

2017 ◽  
pp. 277-291 ◽  
Author(s):  
Monika A. Kusiak ◽  
Simon A. Wilde ◽  
Richard Wirth ◽  
Martin J. Whitehouse ◽  
Daniel J. Dunkley ◽  
...  
Keyword(s):  
Metamorphic Rocks ◽  
High Grade ◽  
Element Mobility
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