scholarly journals Extreme heterogeneity in sr isotope systematic in the himalayan leucogranites: A possible mechanism of partial melting based on thermal modeling

2001 ◽  
Vol 110 (2) ◽  
pp. 161-169
Author(s):  
Dilip K Mukhopadhyay
Keyword(s):  
Partial Melting ◽  
Thermal Modeling ◽  
Sr Isotope ◽  
Isotope Systematic

S-type granite formation in the Dalradian rocks of Connemara, W. Ireland

1990 ◽  
Vol 54 (374) ◽  
pp. 1-22 ◽  
Author(s):  
Y. Ahmed-Said ◽  
B. E. Leake
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Partial Melting ◽  
Fission Track ◽  
Sr Isotope ◽  
Crustal Rocks ◽  
Granite Formation ◽  
Type Granite ◽  
Gabbroic Intrusion ◽  
Detailed Picture

AbstractThe vicinity of the 490 Ma Cashel gabbroic intrusion experienced pressures of about 4.05 ± 0.2 kbar and temperatures in excess of 850 °C. These conditions caused intense hornfelsing and partial melting of the surrounding Dalradian metasediments. From the study of the progressively changed composition of the aureole hornfelses it is deduced that elements were fractionated into the melts as follows: Si>K>Na>Ca>Mn>Al>Fe>Mg and Rb>Ba>Sr>Ga>Cr,Ni,Co. This order of fractionation, which is the opposite to that in magmatic crystallization, provides a detailed picture of the mode of interaction between a mantle derived basic magma and mid-crustal rocks, illustrating how one type of S-type granite can be produced. The rare earth elements (REE) were both removed and fractionated but Eu largely remained in the crystal fractions giving increasing positive Eu anomalies with rising partial melting and these trends can be explained by the extraction of a granitic melt from the hornfelses. Fission track mapping of U is used to study the behaviour of U within the aureole and the metamorphic recrystallization of detrital brown zircon to pink new zircon. The S-type Cashel microgranite sill is shown to have been derived by anatexis from the Dalradian rocks, to have preserved the Sr isotope ratios of the metasediments at 490 Ma, and not to be of the same composition as the leucosomes in the metasediments.

Geochemistry of late Caledonian minettes from Northern Britain: implications for the Caledonian sub-continental lithospheric mantle

1996 ◽  
Vol 60 (398) ◽  
pp. 221-236 ◽  
Author(s):  
Jason C. Canning ◽  
P. J. Henney ◽  
M. A. Morrison ◽  
J. W. Gaskarth
Keyword(s):  
Trace Elements ◽  
Partial Melting ◽  
Fractional Crystallization ◽  
Lithospheric Mantle ◽  
Sr Isotope ◽  
Crustal Assimilation ◽  
Continental Lithospheric Mantle ◽  
Compositional Changes ◽  
Tectonic Dislocations

AbstractThe geochemistry of late Caledonian minettes from across the orogenic belt is compared in order to constrain the composition of the Caledonian sub-continental lithospheric mantle (SCLM). All the minettes are similar petrographically and chemically and several samples have characteristics typical of near primary mantle melts. Samples from the Northern Highlands and the Caledonian foreland show enrichment in many trace elements (notably LILE and LREE) relative to those from the Grampians, the Southern Uplands and northern England, coupled with distinct Nd and Sr isotope characteristics. Processes such as fractional crystallization, crustal assimilation, and partial melting played a negligible role in creating the differences between the two groups which reflect long-term, time-integrated differences in the compositions of their SCLM sources. The Great Glen Fault appears to represent the boundary between these two lithospheric mantle domains. Other currently exposed Caledonian tectonic dislocations cannot be correlated directly with compositional changes within the SCLM. The chemical provinciality displayed by the minettes shows some resemblance to that within other late Caledonian igneous suites, including the newer granites, suggesting that the minettes may represent the lithospheric mantle contributions to these rocks.

Rare-earth and other trace element data bearing on the origin of Archaean granitic rocks from Yellowknife, Northwest Territories

1979 ◽  
Vol 16 (4) ◽  
pp. 809-815 ◽  
Author(s):  
S. A. Drury
Keyword(s):  
Rare Earth ◽  
Trace Element ◽  
Partial Melting ◽  
Northwest Territories ◽  
Granitic Rocks ◽  
Trace Element Data ◽  
Sr Isotope ◽  
Isotope Data ◽  
Element Data ◽  
Ree Patterns

Trace element data, including rare-earth elements, for six granitic rocks and two metasediments from the Archaean granite–greenstone terrain of Yellowknife, Northwest Territories are presented. Three granodiorites from the synkinematic Western and South-east plutons show similar Rb, Sr, Th, Rb/Sr, and K/Rb to many high level granodiorites, but are enriched in Ba. Their rare-earth element (REE) patterns show enrichment of light REE relative to heavy REE, and lack Eu anomalies. These features, together with Sr isotope data, are compatible with their origin by partial melting of mantle depth garnet-bearing basaltic source rocks, and little if any detectable fractionation of the rising magma. Potassic granites from post-kinematic plutons, such as the Prosperous Lake granite, are enriched in Th, depleted in Sr and Eu, and have very high Rb/Sr ratios and low K/Rb ratios. Their REE patterns, except for Eu, are very similar to those of metasediments which they intrude. These features, together with Sr isotope data, suggest that high degrees of partial melting of metasediments, leaving a plagioclase-rich residue, are the most likely origin for the post-kinematic granites. The REE patterns of the Archaean metasediments, in particular their high CeN/YbN ratios, suggest that they contain a high proportion of material derived from earlier sialic crust, and that local metavolcanic rocks are not clearly reflected in the composition of the stratigraphically younger metasediments.

THERMAL MODELING OF ICE-PACKS IN COOLING VESTS FOR EXTREME HOT CLIMATIC CONDITION: A NUMERICAL APPROACH

2018 ◽  
Author(s):  
Vedant Bhuyar ◽  
Shiv Ram Suthar ◽  
Mohit Vijay ◽  
Prodyut R. Chakraborty
Keyword(s):  
Climatic Condition ◽  
Thermal Modeling ◽  
Numerical Approach

TRANSIENT THERMAL MODELING OF A FOUR-STROKE INTERNAL COMBUSTION ENGINE EXHAUST VALVE

2019 ◽  
Author(s):  
Mert Alpaya ◽  
Iskender Kayabasi ◽  
Burag Hamparyan ◽  
Orcun Aslan
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Thermal Modeling ◽  
Internal Combustion ◽  
Exhaust Valve ◽  
Engine Exhaust ◽  
Transient Thermal

Thermal Modeling of Biological Mustard Hydrolysate Treatment Reactors and Full-Scale Simulated Testing at the Pueblo Chemical Agent-Destruction Pilot Plant

2015 ◽  
Vol 2015 (6) ◽  
pp. 5907-5927
Author(s):  
Paul J Usinowicz ◽  
George Lecakes ◽  
Thomas C Spear ◽  
Zack Burger ◽  
Charles Oclassen ◽  
...  
Keyword(s):  
Pilot Plant ◽  
Thermal Modeling ◽  
Full Scale ◽  
Chemical Agent

Seismic evidence for a narrow zone of partial melting underlying the East Pacific Rise at 21°N

1977 ◽  
Vol 88 (5) ◽  
pp. 678 ◽  
Author(s):  
IAN REID ◽  
JOHN A. ORCUTT ◽  
WILLIAM A. PROTHERO
Keyword(s):  
Partial Melting ◽  
East Pacific Rise ◽  
Narrow Zone ◽  
East Pacific

Does CO2 cause partial melting in the low-velocity layer of the mantle?: Comment and reply

Geology ◽  
1976 ◽  
Vol 4 (12) ◽  
pp. 787 ◽  
Author(s):  
David H. Eggler
Keyword(s):  
Partial Melting ◽  
Low Velocity ◽  
Low Velocity Layer ◽  
Velocity Layer
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