Geochemical features of some Archaean and post-Archaean high-magnesian-low-alkali liquids

1980 ◽  
Vol 297 (1431) ◽  
pp. 365-381 ◽  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Partial Melting ◽  
Incompatible Element ◽  
Light Rare Earth ◽  
Baffin Bay ◽  
Group 2 ◽  
Mafic Lavas ◽  
Light Rare Earth Elements

High-magnesian-low-alkali liquids are found as mafic lavas ranging in age from Archaean to Gainozoic. The most magnesian lavas are represented by Archaean spinifex textured peridotitic komatiites, and in this study these liquids are used as a comparative base for younger, less magnesian liquids. The post-Archaean lavas fall into three categories: (1) the Gape Smith (Proterozoic) - Baffin Bay (Gainozoic) group, (2) the low-Ti ophiolitic basalts of Cyprus, which represent remelting of a sequentially depleted source, and (3) the boninite group, which are the products of (wet?) melting of a source that had previously experienced depletion and addition of incompatible element enriched phases. With the use of parameters such as Al 2 O 3 /TiO 2 , Sc/Zr, Ti/V, a comparison of Archaean komatiites with the younger high magnesian lavas indicates that the bulk of the variation seen in these rocks types can be interpreted in terms of the amount of partial melting and nature of residual phases. However, some of the variability that occurs within individual lava provinces (particularly among the light rare earth elements) is best explained by a heterogeneity superimposed on a previously homogeneous source. The abundance of high-magnesian liquids declines sharply after the Archaean as does the maximum MgO content achieved by the lavas.

Depletion of light rare-earth elements in felsic magmas

Geology ◽  
1982 ◽  
Vol 10 (3) ◽  
pp. 129 ◽  
Author(s):  
Calvin F. Miller ◽  
David W. Mittlefehldt
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Light Rare Earth ◽  
Light Rare Earth Elements

Recycling and substitution of light rare earth elements, cerium, lanthanum, neodymium, and praseodymium from end-of-life applications - A review

2019 ◽  
Vol 236 ◽  
pp. 117573 ◽  
Author(s):  
Linda Omodara ◽  
Satu Pitkäaho ◽  
Esa-Matti Turpeinen ◽  
Paula Saavalainen ◽  
Kati Oravisjärvi ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
End Of Life ◽  
Light Rare Earth ◽  
Light Rare Earth Elements

Significance of the metasomatized lithospheric mantle in the formation of early basalts and Cu – platinum group element sulfide mineralization in the Coldwell Complex, Midcontinent Rift, Canada

2019 ◽  
Vol 56 (7) ◽  
pp. 693-714 ◽  
Author(s):  
David J. Good ◽  
Peter C. Lightfoot
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Trace Element ◽  
Lithospheric Mantle ◽  
Group Element ◽  
Light Rare Earth ◽  
Midcontinent Rift ◽  
Northern Margin ◽  
Lithospheric Mantle Source ◽  
Light Rare Earth Elements

A diverse suite of tholeiitic to alkaline basalt and gabbroic intrusions located in the Coldwell Complex on the northern margin of the Midcontinent Rift exhibit unusual trace element signatures that show enriched large ion lithophile elements and light rare earth elements with negative Nb and Zr anomalies. These features are not typical of magmas derived by partial melting within or above a rising mantle plume, as might be expected in an early Midcontinent Rift magmatic event. In this paper, we provide a detailed geochemical study of a 500 m thick sequence of metabasalt that represents the earliest stage of magmatism in the Coldwell Complex. We show that contamination or crystallization processes or subsequent metasomatism cannot explain the trace element variations. Instead, we propose partial melting in a metasomatized Subcontinental Lithospheric Mantle source to explain the decoupled behavior of large ion lithophile elements from light rare earth elements and heavy rare earth elements and rare earth elements from high field strength elements and the enriched Nd isotope signature of metabasalt. Similar features occur in unit 5b of the Mamainse Point Volcanic Group located at the northern margin of the Rift. An objective of this paper is to relate Two Duck Lake gabbro, host rock for low-sulfur, high precious metal sulfide mineralization at the Marathon deposit, to the metabasalt sequence. The excellent match of trace element abundances in Two Duck Lake gabbro to metabasalt unit 3 confirms an early Coldwell Complex age for metabasalt and a Subcontinental Lithospheric Mantle source for Cu – platinum group element mineralized gabbros.

scholarly journals Geochemical Characteristics of Dolomitic Phosphorite Containing Rare Earth Elements and Its Weathered Ore

Minerals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 416 ◽  
Author(s):  
Shuai Li ◽  
Jie Zhang ◽  
Huaifa Wang ◽  
Caili Wang
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Test Method ◽  
Isomorphic Substitution ◽  
Leaching Test ◽  
Light Rare Earth ◽  
Marine Sedimentation ◽  
Mineralogical Characteristics ◽  
Development And Utilization ◽  
Light Rare Earth Elements

In order to provide a good theoretical guidance for the development and utilization of weathered phosphorite resources, we investigated the geochemical and mineralogical characteristics of primary and weathered phosphorites. The analysis of trace elements showed that the primary ore has hydrothermal sedimentation effect in the later stage, the weathered ore has obvious residual enrichment and the phosphate ore belongs to clastic lithologic phosphate rock. In addition, through leaching test method, it was shown that rare earth elements are present in fluorapatite in the form of isomorphic substitution, and the proportion of rare earth elements adsorbed on clay and other minerals was likely to be between 2% and 3%. The light rare earth elements are relatively enriched in both primary and weathered phosphorite, and Ce and Eu have obvious negative anomalies. The primary phosphorite is a dolomitic phosphorite containing rare earth elements, which are naturally enriched by weathering, and its weathered ore has obvious residual enrichment, while the deposit was characterized by normal marine sedimentation and hydrothermal action.

Adsorption/desorption Behaviors of Light Rare Earth Elements (Ce and Nd) using Lewatit VP OC 1026

2015 ◽  
Vol 52 (4) ◽  
pp. 353-363
Author(s):  
Won Geun Lee ◽  
Joung Woon Kim ◽  
Sungeun Lee ◽  
Insung Hwang ◽  
Hong Myeong Jeon ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Light Rare Earth ◽  
Adsorption Desorption ◽  
Light Rare Earth Elements
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