scholarly journals Geochemical (REE and Trace elements) characteristics and tectonic setting discrimination of Permo-Carboniferous sandstone from Sikkim Lesser Himalaya, NE India

2021 ◽  
Vol 21 (5) ◽  
pp. 1-9
Author(s):  
Raj Kumar Priya ◽  
V. C. Tewari ◽  
R. K. Ranjan
Keyword(s):  
Trace Elements ◽  
Tectonic Setting ◽  
Lesser Himalaya ◽  
Ne India

scholarly journals Multi-Stage Evolution of Gold-Bearing Hydrothermal Quartz Veins at the Mokrsko Gold Deposit (Czech Republic) Based on Cathodoluminescence, Spectroscopic, and Trace Elements Analyses

Minerals ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 335 ◽  
Author(s):  
Vojtěch Wertich ◽  
Jaromír Leichmann ◽  
Marek Dosbaba ◽  
Jens Götze
Keyword(s):  
Trace Elements ◽  
Gold Deposit ◽  
Tectonic Setting ◽  
Emission Spectra ◽  
Titanium Concentration ◽  
Quartz Veins ◽  
Hydrothermal Quartz ◽  
Multi Stage ◽  
Regional Tectonic ◽  
Intrusive Suite

We performed a detailed analysis of hydrothermal quartz at the Mokrsko gold deposit (Čelina, Mokrsko-East, and Mokrsko-West deposits). Twenty-one samples were studied by scanning electron microscopy cathodoluminescence (CL) imagining, CL emission spectra and trace elements were measured on six selected samples. Four quartz growth generations Q1 to Q4 were described. Homogeneous early blue CL Q1 with initial emission spectra at 380 and 500 nm was observed at the Čelina deposit with typical titanium concentrations in the range of 20–50 ppm. Hydrothermal quartz at Mokrsko-West, which also includes early Q1, late subhedral faces of yellow CL Q2, and microfissures of greenish CL Q3 (both 570 nm), is characterized by titanium depletion. The titanium concentration is comparable to previous studies of crystallization temperatures proving titanium concentration in quartz as a good geothermal indicator. Q4, developed in microfissures only at Čelina, has no visual CL effect. Mokrsko-West is specific in comparison to Mokrsko-East and Čelina by germanium enrichments in hydrothermal quartz (up to 17 ppm) and the presence of fluorite. Tectonic (sheeted veinlets system, regional tectonic setting) and geochemical (germanium in quartz, the presence of fluorite) characteristics of the quartz veins link the late mineralization stages at the Mokrsko-West deposit to the temporally related Blatná intrusive suite.

Geochemical patterns in Norwegian greenstones

1982 ◽  
Vol 19 (3) ◽  
pp. 385-397 ◽  
Author(s):  
G. H. Gale ◽  
J. A. Pearce
Keyword(s):  
Trace Elements ◽  
Rare Earth ◽  
Trace Element ◽  
Tectonic Setting ◽  
Major Elements ◽  
Island Arc ◽  
Ocean Floor ◽  
Spreading Axis ◽  
Southern Norway ◽  
Representative Samples

Representative samples of Caledonian greenstones from the Grong, Joma, Løkken, Støren, Stavenes, and Bømlo areas in central and southern Norway have been analysed for major elements and over 20 trace elements. Ocean-floor tholeiite-normalized trace-element patterns and chondrite-normalized rare-earth patterns both provide clues to the genesis, original tectonic setting, petrologic character, and effects of alteration of these greenstones. We conclude that the Støren, Stavenes, and Løkken greenstones were generated at spreading axes within the Caledonian ocean, the Grong and possibly the Bømlo submarine greenstones were erupted in an island-arc system, and the Joma and Bømlo subaerial greenstones were erupted in a within-plate setting. The Løkken greenstones may have been generated in a marginal basin, whereas those from Støren and Stavenes were probably generated at a rapidly spreading axis in a major ocean.

Geochronology and trace elements of zircon in the Southern Chinese Altay: Implications for tectonic setting

2021 ◽  
Author(s):  
Lei Niu ◽  
Tao Hong ◽  
Xing‐Wang Xu ◽  
Xue‐Hai Wang ◽  
Hang Li ◽  
...  
Keyword(s):  
Trace Elements ◽  
Tectonic Setting ◽  
Southern Chinese
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