Lead-isotope and trace-element geochemistry of Paleoproterozoic metasedimentary rocks in the Lead and Rochford basins (Black Hills, South Dakota, USA): Implications for genetic models, mineralization ages, and sources of leads in the Homestake gold deposit

2009 ◽  
Vol 172 (1-2) ◽  
pp. 1-24 ◽  
Author(s):  
Robert Frei ◽  
Peter S. Dahl ◽  
Mie Munck Frandsson ◽  
Lizette Apel Jensen ◽  
Thomas Rintza Hansen ◽  
...  
Keyword(s):  
South Dakota ◽  
Trace Element ◽  
Gold Deposit ◽  
Lead Isotope ◽  
Black Hills ◽  
Genetic Models ◽  
Trace Element Geochemistry ◽  
Element Geochemistry ◽  
Metasedimentary Rocks

Major and trace element geochemistry of emerald from several deposits: Implications for genetic models and classification schemes

2018 ◽  
Vol 94 ◽  
pp. 351-366 ◽  
Author(s):  
Carlo Aurisicchio ◽  
Aida M. Conte ◽  
Laura Medeghini ◽  
Luisa Ottolini ◽  
Caterina De Vito
Keyword(s):  
Trace Element ◽  
Genetic Models ◽  
Trace Element Geochemistry ◽  
Element Geochemistry ◽  
Classification Schemes

Significance of zircon trace element geochemistry, the Shihu gold deposit, western Hebei Province, North China

2011 ◽  
Vol 29 (3) ◽  
pp. 277-286 ◽  
Author(s):  
Ye CAO ◽  
Shengrong LI ◽  
Huafeng ZHANG ◽  
Xiaobin LIU ◽  
Zhenzhen LI ◽  
...  
Keyword(s):  
Trace Element ◽  
Gold Deposit ◽  
North China ◽  
Hebei Province ◽  
Trace Element Geochemistry ◽  
Element Geochemistry

Textures and trace element geochemistry of magnetite in the Beiya gold deposit, SW China

2021 ◽  
Author(s):  
Jingxin Hong ◽  
Hongyu Zhang ◽  
Ye Yuan ◽  
Jichun Wang ◽  
Fangyue Wang ◽  
...  
Keyword(s):  
Trace Element ◽  
Gold Deposit ◽  
Trace Element Geochemistry ◽  
Element Geochemistry ◽  
Sw China

scholarly journals Trace-element and Sr and Nd isotopic geochemistry of Cretaceous bentonites in Wyoming and South Dakota tracks magmatic processes during eastward migration of Farallon arc plutons

2020 ◽  
Author(s):  
Jeffrey S. Hannon ◽  
Craig Dietsch ◽  
Warren D. Huff
Keyword(s):  
South Dakota ◽  
Trace Element ◽  
Temporal Trends ◽  
Western Montana ◽  
Trace Element Geochemistry ◽  
Element Geochemistry ◽  
Data Set ◽  
Isotopic Compositions ◽  
Clay Deposits ◽  
Magmatic Processes

Bentonite beds, which are clay deposits produced by the submarine alteration of volcanic tephra, preserve millions of years of volcanic products linked to magmatic systems for which records are otherwise lost through erosion and alteration. Cretaceous strata from the Bighorn Basin, Wyoming, and southwestern South Dakota contain bentonites that originated from arc magmatism produced by subduction of the Farallon plate. We analyzed the bulk major- and trace-element geochemistry, and the 87Sr/86Sr (n = 87) and 143Nd/144Nd (n = 26) isotopic compositions of individual bentonite beds from these areas spanning 40 m.y. of volcanism to recover signals of magmatic processes and to attempt to trace bentonite geochemical and isotopic signatures to contemporaneous Cordilleran plutonic rocks. Using multiple immobile elements (e.g., Zr, TiO2, Nb, Ta, and rare earth elements), distinct temporal trends show variations in the effects of mineral fractionation and changes in crustal thickness. Bentonite Sr and Nd isotopic compositions allow ash beds to be correlated with specific batholithic complexes in Idaho and western Montana. With this data set, we observed the following: (1) The volcanic arc migrated across the 0.706 isopleth between 115 and 105 Ma; (2) between 105 and 95 Ma, magmatism stalled in central Idaho and was supported through significant MASH (mixing-assimilation-storage-homogenization) processing; (3) by 85 Ma, a shallowing subduction angle resulted in the eastward migration of the volcanic front into western Montana while volcanism in Idaho diminished; and (4) around 75 Ma, evidence of Idaho volcanism is lost. Montana plutonism continued with significant assimilation of radiogenic basement and regional centers of local magma emplacement (i.e., Pioneer batholith).

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