scholarly journals Supplemental Material: The western Hayfork terrane: Remnants of the Middle Jurassic arc in the Klamath Mountain province, California and Oregon

2020 ◽  
Author(s):  
C.G. Barnes ◽  
M.A. Barnes
Keyword(s):  
Trace Element ◽  
Middle Jurassic ◽  
Major Element ◽  
Bulk Rock ◽  
Mountain Province ◽  
Klamath Mountain

Table S1: Locations and lithology of analyzed samples. Table S2: Calculated temperatures and pressures of augite and amphibole crystallization. Table S3: Major-element compositions of clinopyroxene. Table S4: Major-element compositions of amphibole. Table S5: Trace-element compositions of clinopyroxene and amphibole. Table S6: Bulk-rock compositions of the Forks of Salmon pluton.<br>

scholarly journals Supplemental Material: The western Hayfork terrane: Remnants of the Middle Jurassic arc in the Klamath Mountain province, California and Oregon

2020 ◽  
Author(s):  
C.G. Barnes ◽  
M.A. Barnes
Keyword(s):  
Trace Element ◽  
Middle Jurassic ◽  
Major Element ◽  
Bulk Rock ◽  
Mountain Province ◽  
Klamath Mountain

Table S1: Locations and lithology of analyzed samples. Table S2: Calculated temperatures and pressures of augite and amphibole crystallization. Table S3: Major-element compositions of clinopyroxene. Table S4: Major-element compositions of amphibole. Table S5: Trace-element compositions of clinopyroxene and amphibole. Table S6: Bulk-rock compositions of the Forks of Salmon pluton.<br>

scholarly journals Supplemental Material: The western Hayfork terrane: Remnants of the Middle Jurassic arc in the Klamath Mountain province, California and Oregon

2020 ◽  
Author(s):  
C.G. Barnes ◽  
M.A. Barnes
Keyword(s):  
Trace Element ◽  
Middle Jurassic ◽  
Major Element ◽  
Bulk Rock ◽  
Lower Hemisphere ◽  
Mountain Province ◽  
Klamath Mountain

<div>Figure S1: Representative structural section of western Hayfork terrane in the Boise Saddle area, with a lower-hemisphere stereogram of poles to bedding. Figure S2: Outcrop photos of western Hayfork terrane taken along the measured section indicated in Figure 1. A. Cobble-rich lahar deposit. B. Laminated crystal-lithic arenite. Table S1: Locations and lithology of analyzed samples. Table S2: Calculated temperatures and pressures of augite and amphibole crystallization. Table S3: Major-element compositions of clinopyroxene. Table S4: Major-element compositions of amphibole. Table S5: Trace-element compositions of clinopyroxene and amphibole. Table S6: Bulk-rock compositions of the Forks of Salmon pluton.<br></div><div><br></div>

scholarly journals Supplemental Material: The western Hayfork terrane: Remnants of the Middle Jurassic arc in the Klamath Mountain province, California and Oregon

2020 ◽  
Author(s):  
C.G. Barnes ◽  
M.A. Barnes
Keyword(s):  
Trace Element ◽  
Middle Jurassic ◽  
Major Element ◽  
Bulk Rock ◽  
Lower Hemisphere ◽  
Mountain Province ◽  
Klamath Mountain

<div>Figure S1: Representative structural section of western Hayfork terrane in the Boise Saddle area, with a lower-hemisphere stereogram of poles to bedding. Figure S2: Outcrop photos of western Hayfork terrane taken along the measured section indicated in Figure 1. A. Cobble-rich lahar deposit. B. Laminated crystal-lithic arenite. Table S1: Locations and lithology of analyzed samples. Table S2: Calculated temperatures and pressures of augite and amphibole crystallization. Table S3: Major-element compositions of clinopyroxene. Table S4: Major-element compositions of amphibole. Table S5: Trace-element compositions of clinopyroxene and amphibole. Table S6: Bulk-rock compositions of the Forks of Salmon pluton.<br></div><div><br></div>

scholarly journals The western Hayfork terrane: Remnants of the Middle Jurassic arc in the Klamath Mountain province, California and Oregon

Geosphere ◽  
2020 ◽  
Vol 16 (4) ◽  
pp. 1058-1081
Author(s):  
Calvin G. Barnes ◽  
Melanie A. Barnes
Keyword(s):  
Trace Element ◽  
Middle Jurassic ◽  
Regional Metamorphism ◽  
Sedimentary Rocks ◽  
Trace Element Analysis ◽  
Arc Magmatism ◽  
Bulk Rock ◽  
Element Analysis ◽  
Mountain Province ◽  
Klamath Mountain

Abstract Arc magmatism was widespread in the Cordillera of North America during Middle Jurassic time. The predominant representative of this arc magmatism in the Klamath Mountain province is the western Hayfork terrane (WHT). This terrane is primarily metasedimentary, consisting mainly of crystal-lithic arenite, argillitic sediments and lahar deposits, rare lavas, and sparse quartz-rich arenite. Because lavas are rare, petrologic study using bulk-rock compositions is restricted to analysis of cobbles in lahar deposits. Moreover, the WHT underwent greenschist-facies regional metamorphism with consequent modification of bulk-rock compositions. However, many of the sandstones preserve igneous clinopyroxene and calcic amphibole, which were phenocrysts in the original volcanic rocks. Major- and trace-element compositions of the magmatic pyroxene and amphibole permit reconstruction of the range of rock types eroded from the arc, specifically scant basalt, volumetrically dominant basaltic andesite and andesite, and smaller but significant amounts of dacite and rhyodacite. Eruptive temperatures reached ∼1180 °C and may have been as low as ∼800 °C on the basis of pyroxene and amphibole thermometry, with most eruptive temperatures &gt;1000 °C. On the basis of augite compositions, WHT magmatism is divided into two suites. One features high-Mg augite with high abundances of Cr and Sr, high Sr/Y and Nd/Yb values, and low Y and heavy rare-earth elements (REE). These compositions are typical of high-Mg andesite and dacite suites in which garnet is a residual mineral, most probably in a metasomatized upper mantle setting. The other suite contains augite with lower Sr, Sr/Y, and Nd/Yb; these features are typical of normal calc-alkaline magmas. Augite from a coeval pluton emplaced inboard of the western Hayfork outcrop belt is similar to augite from the low-Sr group of WHT samples. In contrast, augite from the Ironside Mountain pluton, previously considered the plutonic equivalent of WHT sediments, is Fe-rich, with low Cr and Sr and relatively high Zr and REE. Previous suggestions that the Ironside Mountain pluton is correlative with the WHT are not supported by these data. The magmatic diversity of the WHT is typical of the modern Aleutian and Cascade arcs, among others, and could reflect subduction of relatively young oceanic lithosphere or fragmentation of the subduction slab. Although we favor the former setting, present data cannot rule out the latter. The presence of scant quartz-rich sedimentary rocks within the predominantly volcanogenic WHT is consistent with deposition as a sedimentary apron associated with a west-facing magmatic arc with late-stage input from cratonal sources. The results of this study indicate that detailed petrographic study of arc-derived sedimentary rocks, including major- and trace-element analysis of preserved magmatic phases, yields information about magmatic affinities, processes, and temperatures.

AUGITE TRACKS CHANGES IN JURASSIC ARC MAGMAS, KLAMATH MOUNTAIN PROVINCE (KMP), CA AND OR

2019 ◽  
Author(s):  
Calvin G. Barnes ◽  
◽  
Rachel Hudson ◽  
Kevin Werts ◽  
Aaron S. Yoshinobu
Keyword(s):  
Arc Magmas ◽  
Mountain Province ◽  
Klamath Mountain

Provenance of basaltic tephra from Vatnajökull subglacial volcanoes, Iceland, as determined by major- and trace-element analyses

The Holocene ◽  
2011 ◽  
Vol 21 (7) ◽  
pp. 1037-1048 ◽  
Author(s):  
Bergrún Arna Óladóttir ◽  
Olgeir Sigmarsson ◽  
Gudrún Larsen ◽  
Jean-Luc Devidal
Keyword(s):  
Trace Element ◽  
Inductively Coupled Plasma ◽  
Major Element ◽  
Element Composition ◽  
Major Element Composition ◽  
Volcanic System ◽  
The Holocene ◽  
Inductively Coupled ◽  
Ice Cap ◽  
The North

The Holocene eruption history of subglacial volcanoes in Iceland is largely recorded by their tephra deposits. The numerous basaltic tephra offer the possibility to make the tephrochronology in the North Atlantic area more detailed and, therefore, more useful as a tool not only in volcanology but also in environmental and archaeological studies. The source of a tephra is established by mapping its distribution or inferred via compositional fingerprinting, mainly based on major-element analyses. In order to improve the provenance determinations for basaltic tephra produced at Grímsvötn, Bárdarbunga and Kverkfjöll volcanic systems in Iceland, 921 samples from soil profiles around the Vatnajökull ice-cap were analysed for major-element concentrations by electron probe microanalysis. These samples are shown to represent 747 primary tephra units. The tephra erupted within each of these volcanic system has similar chemical characteristics. The major-element results fall into three distinctive compositional groups, all of which show regular decrease of MgO with increasing K2O concentrations. The new analyses presented here considerably improve the compositional distinction between products of the three volcanic systems. Nevertheless, slight overlap of the compositional groups for each system still remains. In situ trace-element analyses by laser-ablation-inductively-coupled-plasma-mass-spectrometry were applied for better provenance identification for those tephra having similar major-element composition. Three trace-element ratios, Rb/Y, La/Yb and Sr/Th, proved particularly useful. Significantly higher La/Yb distinguishes the Grímsvötn basalts from those of Bárdarbunga and Rb/Y values differentiate the basalts of Grímsvötn and Kverkfjöll. Additionally, the products of Bárdarbunga, Grímsvötn and Kverkfjöll form distinct compositional fields on a Sr/Th versus Th plot. Taken together, the combined use of major- and trace-element analyses in delineating the provenance of basaltic tephra having similar major-element composition significantly improves the Holocene tephra record as well as the potential for correlations with tephra from outside Iceland.

Major Element, Trace Element, Nutrient, and Radionuclide Mobility in a Mining By-Product-Amended Soil

2012 ◽  
Vol 41 (6) ◽  
pp. 1818-1834 ◽  
Author(s):  
G. Douglas ◽  
J. Adeney ◽  
K. Johnston ◽  
L. Wendling ◽  
S. Coleman
Keyword(s):  
Trace Element ◽  
Major Element ◽  
Amended Soil
Sign in / Sign up

Export Citation Format

Share Document