scholarly journals Supplemental Material: Integrating zircon trace-element geochemistry and high-precision U-Pb zircon geochronology to resolve the timing and petrogenesis of the late Ediacaran–Cambrian Wichita igneous province, Southern Oklahoma Aulacogen, USA

2020 ◽  
Author(s):  
Corey Wall ◽  
et al.
Keyword(s):  
Trace Element ◽  
High Precision ◽  
Analytical Methods ◽  
Trace Element Geochemistry ◽  
Zircon Geochronology ◽  
Element Geochemistry ◽  
Geological Setting ◽  
Igneous Province ◽  
Southern Oklahoma ◽  
Data Tables

Section S1 (geological setting of Arbuckle rhyolite samples), Section S2 (analytical methods), Section S3 (CL images), Section S4 (data tables), and Section S5 (Concordia diagrams).

Integrating zircon trace-element geochemistry and high-precision U-Pb zircon geochronology to resolve the timing and petrogenesis of the late Ediacaran–Cambrian Wichita igneous province, Southern Oklahoma Aulacogen, USA

Geology ◽  
2020 ◽  
Author(s):  
Corey J. Wall ◽  
Richard E. Hanson ◽  
Mark Schmitz ◽  
Jonathan D. Price ◽  
R. Nowell Donovan ◽  
...  
Keyword(s):  
Trace Element ◽  
High Precision ◽  
Time Frame ◽  
Spreading Center ◽  
Trace Element Geochemistry ◽  
Weighted Mean ◽  
Element Geochemistry ◽  
Igneous Province ◽  
Southern Oklahoma ◽  
Laurentian Margin

The bimodal Wichita igneous province (WIP) represents the only exposed Ediacaran to Cambrian anorogenic magmatic assemblage present along the buried southern margin of Laurentia and was emplaced during rifting in the Southern Oklahoma Aulacogen prior to Cambrian opening of the southern Iapetus Ocean. Here, we establish the first high-precision U-Pb zircon geochronological framework for the province. Weighted mean 206Pb/238U dates from mafic and felsic rocks in the Wichita Mountains indicate emplacement in a narrow time frame from 532.49 ± 0.12 Ma to 530.23 ± 0.14 Ma. Rhyolite lavas in the Arbuckle Mountains farther east yield weighted mean 206Pb/238U dates of 539.20 ± 0.15 Ma and 539.46 ± 0.13 Ma. These dates for the WIP indicate that magmatism in the Southern Oklahoma Aulacogen postdated the ca. 540 Ma rift-drift transition along the Appalachian margin to the east. Wholerock trace-element and isotopic geochemistry, supplemented by trace elements in zircon, tracks the evolution of magma sources during WIP petrogenesis. These data indicate that initial melting and assimilation of subcontinental mantle lithosphere by an uprising mantle plume were followed by increasing involvement of asthenospheric melts with time. We suggest that upwelling of this plume in the area of the Southern Oklahoma Aulacogen triggered an inboard jump of the spreading center active along the eastern margin of Laurentia, which led to separation of the Precordillera terrane (now located in Argentina) from the Ouachita embayment present in the southern Laurentian margin.

scholarly journals Supplemental Material: Postcaldera intrusive magmatism at the Platoro caldera complex, Southern Rocky Mountain volcanic field, Colorado, USA

2021 ◽  
Author(s):  
A.K. Gilmer ◽  
et al.
Keyword(s):  
Trace Element ◽  
Rocky Mountain ◽  
Volcanic Field ◽  
Trace Element Geochemistry ◽  
Zircon Geochronology ◽  
Element Geochemistry ◽  
Isotopic Compositions ◽  
Southern Rocky Mountain

<div>Table S1: Whole-rock compositions of analyzed samples. Table S2: Major and trace element geochemistry of feldspar. Table S3: Major and trace element geochemistry of pyroxene. Table S4: Major and trace element geochemistry of biotite. Table S5: Major and trace element geochemistry of amphibole. Table S6: Zircon geochronology and trace element geochemistry. Table S7: Lutetium and hafnium isotopic compositions of zircon. Table S8: Amphibole-plagioclase thermometry. Table S9: Sample locations and lithologies.<br></div>

scholarly journals Rare sapphire-bearing syenitoid pegmatites and associated granitoids of the Hamedan region, Sanandaj–Sirjan zone, Iran: analysis of petrology, lithogeochemistry and zircon geochronology / trace element geochemistry

2020 ◽  
Vol 157 (9) ◽  
pp. 1499-1525 ◽  
Author(s):  
Ali A Sepahi ◽  
Hamed Vahidpour ◽  
David R Lentz ◽  
Chris RM McFarlane ◽  
Mohammad Maanijou ◽  
...  
Keyword(s):  
Trace Element ◽  
Trace Element Geochemistry ◽  
Chemical Compositions ◽  
Zircon Geochronology ◽  
Element Geochemistry ◽  
High K ◽  
Igneous Origin ◽  
Plutonic Complex ◽  
Sanandaj Sirjan Zone ◽  
Zircon Thermometry

AbstractPegmatites and associated granitoids are integral parts of the Alvand plutonic complex in the Sanandaj–Sirjan zone, Iran. Whole rock major- and trace-element lithogeochemistry together with zircon U–Pb geochronology and zircon geochemistry are examined to evaluate the petrogenesis of sapphire-bearing pegmatites and other peraluminous pegmatites in the region. Pegmatites vary in their chemical compositions from mostly peraluminous, high-K calc-alkaline to shoshonitic signatures. A rare variety of extremely peraluminous sapphire-bearing syenitoid pegmatite (Al2O3 > 30 wt %; A/CNK > 2) exists. This silica-undersaturated pegmatite and its sapphire crystals have a primary igneous origin. U–Pb zircon geochronology of three separate samples from this pegmatite indicates the following ages: 168 ± 1 Ma, 166 ± 1 Ma and 164 ± 1 Ma. The zircon grains have notable amounts of Hf (up to 17 200 ppm), U (up to 13 580 ppm), Th (up to 5148 ppm), Y (up to 4764 ppm) and ∑REE (up to 2534 ppm). There is a positive correlation between Hf and Th, Nb and Ta, U and Th, and Y and HREE and a negative correlation between Hf and Y values in the zircons. These zircons exhibit pronounced positive Ce anomalies (Ce/Ce* = 1.15–68.06) and negative Eu anomalies (Eu/Eu* = 0.001–0.56), indicative of the relatively oxidized conditions of the parent magma. Ti-in-zircon thermometry reveals temperatures from as low as ~683 °C up to ~828 °C (average = 755° ± 73 °C). Zircon and monazite saturation equilibria are also consistent with these temperatures. Zircon grains are magmatic (average La < 1.5, (Sm/La)N > 100 and Th/U > 0.7), with chemical characteristics similar to zircons from continental crust.

scholarly journals Magma Evolution Leading to Porphyry Au-Cu Mineralization at the Ok Tedi Deposit, Papua New Guinea: Trace Element Geochemistry and High-Precision Geochronology of Igneous Zircon

2018 ◽  
Vol 113 (1) ◽  
pp. 39-61 ◽  
Author(s):  
Simon J.E. Large ◽  
Albrecht von Quadt ◽  
Jörn-Frederik Wotzlaw ◽  
Marcel Guillong ◽  
Christoph A. Heinrich
Keyword(s):  
Trace Element ◽  
Papua New Guinea ◽  
High Precision ◽  
New Guinea ◽  
Trace Element Geochemistry ◽  
Element Geochemistry ◽  
Magma Evolution ◽  
Igneous Zircon

scholarly journals The Uitkomst intrusion and Nkomati Ni-Cu-Cr-PGE deposit, South Africa: trace element geochemistry, Nd isotopes and high-precision geochronology

2017 ◽  
Vol 53 (1) ◽  
pp. 67-88 ◽  
Author(s):  
W.D. Maier ◽  
S.A. Prevec ◽  
J.S. Scoates ◽  
C.J. Wall ◽  
S.-J. Barnes ◽  
...  
Keyword(s):  
South Africa ◽  
Trace Element ◽  
High Precision ◽  
Trace Element Geochemistry ◽  
Nd Isotopes ◽  
Element Geochemistry
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