Tourmaline as a recorder of magmatic–hydrothermal evolution: an in situ major and trace element analysis of tourmaline from the Qitianling batholith, South China

2015 ◽  
Vol 170 (5-6) ◽  
Author(s):  
Shui-Yuan Yang ◽  
Shao-Yong Jiang ◽  
Kui-Dong Zhao ◽  
Bao-Zhang Dai ◽  
Tao Yang
Keyword(s):  
Trace Element ◽  
South China ◽  
Trace Element Analysis ◽  
Element Analysis

In situ LA-ICP-MS U–Pb geochronology and trace element analysis of hydrothermal titanite from the giant Zhuxi W (Cu) skarn deposit, South China

2018 ◽  
Vol 54 (4) ◽  
pp. 569-590 ◽  
Author(s):  
Shiwei Song ◽  
Jingwen Mao ◽  
Guiqing Xie ◽  
Lei Chen ◽  
M. Santosh ◽  
...  
Keyword(s):  
Trace Element ◽  
South China ◽  
Trace Element Analysis ◽  
Skarn Deposit ◽  
Element Analysis ◽  
Icp Ms

DEVELOPMENT OF CALCITE REFERENCE MATERIALS FOR IN-SITU U-PB DATING AND TRACE-ELEMENT ANALYSIS

2016 ◽  
Author(s):  
Robert M. Holder ◽  
◽  
Bradley R. Hacker ◽  
Andrew R.C. Kylander-Clark
Keyword(s):  
Trace Element ◽  
Reference Materials ◽  
Trace Element Analysis ◽  
Element Analysis

scholarly journals Parental magma composition of the Main Zone of the Bushveld Complex: Evidence from in-situ LA-ICP-MS trace element analysis of silicate minerals in the cumulate rocks

2020 ◽  
Author(s):  
Shenghong Yang ◽  
Wolfgang D. Maier ◽  
Belinda Godel ◽  
Sarah-Jane Barnes ◽  
Eero Hanski ◽  
...  
Keyword(s):  
Trace Elements ◽  
Trace Element ◽  
Bushveld Complex ◽  
Trace Element Analysis ◽  
Parental Magma ◽  
Main Zone ◽  
Element Analysis ◽  
Silicate Minerals ◽  
Incompatible Elements

<p>In-situ trace element analysis of cumulus minerals may provide a clue to the parental magma from which the minerals crystallized. However, this is hampered by effects of the trapped liquid shift (TLS). In the Main Zone (MZ) of the Bushveld Complex, the Ti content in plagioclase grains shows a clear increase from core to rim, whereas most other elements (e.g., rare earth elements (REEs), Zr, Hf, Pb) do not. This is different from the prominent intra-grain variation of all trace elements in silicate minerals in mafic dikes and smaller intrusion, which have a faster cooling rate. We suggest that crystal fractionation of trapped liquid occurred in the MZ of Bushveld and the TLS may have modified the original composition of the cumulus minerals for most trace elements except Ti during slow cooling. Quantitative model calculations suggest that the influence of the TLS depends on the bulk partition coefficient of the element. The effect on highly incompatible elements is clearly more prominent ­­than on moderately incompatible and compatible elements because of different concentration gradients between cores and rims of cumulate minerals. This is supported by the following observations in the MZ of Bushveld: 1) positive correlation between Cr, Ni and Mg# of clinopyroxene and orthopyroxene, 2) negative correlation between moderately incompatible elements (e.g., Mn and Sc in clinopyroxene and orthopyroxene, Sr, Ba, Eu in plagioclase), but 3) poor correlation between highly incompatible elements and Mg# of clinopyroxene and orthopyroxene or An# of plagioclase. Modeling suggests that the extent of the TLS for a trace element is also dependent on the initial fraction of the primary trapped liquid, with strong TLS occurring if the primary trapped liquid fraction is high. This is supported by the positive correlation between highly incompatible trace element abundances in cumulus minerals and whole-rock Zr contents.</p><p>We have calculated the composition of the parental magma of the MZ of the Bushveld Complex. The compatible and moderately incompatible element contents of the calculated parental liquid are generally similar to those of the B3 marginal rocks, but different from the B1 and B2 marginal rocks. For the highly incompatible elements, we suggest that the use of the sample with the lowest whole-rock Zr content and the least degree of TLS is the best approach to obtain the parental magma composition. Based on calculation, we propose that a B3 type liquid is the most likely parental magma to the MZ of the Bushveld Complex.</p>

scholarly journals Unraveling the histories of Proterozoic shales through in situ Rb-Sr dating and trace element laser ablation analysis

Geology ◽  
2021 ◽  
Author(s):  
Darwinaji Subarkah ◽  
Morgan L. Blades ◽  
Alan S. Collins ◽  
Juraj Farkaš ◽  
Sarah Gilbert ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Trace Element ◽  
Inductively Coupled Plasma ◽  
Trace Element Analysis ◽  
Reaction Cell ◽  
Element Analysis ◽  
Deep Time ◽  
Novel Approach ◽  
Depositional Age

Authigenic components in marine sediments are important archives for past environment reconstructions. However, defining reliable age constraints and assessing the effects of post-depositional overprints in Precambrian sequences are challenging. We demonstrate a new laser-based analytical approach that has the potential to rapidly and accurately evaluate the depositional and alteration histories of Proterozoic shales. Our study employs a novel application of in situ Rb-Sr dating coupled with simultaneous trace-element analysis using reaction-cell laser ablation–inductively coupled plasma–tandem mass spectrometry (LA-ICPMS/MS). We present results from shales sourced from two wells in the Proterozoic McArthur Basin, northern Australia. These rocks have been widely used by previous studies as a key section for ancient biogeochemical and paleo-redox reconstructions. Shales from well UR5 yielded initial 87Sr/86Sr ratios, Rb-Sr ages, and rare earth element plus yttrium (REEY) patterns similar to those of a dolerite sampled from the same core. We propose that the UR5 samples chronicle hydrothermal alteration instigated by the dolerite intrusion. In contrast, a correlative shale from well UR6 yielded an age consistent with the expected depositional age (1577 ± 56 Ma) with REEY and initial 87Sr/86Sr ratios similar to ca. 1.5 Ga seawater. We suggest that this sample records the minimum depositional age and early marine diagenetic history for this unit. This new technique can date Proterozoic shales quickly, cheaply, and with minimum sample preparation. Importantly, ages are triaged to differentiate between those recording primary marine versus secondary processes. This novel approach provides a potentially powerful tool for dating and fingerprinting the vast array of ancient marine shales for further studies of Earth systems through deep time.

In situ major and trace element analysis of magnetite from carbonatite-related complexes: Implications for petrogenesis and ore genesis

2019 ◽  
Vol 107 ◽  
pp. 30-40 ◽  
Author(s):  
Wei Chen ◽  
Yuan-Can Ying ◽  
Tian Bai ◽  
Jin-Jun Zhang ◽  
Shao-Yong Jiang ◽  
...  
Keyword(s):  
Trace Element ◽  
Trace Element Analysis ◽  
Ore Genesis ◽  
Element Analysis
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