scholarly journals Supplemental Material: Latest Permian–Triassic magmatism of the Taimyr Peninsula: New evidence for a connection to the Siberian Traps large igneous province

2021 ◽  
Author(s):  
Mikhail Kurapov ◽  
et al.
Keyword(s):  
Trace Element ◽  
Analytical Data ◽  
Weighted Average ◽  
Large Igneous Province ◽  
Taimyr Peninsula ◽  
Isotopic Data ◽  
Siberian Traps ◽  
Igneous Province ◽  
New Evidence

<div>Table S1: Results for the SIMS SHRIMP and LA–ICPMS U-Pb zircon analysis. Table S2: Ar–Ar analytical data for studied samples. Table S3: Rb–Sr, Sm-Nd isotopic data of studied samples. Table S4: Major and trace element analyses of studied samples with the coordinates of studied samples (WGS84 projection). Figure S1: BSE–CL images of zircon grains from the studied granites. Figure S2: Concordia and weighted average diagrams for studied granites. Figure S3: Ar–Ar spectra on biotite and amphibole for studied latest Permian–Triassic granites.<br></div>

Ultramafic-alkaline-carbonatite complexes as a result of two-stage melting of mantle plume: evidence from the mid-paleoproterozoic Tiksheozero intrusion, Northern Karelia, Russia

2019 ◽  
Vol 486 (4) ◽  
pp. 460-465
Author(s):  
E. V. Sharkov ◽  
A. V. Chistyakov ◽  
M. M. Bogina ◽  
O. A. Bogatikov ◽  
V. V. Shchiptsov ◽  
...  
Keyword(s):  
Fractional Crystallization ◽  
Mantle Plume ◽  
Large Igneous Province ◽  
Intrusive Complex ◽  
Incongruent Melting ◽  
Isotopic Data ◽  
Two Stage ◽  
Similar Composition ◽  
Igneous Province ◽  
Alkaline Magmas

Tiksheozero ultramafic-alkaline-carbonatite intrusive complex, like numerous carbonatite-bearing complexes of similar composition, is a part of large igneous province, related to the ascent of thermochemical mantle plume. Our geochemical and isotopic data evidence that ultramafites and alkaline rocks are joined by fractional crystallization, whereas carbonatitic magmas has independent origin. We suggest that origin of parental magmas of the Tiksheozero complex, as well as other ultramafic-alkaline-carbonatite complexes, was provided by two-stage melting of the mantle-plume head: 1) adiabatic melting of its inner part, which produced moderately-alkaline picrites, which fractional crystallization led to appearance of alkaline magmas, and 2) incongruent melting of the upper cooled margin of the plume head under the influence of CO2-rich fluids  that arrived from underlying zone of adiabatic melting gave rise to carbonatite magmas.

Volatile concentrations in olivine-hosted melt inclusions from meimechite and melanephelinite lavas of the Siberian Traps Large Igneous Province: Evidence for flux-related high-Ti, high-Mg magmatism

2018 ◽  
Vol 483 ◽  
pp. 442-462 ◽  
Author(s):  
Alexei V. Ivanov ◽  
Samuel B. Mukasa ◽  
Vadim S. Kamenetsky ◽  
Michael Ackerson ◽  
Elena I. Demonterova ◽  
...  
Keyword(s):  
Melt Inclusions ◽  
Large Igneous Province ◽  
Siberian Traps ◽  
Igneous Province

scholarly journals Toxic mercury pulses into late Permian terrestrial and marine environments

Geology ◽  
2020 ◽  
Vol 48 (8) ◽  
pp. 830-833 ◽  
Author(s):  
Stephen E. Grasby ◽  
Xiaojun Liu ◽  
Runsheng Yin ◽  
Richard E. Ernst ◽  
Zhuoheng Chen
Keyword(s):  
Trophic Levels ◽  
Large Igneous Province ◽  
Late Permian ◽  
Volcanic Emissions ◽  
Loading Rates ◽  
Siberian Traps ◽  
Igneous Province ◽  
Permian Extinction ◽  
Potential Impact ◽  
Normal Background

Abstract Large spikes in mercury (Hg) concentration are observed globally at the latest Permian extinction (LPE) horizon that are thought to be related to enhanced volcanic emissions of the Siberian Traps large igneous province (LIP). While forming an effective chemostratigraphic marker, it remains unclear whether such enhanced volcanic Hg emissions could have generated toxic conditions that contributed to extinction processes. To address this, we examined the nature of enhanced Hg emissions from the Siberian Traps LIP and the potential impact it may have had on global ecosystems during the LPE. Model results for a LIP eruption predict that pulses of Hg emissions to the atmosphere would have been orders of magnitude greater than normal background conditions. When deposited into world environments, this would have generated a series of toxic shocks, each lasting &gt;1000 yr. Such repeated Hg loading events would have had severe impact across marine trophic levels, as well as been toxic to terrestrial plant and animal life. Such high Hg loading rates may help explain the co-occurrence of marine and terrestrial extinctions.

Global temperature response to century-scale degassing from the Siberian Traps Large igneous province

2017 ◽  
Vol 471 ◽  
pp. 96-107 ◽  
Author(s):  
Frode Stordal ◽  
Henrik H. Svensen ◽  
Ingrid Aarnes ◽  
Marco Roscher
Keyword(s):  
Temperature Response ◽  
Global Temperature ◽  
Large Igneous Province ◽  
Siberian Traps ◽  
Igneous Province

scholarly journals Late Permian High-Ti Basalt in Western Guangxi, SW China and Its Link With the Emeishan Large Igneous Province: Geochronological and Geochemical Perspectives

2021 ◽  
Vol 9 ◽  
Author(s):  
Chenguang Zhang ◽  
Renyu Zeng ◽  
Changming Li ◽  
Jian Jiang ◽  
Tianguo Wang ◽  
...  
Keyword(s):  
Weighted Average ◽  
Large Igneous Province ◽  
Late Permian ◽  
Flood Basalts ◽  
Sw China ◽  
Continental Flood Basalts ◽  
Emeishan Large Igneous Province ◽  
Igneous Province ◽  
The Difference ◽  
Emeishan Lip

High-Ti (Ti/Y) flood basalts are widely distributed in the Late Permian Emeishan large igneous province (LIP), SW China, and their spatial distribution and genetic mechanism are important to reveal the role of plume-lithosphere interactions in the LIP origin. Western Guangxi is located on the eastern edge of Emeishan LIP. To explore the genesis of the high-Ti basalt in western Guangxi and any genetic link with the Emeishan LIP, we performed whole-rock geochemical and Sr-Nd isotope and zircon U-Pb-Hf isotope analyses on the Longlin basalts from western Guangxi. The results indicate that the Longlin basalt from Tongdeng area has relatively high SiO2 but low MgO and TFe2O3 contents. The rocks have zircon εHf(t) = −0.42 to 6.41, whole-rock (87Sr/86Sr)i = 0.707167–0.707345, and εNd(t) = −2.5 to −2.14. In contrast, the Longlin basalt from Zhoudong area has relatively low SiO2 but high MgO and TFe2O3 contents. The rocks have whole-rock (87Sr/86Sr)i = 0.706181–0.706191 and εNd(t) = −0.57 to 0.69. Four Longlin basalt samples display LREE enrichments and HREE depletions, and with indistinct δEu and δCe anomalies. LA-ICP-MS zircon U-Pb dating on three Longlin basalt samples (from different localities) yielded consistent weighted average age of 257.9 ± 2.6 Ma (MSWD = 0.55), 259.5 ± 0.75 Ma (MSWD = 3.0), and 256.7 ± 2.0 Ma (MSWD = 0.68), indicating a Late Permian emplacement. Considering the similar age and geochemical features between the Longlin basalt and Emeishan flood basalts, we interpret that the former is spatially, and temporally associated with the Emeishan LIP. Geochemical features show that the high-Ti basalts in western Guangxi resemble Deccan-type continental flood basalts (CFBs), which were derived by decompression melting of the mantle plume. Combined with previous geochemical studies, we suggest that the difference in Ti content and Ti/Y ratio in CFBs are related to the depth and melting degree of mantle source, in which high-Ti features may have been linked to low degree of partial melting in the deep mantle.

Spatial variability in Karoo dolerites

2021 ◽  
Author(s):  
Arnold Kotze ◽  
R. James Roberts
Keyword(s):  
South Africa ◽  
Trace Element ◽  
Basaltic Magma ◽  
Principal Component ◽  
Large Igneous Province ◽  
Appreciable Amount ◽  
Data Set ◽  
Igneous Province ◽  
Positive Loading ◽  
Project Data

&lt;p&gt;AD Kotze and RJ Roberts&lt;/p&gt;&lt;p&gt;Department of Geology, University of Pretoria, Hatfield, Pretoria, South Africa; [email protected]&lt;/p&gt;&lt;p&gt;The Karoo Large Igneous Province (KLIP) in South Africa consists of both a spatially limited extrusive basalt suite (Drakensberg Group) and a spatially extensive dolerite suite, both generally considered to be remarkable homogenous and of a &amp;#8220;low-Ti&amp;#8221; character (Luttinen, 2018). The homogeneity of the rocks requires that statistical analysis is necessary to look for spatial and geochemical trends in the data, which may yield clues to the mantle processes producing the 60 000 km&lt;sup&gt;2&lt;/sup&gt; expanse of basaltic magma. In this project, data derived from several locations are used as proxies to check for lateral variability in the Karoo dolerites. A principal component analysis (PCA) on trace element data using a covariance matrix was performed, and comparisons based on variables that are 1) common to the Karoo dolerites and Lesotho basalts and, 2) responsible for the most amount of variation to the data set are made. Trace element modelling is then used to test different mantle melting scenarios possibly responsible for the variation seen in the dolerites.&lt;/p&gt;&lt;p&gt;Principal component analyses revealed several trace elements are responsible for most of the variability in the dolerites. Cr and Ni has the strongest positive loading on Component 1 whereas Cr and Ba has the strongest positive loading on Component 2. Ba has a strong negative loading on Component 1. Cu, Sr, V and Zr do impart an appreciable amount of variation to the data, but all four variables have weak negative loadings on both components. Interestingly, the activity of Cu and V seems to be the inverse of that of Cr and Ni.&lt;/p&gt;&lt;p&gt;Due to the nature of a PCA, this work is afforded an opportunity to place the geochemistry of the Karoo dolerites within a larger geodynamic context without bias. From the observed variation, the activity of Ba and Cr is interpreted as an assimilation-oxidation process, whereas the Ni signature reflects the mantle origin of the magmas. Further modelling of these processes will allow the testing of suggested mechanisms for the formation of the KLIP, especially whether the magmatism is plume-related or related to the foundering of crustal blocks.&lt;/p&gt;&lt;p&gt;Luttinen, A., 2018. Bilateral geochemical asymmetry in the Karoo large igneous province. Scientific Reports, 8(5223).&lt;/p&gt;

scholarly journals Longevity of the Permian Emeishan mantle plume (SW China): 1 Ma, 8 Ma or 18 Ma?

2008 ◽  
Vol 145 (3) ◽  
pp. 373-388 ◽  
Author(s):  
J. GREGORY SHELLNUTT ◽  
MEI-FU ZHOU ◽  
DAN-PING YAN ◽  
YANBIN WANG
Keyword(s):  
Trace Element ◽  
Flood Basalt ◽  
Large Igneous Province ◽  
Flood Basalts ◽  
Geological Evidence ◽  
Ocean Island Basalts ◽  
Igneous Province ◽  
Emeishan Mantle Plume ◽  
Decompressional Melting ◽  
Shrimp Zircon

AbstractAfter the formation of the ~ 260 Ma Emeishan large igneous province, there were two volumetrically minor magmatic pulses at ~ 252 Ma and ~ 242 Ma, respectively. Alkaline mafic dykes intruding both 260 Ma and 252 Ma felsic plutons in the Panxi region, southwestern China, have compositions similar to the Emeishan flood basalts. One dyke is dated using the SHRIMP zircon U–Pb technique at 242 ± 2 Ma, ~ 18 Ma younger than the start of Emeishan magmatism. The dykes have enriched light rare earth element patterns (La/YbN = 4.4–18.8) and trace element patterns similar to the Emeishan flood basalts and average ocean-island basalts. Some trace element ratios of the dykes (Zr/Nb = 3.8–8.2, La/Nb = 0.4–1.7, Ba/La = 7.5–25.6) are somewhat similar to EM1 source material, however, there are differences. Their εNd values (εNd = +2.6 and +2.7) andISr (ISr = 0.704542 and 0.704554) ratios are indicative of a mantle source. Thus Emeishan magmatism may have lasted for almost 20 Ma after the initial eruption. However, geological evidence precludes the possibility that the post-260 Ma magmatic events were directly related to Emeishan magmatism, which began at and ended shortly after 260 Ma. The 252 Ma plutons and 242 Ma dykes represent volumetrically minor melting of the fossil Emeishan plume-head beneath the Yangtze crust. The 252 Ma magmatic event was likely caused by post-flood basalt extension of the Yangtze crust, whereas the 242 Ma event was caused by decompressional melting associated with the collision between the South China and North China blocks during the Middle Triassic.

scholarly journals Simultaneous Quantification of Forsterite Content and Minor–Trace Elements in Olivine by LA–ICP–MS and Geological Applications in Emeishan Large Igneous Province

Minerals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 634
Author(s):  
Shitou Wu ◽  
Yadong Wu ◽  
Yueheng Yang ◽  
Hao Wang ◽  
Chao Huang ◽  
...  
Keyword(s):  
Trace Elements ◽  
Trace Element ◽  
Inductively Coupled Plasma ◽  
Large Igneous Province ◽  
Emeishan Large Igneous Province ◽  
Inductively Coupled ◽  
Minor Elements ◽  
Icp Ms ◽  
Igneous Province ◽  
Peridotitic Mantle

Olivine forsterite contents [Fo = 100 × Mg/(Mg + Fe) in mol%] and minor–trace element concentrations can aid our understanding of the Earth’s mantle. Traditionally, these data are obtained by electron probe microanalysis for Fo contents and minor elements, and then by laser ablation–inductively coupled plasma–mass spectrometry (LA–ICP–MS) for trace elements. In this study, we demonstrate that LA–ICP–MS, with a simplified 100% quantification approach, allows the calculation of Fo contents simultaneously with minor–trace elements. The approach proceeds as follows: (1) calculation of Fo contents from measured Fe/Mg ratios; (2) according to the olivine stoichiometric formula [(Mg, Fe)2SiO4] and known Fo contents, contents of Mg, Fe and Si can be computed, which are used as internal standards for minor–trace element quantification. The Fo content of the MongOLSh 11-2 olivine reference material is 89.55 ± 0.15 (2 s; N = 120), which agrees with the recommended values of 89.53 ± 0.05 (2 s). For minor–trace elements, the results matched well with the recommended values, apart from P and Zn data. This technique was applied to olivine phenocrysts in the Lijiang picrites from the Emeishan large igneous province. The olivine compositions suggest that the Lijiang picrites have a peridotitic mantle source.

Siberian Traps large igneous province: Evidence for two flood basalt pulses around the Permo-Triassic boundary and in the Middle Triassic, and contemporaneous granitic magmatism

2013 ◽  
Vol 122 ◽  
pp. 58-76 ◽  
Author(s):  
Alexei V. Ivanov ◽  
Huayiu He ◽  
Liekun Yan ◽  
Viktor V. Ryabov ◽  
Artem Y. Shevko ◽  
...  
Keyword(s):  
Middle Triassic ◽  
Flood Basalt ◽  
Large Igneous Province ◽  
Triassic Boundary ◽  
Siberian Traps ◽  
Granitic Magmatism ◽  
Igneous Province
Sign in / Sign up

Export Citation Format

Share Document