Origin of silicic rocks of the Deccan Traps continental flood basalt province: Inferences from field observations, petrography, and geochemistry

Halder, Mahesh; Paul, Debajyoti; Yang, Shouye

doi:10.1016/j.chemer.2023.125958

Cited by 4 publications

(4 citation statements)

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“…This layout of the granophyric melts points to a direct connection between the felsic pockets within the gabbros and the small veinlets and dykes, which might be considered segregates formed due to the squeezing and extraction of a residual felsic melt during the last stages of crystallisation. The presence of similar small-volume granophyres within tholeiitic gabbros has already been described (e.g., [52][53][54]), including the CAMP magmas [11,16], and explained as the result of mafic magma evolution. Accordingly, it is likely that the granophyres formed during the last stages of the mafic magma differentiation within the MPGD intrusion.…”

Section: Origin Of the Granophyric Meltmentioning

confidence: 62%

“…U, Th and Pb isotopes were analysed on the Sensitive High-Resolution Ion Microprobe (SHRIMP II) with each analysis consisting of six scans through the relevant mass range. The primary beam, composed of 16 O 16 O + , was set to an intensity of about 5 nA, with a 120 µm Kohler aperture, which generates 17 µm × 20 µm elliptical spots on the target. All calibration procedures were performed on the standards included on the same mount.…”

Section: Methodsmentioning

confidence: 99%

“…Two accepted origins for these granophyres are based on opensystem magmatic processes, either combining crystal fractionation and variable crustal assimilation [14] or by partial melting of the crust induced by the high thermal energy of gabbroic intrusions [13]. Nevertheless, the formation of granophyres in tholeiitic magmas linked to a closed-system magmatic evolution involving extreme crystal fractionation (e.g., [16]) or melt immiscibility has also been proposed in tholeiitic bodies (e.g., [15,17,18]).…”

Section: Introductionmentioning

confidence: 99%

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Petrology and Geochemistry of Highly Differentiated Tholeiitic Magmas: Granophyres in the Messejana–Plasencia Great Dyke (Central Iberia)

Orejana,

Villaseca,

Losantos

et al. 2024

Minerals

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The Messejana–Plasencia great dyke (MPGD) is a Late Triassic tholeiitic gabbro intrusion related to the Central Atlantic Magmatic Province. Its large outcrop extent (~530 km), combined with its prolongation below the Duero basin (additional 100 km), makes it one of the world’s largest dykes known. We have studied felsic granophyric bodies appearing in its northernmost segment at different scales, from mm-sized (interstitial micrographic pockets) to felsic dykes of up to 10 m thick and 1.5 km long, intruding within the gabbros. Significant differences exist in the mineral and whole-rock composition of gabbros and granophyres, including the Sr–Nd isotopic ratios. The chemical variation in the gabbros is coherent with fractionation of olivine, clinopyroxene and plagioclase at depth. However, the presence of a compositional gap between gabbros and granophyres (absence of intermediate compositions) and the formation of these late-stage intergranular felsic melts within the gabbro mesostasis suggest that they could be derived by liquid immiscibility. The Sr–Nd isotopic heterogeneity in the MPGD gabbros and the presence of zircons with Variscan ages (~286 Ma), inherited from granulitic rocks, indicate that the mafic magmas experienced some degree of lower crust assimilation during fractionation close to the Moho depth. On the contrary, the scarce xenocrystic Variscan zircon crystals found in a granophyric dyke within the MPGD gabbro display similar textures and ages (~299 Ma) to those of the country rock granites and point to contamination at a different crustal level.

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Section: Origin Of the Granophyric Meltmentioning

confidence: 62%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Petrology and Geochemistry of Highly Differentiated Tholeiitic Magmas: Granophyres in the Messejana–Plasencia Great Dyke (Central Iberia)

Orejana,

Villaseca,

Losantos

et al. 2024

Minerals

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“…Mineral carbonization processes are an important aspect of basaltic geochemistry [63]. Through this process, CO 2 chemically reacts with minerals present in the basalt, forming carbonate minerals [64][65][66][67][68]. The rate and extent of mineral charring depends on various factors such as temperature, pressure, water availability and basalt mineral composition [69][70][71].…”

Section: Importance Of Understanding the Geochemistry Of Basalt For C...mentioning

confidence: 99%

Reactivity of Basaltic Minerals for CO2 Sequestration via In Situ Mineralization: A Review

Rasool,

Ahmad

2023

Minerals

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The underground storage of CO2 (carbon dioxide) in basalt presents an exceptionally promising solution for the effective and permanent sequestration of CO2. This is primarily attributed to its geochemistry and the remarkable presence of reactive basaltic minerals, which play a pivotal role in facilitating the process. However, a significant knowledge gap persists in the current literature regarding comprehensive investigations on the reactivity of basaltic minerals in the context of CO2 sequestration, particularly with respect to different basalt types. To address this gap, a comprehensive investigation was conducted that considered seven distinct types of basalts identified through the use of a TAS (total alkali–silica) diagram. Through a thorough review of the existing literature, seven key factors affecting the reactivity of basaltic minerals were selected, and their impact on mineral reactivity for each basalt type was examined in detail. Based on this analysis, an M.H. reactivity scale was introduced, which establishes a relationship between the reactivity of dominant and reactive minerals in basalt and their potential for carbonation, ranging from low (1) to high (5). The study will help in choosing the most suitable type of basalt for the most promising CO2 sequestration based on the percentage of reactive minerals. Additionally, this study identified gaps in the literature pertaining to enhancing the reactivity of basalt for maximizing its CO2 sequestration potential. As a result, this study serves as an important benchmark for policymakers and researchers seeking to further explore and improve CO2 sequestration in basaltic formations.

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Basaltic thermal and material inputs in rhyolite petrogenesis: the Chhapariyali rhyolite dyke, Saurashtra, Deccan Traps

et al. 2023

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Origin of silicic rocks of the Deccan Traps continental flood basalt province: Inferences from field observations, petrography, and geochemistry

Cited by 4 publications

References 50 publications

Petrology and Geochemistry of Highly Differentiated Tholeiitic Magmas: Granophyres in the Messejana–Plasencia Great Dyke (Central Iberia)

Petrology and Geochemistry of Highly Differentiated Tholeiitic Magmas: Granophyres in the Messejana–Plasencia Great Dyke (Central Iberia)

Reactivity of Basaltic Minerals for CO2 Sequestration via In Situ Mineralization: A Review

Basaltic thermal and material inputs in rhyolite petrogenesis: the Chhapariyali rhyolite dyke, Saurashtra, Deccan Traps

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