TY - JOUR
T1 - Petrogenesis of post-collisional Late Paleozoic volcanic rocks of the Bohemian Massif (Central Europe)
T2 - Isotopic variations of the lithospheric mantle related to Variscan orogeny
AU - Dostal, Jaroslav
AU - Shellnutt, J. Gregory
AU - Ulrych, Jaromir
N1 - Funding Information:
This research was supported by Natural Sciences and Engineering Research Council of Canada Discovery Grant 3782 (grant to JD), the institutional project RVO 67985831 of the Institute of Geology of the Czech Academy of Sciences (grant to JU), and Ministry of Science and Technology of Taiwan project 106-2116-M-003-007 (grant to JGS). We acknowledge Randy Corney and Jana Rajlichová for technical assistance.
Funding Information:
This research was supported by Natural Sciences and Engineering Research Council of Canada Discovery Grant 3782 (grant to JD), the institutional project RVO 67985831 of the Institute of Geology of the Czech Academy of Sciences (grant to JU), and Ministry of Science and Technology of Taiwan project 106-2116-M-003-007(grant to JGS). We acknowledge Randy Corney and Jana Rajlichov? for technical assistance. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
PY - 2020/2
Y1 - 2020/2
N2 - Post-collisional volcanic rocks associated with the Variscan orogeny are preserved in relicts of Late-Paleozoic volcano-sedimentary basins in the Bohemian Massif (central Europe). They include both the Late Carboniferous calc-alkaline and the Early Permian tholeiitic suites, which were emplaced in an extensional intracontinental setting. Both suites were derived from an enriched continental lithospheric mantle and underwent early fractionation of mafic silicate minerals. A second period of fractionation occurred within the crust. Modeling indicates that the calc-alkaline rocks fractionated at a greater depth (0.55 GPa), under oxidizing (ΔFMQ +1) and hydrous conditions whereas the tholeiitic rocks fractionated at shallow depth (0.1 GPa), under moderately oxidizing (ΔFMQ +0.7) and drier conditions. During the Variscan orogeny, the lithospheric mantle under the Bohemian Massif underwent wholesale modification, where the mantle was contaminated by subducted Precambrian sediment admixture. The Carboniferous-Permian mantle-derived rocks typically have negative ɛNd(t) and Precambrian depleted mantle model ages (TDM) compared to the equivalent Early Paleozoic rocks of the Bohemian Massif, which have positive ɛNd(t) and younger TDM. Subsequently, prior to the Cenozoic, the lithospheric mantle under the whole Bohemian Massif was rejuvenated as the Cenozoic mantle-derived rocks have positive ɛNd(t) and young TDM.
AB - Post-collisional volcanic rocks associated with the Variscan orogeny are preserved in relicts of Late-Paleozoic volcano-sedimentary basins in the Bohemian Massif (central Europe). They include both the Late Carboniferous calc-alkaline and the Early Permian tholeiitic suites, which were emplaced in an extensional intracontinental setting. Both suites were derived from an enriched continental lithospheric mantle and underwent early fractionation of mafic silicate minerals. A second period of fractionation occurred within the crust. Modeling indicates that the calc-alkaline rocks fractionated at a greater depth (0.55 GPa), under oxidizing (ΔFMQ +1) and hydrous conditions whereas the tholeiitic rocks fractionated at shallow depth (0.1 GPa), under moderately oxidizing (ΔFMQ +0.7) and drier conditions. During the Variscan orogeny, the lithospheric mantle under the Bohemian Massif underwent wholesale modification, where the mantle was contaminated by subducted Precambrian sediment admixture. The Carboniferous-Permian mantle-derived rocks typically have negative ɛNd(t) and Precambrian depleted mantle model ages (TDM) compared to the equivalent Early Paleozoic rocks of the Bohemian Massif, which have positive ɛNd(t) and younger TDM. Subsequently, prior to the Cenozoic, the lithospheric mantle under the whole Bohemian Massif was rejuvenated as the Cenozoic mantle-derived rocks have positive ɛNd(t) and young TDM.
KW - Bohemian Massif
KW - Continental lithospheric mantle
KW - Late Paleozoic basins
KW - Nd isotopes
KW - Post-collisional magmatism
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UR - https://www.mendeley.com/catalogue/c636ab44-2246-3315-b645-c984a77473bf/
U2 - 10.1016/j.lithos.2019.105331
DO - 10.1016/j.lithos.2019.105331
M3 - Article
AN - SCOPUS:85076518143
VL - 354-355
JO - Lithos
JF - Lithos
SN - 0024-4937
M1 - 105331
ER -