Major and trace element, and Sr isotope compositions of clinopyroxene phenocrysts in mafic dykes on Jiaodong Peninsula, southeastern North China Craton: Insights into magma mixing and source metasomatism

Liang, Yayun; Deng, Jun; Liu, Xuefei; Wang, Qingfei; Qin, Cheng; Li, Yan; Yi, Yang; Zhou, Mian; Jiang, Jieyan

doi:10.1016/j.lithos.2018.01.031

Cited by 45 publications

(10 citation statements)

References 92 publications

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“…The Avaj data plot within 2σ uncertainty of predicted mineral components (Fig. 8c-f; Putirka 1999; Mollo et al 2013;Liang et al 2018) and have diopside-hedenbergite (ΔDiHd) components close to zero (Supplementary Table 2), reflecting near-equilibrium crystallization. Second, we calculate the Fe-Mg partition coefficient [Kd Fe-Mg = (Fe cpx ∕ Fe melt ) × (Mg melt ∕ Mg cpx )] following Putika (2008).…”

Section: Clinopyroxene -Melt Equilibriummentioning

confidence: 64%

The Oligocene Avaj volcanic – plutonic complex of Central Iran: A record of magma evolution and mineral equilibria

Babazadeh

Ghalamghash

Furman

et al. 2021

Journal of Asian Earth Sciences

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Section: Clinopyroxene -Melt Equilibriummentioning

confidence: 64%

The Oligocene Avaj volcanic – plutonic complex of Central Iran: A record of magma evolution and mineral equilibria

Babazadeh

Ghalamghash

Furman

et al. 2021

Journal of Asian Earth Sciences

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“…Details of analytical methods for zircon U‐Pb and Lu‐Hf isotope analysis, whole‐rock major and trace element and Sr‐Nd isotope analysis, and in situ major and trace element analysis of amphibole can be found in the supporting information (Li et al, ; Liang et al, ; Liu et al, , ; Wang et al, ).…”

Section: Analytical Methods and Resultsmentioning

confidence: 99%

Initial Rifting of the Lhasa Terrane from Gondwana: Insights From the Permian (~262 Ma) Amphibole‐Rich Lithospheric Mantle‐Derived Yawa Basanitic Intrusions in Southern Tibet

Zeng

Ducea

et al. 2019

JGR Solid Earth

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The Permian tectonic setting of the Lhasa Terrane in southern Tibet remains controversial (i.e., continental rift vs. subduction‐collision) and is crucial to palinspastic reconstructions of the eastern Tethys during the breakup of Gondwana. In this study, we present new geochronological, geochemical, and mineralogical data for the Permian (~262 Ma) Yawa intrusions in the southern Lhasa Terrane. These rocks are silica‐undersaturated and alkaline, with high TiO2 and moderate MgO, and exhibit enrichments in Th, light rare earth elements, and Nb‐Ta, and depletions in K. These chemical compositions, combined with uniform whole‐rock (87Sr/86Sr)i (0.7039–0.7044), εNd(t) (1.85–2.81), and εHf(t) (4.21–6.90) values, and zircon εHf(t) (4.53–9.97) and δ18O (5.04‰–5.76‰) values, indicate the magmas were derived by partial melting of amphibole‐rich lithospheric mantle. The magmas subsequently underwent fractionation of clinopyroxene, amphibole, and Fe‐Ti oxides. The amphibole in the lithospheric mantle likely formed as cumulates from low‐degree asthenospheric melts during incipient extension. Given that the amphibole‐rich metasomatic veins have a lower melting temperature than the surrounding peridotite, they were susceptible to melting during the early stages of thermal perturbation of the mantle. Because there is no evidence of Permian continental subsidence in the Lhasa Terrane, we suggest the Yawa intrusions were formed at the onset of lithospheric extension associated with initial rifting of the Lhasa Terrane from the Indian Plate during Gondwana breakup, which was a precursor to the opening of the Neo‐Tethys Ocean.

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“…Reverse zoning and resorption textures are common in pyroxenes from various rocks [18,43,46], and are considered to record the open system processes, including magma mixing and contamination by host rocks [4,43]. Some of the clinopyroxenes in the variolitic lavas and a single crystal in the massive lavas exhibited reverse zoning that manifested as increasing Mg# from the core to rims, instead of Mg# decreasing (as is the case in normal zoning).…”

Section: Origin Of Clinopyroxene Zoningmentioning

confidence: 99%

“…Numerous studies of pyroxenes from geochemically diverse volcanic rocks of various geodynamic settings [2,[7][8][9][10][11][12] have demonstrated that their composition and texture are reliable indicators by which to estimate the evolution and ascent histories of magmas. This approach has been successfully applied to decipher the evolution of modern volcanic systems [13][14][15] as well as Mesozoic-Paleozoic paleovolcanic series of volcanic rocks [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Geochemistry and Texture of Clinopyroxene Phenocrysts from Paleoproterozoic Picrobasalts, Karelian Craton, Fennoscandian Shield: Records of Magma Mixing Processes

2020

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This paper presents an integrated major and trace element data and crystal size distribution analysis for zoned clinopyroxene phenocrysts hosted in variolitic and massive picrobasalts of the Suisaari Formation, Karelian Craton, Eastern Fennoscandian Shield. Clinopyroxenes in variolitic and massive lavas occur as unzoned, reverse, and normally zoned crystal. Oscillatory-zoned clinopyroxenes are only observed in variolitic lavas. The obtained data were examined in order to evaluate the contribution of magmatic processes such as magma mixing, contamination and fractional crystallization to the formation of various zoning patterns of clinopyroxene phenocrysts. Clinopyroxene phenocrysts in both variolitic and massive lavas originate from similar primary melts from a single magmatic source. The obtained data on composition and texture of clinopyroxene phenocrysts together with the crystal size distribution (CSD) analysis suggest that crystallization of the massive lavas mainly involves fractionation in a closed magmatic system, whereas the crystallization of the variolitic lavas is determined by processes in an open magmatic system. The results provide novel information on the evolution of Paleoproterozoic magmatic systems in the Karelian Craton.

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Major and trace element, and Sr isotope compositions of clinopyroxene phenocrysts in mafic dykes on Jiaodong Peninsula, southeastern North China Craton: Insights into magma mixing and source metasomatism

Cited by 45 publications

References 92 publications

The Oligocene Avaj volcanic – plutonic complex of Central Iran: A record of magma evolution and mineral equilibria

The Oligocene Avaj volcanic – plutonic complex of Central Iran: A record of magma evolution and mineral equilibria

Initial Rifting of the Lhasa Terrane from Gondwana: Insights From the Permian (~262 Ma) Amphibole‐Rich Lithospheric Mantle‐Derived Yawa Basanitic Intrusions in Southern Tibet

Geochemistry and Texture of Clinopyroxene Phenocrysts from Paleoproterozoic Picrobasalts, Karelian Craton, Fennoscandian Shield: Records of Magma Mixing Processes

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