Geochemical and Sr–Nd–Pb isotopic constraints on the origin and petrogenesis of Paleozoic lamproites in the southern Yangtze Block, South China

Xiang, Lu; Zheng, Jianping; Zhai, Mingguo; Siebel, Wolfgang

doi:10.1007/s00410-020-1668-1

Cited by 12 publications

(10 citation statements)

References 106 publications

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“…F. Zhang et al, 2001). While the connection between mafic magmatism and lithospheric refertilization is less evident toward the center of the YC, our results (Figure 10a) indicate that refertilization/metasomatism of the SCLM extends further into the YC than previously reported based on the geochemistry of surface rocks in its northern boundary (e.g., Han et al, 2018;Xiang et al, 2020;H. F. Zhang et al, 2001, S. B. Zhang et al, 2016.…”

Section: Lab Depth and Compositional Structurecontrasting

confidence: 71%

“…A similar explanation can be advanced for the relatively fertile domain toward the northeast of the YC, where evidence for surface mafic magmatism and mantle refertilization is found toward the easternmost branch of the YC and close to the boundary with the Dabie Orogen (e.g., Xiang et al, 2020;H. F. Zhang et al, 2001).…”

Section: Lab Depth and Compositional Structurementioning

confidence: 53%

“…Interestingly, our results show a localized relative minimum in Mg# close to the Zhenyuan field (the central part of the YC; Figure 10). The lithospheric mantle beneath this field has been recently proposed to have experienced metasomatism (based on geochemical observations) by the percolation of melts associated with the ELIP (Xiang et al., 2020). However, our results also indicate that the extent of metasomatism (in major elements) in the central part of the YC has not been as widespread as previously suggested; the mantle metasomatism inferred from the composition of the lamproites in the Zhenyuan field (Xiang et al., 2020) may thus reflect a more localized event rather than a pervasive one as observed in the inner and middle zones of the ELIP.…”

Section: Discussionmentioning

confidence: 99%

“…(b) Distribution of mantle xenoliths and igneous rocks modified from X. Li et al (2015), Xiang et al (2020), T. Xu et al (2015), H. Zhang, Zheng, et al (2018), and Z. F. Zhao et al (2015). ELIP: Emeishan large igneous province.…”

Section: Phanerozoic Intraplate Magmatismmentioning

confidence: 99%

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Thermochemical State of the Upper Mantle Beneath South China From Multi‐Observable Probabilistic Inversion

Yang

Afonso

et al. 2021

JGR Solid Earth

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The South China Block (SCB) is one of the main tectonic blocks of East Asia. It is widely believed that the SCB was formed by the amalgamation of the Yangtze Craton (YC) and the Cathaysia Block (CB) during the early Neoproterozoic time (cf. G. Zhao & Cawood, 2012). The subsequent tectonic evolution of the SCB has been controlled by a number of tectonomagmatic events in the middle Paleozoic and Mesozoic associated with intracontinental reworking and/or the subduction of the Pacific plate (cf. . In particular, widespread volcanic activity occurred during the Mesozoic and Cenozoic (H. Zhang, Zheng, et al., 2018;Zhao et al., 2015). Yet, the mechanisms responsible for such extrusive activity and their effect on the overall lithospheric structure and evolution of the region remains contentious . In this context, the present-day thermochemical structure of the subcontinental lithospheric mantle (SCLM) holds important clues, not only because it controls key physical properties (e.g., mantle density and viscosity), but because any evolutionary hypothesis needs to be consistent with it.Information on the compositional and thermal structure of the SCLM can be obtained from different sources. For instance, mantle xenoliths and xenocrysts in volcanic rocks provide a direct probe (cf. Griffin et al., 2009Griffin et al., , 2004. Petrological and geochemical studies of mantle xenoliths indicate that there is a significant difference in composition between the cratonic lithosphere in the western SCB and that in the eastern SCB. Due to the absence of abundant and spatially distributed mantle samples, however, the composition and evolution of the SCLM beneath the interior of the SCB are not well constrained (e.g.,

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Section: Lab Depth and Compositional Structurecontrasting

confidence: 71%

Section: Lab Depth and Compositional Structurementioning

confidence: 53%

Section: Discussionmentioning

confidence: 99%

Section: Phanerozoic Intraplate Magmatismmentioning

confidence: 99%

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Thermochemical State of the Upper Mantle Beneath South China From Multi‐Observable Probabilistic Inversion

Yang

Afonso

et al. 2021

JGR Solid Earth

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“…In contrast, Kent et al (1998) have concluded that Damodar magmatism was induced by partial melting at the margins of the Kerguelen hot spot, and it is suggested by Lehman et al (2010) that the Kodomali and Behradih lamproites resulted from the plume that produced the Deccan traps. Note that a similar hypothesis has been advanced by Xiang et al (2020) for the 260 Ma Baifen cratonic lamproites of the Yangtze Block (China) involving melting at the margins of the mantle plume initiating the Emeishan large igneous province. The common factor in these plume models is the rapid extension, thinning, and decompressional melting of the lithosphere induced by plume-related asthenospheric upwelling.…”

Section: Indian Lamproitesmentioning

confidence: 54%

Igneous Rock Associations 26. Lamproites, Exotic Potassic Alkaline Rocks: A Review of their Nomenclature, Characterization and Origins

Mitchell

2020

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Lamproite is a rare ultrapotassic alkaline rock of petrological importance as it is considered to be derived from metasomatized lithospheric mantle, and of economic significance, being the host of major diamond deposits. A review of the nomenclature of lamproite results in the recommendation that members of the lamproite petrological clan be named using mineralogical-genetic classifications to distinguish them from other genetically unrelated potassic alkaline rocks, kimberlite, and diverse lamprophyres. The names “Group 2 kimberlite” and “orangeite” must be abandoned as these rock types are varieties of bona fide lamproite restricted to the Kaapvaal Craton. Lamproites exhibit extreme diversity in their mineralogy which ranges from olivine phlogopite lamproite, through phlogopite leucite lamproite and potassic titanian richterite-diopside lamproite, to leucite sanidine lamproite. Diamondiferous olivine lamproites are hybrid rocks extensively contaminated by mantle-derived xenocrystic olivine. Currently, lamproites are divided into cratonic (e.g. Leucite Hills, USA; Baifen, China) and orogenic (Mediterranean) varieties (e.g. Murcia-Almeria, Spain; Afyon, Turkey; Xungba, Tibet). Each cratonic and orogenic lamproite province differs significantly in tectonic setting and Sr–Nd–Pb–Hf isotopic compositions. Isotopic compositions indicate derivation from enriched mantle sources, having long-term low Sm/Nd and high Rb/Sr ratios, relative to bulk earth and depleted asthenospheric mantle. All lamproites are considered, on the basis of their geochemistry, to be derived from ancient mineralogically complex K–Ti–Ba–REE-rich veins, or metasomes, in the lithospheric mantle with, or without, subsequent contributions from recent asthenospheric or subducted components at the time of genesis. Lamproite primary magmas are considered to be relatively silica-rich (~50–60 wt.% SiO2), MgO-poor (3–12 wt.%), and ultrapotassic (~8–12 wt.% K2O) as exemplified by hyalo-phlogopite lamproites from the Leucite Hills (Wyoming) or Smoky Butte (Montana). Brief descriptions are given of the most important phreatomagmatic diamondiferous lamproite vents. The tectonic processes which lead to partial melting of metasomes, and/or initiation of magmatism, are described for examples of cratonic and orogenic lamproites. As each lamproite province differs with respect to its mineralogy, geochemical evolution, and tectonic setting there is no simple or common petrogenetic model for their genesis. Each province must be considered as the unique expression of the times and vagaries of ancient mantle metasomatism, coupled with diverse and complex partial melting processes, together with mixing of younger asthenospheric and lithospheric material, and, in the case of many orogenic lamproites, with Paleogene to Recent subducted material.

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Multistage mantle metasomatism deciphered by Mg−Sr−Nd−Pb isotopes in the Leucite Hills lamproites

Sun

Teng

Pang

et al. 2021

Contrib Mineral Petrol

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Geochemical and Sr–Nd–Pb isotopic constraints on the origin and petrogenesis of Paleozoic lamproites in the southern Yangtze Block, South China

Cited by 12 publications

References 106 publications

Thermochemical State of the Upper Mantle Beneath South China From Multi‐Observable Probabilistic Inversion

Thermochemical State of the Upper Mantle Beneath South China From Multi‐Observable Probabilistic Inversion

Igneous Rock Associations 26. Lamproites, Exotic Potassic Alkaline Rocks: A Review of their Nomenclature, Characterization and Origins

Multistage mantle metasomatism deciphered by Mg−Sr−Nd−Pb isotopes in the Leucite Hills lamproites

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