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Characteristics,genesis and implication of crustal.derived carbonatites
Su BenXun1,2; Wang Jing1; Li XiaoChun1,2; Zhu MingShuai1
AbstractThere are increasing reports of crustal-derived carbonatites in the world since Lentz David R. revisited the crustal derivation of some carbonatites. This paper focuses on summary of temporal and spatial distribution, occurrence, mineral and rock characteristics, geochemical features, and genetic mechanism of crustal-derived carbonatites reported in last twenty years, and sheds some new outlooks on carbonatite genesis. Crustal-derived carbonatites all occur within orogenic belts, particularly Tethyan Orogenic Belt and Central Asian Orogenic Belt. They span an age range from Proterozoic to Cenozoic with geochemical variations with time. Their country rocks are generally dominated by granitic gneisses and marbles, which had undergone high-grade metamorphism. Geochemically, the crustal-derived carbonatites are mainly calcio-carbonatite and display moderate REE differentiation with negative anomalies of Eu, Nb, Ta, Zr and Hf and positive anomalies of Pb and Sr in trace element patterns. They are plotted between chondrite and continental crust evolution lines in Sr and Nd isotope correlation diagram and between primary mantle-derived carbonatite and limestone in C and O isotope correlation diagram. These features are in some certain distinctive from cratonic carbonatites and resemble much of orogenic carbonatites. Experimental results show that partial melting of calcite and dolomite is feasible at upper crustal pressures and temperatures as low as 650 degrees C if sufficient H2O is present. Partial melting can be enhanced by infiltration of metamorphic fluids or hydrothermal brines expelled from nearby silicate rocks. The mineral assemblages and geochemical signatures of anatectic carbonatites resemble those of marbles and their limestone or dolostone protoliths. Therefore, establishing that partial melting has occurred may not be straightforward, particularly if melt migration was limited so that the anatectic carbonatite melts did not escape from the (meta)sedimentary source rocks. The genesis of crustal-derived carbonatites is still debated, and the current hypotheses of melting of (meta-)sedimentary rocks could be induced by intermediate-acid magma intrusion, heat flow of basic magmas, high-grade regional metamorphism, or crustal anataxis. The identification of crustal-derived carbonatites provides some reasonable interpretations on some problems of carbonatite genesis, and also challenges the idea of mantle derivation. They are questioning the petrological tracer of carbonatites in mantle evolution, deep carbon cycle, and plate subduction, and opening a new window to probe the orogenic process, metamorphism, crustal anataxis and carbonatite mineralization
KeywordCarbonatite Crustal derivation Orogenic belt Marble Partial melting Crustal assimilation
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000905312500013
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Document Type期刊论文
Corresponding AuthorSu BenXun
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
First Author AffilicationKey Laboratory of Mineral Resources, Chinese Academy of Sciences
Corresponding Author AffilicationKey Laboratory of Mineral Resources, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Su BenXun,Wang Jing,Li XiaoChun,et al. Characteristics,genesis and implication of crustal.derived carbonatites[J]. ACTA PETROLOGICA SINICA,2022,38(12):3747-3759.
APA Su BenXun,Wang Jing,Li XiaoChun,&Zhu MingShuai.(2022).Characteristics,genesis and implication of crustal.derived carbonatites.ACTA PETROLOGICA SINICA,38(12),3747-3759.
MLA Su BenXun,et al."Characteristics,genesis and implication of crustal.derived carbonatites".ACTA PETROLOGICA SINICA 38.12(2022):3747-3759.
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