Institutional Repository of Key Laboratory of Mineral Resources, Chinese Academy of Sciences
| Characteristics,genesis and implication of crustal.derived carbonatites | |
Su BenXun1,2; Wang Jing1 ; Li XiaoChun1,2; Zhu MingShuai1
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| 2022-12-01 | |
| Source Publication | ACTA PETROLOGICA SINICA
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| ISSN | 1000-0569 |
| Volume | 38Issue:12Pages:3747-3759 |
| Abstract | There 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 |
| Keyword | Carbonatite Crustal derivation Orogenic belt Marble Partial melting Crustal assimilation |
| DOI | 10.18654/1000-0569/2022.12.13 |
| WOS Keyword | NORTH CHINA CRATON ; BAYAN OBO ; ORIGIN ; SILICATE ; ROCKS ; ISOTOPE ; ND ; TEMPERATURE ; ANATEXIS ; SOUTH |
| Language | 英语 |
| WOS Research Area | Geology |
| WOS Subject | Geology |
| WOS ID | WOS:000905312500013 |
| Publisher | SCIENCE PRESS |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.iggcas.ac.cn/handle/132A11/106911 |
| Collection | 矿产资源研究院重点实验室 |
| Corresponding Author | Su BenXun |
| Affiliation | 1.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 Affilication | Key Laboratory of Mineral Resources, Chinese Academy of Sciences |
| Corresponding Author Affilication | Key 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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