On the origin of mafic magmatic enclaves (MMEs) in syn-collisional granitoids: evidence from the Baojishan pluton in the North Qilian Orogen, China

Chen, Shuo; Niu, Yaoling; Sun, Wenli; Li, Jiyong; Guo, Pengran; Sun, Pu

doi:10.1007/s00710-015-0383-5

Cited by 57 publications

(87 citation statements)

References 70 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Sr─Nd isotopic compositions of five fresh samples from the Tadong pluton were determined, with initial Sr─Nd isotopic ratios calculated using the zircon U─Pb age of the Tadong pluton (513 Ma). The initial Sr values of these samples (0.7056–0.7062) are consistent with the initial Sr values of I‐type granites within the Qilian orogenic belt (Chen et al, ). These samples have εNd (t) values of 0 to 1.3.…”

Section: Resultssupporting

confidence: 84%

Geochronology and geochemistry of early Palaeozoic intrusive rocks in the Lajishan area of the eastern south Qilian Belt, Tibetan Plateau: Implications for the tectonic evolution of South Qilian

et al. 2018

View full text Add to dashboard Cite

The Lajishan area, located in the South Qilian orogenic Belt, north‐eastern Tibetan Plateau, contains a compositionally diverse range of Cambrian to early Ordovician felsic intrusions that reflect the early Palaeozoic tectonic evolution of the Central Qilian Belt. This paper presents new geochemical, Sr─Nd and Lu─Hf isotopic, and zircon U─Pb data for the Tadong, Huangcaoshan, and Yindonggou plutons in the eastern Lajishan area. LA‐ICPMS U─Pb ages of 517.4 ± 1 Ma for the Tadong pluton which is the first find Late Cambrian granitoids in this area, 467 ± 1 Ma for the Huangcaoshan pluton and 446 ± 1 Ma for the Yindonggou pluton. The new data indicate that the Tadong pluton and Huangcaoshan pluton belong to I‐type granite. Their A/CNK values range from 0.82 to 1.03, suggesting a close relationship with I‐type granitoids. Their trace‐element geochemical characteristics include enrichments in the LILEs, pronounced depletions in Nb and Ta, enrichment of the LREEs relative to the HREEs, and Eu anomalies. These features are similar to those of I‐type volcanic‐arc magmas. Combined with Hf and Sr─Nd isotopic data, The Tadong pluton generated by the mixing of melts was derived from the partial melting of the Precambrian basement and mantle‐derived magmas. The Huangcaoshan pluton was derived from juvenile crust with contamination. The Yindonggou pluton shows A‐type characteristics, their A/NCK is 0.88–1.07, and 10000 × Ga/Al is higher than 2.6. They were characteristic with high Sr, low Y, low Yb, and enriched LREE. Combined with Hf and Sr─Nd isotopic data, the Yindonggou pluton was generated by the partial melting of oceanic slab material and was crustally contaminated associated with slab breakoff. Combined previous research suggests that Tadong pluton and Huangcaoshan pluton formed from southern subduction of the South Qilian ocean into the Central Qilian Belt; the Yindonggou pluton formed in collisional setting.

show abstract

Section: Resultssupporting

confidence: 84%

Geochronology and geochemistry of early Palaeozoic intrusive rocks in the Lajishan area of the eastern south Qilian Belt, Tibetan Plateau: Implications for the tectonic evolution of South Qilian

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The MMEs are less contaminated because they are earlier cumulate whereas the remaining magma continues to evolve and assimilate with the crustal country lithologies before solidified as the granitoid hosts. This is a straightforward geological process (Chen et al, ; Niu et al, ). It is worthy to note that the bulk composition of the JCB‐MME sample is gabbroic diorite (lack of pyroxene), which is different from the granodioritic compositions of other MMEs because of it contains more hornblende.…”

Section: Discussionmentioning

confidence: 99%

“…In this hypothesis, during continental collision, the remaining subducted ocean crust undergoes partial melting under amphibolite facies conditions, which produces and preserves granitoid magmas, contributing to net growth of continental crust. Because globally, active seafloor subduction is continuous, but continental collision is episodic, this hypothesis also satisfies the episodic growth of the continental crust and overcomes the difficulties of “island arc model.” This hypothesis has been tested with success along several orogenic belts on the greater Tibetan Plateau (Chen et al, ; Huang et al, ; Mo et al, 2007; Mo et al, ; Niu & O'Hara, ; Niu et al, ; Shao et al, ; Zhang et al, ).…”

Section: Introductionmentioning

confidence: 99%

The syncollisional granitoid magmatism and crust growth during the West Qinling Orogeny, China: Insights from the Jiaochangba pluton

et al. 2018

Self Cite

View full text Add to dashboard Cite

The West Qinling Orogenic Belt (WQOB) is a major portion of the Qinling‐Dabie‐Sulu Orogen and holds essential information for understanding the protracted evolution of the north‐eastern branch of the Paleo‐Tethys in East Asia. In this study, we report our petrological, geochemical, and geochronological study on the five Triassic granitoid plutons of West Qinling with emphasis on the poorly studied Jiaochangba pluton with zircon U–Pb ages of 217.5 ± 1.6 Ma and 215.2 ± 1.2 Ma. The new data and the existing data on the other four plutons support the view that the West Qinling granitoids represent a magmatic response to the continental collision of the Yangtze Block (YB) with the North China Craton (NCC) in the Triassic. Like the other four plutons, the Jiaochangba pluton shows strong light rare earth element (REE) enrichment and weak heavy REE depletion ([La/Sm]N ≈ 7.14 ± 1.89; [Sm/Yb]N ≈ 4.63 ± 1.85) with varying negative Eu anomalies (Eu/Eu* ≈ 0.65 ± 0.20). In the N‐MORB normalized diagram, all the samples show relative enrichment in Rb, Pb, U, and K with negative Nb, Ta, P, and Ti anomalies, resembling those of the model continental crust. The Jiaochangba pluton has relatively lower (87Sr/86Sr)i (0.7062 to 0.7081), higher εNd(t) (−6.91 to −2.09), and εHf(t) (−5.57 to −0.14) than mature continental crust, which are consistent with their source being dominated by lower crust with significant mantle contributions. Mantle‐derived melt, which formed from partial melting of mantle wedge peridotite facilitated by dehydration of the subducted/subducting Mianlue ocean crust, provide the required heat for the crustal melting while also contributing to the compositions of these granitoids. Evolution of such parental magmas in open system crustal magma chambers with continued evolution/replenishment and crustal contamination and assimilation give rise to the observed petrological and geochemical characteristics of these granitoids.

show abstract

“…Another interpretation is that MMEs represent cumulates from more primitive andesitic melt of the same magmatic system (Barbarin, 2005;Niu et al, 2013;Huang et al, 2014;Chen et al, 2015).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…They are elliptical and have similar mineral assemblages as the granitoids but with greater mafic (e.g., amphibole) mineral modes, indicating that the MMEs in the LJ pluton were not formed by magma mixing (Niu et al, 2013;Chen et al, 2015).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Zircon U–Pb geochronology, Sr–Nd–Hf isotopic composition and geological significance of the Late Triassic Baijiazhuang and Lvjing granitic plutons in West Qinling Orogen

Duan

Niu

Kong

et al. 2016

Lithos

Self Cite

View full text Add to dashboard Cite

) 'Zircon UPb geochronology, Sr-Nd-Hf isotopic composition and geological signicance of the Late-Triassic Baijiazhuang and Lvjing granitic plutons in West Qinling Orogen. ', Lithos, Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPTPage 2 of 31 AbstractThe

show abstract

On the origin of mafic magmatic enclaves (MMEs) in syn-collisional granitoids: evidence from the Baojishan pluton in the North Qilian Orogen, China

Cited by 57 publications

References 70 publications

Geochronology and geochemistry of early Palaeozoic intrusive rocks in the Lajishan area of the eastern south Qilian Belt, Tibetan Plateau: Implications for the tectonic evolution of South Qilian

Geochronology and geochemistry of early Palaeozoic intrusive rocks in the Lajishan area of the eastern south Qilian Belt, Tibetan Plateau: Implications for the tectonic evolution of South Qilian

The syncollisional granitoid magmatism and crust growth during the West Qinling Orogeny, China: Insights from the Jiaochangba pluton

Zircon U–Pb geochronology, Sr–Nd–Hf isotopic composition and geological significance of the Late Triassic Baijiazhuang and Lvjing granitic plutons in West Qinling Orogen

Contact Info

Product

Resources

About