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Phanerozoic garnet-bearing leucogranite in the northern margin of North China Craton: Characters, timing and preliminary petrogenesis study
Fan WenBo1,2; Jiang Neng2; Zhai MingGuo1,2; Hu Jun2
2019
Source PublicationACTA PETROLOGICA SINICA
ISSN1000-0569
Volume35Issue:7Pages:2237-2258
AbstractLeucogranites, which usually contain very few mafic minerals but with muscovite, tourmaline or garnet, are characteristic igneous rocks in collisional orogens. They were frequently proved to be the products of crustal paragneiss melting, although extensive magmatic differentiation and later evolution was proposed dominantly in their genesis recently. In this paper, we investigate the Phanerozoic garnet -bearing leucogranites, which has been ignored mostly, in the northern margin of North China Craton ( NCC). Taken the Madi stock as an example, the recognized leucogranites in the northern NCC are proved to be typical leucogranite with high silica and A/CNK ratios. They have similar mineral assemblage and geochemical composition with the Manaslu Himalayan leucogranite which was alleged to be S -type granite. The garnets also have prevailing almandine-spessartine composition, which also resembles those in other previously reported leucogranite in the world. However, the available whole rock Sr-O-Nd isotopes and P2O5 contents make their derivation controversial. Their sccattered CaO/Na2O, Rb/Sr and Rb/Ba ratios can' t be confidently interpreted by systematic compositional difference of the sedimentary provenance. Instead, the variable tetrad REE patterns and deviation of Nb/Ta, Zr/Hf, Y/ Ho, K/Rb and Rb/Sr ratios from the common chondrite and granite imply undoubtedly different degree of magma fractional crystallization with later melt -fluids interaction. The most highly evolved leucocratic magma in the region, which is represented by the Madi stock in which columbite and topaz are found here, is economically mineralized. Absence of significant magmatic differentiation in some garnet -bearing leucogranites ( such as the Fangniugou, Houzhuo and some Jiangjia samples) suggests that not all leucogranites are high -evolved granite. Thus, the magma evolution process may contribute to just some imprints of the leucogranites but are not necessary in their genesis. Despite, the highly differentiaon processes, together with the enrichment of fluorine in the late evolutional stage, are crucial to the rare metal mineralization. Temporally, the Phanerozoic garnet -bearing leucogranites appeared in both mid -late Permian and mid -late Jurassic. The former may be related to the collisional process between NCC and the adjacent blocks during the closure of Paleo-Asian Ocean, while the latter seem to be formed contemporaneously with the leucogranite found in South China and Northeastern China area when the Paleo-Pacific ocean plate was subducting beneath the NCC. Further exploration on geodynamics is still needed for the Jurassic ones. So the study promotes our understanding on the petrogenesis of leucogranite and their relationship with rare -metal mineralization and regional tectonic evolution.
KeywordLeucogranite Northern margin of NCC Madi granite Tetrad REEs Garnet
DOI10.18654/1000-0569/2019.07.18
WOS KeywordS-TYPE GRANITES ; ASIAN OROGENIC BELT ; PERALUMINOUS GRANITES ; MAGMATIC EVOLUTION ; FRACTIONAL CRYSTALLIZATION ; JURASSIC GRANITOIDS ; TETHYAN HIMALAYA ; W MINERALIZATION ; SOUTHERN CHINA ; INNER-MONGOLIA
Language英语
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000491151100018
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/93925
Collection矿产资源研究院重点实验室
Corresponding AuthorFan WenBo
Affiliation1.Northwestern Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Shaanxi, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
First Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Fan WenBo,Jiang Neng,Zhai MingGuo,et al. Phanerozoic garnet-bearing leucogranite in the northern margin of North China Craton: Characters, timing and preliminary petrogenesis study[J]. ACTA PETROLOGICA SINICA,2019,35(7):2237-2258.
APA Fan WenBo,Jiang Neng,Zhai MingGuo,&Hu Jun.(2019).Phanerozoic garnet-bearing leucogranite in the northern margin of North China Craton: Characters, timing and preliminary petrogenesis study.ACTA PETROLOGICA SINICA,35(7),2237-2258.
MLA Fan WenBo,et al."Phanerozoic garnet-bearing leucogranite in the northern margin of North China Craton: Characters, timing and preliminary petrogenesis study".ACTA PETROLOGICA SINICA 35.7(2019):2237-2258.
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