Phanerozoic garnet-bearing leucogranite in the northern margin of North China Craton: Characters, timing and preliminary petrogenesis study

doi:10.18654/1000-0569/2019.07.18

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院矿产资源研究重点实验室

	Phanerozoic garnet-bearing leucogranite in the northern margin of North China Craton: Characters, timing and preliminary petrogenesis study
	Fan WenBo 1,2; Jiang Neng 1; Zhai MingGuo 1,2; Hu Jun 1
刊名	ACTA PETROLOGICA SINICA
	2019
卷号	35 期号:7 页码:2237-2258
关键词	Leucogranite Northern margin of NCC Madi granite Tetrad REEs Garnet
ISSN号	1000-0569
DOI	10.18654/1000-0569/2019.07.18
英文摘要	Leucogranites, 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.
WOS关键词	S-TYPE GRANITES ; ASIAN OROGENIC BELT ; PERALUMINOUS GRANITES ; MAGMATIC EVOLUTION ; FRACTIONAL CRYSTALLIZATION ; JURASSIC GRANITOIDS ; TETHYAN HIMALAYA ; W MINERALIZATION ; SOUTHERN CHINA ; INNER-MONGOLIA
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000491151100018
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/93925]
专题	地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者	Fan WenBo
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Northwestern Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Shaanxi, Peoples R China
推荐引用方式 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.