Petrological and mineralogical constraints on the formation of Neoproterozoic calc-alkaline continental crust: The example of the Luding Intrusive complex, western Yangtze Block, South China

doi:10.1016/j.lithos.2023.107484

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	Petrological and mineralogical constraints on the formation of Neoproterozoic calc-alkaline continental crust: The example of the Luding Intrusive complex, western Yangtze Block, South China
	Zhu, Yu 3; Lai, Shao-cong 3; Rezeau, Herve 4; Zhu, Ren-Zhi 3; Liu, Min 3; Qin, Jiang-Feng 3; Zhao, Shao-wei 1; Zhang, Fang-yi 2; Yang, Hang 3
刊名	LITHOS
	2024-03-01
卷号	468 页码:15
关键词	Neoproterozoic continental arc Western Yangtze Block Luding Intrusive complex (LIC) Trans-crustal magmatic system Cogenetic fractional crystallization
ISSN号	0024-4937
DOI	10.1016/j.lithos.2023.107484
通讯作者	Zhu, Yu(yuzhunwu@163.com) ; Lai, Shao-cong(shaocong@nwu.edu.cn)
英文摘要	Decoding the trans -crustal magmatic evolution processes from exposed paleo-depth that are otherwise inaccessible above continental arc zone is instructive to understand the geochemical fractionation of arc magmatism and geochemical stratification of continental crust. To unravel trans -crustal magmatic processes leading to the formation of Neoproterozoic continental arc, we combined a comprehensive dataset of petrography, zircon U-Pb geochronology, whole -rock major and trace elements, and Sr-Nd isotopes as well as zircon Lu-Hf isotopes for the Neoproterozoic calc-alkaline Luding Intrusive Complex (LIC) in the western Yangtze Block, South China. The LIC is composed of monzodiorites, gabbro-diorites, diorites, and granodiorites that formed at ca. 783-779 Ma. The LIC lithologies are calc-alkaline with highly variable Mg# values (40.8-70.6) and subductionrelated trace elemental patterns. In combination with predominantly depleted and comparable whole -rock Sr-Nd (initial 87Sr/86Sr = 0.703244-0.704248 and epsilon Nd(t) = +2.35 - +5.10) and zircon Hf isotopes (epsilon Hf(t) = +4.47 - +9.99), the LIC originated from a common subduction fluids-metasomatized mantle source. The hornblende geothermobarometry and whole -rock normative mineral trajectories as well as previously experimental results collectively suggest that the crystallization of LIC occurred within the middle crustal level (11.4-20.9 km) at various temperatures (776-875 degrees C) and pressures (2.50-5.50 kbar), and underwent different degrees of fractional crystallization of predominant hornblende and plagioclase phases during the assemblage and solidification of cogenetic and multiple batches magmatic pluming. The diorites-granodiorites result from fractionation of early olivine + clinopyroxene phases followed by subsequent amphibole + plagioclase phases, and the monzodiorites mainly represent accumulation residues of dominant hornblende + plagioclase phases from more fractionated melts, while the gabbro-diorites underwent the fractionation from an isotopically homogeneous mantle source, but differ in their elemental compositions. The LIC from Neoproterozoic continental arc suggests that the cogenetic fractional crystallization of mantle -derived melts in intra-crustal magmatic system can account for the petrochemical diversities of arc magmatic rocks during the construction of the Neoproterozoic continental arc crust in the western Yangzte Block, South China.
资助项目	China Postdoctoral Science Foundation[2021M702647] ; Young Talent Fund of Association for Science and Technology in Shaanxi, China[20230706]
WOS关键词	HF ISOTOPES ; ISLAND-ARC ; CRYSTALLIZATION ; SUBDUCTION ; EVOLUTION ; ORIGIN ; MA ; DIFFERENTIATION ; CLASSIFICATION ; FRACTIONATION
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:001153696100001
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/184335]
专题	海洋研究所_深海极端环境与生命过程研究中心
通讯作者	Zhu, Yu; Lai, Shao-cong
作者单位	1.Changan Univ, Sch Earth Sci & Resources, Key Lab Western Chinas Mineral Resources & Geol En, Minist Educ, Xian 710054, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China 3.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China 4.Univ Arizona, Dept Geosci, Tucson, AZ 85721 USA
推荐引用方式 GB/T 7714	Zhu, Yu,Lai, Shao-cong,Rezeau, Herve,et al. Petrological and mineralogical constraints on the formation of Neoproterozoic calc-alkaline continental crust: The example of the Luding Intrusive complex, western Yangtze Block, South China[J]. LITHOS,2024,468:15.
APA	Zhu, Yu.,Lai, Shao-cong.,Rezeau, Herve.,Zhu, Ren-Zhi.,Liu, Min.,...&Yang, Hang.(2024).Petrological and mineralogical constraints on the formation of Neoproterozoic calc-alkaline continental crust: The example of the Luding Intrusive complex, western Yangtze Block, South China.LITHOS,468,15.
MLA	Zhu, Yu,et al."Petrological and mineralogical constraints on the formation of Neoproterozoic calc-alkaline continental crust: The example of the Luding Intrusive complex, western Yangtze Block, South China".LITHOS 468(2024):15.