Genetic relationship between 1780 Ma dykes and coeval volcanics in the Lvliang area, North China

doi:10.1016/j.precamres.2017.10.004

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 > 岩石圈演化国家重点实验室

	Genetic relationship between 1780 Ma dykes and coeval volcanics in the Lvliang area, North China
	Yang, Shuyan 1,2; Peng, Peng 1,2; Qin, Zhaoyuan 3; Wang, Xinping 1,2; Wang, Chong 1,2; Zhang, Jing 1; Zhao, Taiping 4
刊名	PRECAMBRIAN RESEARCH
	2019-08-01
卷号	329 页码:232-246
关键词	North China Craton Paleoproterozoic Lvliang dykes Xiaoliangling Group Immiscibility
ISSN号	0301-9268
DOI	10.1016/j.precamres.2017.10.004
英文摘要	The 1780 Ma dykes and coeval volcanics constitute a large igneous province in the North China Craton; however, whether these dykes and volcanic rocks of varying compositions originated from one or multiple sources remains controversial. The ca. 1780 Ma Lvliang dykes are characterized by widespread E-W-oriented dykes and minor N-W-oriented diabase dykes. The E-W-oriented dykes are bimodal and comprise two subgroups: one is dominated by acidic high-silica dykes (SiO2 > 63 wt%), while the other is dominated by mafic to intermediate relatively low-silica dykes (SiO2 < 63 wt%). The ca. 1780 Ma volcanics (in the Xiaoliangling Group) in the Lvliang area are also bimodal and dominated by rhyolite to dacite volcanics and basalt to andesite volcanics with few clastic interlayers. SIMS U-Pb dating on zircons from one high-silica dyke and a rhyolite volcanic layer yields Pb-207/Pb-206 ages of 1783 +/- 7 Ma and 1776 +/- 6 Ma, respectively, and SIMS U-Pb dating on baddeleyites from a low-silica dyke yields a Pb-207/Pb-206 age of 1789 +/- 5 Ma. They are all tholeiitic in composition (MgO: 0.36.1 wt%; SiO2: 51-74 wt%), enriched in light rare earth elements ((La/Yb)(N) = 7.9-20.2) and show negative anomalies in Nb, Ta, Sr and Eu (Eu/Eu* = 0.30.9). They also have similar in-situ Hf isotopes of baddeleyite/zircon (epsilon Hf values of -14.5 to -1.8) and bulk rock epsilon Nd (-6.7 to -3.0) isotopes. Furthermore, immiscible textures are identified from the Xiaoliangling Group volcanics, which are characterized by some silica-rich melts globules in the Fe-rich magma. These spatiotemporal affinities and geochemical similarities, as well as the identified immiscible textures, reveal that the low-silicate dykes are conduits for the basalt-andesite with significant fractionation of clinopyroxene and plagioclase; while the high-silica dykes are conduits for the rhyolite-dacite with distinct immiscible segregation prior to eruption. In addition, there is a sharp change of epsilon Hf values at 1780-1730 Ma, and their Hf TDM ages are similar to 2750-1950 Ma. As these rocks originated from the subcontinental lithospheric mantle, this may indicate that the subcontinental lithospheric mantle was metasomatized during this time period, possibly by a paleo-plume event.
资助项目	NFSC[41630211] ; Major State Research-Development Project[2016YFC0600109] ; CAS priority strategic program 'Linking the earth Interior Processes and Surface evolution (LIPS)'[XDB18030205] ; National High-Level Talents Special Support Plan project
WOS关键词	ND ISOTOPIC CONSTRAINTS ; PB ZIRCON GEOCHRONOLOGY ; U-PB ; TECTONIC EVOLUTION ; GEOCHEMICAL CHARACTERISTICS ; SOUTHERN MARGIN ; MAFIC DYKES ; PALEOPROTEROZOIC EVOLUTION ; GEOLOGICAL SIGNIFICANCE ; CRATON IMPLICATIONS
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000476961400018
资助机构	NFSC ; NFSC ; Major State Research-Development Project ; Major State Research-Development Project ; CAS priority strategic program 'Linking the earth Interior Processes and Surface evolution (LIPS)' ; CAS priority strategic program 'Linking the earth Interior Processes and Surface evolution (LIPS)' ; National High-Level Talents Special Support Plan project ; National High-Level Talents Special Support Plan project ; NFSC ; NFSC ; Major State Research-Development Project ; Major State Research-Development Project ; CAS priority strategic program 'Linking the earth Interior Processes and Surface evolution (LIPS)' ; CAS priority strategic program 'Linking the earth Interior Processes and Surface evolution (LIPS)' ; National High-Level Talents Special Support Plan project ; National High-Level Talents Special Support Plan project ; NFSC ; NFSC ; Major State Research-Development Project ; Major State Research-Development Project ; CAS priority strategic program 'Linking the earth Interior Processes and Surface evolution (LIPS)' ; CAS priority strategic program 'Linking the earth Interior Processes and Surface evolution (LIPS)' ; National High-Level Talents Special Support Plan project ; National High-Level Talents Special Support Plan project ; NFSC ; NFSC ; Major State Research-Development Project ; Major State Research-Development Project ; CAS priority strategic program 'Linking the earth Interior Processes and Surface evolution (LIPS)' ; CAS priority strategic program 'Linking the earth Interior Processes and Surface evolution (LIPS)' ; National High-Level Talents Special Support Plan project ; National High-Level Talents Special Support Plan project
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/92934]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者	Peng, Peng
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Sch Earth Sci, Beijing 100049, Peoples R China 3.Chengdu Univ Technol, Coll Earth Sci, Chengdu 610059, Sichuan, Peoples R China 4.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangzhou 510640, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Yang, Shuyan,Peng, Peng,Qin, Zhaoyuan,et al. Genetic relationship between 1780 Ma dykes and coeval volcanics in the Lvliang area, North China[J]. PRECAMBRIAN RESEARCH,2019,329:232-246.
APA	Yang, Shuyan.,Peng, Peng.,Qin, Zhaoyuan.,Wang, Xinping.,Wang, Chong.,...&Zhao, Taiping.(2019).Genetic relationship between 1780 Ma dykes and coeval volcanics in the Lvliang area, North China.PRECAMBRIAN RESEARCH,329,232-246.
MLA	Yang, Shuyan,et al."Genetic relationship between 1780 Ma dykes and coeval volcanics in the Lvliang area, North China".PRECAMBRIAN RESEARCH 329(2019):232-246.