NDLI: Zircon U-Pb dating for the earliest Neoproterozoic mafic magmatism in the southern margin of the North China Block

Content Provider	Springer Nature Link
Author	Liu, Yongqing Gao, Linzhi Liu, Yanxue Song, Biao Wang, Zongxiu
Copyright Year	2006
Abstract	Huge diabase occurs within the Proterozoic strata in the southern margin of the North China Block, geographically in the northern parts of Anhui and Jiangsu provinces, where no strata younger than Neoproterozoic have been found. Zircons from the diabase show three different structures from cathodoluminesecence imaging, but they are all of magmatic origin. SHRIMP U-Pb dating yields a range of $^{206}$Pb/$^{238}$U ages from 2600 to 124 Ma, but two geological events can clearly be identified from both concordant and discordant ages. One gives two weighted mean $^{207}$Pb/$^{206}$Pb ages of 976 ± 24 and 1038 ± 26 Ma which are interpreted as timing of diabase crystallization, and the other has a weighted mean $^{207}$Pb/$^{206}$Pb age of 2523 ± 52 Ma that represents formation time of inherited zircon from the old crust. The dating results indicate that the mafic magmatic event occurred in a transition period from the latest Mesoproterozoic to the earliest Neoproterozoic, consistent with global subduction of Grenvill ocean crust to result in the assembly of supercontinent Rodinia. Therefore, the North China Block needs to be taken into account when reconstructing the position of China continents within the framework of Rodinia supercontinent.
Starting Page	2375
Ending Page	2382
Page Count	8
File Format	PDF
ISSN	10016538
Journal	Chinese Science Bulletin
Volume Number	51
Issue Number	19
e-ISSN	18619541
Language	English
Publisher	Science in China Press
Publisher Date	2006-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	North China Neoproterozoic diabase U-Pb zircon dating reconstruction of Rodinia Science Chemistry/Food Science Geosciences Life Sciences Physics Engineering
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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