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Geochemistry of middle-late Mesozoic mafic intrusions in the eastern North China Craton: New insights on lithospheric thinning and decratonization

Wan, Le and Zeng, Zuoxun and Kusky, Timothy and Asimow, Paul and He, Chicheng and Liu, Yongjiang and Yang, Shuang and Xu, Shaopeng (2019) Geochemistry of middle-late Mesozoic mafic intrusions in the eastern North China Craton: New insights on lithospheric thinning and decratonization. Gondwana Research, 73 . pp. 153-174. ISSN 1342-937X. https://resolver.caltech.edu/CaltechAUTHORS:20190430-075323548

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Abstract

We present detailed geochronological, geochemical and Sr-Nd-Pb isotopic data for late Mesozoic mafic intrusions in the Taili region (western Liaodong Province) of the eastern North China Craton (NCC). We obtained laser-ablation inductively-coupled plasma mass spectrometry U-Pb zircon ages from lamprophyres with ages ranging from 139 to 162 Ma and diorites with clusters of ages at 226 ± 11 Ma, 165 ± 5.8 Ma and 140 ± 4.8 Ma. We interpret the Triassic zircons in diorites to be inherited from the Paleo-Asian Ocean slab. Both the lamprophyres and diorites contain abundant inherited grains (2644–2456 Ma) that were likely derived from the ancient NCC basement, reflecting a contribution from old lower crustal material. Like contemporaneous late Mesozoic mafic rocks in the Jiaodong and Liaodong Peninsula areas of the NCC, the Taili lamprophyres reveal a strong subduction signature in their normalized trace element patterns, including depletion of high field strength elements and enrichment of large ion lithophile elements. The rare-earth element patterns of the Taili intermediate-mafic intrusions are best explained if they were principally derived from partial melting of amphibole-bearing lherzolite in the spinel-garnet transition zone. Slab-derived melts likely contributed to the formation of late Mesozoic mafic rocks along three margins of the craton: due to accretion of the Yangtze Block along the southern margin of the craton, subduction of the Paleo-Asian Ocean along the northern margin, and subduction of the Paleo-Pacific oceanic plate along the eastern margin of NCC. We present a synthesis of the geochemical, spatial, and temporal patterns of magmatic rocks and periods of deformation that contributed to decratonization of the NCC in response to the Mesozoic tectonic evolution of adjacent plates along its northern, southern, and eastern margins.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.gr.2019.04.004DOIArticle
ORCID:
AuthorORCID
Asimow, Paul0000-0001-6025-8925
Additional Information:© 2019 Published by Elsevier B.V. on behalf of International Association for Gondwana Research. Received 26 January 2019, Revised 20 March 2019, Accepted 7 April 2019, Available online 24 April 2019.
Funders:
Funding AgencyGrant Number
National Natural Science Foundation of China41230206
China University of GeosciencesMSFGPMR02
Subject Keywords:North China Craton; Mafic rocks; Isotope and geochemistry; Late Mesozoic; Lithospheric thinning
Record Number:CaltechAUTHORS:20190430-075323548
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190430-075323548
Official Citation:Le Wan, Zuoxun Zeng, Timothy Kusky, Paul Asimow, Chicheng He, Yongjiang Liu, Shuang Yang, Shaopeng Xu, Geochemistry of middle-late Mesozoic mafic intrusions in the eastern North China Craton: New insights on lithospheric thinning and decratonization, Gondwana Research, Volume 73, 2019, Pages 153-174, ISSN 1342-937X, https://doi.org/10.1016/j.gr.2019.04.004. (http://www.sciencedirect.com/science/article/pii/S1342937X1930108X)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95102
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:30 Apr 2019 17:17
Last Modified:03 Oct 2019 21:10

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