|Table of Contents|

Geochemical Characteristics, Petrogenesis and Tectonic Implications of Mid-Jurassic Adakitic Granodiorites in Lishui Sag of East China Sea Basin(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2025年第05期
Page:
912-928
Research Field:
基础地质与矿床地质
Publishing date:

Info

Title:
Geochemical Characteristics, Petrogenesis and Tectonic Implications of Mid-Jurassic Adakitic Granodiorites in Lishui Sag of East China Sea Basin
Author(s):
CAI Hao-long1;  GUO Jin-wei1;  LIU Bin1; 2*;  HUANG Xiao-song3;  TANG Xian-jun3;  ZHU Zheng-ping1;  CHENG Qi1
(1. School of Geosciences, Yangtze University, Wuhan 430100, Hubei, China; 2. Hubei Engineering Research Center of Unconventional Petroleum Geology and Engineering, Yangtze University, Wuhan 430100, Hubei, China; 3. Shanghai Branch of CNOOC(China)Ltd., Shanghai 200335, China)
Keywords:
geochemistry;  adakite;  granodiorite;  zircon U-Pb age;  Jurassic;  magma arc belt;  Paleo-Pacific Plate subduction;  East China Sea Basin
PACS:
P587; P597
DOI:
10.19814/j.jese.2025.02024
Abstract:
Currently, the research on adakitic rocks in Lishui sag of East China Sea Basin is relatively limited, and there is still a lack of systematic understanding regarding their genesis and their connection with the Paleo-Pacific Plate(PPP)subduction process. Whole-rock geochemical and zircon U-Pb geochronology of the newly discovered adakitic granodiorites in Lishui sag were analyzed; both the petrogenetic mechanisms and tectonic setting of the adakitic granodiorites were investigated; and Jurassic tectonic setting of Lishui sag in East China Sea Basin and the relationship between PPP subduction and associated magmatic arc belt were discussed. The results show that LA-ICP-MS zircon U-Pb dating yields crystallization ages of(170.9±1.3)and(171.7±1.1)Ma; whole-rock geochemical analyses reveal relatively high Sr/Y and La/Yb ratios, and low Ni and MgO contents, consistent with the chemical characteristics of C-type adakites derived from the lower crust; the Mg#value, K2O content, and Na2O/K2O ratio suggest that the adakitic granodiorites may originate from partial melting of thickened lower crust. Combined with the coeval granodiorites in Oujiang sag of East China Sea Basin, as well as the arc-related magmatic rocks in South China Sea and Hida region of Japan, the adakitic granodiorites collectively form a SW-NE trending magmatic arc belt along the eastern coastal region of China. In general, the formation of the magmatic arc belt is closely related to the compressional tectonic setting induced by the Mesozoic PPP subduction, showing the influence of Yanshan movement on East China Sea Basin region, which may have triggered localized crustal thickening in the eastern coastal region of China(e.g. Lishui sag).

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