NDLI: Geochemical characteristics of Cretaceous basaltic rocks in South China and constraints on Pacific plate subduction

Content Provider	Springer Nature Link
Author	Chen, Weifeng Chen, Peirong Xu, Xisheng Zhang, Min
Copyright Year	2005
Abstract	Middle-Late Cretaceous Basaltic rocks (85-110 Ma) are distributed in the contemporaneous downfaulted red basins and volcanic-sedimentary basins in South China (including Hunan, Jiangxi, Guangdong, Fujian, Zhejiang provinces). They are geographically divided into two groups delimited by Wuyishan Range, namely the west area basaltic rocks(WABs) distributing over the west of Wuyishan Range and the east area basaltic rocks (EABs) distributing over the east of Wuyishan Range, and observed having distinct geochemical and isotopic characters. WABs are characterized by relatively low in K$_{2}$O (0.44%-3.17%), alkalis (K$_{2}$O+Na$_{2}$O= 3.27%-6.80%) and Al$_{2}$O$_{3}$ (13.08%-16.75%) contents, but high in MgO (5.13%-8.78%) and TiO$_{2}$ (1.12%-3.35%) contents. WABs are similar to ocean-island basalts (OIB) or intraplate basalts on trace elements and isotopes: no negative Nb and Ta anomalies, relatively low σREE (74.66 μg/g-287.72 μg/g) and La$_{N}$/Yb$_{N}$ (4.49-22.10), low ($^{87}$Sr/$^{86}$Sr)$_{i}$ (average ratio is 0.704679), high ε$_{Nd}$(t) (-1.81-8.00). In contrast, EABs display relatively high in K$_{2}$O (0.55%– 4.86%), alkalis (K$_{2}$O+Na$_{2}$O=2.95%-7.55%) and Al$_{2}$O$_{3}$ (15.80%-21.10%) contents, but low in MgO (2.63%-6.28%) and TiO$_{2}$ (1.19%-1.86%) contents, strong negative Nb and Ta anomalies, enrichment in LILE (K, Rb, Ba and Th), relatively high σREE (79.68 μg/g-327.61 μg/g) and La$_{N}$/Yb$_{N}$ (5.25-26.37), high ($^{87}$Sr/$^{86}$Sr)$_{i}$ (average ratio is 0.707658) and negative ε$_{Nd}$(t) (-8.50–1.22), similar to that of IAB (island arc basalts) or CAB (continental arc basalts). Accordingly, WABs were probably generated under continental rifting tectonic setting related to asthenosphere upwelling, and hence their source was characterized by mixing between EMII with DM. Source of EABs may be enriched lithoshperic mantle which had ever undergone the metasomatism of fluid/melt derived from the subducted Pacific plate.This indicates that subduction of a paleo-Pacific plate (Kula) beneath the Eurasian continent had ever occurred during the late Mesozoic period, but the metasomatism resulted from the subduction was only limited to the east of Wuyishan Range.
Starting Page	2104
Ending Page	2117
Page Count	14
File Format	PDF
ISSN	10069313
Journal	Science in China Series D: Earth Sciences
Volume Number	48
Issue Number	12
e-ISSN	18622801
Language	English
Publisher	Science in China Press
Publisher Date	2005-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	basalt imprint of subducted plate rifting Cretaceous basins South China Geosciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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