NDLI: Early J$_{2}$ basalts in SE China: Incipience of large-scale late Mesozoic magmatism

Content Provider	Springer Nature Link
Author	Xie, Xin Xu, Xisheng Zou, Haibo Jiang, Shaoyong Ming, Zhang Qiu, Jiansheng
Copyright Year	2006
Abstract	Magmatism in SE China was dormant during 204–180 Ma, but was reactivated in 180–170 Ma (early J$_{2}$), and then became more and more intensive towards the end of early Cretaceous. The small-scale early J$_{2}$ magmatism is the incipience to long-term and large-scale magmatism in this region. A near east-west (EW) trend volcanic belt was distributed across south Hunan, south Jiangxi and southwest Fujian was formed during early J$_{2}$ time. Along this belt from the inland toward the coast, the lithology of basalts changes from alkali into tholeiite, and the amount of erupted volcanic rocks and the proportions of rhyolites coexisting with the basalts increase. On the basis of geochemical characteristics of these basalts, we infer that the melting degree of source rocks and the extent of fractional crystallization and crustal contamination all increased whereas the depth of mantle source decreased from the inland to the coast, which led to the variations of geological characteristics of the volcanic belt. In early J$_{2}$, the western spreading Pacific plate began to subduct underneath SE China continental block, reactivating near EW trend deep fault that was originally formed during the Indosinian event. The stress of the western spreading Pacific plate and the extent of asthenosphere upwelling increased from the inland to the coast, which is consistent with the generation and evolution of early J$_{2}$ basalts.
Starting Page	796
Ending Page	815
Page Count	20
File Format	PDF
ISSN	10069313
Journal	Science in China Series D: Earth Sciences
Volume Number	49
Issue Number	8
e-ISSN	18622801
Language	English
Publisher	Science in China Press
Publisher Date	2006-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	early J$_{2}$ basalts upwelling of asthenosphere large-scale magmatism SE China the Pacific plate Geosciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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