Citation: | LIU Yuandong, LI Xiang, XU Lei, CHEN Meijun, LIU Fenglong, CHEN Xiaoyou. 2019. Identification and genesis of the Late Jurassic volcanic rocks in Longquan area, southern Zhejiang Province[J]. Geology in China, 46(6): 1530-1546. doi: 10.12029/gc20190618 |
There has been controversy for a long time that the large-scale volcanic activity of Late Mesozioc in Zhejiang Province began with Late Jurassic or Early Cretaceous? Through zircon U-Pb geochronologic study of volcanic rocks in Longquan area of southern Zhejiang Province, a batch of high precision chronologic data were obtained. These zircon U-Pb ages are between 163 Ma to 145 Ma which were confirmed by SHRIMP and LA-ICP-MS. These data indicate that large-scale volcanic avtivity in Zhejiang Province began with Late Jurassic. According to geochemical characteristics and Sr-Nd isotope analysis, these Late Jurassic volcanic rocks belong to peraluminous and high potassium Ca-alkaline series characterized by high SiO2, K2O but low P2O5, FeOT and MgO. Due to the subduction of the Pacific plate in Late Mesozoic, the lower crust material (basement metamorphic rocks) was extensively melted and the late Jurassic volcanic-magmatic rocks in this area were formed. In addition, the authors propose defining a new rock-stratigraphic unit named" the Late Jurassic Huangmaojian Group"so as to better express and contrast.
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Geological map of the study area
Columnar section of the volcanic rocks in the study area
Microphotograph of rhyolitic welded tuff (a, b), rhyolite (c) and lithophysa rhyolite (d) (crossed nicols)
Zircon CL images of the volcanic rocks in the study area
Zircon U-Pb concordia diagrams of the volcanic rocks in the study area
Diagrams of the volcanic rocks in the study area
Primitive mantle-normalized trace element spidergram (a) and chondrite-normalized REE patterns (b) of volcanic rocks (after Sun and McDonough, 1989)
Discrimination diagrams illustrating tectonic setting of the volcanic rocks
Age-Isr of volcanic rocks