Citation: | ZHANG Zhihui, ZHANG Da, HE Xiaolong, HU Bojie, ZHU Xinyou, DU Zezhong, JIA Wenbin, GONG Xiaodong. 2021. Biotite granodiorite age of Jiuling complex in Jiangxi Province and its limitation on the collision and splicing time of the Yangtze and Cathay plates[J]. Geology in China, 48(5): 1562-1579. doi: 10.12029/gc20210518 |
In order to explore the magmatic origin and tectonic setting of the Jiuling pluton in northern Jiangxi, a combined study of geochronology, geochemistry and zircon Lu-Hf isotope was carried out for the Dahutang biotite granodiorite. LA-ICP-MS zircon U-Pb dating of biotite granodiorite suggests it was formed at (835.6±1.5) Ma. Geochemistry analysis shows it belongs to the series of potassium-high potassium calcium alkaline peraluminous granite. It has the typical characteristics of S-type granite and it was derived from the melting of the Neoproterozoic Shuangqiaoshan Group. The positive zircon εHf (t) value (2.8-8.2) suggests that the magma forming the granite was originated from the recycling of Proterozoic crustal material. The Dahutang biotite granodiorite was formed in a tectonic background of transition stage from syn-collision to post-collision. Combining with previous studies, it is inferred that that the upper time limit of collision between the Yangtze and Cathaysia plate should be about 835 Ma.
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Tectonic location of the Dahutang tungsten polymetallic deposit in South China (a) and Jiangxi Province (b, from Huang and Jiang, 2012) and its Sketch geological map (c, from Xiang et al., 2012)
Geological section of line 4 in the Shimensi Wu deposit, Dahutang
Occurrence and photos of the Dahutang biotite granodiorite
Cathodoluminescence images of the zircons from the Dahutang biotite granodiorite
U-Pb zircon concordia plots of the Dahutang biotite granodiorite
Discrimination diagrams of major element of the Dahutang biotite granodiorite
Primitive mantle-normalized trace element patterns (a) and chondrite-normalized REE distribution patterns (b) of the biotite granodiorite
The εHf(t) vs t diagram of the Dahutang biotite granodiorite
Genetic type discrimination diagram of the Dahutang biotite granodiorite (a, after Li Xianhua, 1999)
Discrimination diagram for the source rock of the Dahutang biotite granodiorite (after Sylvester, 1998)
Discrimination diagram of tectonic setting for the Dahutang biotite granodiorite (after Pearce et al., 1984)