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Formation Age and Geochemical Characteristics of Longmu Granite Body in Ganzhou,Jiangxi Province and Its Tectonic Significance(PDF)

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

Issue:
2012年第03期
Page:
44-56
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Formation Age and Geochemical Characteristics of Longmu Granite Body in Ganzhou,Jiangxi Province and Its Tectonic Significance
Author(s):
HU Gang1;  ZHONG Da-hong2;  DENG Xin1;  YANG Kun-guang1
1. School of Earth Sciences, China University of Geosciences, Wuhan 430074, Hubei, China; 2. Jiangxi Provincial Institute of Geological Survey, Nanchang 330030, Jiangxi, China
Keywords:
geochemistry;  zircon U-Pb dating;  S-type granite;  Longmu Pluton;  Caledonian Movement;  intracontinental orogeny of South China;  Ganzhou;  Jiangxi
PACS:
P588.12+1; P597+.3
DOI:
-
Abstract:
In order to find out the formation age and evolution process of Longmu Granite in Ganzhou of Jiangxi Province, LA-ICP-MS zircon U-Pb dating and isotope geochemistry of biotite granite and like-porphyritic biotite monzogranite in Longmu Pluton were studied. The results showed that the ages of zircon U-Pb dating of biotite granite and like-porphyritic biotite monzogranite were(457±6)Ma and(450±9)Ma respectively, which indicated that the pluton emplaced in Late Ordovician; aluminum saturation index was 1.11-1.29, the ratio of contents(mass fractions)of K2O and Na2O was 0.97-1.51, so the plutons were categorized as strong peraluminous and high potassium calc-alkaline; according to the ACF diagram, the pluton was plotted in the field of S-type granite; Longmu Pluton was enriched in Rb, Th+U, La+Ce, P, Nd, Zr+Hf+Sm and depleted in Ba, Nb, Sr, Ti, so the pluton belonged to the granite with low Ba and Sr on the whole; the ratio of contents of Rb and Sr was 0.60-2.82 with an average of 1.68, which was higher than the average of continental crust and supracrust, so the pluton was categorized as crustal derived granite; according to the A/MF-C/MF diagram, the provenance of pluton was psammite; the content of rare earth element of pluton was lower((113-176)×10-6), the enrichment of light rare earth element was significant, the distribution pattern was significantly right-wing type, and Eu anomaly was 0.38-0.67 and the depletion was more than middle; chemical composition showed that the pluton was S-type strong peraluminous high potassium calc-alkaline granite which was a kind of crustal derived granite, and magma protolith was the psammite source of mature supracrust; the tectonic discrimination diagram, zircon U-Pb dating and field characteristics indicated the pluton emplaced in a post-orogenic extension environment. In general, the emplacement time of Longmu Pluton was the late of Early Paleozoic under the control of Caledonian Movement; Cathaysia Plate and Yangtze Plate collided in Neoproterozoic and then cracked, and in the middle of Ordovician, the two plates happened intracontinental collision again which thickened the crust, and in post-orogenic stage, the crust began to strongly extension and partial melting and formed the mantle crust granite.

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Last Update: 2012-09-20