Ages and Geochemical Characteristics of the Sangangshan Monzogranite Intrusion in Guangdong Province and Their Geological Significances
CHEN Chang-sheng1,2, XIE Cai-fu2, FEI Guang-chun1
1. College of Earth Sciences, Chengdu University of Technology,Chengdu 610059, China; 2. College of Earth Sciences, Donghua University of Technology,Nanchang 330000, China
Abstract：In order to explore the chronological and geochemical characteristics of the Sangangshan monzogranite intrusion, the LA-ICP-MS zircon U-Pb isotopic dating and analysis of major and trece elements and REE of the monzogranite have been conducted in this paper. The dating results show that the medium-coarse sized biotite monzogranite and fine porphyritic biotite monzogranite have ages of (96.2±1.3) Ma and (99.5±1.2) Ma, respectively, indicating that they were formed in the late Cretaceous. Their chemical compositions are characterized with rich silicon, K>Na, meta-aluminum to weakly peraluminous, low calcium, low magnesium, and relatively poor iron,. with obvious significant enrichment of large ionophile elements (Rb, Th, U), strong depletion of Ba, Sr, Ti, and P, and slight depletion of Nb. They have relatively low to medium REE contents, with obvious fractionation of LREE and HREE, steeply right-diclined "V" type REE distribution patterns, medium to weak negative Eu anomalies (δEu values of 0.64~0.77). The medium-coarse biotite monogranite has relatively high REE contents. Petrological and geochemical characteristics show that they belong to meta-aluminium to weakly peraluminium I type granite with the crust-mantle mixed origin. The tectonic setting discrimination diagrams show that the Sangangshan intrusion was formed in the volcanic arc granite environment. It is inferred that it's formation could be related to the arc magmatism caused by subduction of Pacific plate. Therefore, it is believed that the Sangangshan intrusion could be formed in the extensional tectonic environment caused by the Pacific plate subduction and trailing edge tension.
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