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《Geochimica》 2015-01
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The zircon SHRIMP U-Pb dating, geochemical characteristics and tectonic setting of Caledonian Yuechengling pluton in the western segment of the Nanling Mountains

BAI Dao-yuan;ZHONG Xiang;JIA Peng-yuan;XIONG Xiong;HUANG Wen-yi;Hunan Institute of Geology Survey;  
Yuechengling pluton in the western segment of the Nanling Mountains is mainly composed of Caledonian and Indosinian granites in the southern and northern parts, respectively. Caledonian granites change with time from medium-fine-grained porphyritic biotite monzogranite, fine-medium-grained porphyritic two-mica monzogranite, fine-grained porphyritic two-mica monzogranite and fine-grained two-mica monzogranite. The Caledonian granites in the eastern part are characterized by massive and gneissic structures. Late Mesozoic extensional-type ductile shear zones occur in the western margin of this pluton. U-Pb zircon dating for a porphyritic biotite monzogranite sample and a mylonitic porphyritic biotite monzogranite sample yield weighted average ages of(436.6±4.8) Ma and(430.5±4.3) Ma, respectively, which indicate that the Yuechengling pluton was formed in late Early Silurian. The rocks are silicon-high(Si O2 = 68.35%―78.10%, 73.29% on average), aluminium-rich(Al2O3 = 11.95%―15.55%, 14.18% on average), potassium-high(K2O = 4.12%―5.62%, 4.95% on average) and alkali-moderate(Na2O+K2O = 6.18%―8.30%, 7.58% on average) with K2O/Na2 O value of 1.36―2.82(1.94 on average) and ASI value of 1.04―1.66(1.23 on average), thus belong to high-K Calc-alkaline series perluminous granitoids. Most samples are depleted in Ba, Nb, Sr, P and Ti, and enriched in Rb,(Th+U+K),(La+Ce), Nd,(Zr+Hf+Sm) and(Y+Yb+Lu). The studied sampels have ∑REE values of 50.43―328.81 μg/g(173.39 μg/g on average), δEu values of 0.21―0.68(0.40 on average),(La/Yb)N values of 0.54―14.04(7.93 on average), ISr values of 0.71912 and 0.72415, εSr(t) values of 207 and 279, εNd(t) values of –11.76―–7.80 and t2 DMages of 1.80―2.12 Ga. The A/MF-C/MF diagram indicates that the Caledonian Yuechengling granites were form by partial melting of mudstones and clastic rocks. All above geochemical characteristics indicate that the granites are S-type granitoid. Multiple oxide-diagrams for discrimination of structural environment show that the granites were formed in post-collisional tectonic setting. According to petrogenesis, discrimination of structural environment and regional tectonic evolution, the formation mechanism of Caledonian Yuechengling granites is inferred as follows: the thickening of crust in Beiliu Movement(in the late Ordovician to the early Silurian) raised the crust temperature, granites formed through parting melting in post-collisional tectonic setting in middle-late Early Silurian.
【Fund】: 中国地质调查局“湖南1︰25万武冈市和永州市幅区调修测”项目(1212011120793);“中国地质构造区划综合研究与区域地质志修编”项目(1212010811032)
【CateGory Index】: P597.3;P583
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