苏鲁造山带五莲新元古代花岗岩类成因的Sr-Nd同位素证据

薛怀民; 刘福来; 孟繁聪

Volume 31 Issue 4

Jul. 2006

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Article Navigation > Earth Science > 2006 > 31(4): 497-504

XUE Huai-min, LIU Fu-lai, MENG Fan-cong, 2006. Petrogenesis of Neoproterozoic Granitoids from the Wulian Region in the Sulu Orogen: Sr-Nd Isotopic Constraints. Earth Science, 31(4): 497-504.

Citation:

XUE Huai-min, LIU Fu-lai, MENG Fan-cong, 2006. Petrogenesis of Neoproterozoic Granitoids from the Wulian Region in the Sulu Orogen: Sr-Nd Isotopic Constraints. Earth Science, 31(4): 497-504.

XUE Huai-min, LIU Fu-lai, MENG Fan-cong, 2006. Petrogenesis of Neoproterozoic Granitoids from the Wulian Region in the Sulu Orogen: Sr-Nd Isotopic Constraints. Earth Science, 31(4): 497-504.

Citation:

XUE Huai-min, LIU Fu-lai, MENG Fan-cong, 2006. Petrogenesis of Neoproterozoic Granitoids from the Wulian Region in the Sulu Orogen: Sr-Nd Isotopic Constraints. Earth Science, 31(4): 497-504.

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Petrogenesis of Neoproterozoic Granitoids from the Wulian Region in the Sulu Orogen: Sr-Nd Isotopic Constraints

Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

Received Date: 2006-04-08
Publish Date: 2006-07-25

Abstract

Abstract

The Neoproterozoic granitoids in Wulian region are located north of the Wulian fault. They have undergone strong dynamic deformation but are slightly metamorphosed (green-schist facies). The granitoids are mainly biotite-syenogranitic in composition with minor quartz syenitic. The initial ⁸⁷Sr/⁸⁶ Sr ratios (I_Sr) are wide, ranging from 0.697 306 to 0.753 765. This may partially be ascribed to the inhomogeneity of magma source material or multi-source mixing with different proportions. Secondary disturbed after the granitic body's intrusion and concretion may also play a role, to some degree. The ε_Nd (750 Ma) values of the granitoids are all lower than 0 and with wide ranges (-3.1 to-24.3), and the model ages (T_DM) of two stages ranges from 1.7 to 3.4 Ga. This indicates that the parental magma of the Neoproterozoic granitoids in the Wulian region was primarily derived from crustal materials but with the mixed features of multi-sources. Therefore, the Neoproterozoic granitoids in Wulian have most probably been generated by partial melting of Archaean TTG gneisses (major tonalitic component thereinto) at pressures of about 0.8 Gpa (i.e. within the middle or the lower crust), and the addition of different proportions of mantle-derived juvenile materials. The addition of mantle-derived materials has been an important influence on the genesis of the Neoproterozoic granitoids in the Wulian region.
- granitoid,
- Sr and Nd isotope,
- partial melting,
- Wulian,
- Sulu orogen

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References(44)

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Petrogenesis of Neoproterozoic Granitoids from the Wulian Region in the Sulu Orogen: Sr-Nd Isotopic Constraints

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