北秦岭灰池子花岗质复式岩体的源岩讨论——元素-同位素地球化学制约

李伍平; 王涛; 王晓霞

Volume 26 Issue 3

May 2001

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Article Navigation > Earth Science > 2001 > 26(3): 269-278

LI Wuping, WANG Tao, WANG Xiaoxia, 2001. SOURCE OF HUICHIZI GRANITOID COMPLEX PLUTON IN NORTHERN QINLING, CENTRAL CHINA: CONSTRAINED IN ELEMENT AND ISOTOPIC GEOCHEMISTRY. Earth Science, 26(3): 269-278.

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LI Wuping, WANG Tao, WANG Xiaoxia, 2001. SOURCE OF HUICHIZI GRANITOID COMPLEX PLUTON IN NORTHERN QINLING, CENTRAL CHINA: CONSTRAINED IN ELEMENT AND ISOTOPIC GEOCHEMISTRY. Earth Science, 26(3): 269-278.

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SOURCE OF HUICHIZI GRANITOID COMPLEX PLUTON IN NORTHERN QINLING, CENTRAL CHINA: CONSTRAINED IN ELEMENT AND ISOTOPIC GEOCHEMISTRY

1.
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
2.
Department of Earth Science, Chang'an University, Xi'an 710054
3.
Department of Geology, Peiking University, Beijing 100871, China

Received Date: 2000-03-20
Publish Date: 2001-05-25

Abstract

Abstract

Huichizi complex pluton, the largest granitoid pluton in the core of northern Qinling orogenic belt, is composed of three sequences. These granitoid rocks have higher SiO₂ (66.86%-73.48%), Al₂O₃ (14.44%-16.32%), abundant Na₂O (4.17%-4.78%), and lower TiO₂ (< 0.74%), MgO (< 1.18%) and K₂O (< 3.33%) mass fraction, and more enriched in LREE (27.45 < w (La)_N/ w (Yb)_N < 72.99), and distinct negative and weak positive Eu anomaly. In these granitoid rocks, Y, Yb, Sr mass fractions and w (Sr) / w (Y) ratio of trace elements vary respectively from 3.70×10^-6 to 9.77×10^-6 (< 18×10^-6), 0.30×10^-6 to 1.14×10^-6 (< 1.90×10^-6), 310×10^-6 to 775×10^-6 and 47.87 to 114.36. While those of Huichizi complex display multi element patterns with large positive ion lithophile elements (Rb, Ba, Th and Sr) anomalies and high negative field strong elements (Nb, Ta, Ti and Zr) anomalies and indicate the geochemical characteristics of calc alkalic granites and volcanic arc granites. All the granitoid rocks exhibit a similar range of Nd and Sr isotopic ratios: 0.512 31 < w (¹⁴³Nd) / w (¹⁴⁴Nd) < 0.512 38), 0.707 83 < w (⁸⁷Sr) / w (⁸⁶Sr) < 0.708 80, 0.95 Ga < t_DM (depleted mantle model age) < 1.09 Ga, -0.81 < ε (Nd, 437 Ma) < 0.93 and 18 < ε (Sr, 437 Ma) < 32, and show the source of Huichizi complex from basic rocks. These characteristics are similar to those of the Adakitic rocks. The authors think that the granitoid rocks of Huichizi complex may have been the result of the subduction of the southern intracontinent rift along the Danfeng Shangnan fault by a north dipping of the northern intracontinent rift (Erlangping rift) and that along the Zhuyangguan Xiaguanying fault by a south dipping under the Northern Qinling block during late Caledonian-early Hercynian period. This subduction of the intracontinent rifts leads to the partial melting of Late Proterozoic underplating basic rocks of lower crust and the formation of the granitoid rocks of Huichizi complex.
- Huichizi complex pluton,
- Adakitic rocks,
- lower crust,
- partial melting,
- late Caledonian-early Hercynian,
- northern Qinling

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References(62)

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