云开造山带强过铝深熔花岗岩地球化学、年代学及构造背景

彭松柏; 金振民; 刘云华; 付建明; 何龙清; 蔡明海; 王彦斌

Volume 31 Issue 1

Jan. 2006

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Article Navigation > Earth Science > 2006 > 31(1): 110-120

PENG Song-bo, JIN Zhen-min, LIU Yun-hua, FU Jian-ming, HE Long-qing, CAI Ming-hai, WANG Yan-bin, 2006. Petrochemistry, Chronology and Tectonic Setting of Strong Peraluminous Anatectic Oanitoids in Yunkai Orogenic Belt, Western Guangdong Province, China. Earth Science, 31(1): 110-120.

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Petrochemistry, Chronology and Tectonic Setting of Strong Peraluminous Anatectic Oanitoids in Yunkai Orogenic Belt, Western Guangdong Province, China

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Yichang Institute of Greology and Mineral Resources, Yichang 443003, China
3.
Beijing SHRIMP Center, Institute of Geology. CAGS, Beijing 100037, Chrina

Received Date: 2005-07-15
Publish Date: 2006-01-25

Abstract

Abstract

There are different theories about the genesis and age of banded-augen (rapakivi) anatectic granitoids (charnock-ite), which outcrop extensively in Yunkai region, western Guangdong Province. Their petrochemistry, chronology, defor-mational and metamorphic structures were studied. The petrochemical features of most granitoids are: A/CNK > 1. 1, Cao/Na₂O=0. 62 - 1. 61 (average 0. 94, > 0.3), Al₂O₃/TiO=16.6-60.6 (average 23. 68), loss high field strong elements Ta、Nb、Zr, strong peraluminous high-K calc-alkaline and calc-alkaline granitoids in a post-collisional tectonic enviroment of sub-duction-collision orogenic belt in an active-continental margin. The temperatures of charnockite and gneissic garnet-bearing biotite monzonitic granite are obviously higher than that of banded-augen (rapakivi) biotite monzonitic granite, and charnockite and gneissic garnet-bearing biotite monzonitic granite with the evolutional characterics of A-type granites. From banded-granite, augen (rapakivi) biotite monzonitic granite to charnockite and gneissic garnet-bearing biotite monzonitic granite, the forming ages are (465±10)Ma, (467±10)Ma, (435±11)Ma and (413±8)Ma respectively, and become younger. These results show that there were oceanic-continental subduction-collision and post-collisional extension-delamination-underplating between the Yangtze and Cathaysia plates during the Caledonian, and they experienced compressional uplift and extensional exhumation during the Indosinian. It provides important evidence of the oceanic-continental subduction-collision of the Yangtze plate downward to the Cathaysia plate during the Caledonian in South China.
- Yunkai orogenic belt,
- Caledonian,
- strong peraluminous anatectic granitoids,
- post-collisional tectonic enviro-ment,
- extension-delamination-underplating.

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Petrochemistry, Chronology and Tectonic Setting of Strong Peraluminous Anatectic Oanitoids in Yunkai Orogenic Belt, Western Guangdong Province, China

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