| Petrochemistry, Chronology and Tectonic Setting of Strong Peraluminous Anatectic Granitoids in Yunkai Orogenic Belt, Western Guangdong Province, China |
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| 作者姓名： | 彭松柏 金振民 刘云华 付建明 何龙清 蔡明海 王彦斌 |
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| 作者单位： | Facultyof Earth Sciences China University of Geosciences Wuhan430074 China，Yichang Institute of Geology and Mineral Resources Yichang443003 ChinaJin Zhenmin，Facultyof Earth Sciences China University of Geosciences Wuhan430074，Yichang Institute of Geology and Mineral Resources Yichang443003 China，Yichang Institute of Geology and Mineral Resources Yichang443003 China，Yichang Institute of Geology and Mineral Resources Yichang443003 China，Yichang Institute of Geology and Mineral Resources Yichang443003 China，Beijing SHRIMP Center，Institute of Geology Chinese Academy ofGeological Sciences Beijing100037 China |
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| 基金项目： | This paper is supported by the National Natural Science Foundation ofChina ( No . 40072069 )，Chinese Geological Survey Project(200313000041) . |
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| 摘 要： | INTRODUCTIONA suite of strongly deformed and metamor-phosed banded-augen (rapakivi) anatectic granitoids(charnockite) can be found at Dongzhen, Sihe ,Heshui and Baishi in Xinyi County , Changpo ,Gaozhou, Yunlu and Huanglingin Gaozhou County ,western Guangdong Province and Liuma , Tiantang-shan mountain in Luchuan County , and easternGuangxi in the Yunkai orogenic belt . Research onthe genesis and chronology of the granitoids has beenconducted by Mo et al . (1980) and Lin et al .(1…
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| 关 键 词： | 岩石化学 切向压缩力带 加里东期 广东 地质年代 |
| 收稿时间： | 2005-10-20 |
| 修稿时间： | 2005-12-24 |
Petrochemistry, Chronology and Tectonic Setting of Strong Peraluminous Anatectic Granitoids in Yunkai Orogenic Belt, Western Guangdong Province, China |
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| Peng Songbai,Jin Zhenmin,Liu Yunhua,Fu Jianming,He Longqing,Cai Minghai,Wang Yanbin.Petrochemistry, Chronology and Tectonic Setting of Strong Peraluminous Anatectic Granitoids in Yunkai Orogenic Belt, Western Guangdong Province, China[J].Journal of China University of Geosciences,2006,17(1):1-12. |
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| Authors: | Peng Songbai Jin Zhenmin Liu Yunhua Fu Jianming He Longqing Cai Minghai Wang Yanbin |
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| Institution: | 1. CRPG, UMR 7358 CNRS - Université de Lorraine, 54501 Vandoeuvre les Nancy, France;2. School of Earth Sciences, Zhejiang University, Hangzhou, China;3. Univ.Lille, CNRS, INRA, ENSCL, UMR 8207, UMET, Unité Matériaux et Transformations, F 59 000 Lille, France |
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| Abstract: | Arguments persist on the genesis and ages for the banded-angen (rapakivi) anatectic granitoids (charnockite)extensively outcropped in the Yunkai(云开)region, western Guangdong(广东)Province.Their petrochemistry,SHRIMP dating,deformational and metamorphic structure were studied. The results show that most granitoids are A/CNK＞1.1,CaO/Na2O=0.62-1.61(average 0.94＞0.3), Al2O3/TiO2 =16.6-60.6 (average 23.68),depleted high field strong elements Ta, Nb,Zr, strong peraluminous high-K calcalkaline and calcalkaline granitoids in the post-collisional tectonic environment of a subduction-collision orogenic belt in an active-continental margin. The temperatures of charnockite and gneissic garnet-bearing biotite monzonitic granite are obviously higher than those of banded-augen(rapakivi)biotite monzonitic granite, and charnockite and gneissic garnet-bearing biotite monzonitic granite with the evolutional characteristics of A-type granites. The forming ages from banded-augen (rapakivi) biotite monzonitic granite to charnockite and gneissic garnet-bearing biotite monzonitic granite, whose crystallizing zircon SHRIMP ages are (465±10) Ma,(467±10)Ma,(435±11)Ma and (413±8) Ma, respectively, become younger. This shows that there was an oceanic continental subduction-collision and post-collisional extension-delamination-underplating between the Yangtze and Cathaysia plates during the Caledonian, and the granitoids experienced compressional uplift and extensional exhumation during the Indosinian. This provides important evidence of subduction collision of the Yangtze plate to the Cathaysia plate during the Caledonian in South China. |
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| Keywords: | Yunkai orogenic belt Caledonian strong peraluminous anatectic granitoids post- collisional tectonic environment extension-delamination-underplating |
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