| Geology of the Grove Mountains in East Antarctica——New evidence for the final suture of Gondwana Land |
| |
| 引用本文： | 刘小汉,赵越,刘晓春,俞良军.Geology of the Grove Mountains in East Antarctica——New evidence for the final suture of Gondwana Land[J].中国科学D辑(英文版),2003,46(4). |
| |
| 作者姓名： | 刘小汉 赵越 刘晓春 俞良军 |
| |
| 作者单位： | Laboratory of Lithosphere Tectonic Evolution，Institute of Geology and Geophysics，Chinese Academy of Sciences，Institute of Geomechanics，Chinese Academy of Geological Sciences，Institute of Geomechanics，Chinese Academy of Geological Sciences，Laboratory of Lithosphere Tectonic Evolution，Institute of Geology and Geophysics，Chinese Academy of Sciences Beijing 100029，China，Beijing 100081，China，Beijing 100081，China，Beijing 100029，China |
| |
| 基金项目： | 中国科学院资助项目，科技部资助项目 |
| |
| 摘 要： | As the core block of the East Gondwana Land, the East Antarctic Shield was traditionally thought, before 1992, as an amalgamation of a number of Archaean-Paleoproterozoic nuclei, be-ing welded by Grenville aged mobile belts during 1400—900 Ma, while the …
|
Geology of the Grove Mountains in East Antarctica--New evidence for the final suture of Gondwana Land |
| |
| LIU Xiaohan.Geology of the Grove Mountains in East Antarctica--New evidence for the final suture of Gondwana Land[J].Science in China(Earth Sciences),2003,46(4). |
| |
| Authors: | LIU Xiaohan |
| |
| Abstract: | Grove Mountains consists mainly of a series of high-grade (upper amphibolite to granulite facies) metamorphic rocks, including felsic granulite, granitic gneiss, mafic granulite lenses and charnockite, intruded by late tectonic gneissic granite and post-tectonic granodioritic veins. Geochemical analysis demonstrates that the charnockite, granitic gneiss and granite belonged to aluminous A type plutonic rocks, whereas the felsic and mafic granulite were from supracrustal materials as island-arc, oceanic island and middle oceanic ridge basalt. A few high-strained shear zones disperse in regional stable sub-horizontal foliated metamorphic rocks. Three generations of ductile deformation were identified, in which D1 is related to the event before Pan-African age, D2 corresponds to the regional granulite peak metamorphism, whereas D3 reflects ductile extension in late Pan-African orogenic period. The metamorphic reactions from granitic gneiss indicate a single granulite facies event, but 3 steps from mafic granulite, with P-T condition of M1 800℃, 9.3×105 Pa; M2 800-810℃, 6.4×105 Pa ; and M3 650℃ have been recognized. The U-Pb age data from representative granitic gneiss indicate (529±14) Ma of peak metamorphism, (534±5) Ma of granite emplacement, and (501±7) Ma of post-tectonic granodioritic veins. All these evidences suggest that a huge Pan-African aged mobile belt exists in the East Antarctic Shield extending from Prydz Bay via Grove Mountains to the southern Prince Charles Mountains. This orogenic belt could be the final suture during the Gondwana Land assemblage. |
| |
| Keywords: | East Antarctic Shield Grove Mountains Pan-African orogen Gondwana Land final suture |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
