| 大别山石马地区超高压变质岩角闪岩相变形的Rb-Sr同位素年龄及其构造意义 |
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| 引用本文： | 江来利,徐树桐,刘贻灿,吴维平,石永红,苏文.大别山石马地区超高压变质岩角闪岩相变形的Rb-Sr同位素年龄及其构造意义[J].安徽地质,2000(2). |
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| 作者姓名： | 江来利 徐树桐 刘贻灿 吴维平 石永红 苏文 |
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| 作者单位： | 安徽省地质调查院!安徽合肥230001 |
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| 摘 要： | 角闪岩相变形是大别山超高压变质岩的主期变形 ,露头和显微尺度的构造要素主要由这期变形产生 ,通过对超高压变质岩带内韧性剪切带中花岗片麻岩的Rb -Sr同位素年龄测定 ,获得一条变形花岗片麻岩的全岩 -白云母内部等时线年龄 ,表明超高压变质岩的角闪岩相变形产生于180Ma左右 ,超高压变质岩的主期变形确实为同角闪岩相变质期变形 ,该年龄与超高压变质岩的第二次快速冷却年龄一致 ,由此证实超高压变质岩在180Ma左右快速从下地壳折返至中地壳
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| 关 键 词： | Rb-Sr同位素年龄 角闪岩相变形 超高压变质岩 大别山 |
THE Rb-Sr ISOTOPIC AGE FOR THE AMPHIBOLITE FACIES DEFORMATIONOF THE ULTRAHIGH PRESSURE METAMORPHIC ROCKS IN SHIMA VILLAGE,EASTERN DABIE MOUNTAINS AND ITS TECTONIC IMPLICATIONS |
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| JIANG Lai li,XU Shu tong,LIU Yi can,WU Wei ping,SHI Yong hong,SU Wen.THE Rb-Sr ISOTOPIC AGE FOR THE AMPHIBOLITE FACIES DEFORMATIONOF THE ULTRAHIGH PRESSURE METAMORPHIC ROCKS IN SHIMA VILLAGE,EASTERN DABIE MOUNTAINS AND ITS TECTONIC IMPLICATIONS[J].Geology of Anhui,2000(2). |
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| Authors: | JIANG Lai li XU Shu tong LIU Yi can WU Wei ping SHI Yong hong SU Wen |
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| Abstract: | The amphibolite facies deformation dominates in the deformation of the ultrahigh pressure metamorphic(UHPM) rocks in the Dabie Mountains,by which the structural elements both in mecroscopic and microscopic scales were mainly produced Rb-Sr dating of the granitic gneiss in a ductile shear zone of the UHPM rocks belt leads to a whole rock muscovite isochronic age for the deformed granitic gneiss,indicating that the amphibolite facies deformation developed at around 180Ma and that the major phase of deformation of the UHPM rocks is indeed synchronous with the amphibolite facies metamorphism The age is consistent with the second quick cooling ages of the UHPM rocks,confirming that the UHPM rocks quickly exhumed from the lower crust to the middle crust at around 180Ma |
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| Keywords: | Rb Sr isotopic age amphibolite facies deformation ultrahigh pressure metamorphic rocks Dabie Mountains |
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