| 大别山东部超高太变质带北侧的花岗片麻岩及其构造背景 |
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| 引用本文： | 吴维平,徐树桐,江来利,刘贻灿,苏文,石永红,范高红,陈金苗,沈欢喜.大别山东部超高太变质带北侧的花岗片麻岩及其构造背景[J].安徽地质,1998(1). |
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| 作者姓名： | 吴维平 徐树桐 江来利 刘贻灿 苏文 石永红 范高红 陈金苗 沈欢喜 |
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| 作者单位： | 安徽省地质科学研究所，安徽省地矿局３１１地质队 |
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| 摘 要： | 大别山东部超高压变质带北侧的花岗片麻岩有下列特征。（１）化学成分富硅、富碱，一般ＳｉＯ２＜７５％，Ｋ２Ｏ＋Ｎａ２Ｏ＞８％，且Ｋ２Ｏ＞Ｎａ２Ｏ。（２）与变质表壳岩有侵入接触关系，有异源、深源包体。（３）主要为鳞片花岗变晶结构，有残留的岩浆结构，普遍具片麻状构造，钾长石常以眼球状巨晶出现，剪切带中发育Ｌ＞Ｓ型变形组构。（４）变质作用为角闪岩相，变质矿物为黑云母、角闪石以及少量石榴石、白云母、绿帘石等。。（５）锆石的乙—Ｐ６同位素年龄值为６２９Ｍａ。上述特征与超高压变质带中的含霓石变质花岗岩有明显的区别，因此，它可能是杨子大陆板块的俯冲基底。
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| 关 键 词： | 花岗片麻岩 构造背景 超高压变质带 大别山东部 |
THE GRANITIC GNEISSES AND ITS TECTONIC SETTING FROM THE NORTHERN PART OF ULTRA HIGH PRESSURE METAMORPHIC BELT IN EASTERN DABIE SHAN |
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| Wu Weiping\ Xu Shutong\ Jiang Laili\ Liu Yican\ Su Wen\ Shi Yonghong.THE GRANITIC GNEISSES AND ITS TECTONIC SETTING FROM THE NORTHERN PART OF ULTRA HIGH PRESSURE METAMORPHIC BELT IN EASTERN DABIE SHAN[J].Geology of Anhui,1998(1). |
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| Authors: | Wu Weiping\ Xu Shutong\ Jiang Laili\ Liu Yican\ Su Wen\ Shi Yonghong |
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| Abstract: | The main characteritics of the granitic gneisses from the northern Dabie Shan are as follows: (1) rich in SiO 2<75%,K 2O+Na 2O>8%,and K 2O>Na 2O. (2) intrusive conact with the metamorphic crustal rocks, contain antilogues and typhonic inclusions. (3) lepide-granoblastic texture with relic magmatic texture, gneissic structure with augen of K-feldspar and L>S type shape-fabric in shear zone. (4)amphibolite facies metamorphism. With some metamorphic mineral such as biotite, hornblende and a few garnet, muscovite, epidote,ect. (5) 629Ma (zircon U-Pb). These indicate that the granitic gneisses are different from the aegirine-bearing meta-granitoid in the ultrahigh pressure metamorphic belt. So, the former may be the underthrust basement of the Yangtze continental plate. |
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| Keywords: | granitic gneisses tectonic setting and Dabie Shan |
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