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| 桐柏-大别造山带加里东期构造热事件及其意义 | |
| 引用本文： | 杨巍然,杨坤光,刘忠明,简平.桐柏-大别造山带加里东期构造热事件及其意义[J].地学前缘,1999,6(4):247-253. |
| 作者姓名： | 杨巍然 杨坤光 刘忠明 简平 |
| 作者单位： | 1. 中国地质大学,武汉,430074 2. 湖北省地质科学研究所,武汉,430030 3. 宜昌地质矿产研究所,宜昌,433003 |
| 基金项目： | 国家自然科学基金;49572146,49772147; |
| 摘 要： | 桐柏－ 大别造山带是多旋回发展的复合造山带，至少有晋宁期、加里东期和印支期三个造山旋回。加里东旋回结束洋壳发展历史，经历了广泛的区域变质作用和局部强烈的高压超高压变质作用，具有划时代意义。桐柏－ 大别造山带加里东期具小洋盆、微古陆、多岛海古地理面貌，总体向北俯冲，最终形成陆 陆碰撞造山带。进一步可划分为三个各具特色的单元：北淮阳构造带是一个板块碰撞混杂带；中间隆起区相当于岛弧性质，但它部分地段曾一度伴随小洋盆俯冲至深处，形成高压超高压变质带；随应褶皱带为大陆裂谷性质，并具某些弧后盆地特征。它们共同构成了大陆造山带复杂的内部结构构造特征。桐柏－ 大别造山带向东被后期的郯庐断裂所截；向西与秦岭造山带相连。通过区域地质和古地磁对比，加里东期秦岭造山带开裂规模更大，蛇绿岩更发育，构成一个向西开口的喇叭形；碰撞时大别造山带先碰，然而逐渐向西迁移 |
| 关 键 词： | 桐柏-大别山 造山带 多旋回 开与合 加里东期 |
| 修稿时间： | 1998年8月31日 |
Caledonian tectono-thermal event in Tongbai -Dabie orogenic belt and its significance |
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| Yang Weiran,Yang Kunguang.Caledonian tectono-thermal event in Tongbai -Dabie orogenic belt and its significance[J].Earth Science Frontiers,1999,6(4):247-253. | |
| Authors: | Yang Weiran Yang Kunguang |
| Abstract: | The Tongbai-Dabie orogenic belt is a compound orogenic belt with a polycycle development. It experienced at least the Jinningnian, the Caledonian and the Indosinian orogenic cycles. The Caledonian cycle put an end to the developmental history of the oceanic crust. It experienced extensive regional metamorphism and locally intensive high pressure to ultra high pressure metamorphism, and this is of an epoch making significance. In Caledonian, there in the Tongbai-Dabie orogenic belt were many small oceanic basins, micro oldlands and marine with many islands and these characterized its palaeogeographic feature. As a whole, it subducted northward, and finally, there formed the continental continental collision orogenic belt. It may further be divided into three characteristic units: the Beihuaiyang tectonic belt, it is a mixed zone of plate collision; the median uplifting zone, it is of island arc in nature, but parts of it had been subducted to depth with the small oceanic basin and formed the high ultrahigh pressure metamorphic belt; the Suiying folded zone, it is roughly corresponding to the back arc basin. All of these constitute together the complex internal textural and structural characteristic of the continental orogenic belt. To the east, the Tongbai-Dabie orogenic belt is truncated by the Tanlu fault; to the west, it connects with the Qinling orogenic belt. Through the study of regional geology and the correlation of palaeomagnetism, it is found that in Caledonian, the splitting scale of Qinling orogenic belt became much larger, the development of the ophiolite suites went on much better, and it formed a trumpet form with its bell oriented toward to the west; the collision of the Dabie orogenic belt took place formerly, and then, it migrated westwards gradually. |
| Keywords: | the Tongbai-Dabie Mountains orogenic belt polycycles opening and closing Caledonian stage |
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