| 中国天山花岗岩类的时空分布及构造意义 |
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| 引用本文： | 刘成德,邬继易,吕喜朝,张经国,王作勋.中国天山花岗岩类的时空分布及构造意义[J].新疆地质,1989(2). |
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| 作者姓名： | 刘成德 邬继易 吕喜朝 张经国 王作勋 |
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| 作者单位： | 新疆维吾尔自治区地质矿产局第一区调大队
(刘成德，邬继易，吕喜朝，张经国)，中国地质科学院地质研究所(王作勋) |
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| 摘 要： | 天山花岗岩类具明显的时空分带特征,以古生代最为明显.它们可分为:1.中天山南缘中加里东期花岗岩带:2.中天山北缘晚加里东期花岗岩带;3.中天山南缘早华力西期花岗岩带;4.中天山北缘中华力西期花岗岩带;5.马宗山南缘晚华力西期花岗岩带;6.南天山南坡晚华力西期花岗岩带.在时空上,花岗岩类在中天山陆壳南、北缘呈交替分布的格局,显示出与天山陆壳南、北张合呼应、交替演化的和谐一致关系.中天山花岗岩类是几个地槽主旋回的产物.天山花岗岩带与蛇绿岩带成“对”分布,沿“中天山南缘深断裂”,及“中国天山主干断裂”两侧延伸,二者互相平行.天山花岗岩类是多成因的.分为洋壳重熔型、陆壳重熔型及洋壳陆壳混合重熔型花岗岩.
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| 关 键 词： | 花岗岩类的时空分带特征 陆壳拉张分裂及挤压闭合运动 多旋回板块运动 花岗岩类交替分布格局 洋壳重熔型 陆壳重熔型 洋壳、陆壳混合重熔型 |
THE SPACE-TIME DISTRIBUTION AND TECTONIC SIGNIFICANCE OF GRANITES IN TIANSHAN, CHINA |
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| Liu Chengde Wu Jiyi Wang Zuoxun,Lu Xichao Zhang Jingguo.THE SPACE-TIME DISTRIBUTION AND TECTONIC SIGNIFICANCE OF GRANITES IN TIANSHAN, CHINA[J].Xinjiang Geology,1989(2). |
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| Authors: | Liu Chengde Wu Jiyi Wang Zuoxun Lu Xichao Zhang Jingguo |
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| Abstract: | In the Tianshan area, the granitoid displays clearly zoning characteristics in time and the space, and in particular in the paleozoic. They may be divided into the
following: 1. The middle Caledonian granite belt of southern margin of the Middle-Tianshan.
2. The late Caledonian granite belt of northern margin of the Middle-Tianshan.
3. The early Variscian granite belt of southern margin of the Middle-Tianshan.
4. The middle Variscian granite belt of northern margin of the Middle-Tianshan.
5. The late Variscian granite belt of southern margin of Mazongshan.
6. The late Variscian granite belt of southern slope of the Southern Tianshan. The Variscian granitoid composes the main part of Tianshan granites. They are
concentrated in the southern and northern margins of Middle-Tianshan, It suggestes the direct relationship with the tensional and compressional motion of the eugeosync-line and miogeosyncline of Variscian.
In time and space,the granitoid display a pattern of alternats distribution corresponding it's harmonic relationship with the evolution of alternative tensional-com-pressional motion in southern and northern margins of the Tianshan continental crust. The granites of the MiJdle-Tianshan were products of the principal cycles of several eugeosyncline. The granitic magmatism evolutated from slanting basic to acid, acid-alkaline and slanting alkaline, and of migraed in the time and the space from the margin to the innerpart continental crust, from the geosynclinal early cycle to the late cycle.
The granitic belts and the ophiolitic suites are dispersion in pairs, and parallel to each other . stretch along the deep fault of southern margin of the Middle-Tianshan and the Chinese Tianshan main fault. The ophiolitic suite fromed in the rift valley of the continental crust tensional. The granitic belt formed in the stage of the rift valley compressional motion. The granitic belts and the ophiolitic suites were products of polycycline motion of the Tianshan plate. The tension-type granitoid and the compression-type granites were formed by tensional and compressional motion of the Tianshan. From the thinning, of continental crust via aulacogene to the formation of oceanic crust, the igneous rocks appear the volcanic and intrusive rocks series and the basic-ultrabasic rocks and plagioclas granite scries. It reflectes the characteristics of magmatism in the process from the early tensional stage to formation of the new oceanic crust.The compression-type had formed in the compressional stage of contnental crust. This kind of granite is principal in the Tianshan.
The Tianshan granitoid is of multi-genesis. Before late Caledonian, it is mainly metasomatic and anatexis later on.According to the origin and genetic depth of the graniteid anatexis may be divided into the oceanic crust-type, the continental crust-type, the oceanic and continental crust mixed anatexis-type granites.They are charaeterized by different ratio of Sr87/Sr86. |
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| Keywords: | the granitoid zoning characteristics in space and time the tensional and compressionsl motion of continental crust polycyeline plate motion the granitoid display a pattern of alternate distribution the oceanic crust anatexis-type the conti |
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