| 新疆南天山奥图拉托格拉克一带前震旦系基底地质特征 |
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| 引用本文： | 冯新昌,董富荣,李嵩龄.新疆南天山奥图拉托格拉克一带前震旦系基底地质特征[J].新疆地质,1998(2). |
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| 作者姓名： | 冯新昌 董富荣 李嵩龄 |
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| 作者单位： | 新疆地质矿产勘查开发局第一区域地质调查大队!乌鲁木齐830011 |
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| 摘 要： | 1994年在新疆南天山地区奥图拉托格拉克一带 ,首次发现了晚太古代、元古宙结晶基底。晚太古代变质岩主要由变质深成岩组成 ,表壳岩组合为沙窝大沟岩组 ,岩性为一套变质火山—沉积岩。阜平期变侵入岩为巴什托格拉克片麻杂岩 ,为一套无序的 TTG岩系。五台期变侵入岩为沙窝布拉克片麻岩套。为一套基本有序的变侵入岩系列 ,包括 TTG和二长花岗岩两个岩系。三者组成太古宙古陆核。下元古界奥图拉托格拉克岩群为一套无序变质火山—沉积岩系 ,具有古老沟弧盆体系特征 ,阿牙克托格拉克岩组原岩为古蛇绿岩组合 ,具洋脊玄武岩特征 ;克孜拉格岩组原岩为杂砂岩 ,属盆地沉积 ;卡拉格兹岩组原岩为岛弧火山岩。长城系乱滩布拉克组由一套变火山岩、火山碎屑岩组成 ,属岛弧或活动陆缘沉积 ;卫东庄组为一变质碎屑岩建造 ,具弧盆碎屑岩沉积特征。长城纪末侵入了多岛滩超单元花岗岩
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| 关 键 词： | 南天山 奥图拉托格拉克 基底地质 Sm-Nd等时线 |
GEOLOGICAL FEATURE OF PRE-SINIAN BASEMENT ALONG AOTULATOGRAK OF SOUTH TIANSHAN,XINJIANG |
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| Feng Xinchang,Dong Furong,L i Songling.GEOLOGICAL FEATURE OF PRE-SINIAN BASEMENT ALONG AOTULATOGRAK OF SOUTH TIANSHAN,XINJIANG[J].Xinjiang Geology,1998(2). |
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| Authors: | Feng Xinchang Dong Furong L i Songling |
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| Abstract: | The late Archeozoic and Proterozoic crystalline basement was discovered for the first time in 1994 along Aotulatograk of South Tianshan of Xinjiang. The late Archeozoic metamorphics are composed of metamorphosed plutonics.The supercrustal Shawodagou rock formation consists of metamorphosed volcanics - sedimentary rocks.Fupinian meta- intrusives are Bashtograk gneissic complexes of disordered TTG rock se- ries. The meta- intrusives of Wutai stage are Shawobulak gneissic rock suite basically in order,including TTG and adamellite rock series.The above- mentioned three parts form the paleo- continental necleus of the Archeozoic.The Lower Proterozoic Aotutograk rock group consists of disordered metamorphosed volcanics- sedimentary rocks with characteristics of ancient trench- arc- basin system. Ayaktograk rock formation whose mother rocks are paleo- ophiolites owns characteristics of oceanic- ridge basalts.Kezlag rock formation whose mother rocks are greywacke is basinal deposit.Karakez rock formation's protolith is island arc volcanics. L antanbulake Formation of Changcheng System is composed of meta- volcanics and volcaniclastics which be- long to island arc or active continental margin deposits.Weidongzhuang Formation is of meta- clastics with characteristics of arc- basin clastics.At the end of Changcheng age granites of Duodaotan superunit were in- truded. |
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| Keywords: | South Tianshan Aotulatograk basement geology Sm- Nd isochron |
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