| 东天山吐哈盆地南缘二叠纪幔源岩浆杂岩：中亚地区陆壳垂向生长的地质记录 |
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| 引用本文：李锦轶,宋彪,王克卓,李亚萍,孙桂华,齐得义.2006.东天山吐哈盆地南缘二叠纪幔源岩浆杂岩：中亚地区陆壳垂向生长的地质记录[J].地球学报,27(5):424-446. |
| DOI：10.3975/cagsb.2006.05.06 |
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| 基金项目:国家科技部重要基础研究发展规划项目(编号:2001CB409810); 国家国土资源大调查专项研究(编号:DKD9902002); 国家科技攻关项目(编号:96_915_07_01) |
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| 中文摘要:吐哈盆地南缘土屋铜矿以西侵入泥盆纪火山沉积岩系的海豹滩环状杂岩体,由纯橄榄岩、含长橄榄岩、橄长岩、斜长岩、辉石橄榄岩、橄榄辉长岩、辉长岩和闪长岩等组成,其中蚀变辉长岩中的锆石SHRIMPU_Pb年龄为269.2±3.2Ma,斜长岩中的锆石SHRIMPU_Pb表面年龄为282~287Ma;侵入康古尔塔格碰撞带变形石炭系地层的恰特卡尔塔格杂岩体由蛇纹岩、含橄榄斜长岩、蚀变辉长岩和闪长岩等组成,蚀变辉长岩中的锆石SHRIMPU_Pb年龄为277.0±1.6Ma;侵入大南湖泥盆纪活动陆缘型花岗岩的基性岩墙中的锆石SHRIMPU_Pb表面年龄为271~280Ma,类似的基性岩墙还见于克孜尔卡拉萨依早石炭世花岗闪长岩和土屋铜矿北花岗闪长岩体。上述两个镁铁质—超镁铁质杂岩体不同岩石类型及侵入三个花岗质岩体的基性岩墙的岩石学和岩石化学特征,表明它们都是来自亏损地幔并受到地壳物质混染的岩浆活动的影响,属于东天山吐哈盆地南缘幔源岩浆杂岩带的一部分。结合已有区域地质资料的综合分析,提出了吐哈盆地南缘及天山—准噶尔—南蒙古地区、斋桑碰撞带及其两侧地区、环蒙古—鄂霍茨克造山带地区和中朝陆块北缘—北山南部地区二叠纪岩浆岩带的构造背景与成因机制都存在差异、但都是中亚地区地壳垂向生长的地质记录的新认识。 |
| 中文关键词:中亚地区 吐哈盆地南缘 二叠纪幔源侵入杂岩 基性岩墙 锆石SHRIMPU-Pb年龄 地壳垂向生长 |
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| Permian Mafic-Ultramafic Complexes on the Southern Margin of the Tu-Ha Basin, East Tianshan Mountains: Geological Records of Vertical Crustal Growth in Central Asia |
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| Abstract:The Haibaotan ring complexes, which lie to the west of the Tuwu copper deposit and on the southern margin of the Tu-Ha basin, intruded into Devonian volcano-sedimentary sequences and consist of dunite, plagio-peridotite, troctolite, anorthosite, pyroxene peridotite, olivine gabbro, gabbro and diorite. Zircon SHRIMP U-Pb dating of altered gabbro and anorthosite yield U-Pb apparent ages of (269.2±3.2) Ma and 282～287 Ma. The Qiatekaertag complexes intruded into Carboniferous deformed strata within the Kangguertag collision belt, and consist of serpentinite, olivine anorthosite, gabbro and diorite. Zircon SHRIMP U-Pb dating of altered gabbro yields (277.0±1.6) Ma. Basic dykes intruded into Dananhu active continental margin granite, and have zircon SHRIMP U-Pb apparent ages of 271～280 Ma. Similar basic dykes are seen in early Carboniferous granodiorite of Kezierkalasayi and granodiorite north of the Tuwu copper deposit. Petrological and geochemical characteristics of Haibaotan and Qiatakaertage complexes and basic dykes that intruded into three granitoid batholiths indicate that they are parts of the depleted mantle-derived magmatic complex belt on the southern margin of the Tu-Ha basin. Combined with available regional geological data, the authors come to the new conclusion that the Permian magmatic rocks in such regions as the southern margin of Tu-Ha basin, Tianshan-Junggar-south Mongolia, Zhaisang collision belt and its two sides, Circum-Mongolia-Ohotsk orogenic belt, and the area from the northern margin of the Sino-Korea continent to south Beishan are all records of continental vertical growth, and that they are different from each other in their tectonic settings and origin mechanics. |
| keywords:central Asia the southern margin of Tu-Ha basin Permian mantle-derived magmatic complexes basic dykes zircon SHRIMP U-Pb ages vertical crustal growth |
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