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| 南岭东段早侏罗世沉积岩碎屑锆石U-Pb定年及其地质意义——以东坑盆地为例 | |
| 引用本文： | 李武显,赵希林,邢光福,岑涛,陶继华.南岭东段早侏罗世沉积岩碎屑锆石U-Pb定年及其地质意义——以东坑盆地为例[J].大地构造与成矿学,2013,37(1):78-86. |
| 作者姓名： | 李武显 赵希林 邢光福 岑涛 陶继华 |
| 作者单位： | 1. 中国科学院广州地球化学研究所,同位素地球化学国家重点实验室,广东广州510640 2. 中国地质调查局南京地质矿产研究所,江苏南京,210016 3. 中国科学院广州地球化学研究所,同位素地球化学国家重点实验室,广东广州510640;中国科学院大学,北京100049 |
| 基金项目： | 国土资源大调查项目(编号:1212011085446);中国科学院广州地球化学研究所135项目(GIGCAS-135-Y234151001);国家自然科学基金(批准号:40973025、41173039)资助 |
| 摘 要： | 印支造山运动是华南早中生代最重要的构造-岩浆事件,它在很大程度上影响了华南现今的地形和地貌特点。本文研究了南岭东段赣南早侏罗世东坑火山岩盆地沉积岩的碎屑锆石U-Pb年代,获得最显著的年龄峰值为196Ma、238Ma、364Ma和427Ma,表明该沉积岩并不是外来的震旦纪-寒武纪变质岩,而是早侏罗世裂谷火山盆地的沉积物。缺乏260～290Ma的锆石年龄,很可能反映物质为近源来源。通过与闽西南晚三叠世和华南内陆中-晚二叠世沉积砂岩中碎屑锆石年龄谱对比,反映华南印支早期(290～260Ma)岩浆活动主体在东南沿海地区,晚期(240～200Ma)主体发育在内陆地区。大量印支期侵入岩锆石的出现也很可能表明华南内陆印支造山带在～190Ma已经经历了相当程度的垮塌。 |
| 关 键 词： | 碎屑锆石 东坑盆地 印支造山 南岭东段 |
Geochronology of the Detrital Zircons from Early Jurassic Sedimentary Rocks from the Dongkeng Basin and its Geological Implications |
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| LI Wuxian , ZHAO Xilin , XING Guangfu , CEN Tao , TAO Jihua.Geochronology of the Detrital Zircons from Early Jurassic Sedimentary Rocks from the Dongkeng Basin and its Geological Implications[J].Geotectonica et Metallogenia,2013,37(1):78-86. | |
| Authors: | LI Wuxian ZHAO Xilin XING Guangfu CEN Tao TAO Jihua |
| Institution: | 1,3 (1.State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China; 2.Nangjing Institute of Geology and Mineral Resources, CGS, Nanjing 210016, Jiangsu, China; 3.University of Chinese Academy of Sciences, Beijing 100049, China) |
| Abstract: | The Indosinian Orogeny is an important tectono-magmatic event in South China, it deeply influence today′s landform and geomorphology of South China. We present in this paper a study on detrital zircon U-Pb ages of the early Jurassic Dongkeng siltstone in eastern part of the Nanling Range. Four prominent age peaks, i.e. 196 Ma, 238 Ma, 364 Ma and 427 Ma are obtained, suggesting that the siltstone was deposited in Early Jurassic rather than Sinian to Cambrian. Absence of 260~290 Ma zircon ages indicates a proximal source for the sedimentary rocks. Furthermore, we compare the detrital zircon age of our results with those of the Late Triassic standstone from Wenbinshan Formation in southwestern Fujian and Middle-Late Permian sandstone in South China, conclusions can be speculated that early Indosinian magmatism (290~260 Ma) developed mainly in the coastal region of South China and the late Indosinian magmatism (240~200 Ma) occurred in South China interior. Denudation of Indosinian Orogen in South China should be considerable progressed at ca. 190 Ma due to the exposoure of Indosinian granites. |
| Keywords: | detrital zircon Dongkeng basin Indosinian Orogeny Nanling Range |
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