| 海南岛北西部前寒武纪花岗质岩SHRIMP锆石U-Pb年龄及地质意义 |
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| 引用本文： | 许德如,夏斌,李鹏春,张玉泉,陈广浩,马驰.海南岛北西部前寒武纪花岗质岩SHRIMP锆石U-Pb年龄及地质意义[J].大地构造与成矿学,2006,30(4):510-518. |
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| 作者姓名： | 许德如 夏斌 李鹏春 张玉泉 陈广浩 马驰 |
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| 作者单位： | 1. 中国科学院广州地球化学研究所,中国科学院边缘海地质重点实验室,广东,广州,510640
2. 中国科学院广州地球化学研究所,中国科学院边缘海地质重点实验室,广东,广州,510640;中国科学院研究生院,北京,100039 |
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| 基金项目： | 国家自然科学基金，中国科学院广州地理研究所科研基金 |
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| 摘 要： | 对海南岛北西部戈枕地区侵位于古中元古代抱板群花岗质岩进行了CL成像制约下的SHRIMP锆石U-Pb年龄测定,获得了1455±12Ma的U-Pb谐和年龄、1454±12Ma有利的207Pb/206Pb中值年龄。结合该花岗质岩锆石内部结构、岩浆源区和变形变质特征,以及前人多种定年成果,认为该花岗质岩结晶年龄应为~1450Ma,随后于~1400Ma经历了一次构造-热变质事件;Rodinia超大陆聚合前,华夏地块(包括海南岛、或至少是海南岛北西部)最可能位于劳伦大陆南缘的西南延伸部分。研究结果还暗示华夏地块(包括海南岛)所经历的格林威尔造山事件可能较扬子地块偏早,古、中元古代抱板群沉积上限应约束在~1450Ma。
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| 关 键 词： | 花岗质岩 SHRIMP锆石U-Pb年龄 海南岛北西部 劳伦大陆 |
| 文章编号： | 1001-1552(2006)04-0510-09 |
| 收稿时间： | 2006-03-01 |
| 修稿时间： | 2006-05-08 |
SHRIMP U-PB DATING OF ZIRCON FROM THE PRECAMBRIAN GRANITOIDS IN NORTHWEST HAINAN ISLAND AND ITS GEOLOGICAL IMPLICATIONS |
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| XU Deru,XIA Bin,LI Pengchun,ZHANG Yuquan,CHEN Guanghao,MA Chi.SHRIMP U-PB DATING OF ZIRCON FROM THE PRECAMBRIAN GRANITOIDS IN NORTHWEST HAINAN ISLAND AND ITS GEOLOGICAL IMPLICATIONS[J].Geotectonica et Metallogenia,2006,30(4):510-518. |
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| Authors: | XU Deru XIA Bin LI Pengchun ZHANG Yuquan CHEN Guanghao MA Chi |
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| Abstract: | The Precambrian granitoid pluton emplaced in the Paleoproterozoic-Mesoproterozoic Baoban Group in Gezhen area, northwest Hainan Island, south China was dated by SHRIMP U-Pb analysis assisted by CL image. Zircon from the pluton yields a concordant SHRIMP U-Pb age of 1455±12Ma with a weighted mean 207 Pb/ 206 Pb age of 1454±12Ma, indicating its emplacement at ~1450Ma. In connection with the zircon internal structure, the structural deformation/metamorphism and the provenance of the pluton, as well as the previously published age data by different dating methods, we suggest that a tectono-thermal metamorphic event most likely took place at ~1400 Ma, and thus the minimum depositional age for the Baoban Group should be ca. ~1450 Ma. Cathaysian Block (including Hainan Island, at least its northwest part) could be regarded as a southwestward extension of southern Laurentia before the assembly of the Mesoproterozoick-Neoproterozoic Rodinia supercontinent. Our research results also imply that Cathaysian Block (including Hainan Island) probably underwent an earlier Grenville orogeny event, in comparison with Yangtze Block. |
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| Keywords: | Precambrian granitoid SHRIMP zircon U-Pb dating Northwest Hainan Island Laurentia Continent |
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