| 西南极乔治王岛菲尔德斯半岛火山岩同位素年代及地层对比 |
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| 引用本文： | 朱铭,鄂莫岚,刘小汉,郑祥身.西南极乔治王岛菲尔德斯半岛火山岩同位素年代及地层对比[J].极地研究,1991,3(2):126-135. |
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| 作者姓名： | 朱铭 鄂莫岚 刘小汉 郑祥身 |
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| 作者单位： | 中国科学院地质研究所，中国科学院地质研究所，中国科学院地质研究所，中国科学院地质研究所 北京 100029，北京 100029，北京 100029，北京 100029 |
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| 摘 要： | 以K-Ar,(39)~Ar-(40)~Ar和Rb-Sr法对菲尔德斯半岛的火山岩进行了同位素测年。实验结果表明,半岛的火山作用从晚古新世开始,可能一直延续至中中新世的早期。其间,碧玉山段的岩石分别以Rb-Sr和(39)~Ar-(40)~Ar法测定了形成年龄,年龄值为54Ma和55Ma,属于晚古新世;岛上广泛分布的玛瑙滩段熔岩的K-Ar年龄区间为45～50Ma,为早始新世;化石山段从中始新世到渐新世;而最晚形成的岩块山段的时代为中中新世的早期。这些数据,与地质和古生物证据一起,对了解该区地层的相互关系和讨论火山作用提出了正确的认识。
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| 关 键 词： | 西南极 菲尔德斯半岛 同位素年龄 地层对比 |
THE ISOTOPE AGE OF THE VOLCANIC ROCKS AND THE CORRELATION OF STRATIGRAPHY IN THE FILDES PENINSULA, KING GEORGE ISLAND, WEST ANTARCTICA |
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| Zhu Ming E Molan Liu Xiaohan and Zheng Xiangshen.THE ISOTOPE AGE OF THE VOLCANIC ROCKS AND THE CORRELATION OF STRATIGRAPHY IN THE FILDES PENINSULA, KING GEORGE ISLAND, WEST ANTARCTICA[J].Chinese Journal of Polar Research,1991,3(2):126-135. |
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| Authors: | Zhu Ming E Molan Liu Xiaohan and Zheng Xiangshen |
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| Abstract: | The ages of volcanic rocks from the Fildes Peninsula, King George Island, West Antarctica have been determined with K-Ar, 39Ar-40Ar, Rb-Sr methods by authors. The results show that:
a. the age range of the volcanism in the Fildes Peninsula is from Later Paleocene to Early Mid-Miocene;
b. the forming time of the volcanic rocks of Jasper Hill Member belonges to Later Paleocene because of the isotope ages being 54Ma and 55Ma determined with Rb-Sr and 39Ar - 40Ar, respectively;
c. the volcanic rocks of Agate Beach Member are the products of the volcanic activities during Early Eocene period according to the isochron of K-Ar method (45-50 Ma);
d. the geological age for Fossil Hill Member is about from Mid - Eocene to Early Oligocene, and
e. the time formed the Block Hill Member lasts Early Mid - Miocene, probabley. These data combining with the geological and palaeozoological evidences have
presented strong support for best understanduing the correlation of the stratigraphy and, discussing the volcanism in studied area. |
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| Keywords: | Fildes Peninsula isotope age correlation of stratigraphy |
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