浙江舟山群岛首次发现二叠纪变质岩
The first discovery of Permian metamorphic rocks in Zhoushan Islands, Zhejiang Province
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摘要: 浙江舟山群岛大衢岛及周边若干小岛出露少量变质岩系，包括斜长角闪岩、片麻岩、片岩、大理岩等，以往被归为陈蔡岩群。LAICP-MS锆石U-Pb测年结果表明，黑云斜长片麻岩变质新生锆石或岩浆锆石的变质边年龄在260～270Ma之间，大理岩的变质年龄为261.1±1.3Ma，侵入变质岩的未变形伟晶岩脉年龄为258.0±1.6Ma，表明该套变质岩系的变质时代约为260Ma，不能归入加里东期变质的陈蔡岩群。这是在华南东北缘地区首次发现二叠纪变质岩，为探讨华南东吴运动和全球海西运动，甚至泛大陆的重建提供了重要新信息。Abstract: There are some metaphoric rocks such as amphibolite, genesis, schist and marble exposed in Daqu Island of Zhoushan Is-lands, Zhejiang Province. In the past, they are assigned to Chencai Formation. Nevertheless, new LA-ICP-MS zircon U-Pb analysis yielded the ages of metamorphic neogenic zircon and metamorphic rim in biotite-plagioclase gneiss ranging from 260Ma to 270Ma, whereas the metamorphic age of marble and the formation age of undeformed pegmatite veins which intruded into metamorphic rocks are 261.1±1.3Ma and 258.0±1.6Ma respectively, indicating that the metamorphic age of the rocks in Daqu Island is~260Ma. This is the first reported Permian metamorphic rock on the northeastern margin of South China Block, which may provide some im-portant new information for Dongwu movement in South China, global Hercynian movement and even the Pangaea reconstruction.
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Key words:
- metamorphic rocks /
- Permian /
- LA-ICP-MS zircon U-Pb age /
- Zhoushan Islands
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