| 苏北连云港地区蓝闪绿片岩相岩块的发现 |
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| 引用本文： | 邱海峻,许志琴,张建新,杨经绥,张泽明,李海兵.苏北连云港地区蓝闪绿片岩相岩块的发现[J].岩石矿物学杂志,2003,22(1):34-40. |
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| 作者姓名： | 邱海峻 许志琴 张建新 杨经绥 张泽明 李海兵 |
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| 作者单位： | 1. 吉林大学,地球科学学院,吉林,长春,130026;中国地质科学院,地质研究所,北京,100037
2. 中国地质科学院,地质研究所,北京,100037 |
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| 基金项目： | 国家“九五”重大科学工程——中国大陆科学钻探工程项目资助 |
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| 摘 要： | 在苏北连云港地区(红石咀、东西连岛及蟹脐沟)发现以岩块、岩片形式出现的蓝闪绿片岩相岩石，其由石榴石、蓝透闪石、冻蓝闪石、阳起石、钠长石、多硅白云母、榍石及文石等矿物组成。石榴石变斑晶作为低扩散的刚性矿物，经历了多期变质变形作用，变质反应证据保存在石榴石的成分环带及包体矿物组合中。蓝透闪石、冻蓝闪石及文石包体的存在表明，本区出露的绿片岩相岩系属早期经历低温高压变质作用、晚期又叠加绿片岩相变质作用的高压变质地体。这一发现为苏鲁高压地体的构造单元划分提供了重要依据。
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| 关 键 词： | 高压变质带 蓝闪绿片岩相 蓝透闪石 冻蓝闪石 连云港 苏北 |
| 文章编号： | 1000-6524(2003)01-0034-07 |
| 修稿时间： | 2002年8月1日 |
The discovery of glaucophane greenschist facies rock mass in Lianyungang, northern Jiangsu |
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| QIU Hai_jun,XU Zhi_qin,ZHANG Jian_xin,YANG Jing_sui,ZHANG Ze_ming and LI Haibing.The discovery of glaucophane greenschist facies rock mass in Lianyungang, northern Jiangsu[J].Acta Petrologica Et Mineralogica,2003,22(1):34-40. |
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| Authors: | QIU Hai_jun XU Zhi_qin ZHANG Jian_xin YANG Jing_sui ZHANG Ze_ming and LI Haibing |
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| Institution: | QIU Hai_jun 1,2,XU Zhi_qin 2,ZHANG Jian_xin 2,YANG Jing_sui 2,ZHANG Ze_ming 2 and LI Haibing 2 |
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| Abstract: | The Sulu high_pressure (HP) metamorphic belt lies on the southeastern margin of the Sulu ultrahigh_pressure (UHP) metamorphic belt in northern Jiangsu. Its outcrops consist mainly of greenschist_facies rocks of the Meso_ to Neoproterozoic Yuntai Group_complex. Nevertheless, typical blueschist was only found in the drilling cores from Yangji Town of Guanyun County in northern Jiangsu. The glaucophane greenschist facies rocks discovered in such places of Lianyungang area as Hongshizui, Dongxiliandao and Xieqigou consist of winchite, barroisite, actinolite, albite, phengite, sphene, aragonite, etc. These garnets as a kind of low_diffuse rigid mineral have undergone multi_stage deformation and metamorphism. The evidence of the metamorphism is preserved in the compositional zoning of garnet. These minerals indicate that the outcrops in the study area are part of a HP terrane which was overprinted by greenschist facies metamorphism at the late stage. This discovery provides important evidence for dividing geotectonic units in the Sulu high_pressure terrane. |
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| Keywords: | high_pressure metamorphic belt glaucophane greenschist facies winchite barroisite Lianyungang northern Jiangsu |
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