| 北秦岭宽坪岩群的解体及新元古代N-MORB |
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| 引用本文： | 第五春荣,孙勇,刘良,张成立,王洪亮. 北秦岭宽坪岩群的解体及新元古代N-MORB[J]. 岩石学报, 2010, 26(7): 2025-2038 |
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| 作者姓名： | 第五春荣 孙勇 刘良 张成立 王洪亮 |
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| 作者单位： | 大陆动力学国家重点实验室,西北大学地质学系,西安710069 |
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| 基金项目： | 国家自然科学基金项目（40773044、40902056）、国家“973”项目(2009CB825003)及西北大学大陆动力学国家重点实验室科技部专项 |
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| 摘 要： | 本文通过LA-ICPMS单颗粒锆石微区U-Pb测年方法研究,确定宽坪岩群中的变基性火山岩形成年龄为943Ma,宽坪岩群中的变质沉积岩原岩形成于小于600Ma。因此,本文提出宽坪岩群从地层学意义上应予废除或解体。即宽坪岩群中变沉积岩与变基性火山岩不属于一个延续的沉积层序,是晚期构造运动将这些形成于不同时代、不同构造环境的岩石单元混杂叠置在一起。宽坪岩群中绿片岩类具有典型N-MORB的特征,属于新元古代一套蛇绿岩残片,代表格林威尔造山期的地质记录。
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| 关 键 词： | 北秦岭造山带；宽坪岩群；绿片岩；锆石；格林威尔造山 |
| 收稿时间： | 2010-04-05 |
| 修稿时间： | 2010-06-11 |
The disintegration of Kuanping Group in North Qinling orogenic belts and Neo-proterozoic N-MORB |
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| DIWU ChunRong,SUN Yong,LIU Liang,ZHANG ChengLi and WANG HongLiang. The disintegration of Kuanping Group in North Qinling orogenic belts and Neo-proterozoic N-MORB[J]. Acta Petrologica Sinica, 2010, 26(7): 2025-2038 |
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| Authors: | DIWU ChunRong SUN Yong LIU Liang ZHANG ChengLi WANG HongLiang |
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| Affiliation: | State Key Laboratory of Continental Dynamics, Department of Geology, Northwestern University, Xi'an 710069, China;State Key Laboratory of Continental Dynamics, Department of Geology, Northwestern University, Xi'an 710069, China;State Key Laboratory of Continental Dynamics, Department of Geology, Northwestern University, Xi'an 710069, China;State Key Laboratory of Continental Dynamics, Department of Geology, Northwestern University, Xi'an 710069, China;State Key Laboratory of Continental Dynamics, Department of Geology, Northwestern University, Xi'an 710069, China |
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| Abstract: | Kuangping Group located in North Qinling orogenic belt which consists chiefly of metabasalts and meta-sedimentary. A new LA-ICPMS zircon U-Pb age of metabasalt of Kuanping Group is presented and gives a weighted mean 207Pb/206PbPb age of 943Ma which in the Neo-proterozoic time. However, the meta-sedimentary of Kuanping Group is limited to that in Early Phanerozoic time, but the Proterozoic, as previously considered. Therefore, this indicate that the two types of rock is not a continuous stratigraphic unit, protoliths of metabasalts were tholeiitic basalts with N-MORB geochemical characteristics, which represents a dismembered ophiolite and indicate a remnants of Greenville orogeny in the North Qinling orogenic belts. |
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| Keywords: | North Qinling orogenic belt Kuangping Group Greenschists Zircon Grenville orogeny |
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