干旱区生态环境知识资源中心(Arid): 苏北盆地新生代玄武岩中的地幔橄榄岩包体

Arid

	苏北盆地新生代玄武岩中的地幔橄榄岩包体
其他题名	PERIDOTITIC XENOLITHS IN THE CENOZOIC BASALTS FROM THE SUBEI BASIN
	刘建宏 1; 闫峻 2
ISSN	1001-6872
出版年	2007
卷号	27 期号:2 页码:39-46
中文摘要	苏北盆地盘石山和方山新生代玄武岩中广泛发育橄榄岩包体,以尖晶石二辉橄榄岩为主,少数为尖晶石方辉橄榄岩.盘石山橄榄岩的岩相学特征表明其经历过Ol+Cpx+Melt=Ol+Opx+Melt的反应过程,而方山橄榄岩的这种反应过程不明显,表明古老的岩石圈地幔物质在方山下部仍有残留.与华北地块东部早古生代地幔橄榄岩相比较,本地区橄榄岩包体中橄榄石的Fo值为0.89～0.90,斜方辉石的En值为0.88～0.90,表现为饱满玄武质组分的特点,表明从早古生代至新生代期间经历了岩石圈的减薄和岩石圈地幔的置换.平衡温压估算结果表明,方山橄榄岩平衡温度为985℃～1 081℃,平衡压力为1.65 Gpa～2.61 Gpa,对应的深度为53 km～84 km盘石山橄榄岩平衡温度为940℃～1 010℃,平衡压力为0.90 Gpa～2.07 Gpa,对应的深度为29 km～66 km.盘石山橄榄岩包体的起源深度小于方山,苏北盆地新生代时期岩石圈地幔的厚度约为50 km,位于岩石圈30 km～80 km之间.
英文摘要	Peridotitic xenoliths in the Cenozoic basalts from Panshishan and Fangshan in Subei basin are mainly spinel lherzolite with minor spinel harzburgite. Petrographic observation for the peridotitic xenoliths from Panshishan shows that they might undergo a reaction process of 01 + Cpx+Melt =O1+Opx +Melt. However, petrographic observation for the peridotitic xenoliths from Fangshan does’not show this kind of reaction process,indicating that there was still residue of the old lithospheric mantle material beneath this area. Comparing with the Early Paleozoic mantle peridotite from the North China Block,the peridotitic xenoliths in Subei basin are more fertile in basaltic components with the Fo values of olivines being from 0. 89 to 0. 90 and the En values of orthopyroxenes being from 0. 88 to 0. 90,indicating that the lithospheric thinning and the lithospheric mantle replacement took place from Early Paleozoic to Cenozoic. The estimated equilibrium temperature of peridotites from Panshishan and Fangshan ranges from 940℃ to 1 010℃ and 985℃ to 1 081℃, respectively. The estimated equilibrium pressure for that of Panshishan and Fangshan ranges from 0. 90 GPa to 2. 07 GPa and from 1. 65 GPa to 2. 61 GPa, corresponding to depth of 29 km to 66 km and 53 km to 84 km, respectively. Therefore,the derived depth of xenolith from Panshishan was less than that of Fangshan. The thickness of lithospheric mantle underneath Subei basin during Cenozoic was about 50 km between 30 km arid 80 km depths in the lithospheric profile.
中文关键词	橄榄岩包体 ; 平衡温压 ; 岩石圈地幔 ; 苏北盆地 ; 新生代
英文关键词	peridotitic xenolith equilibrium temperature and pressure lithospheric mantle Sub-ei basin Cenozoic
语种	中文
国家	中国
收录类别	CSCD
WOS类目	MINERALOGY
WOS研究方向	Mineralogy
CSCD记录号	CSCD:2839309
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/221185
作者单位	1.甘肃省地质矿产勘查开发局, 兰州, 甘肃 730000, 中国; 2.合肥工业大学资源与环境工程学院, 合肥, 安徽 230009, 中国
推荐引用方式 GB/T 7714	刘建宏,闫峻. 苏北盆地新生代玄武岩中的地幔橄榄岩包体[J],2007,27(2):39-46.
APA	刘建宏,&闫峻.(2007).苏北盆地新生代玄武岩中的地幔橄榄岩包体.,27(2),39-46.
MLA	刘建宏,et al."苏北盆地新生代玄武岩中的地幔橄榄岩包体".27.2(2007):39-46.

条目包含的文件
条目无相关文件。

个性服务

谷歌学术

百度学术

必应学术

相关权益政策

收藏/分享