新疆西准噶尔包古图地区中酸性侵入体的岩石学、年代学和地球化学研究

CORC > 北京大学 > 地球与空间科学学院

	新疆西准噶尔包古图地区中酸性侵入体的岩石学、年代学和地球化学研究; Petrology, geochronology and geochemistry of intermediate-acidic intrusions in Baogutu area, West Junggar, Xinjiang
	魏少妮 ; 朱永峰
刊名	岩石学报
	2015
关键词	包古图磁铁矿钛铁矿锆石SHRIMP 西准噶尔 Baogutu Magnetite Ilmenite Zircon SHRIMP West Junggar
英文摘要	新疆西准噶尔包古图地区出露一些中酸性小岩体,以花岗闪长岩、石英闪长岩和闪长岩为主,富Na贫K,属于亚碱性岩石,Mg#值较高(平均0.48)。锆石U-Pb年代学研究表明其形成于310~319Ma期间。通过对比研究,划分出两种侵入体类型:I、Ⅱ、Ⅴ号岩体属于磁铁矿型侵入体,具有较高的氧逸度特征(LogfO2=-22~-16);Ⅲ号岩体属于钛铁矿型侵入体,显示较低的氧逸度特征。这些侵入体具有相似的微量元素和同位素地球化学特征:富集Cs、Rb、Ba、Th、U和LREE,亏损Nb、Ta、Ti,无明显Eu异常;(87Sr/86Sr)i为0.7036~0.7038,εNd(t)为6.64~8.30;具有年轻...; aThe intermediate-acidic intrusions in the Baogutu area (West Junggar, Xinjiang) are mainly granodiorite, quartz diorite and diorite, with SHRIMP ages of 310 similar to 319Ma. They are sub-alkaline, enriched in sodium and poor in potassium, with average Mg-# of 0.48. Two magma types are identified: intrusion I, II and V belong to magnetite type, which has higher oxygen fugacity (Logf(02) = -22 similar to -16); while intrusion III belongs to ilmenite type, with lower oxygen fugacity. These intrusions share similar trace element geochemical characteristics: Cs, Rb, Ba, Th, U and LREE enriched, while Nb, Ta and Ti depleted, without distinct Eu anomaly. They show a narrow range of initial Sr isotopic ratios (0.7036 similar to 0.7038), relatively high epsilon(Nd) (t) (6.64 similar to 8.30) and young Nd model ages (t(DMI) = 435.4 similar to 587.7Ma). These geochemical data indicates that the Baogutu intrusions might be produced by highly fractional crystallization of basaltic magma originated from metasomatised depleted mantle (and mixed with juvenile crustal melts) with no signs for old continental crust contamination.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000349509300011&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; SCI(E); 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 3; weishaoni03@163.com; 01; 143-160; 31
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/206518]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	魏少妮,朱永峰. 新疆西准噶尔包古图地区中酸性侵入体的岩石学、年代学和地球化学研究, Petrology, geochronology and geochemistry of intermediate-acidic intrusions in Baogutu area, West Junggar, Xinjiang[J]. 岩石学报,2015.
APA	魏少妮,&朱永峰.(2015).新疆西准噶尔包古图地区中酸性侵入体的岩石学、年代学和地球化学研究.岩石学报.
MLA	魏少妮,et al."新疆西准噶尔包古图地区中酸性侵入体的岩石学、年代学和地球化学研究".岩石学报 (2015).