排序方式: 共有31条查询结果,搜索用时 15 毫秒
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汉诺坝玄武岩及大同火山群的岩石学和同位素地球化学 总被引:3,自引:4,他引:3
利用主元素、造岩矿物、REE及Sr、Nd、Pb同位素资料,对汉诺坝玄武岩和大同火山群的岩石学、地球化学、地幔源区特征、岩浆的分异和演化、玄武岩岩浆活动的构造条件进行了讨论。 相似文献
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1958年袁棨林在我国北部一地槽区曾注意到有两类超基性岩体。第Ⅰ类有橄长岩-异剥辉长岩分异脉岩(以下简称分异脉岩)的岩体,其造矿铬尖晶石为较富铝的富铬尖晶石亚种和富铁富铬尖晶石亚种,组成低品位冶金级矿石;第Ⅱ类为无分异脉岩的岩体,其中合富铬贫铝的铬铁矿亚种和富铁铬铁矿亚种,组成高品位冶金级矿石。它们虽然都是镁质超基性岩,同样是以斜辉辉撖岩为主的纯橄榄岩-辉橄岩杂岩体,而且都显示了较强的动力分异作用,只是由于出现或不出现与晚期岩浆铬铁矿有成因关系的分异脉岩,而使造矿铬失晶石成分有明显地不同。 相似文献
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Tectonic Environments of Cenozoic Volcanic Rocks in China and Characteristics of the Source Regions in the Mantle 总被引:1,自引:0,他引:1
Extensive volcanism is one of the important features of Cenozoic geology in China.Based on temporal-spatial distribution,the volcanism was associated with three major different geological settings:1)the continental rift basalts in Northeast and North China;2)the tension-fault basalts on the continental margins of Southeast China; and 3) the collision-zone high-K volcanics in the Qinghai-Xizang Plateau and its vicinities.The characteristics of “depletion in the south and enrichment in the north“of the China continental mantle are strongly supported by isotopic evidence.The Cenozoic continental cal characters,into the following geochemical provinces:1)the depleted mantle in South China;2)the primary mantle in Northeast and NorthChina; 3)the hybrid and transi-tional mantle in the region of Shandong ,Anhui,Jiangsu and northern Zhejiang;4)the depleted mantle around the Bohai Bay and the Lower Liaohe River;5)the K-metasomatic enriched mantle in the northern part of Northeast China;and 6)the re-cycled enriched mantle in the ancient subduction zone in the Qinghai-Xizang Plateau and its surround-ings.These geochemical characteristics on a regional scale must be a reflection of the nature of lithosphere evolution. 相似文献
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大庙斜长岩杂岩体的岩石学特征 总被引:7,自引:0,他引:7
斜长岩产出可分为两类:层状型和岩体型。前者不形威独立岩体,而为层状基性-超基性杂岩中的斜长岩层。这种杂岩体具韵律性,层状构造发育,造岩矿物成分随层位有规律变化,它是基性岩浆重力结晶分异的产物,时代不限。岩体型斜长岩只产于前寒武纪,呈巨大岩体,多见于地台和地质的边缘,常与环斑花岗岩共生。它在大陆壳的分布虽不广,但其产出的构造位置、侵入的围岩、形成时代、岩性及与之共生岩石和含矿性等都有明显的共性。 相似文献
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