| 超基性岩体中橄长岩-异剥辉长岩分异脉岩与铬铁矿的成因联系 |
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| 引用本文： | 袁棨林,解广轰,张凤岭,张玉彦.超基性岩体中橄长岩-异剥辉长岩分异脉岩与铬铁矿的成因联系[J].地质科学,1966,7(1):32-49. |
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| 作者姓名： | 袁棨林 解广轰 张凤岭 张玉彦 |
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| 摘 要： | 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。
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ON THE RELATIONS IN GENESIS BETWEEN CHROME SPINEL AND DIFFERENTIATED VEIN ROCK OF TROCTOLITE-DIALLAGEGABBRO IN ULTRABASIC ROCK BODIES |
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| YUAN CHI-LIN,XIE GUANG-HONG,CHANG FENG-LING,CHANG YU-YAN.ON THE RELATIONS IN GENESIS BETWEEN CHROME SPINEL AND DIFFERENTIATED VEIN ROCK OF TROCTOLITE-DIALLAGEGABBRO IN ULTRABASIC ROCK BODIES[J].Chinese Journal of Geology,1966,7(1):32-49. |
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| Authors: | YUAN CHI-LIN XIE GUANG-HONG CHANG FENG-LING CHANG YU-YAN |
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| Abstract: | The authors have studied some ultrabasic rocks of the same type from two geosyn- dine regions.It has been found out that these rocks belong to magnesian ultrabasic rock type constituted mainly by pyroxene-olivinfel.When a rock body contains differentiated vein rock of troctolite-diallagegabbro related in genesis to late magmatic chromite,its ore- forming chrome spinel will be rich in allumium and less chromium and is used as low content metallurgic rank and fireproof rank ore.If the rock body contains no above- mentioned vein rocks,its chrome spinel will be rich in chromium and less allumium and is used as high content mettallurgic rank ore.Then the rock bodies can be divided into two different types according to whether the differentiated vein rock present or not. After analysing the data from Japan,Cuba and Philippines,the same conclusion as discussed above can be also reached. It is proved that differentiated vein rocks are related to late magmatic chromite. The variety of composition of ore-forming chrome spinel is controlled by the concentra- tion of alluminum in the original magma. |
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