| 冀东太平寨地区麻粒岩及有关岩石的辉石研究 |
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| 引用本文： | 张儒瑗,从柏林,应育浦.冀东太平寨地区麻粒岩及有关岩石的辉石研究[J].地质科学,1982,0(2):134-143. |
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| 作者姓名： | 张儒瑗 从柏林 应育浦 |
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| 作者单位： | 中国科学院地质研究所 |
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| 摘 要： | 冀东早太古代迁西群是由火山-沉积岩系变质生成的一套变质杂岩。它的主体是麻粒岩类以及退变质生成的斜长角闪岩类的岩石。该套变质岩系的下部夹有层状和透镜状变质超镁铁质岩(变橄辉岩、变辉橄岩、变辉石岩及变闪辉岩),而上部为变质的含铁岩系。以石渣子山和娄子山为例,它们的含铁岩层分别为辉石磁铁石英岩和英榴易熔岩。 本区的麻粒岩和斜长角闪岩在岩相学上呈渐变关系。绝对不含角闪石和/或富钛黑云母的麻粒岩是很少的。本文将以角闪石和斜长石为主要组成矿物的岩石归为斜长角闪岩类。在斜长角闪岩类岩石中,角闪石含量大大超过辉石,另外常见被角闪石交代的辉石残晶。
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STUDY ON THE PYROXENES FROM THE GRANULITES OF TAIPINGZHAI,EASTERN HEBEI,CHINA |
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| Zhang Ruyuan,Cong Bolin,Ying Yupu.STUDY ON THE PYROXENES FROM THE GRANULITES OF TAIPINGZHAI,EASTERN HEBEI,CHINA[J].Chinese Journal of Geology,1982,0(2):134-143. |
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| Authors: | Zhang Ruyuan Cong Bolin Ying Yupu |
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| Institution: | Institute of Geology, Academia Sinica, Beijing |
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| Abstract: | This paper presents wet chemical analyses of fifteen samples of orthopyroxenes and ten of clinopyroxenes from the granulites and related rocks of the Taipingzhai,Eastern Hebei province.These samples are also determined by infrared and Moss-bauer spectra.On the basis of these data obtained,the points discussed by the authors are as follows:(1) The chemistry of pyroxene and its relation to the bulk composition of host rock;(2) The distribution coefficient of Fe-Mg in coexisting pyroxene pair and its significance in crystal chemistry or in petrogenesis;(3) The P-T conditions of metamorphic recrystallization of the pyroxene pair.This study shows that the f-value of pyroxenes increases with the increase of total Fe as (FeO) and (FeO)/MgO ratio of host rock.The average KD(Fe) of the coexisting pyroxene pairs is about 1.87,changing in a narrow range,and is close to that of Madaras and Swat granulites.The intersection of coexisting pyroxene pairs on the Wo-En join,ranging from Wo70 to Wo34 depends on the type of host rock.By using tre three two-pyroxene geothermometers and Wood’s orthopyroxene-garnet geobarometer,the two-pyroxene equilibrium P-T conditions for the from the Taipingzhai granulites and the Louzi Mt.are eulysites calculated as 850±60℃ at 11 kb and 800±60℃ at 13kb,respectively.The closing temperature of intracrystalline ion exchange equilibrium in the orthopyroxene is about 500℃. |
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