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《Journal of Jiling University (Earth Science Edition)》 1989-04
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ORIGINAL STUDY OF GARNET FROM THE TAIPINGZHAI-JINCHANGYU AREA, IN EASTERN HEBEI PROVINCE

Chen Manyun  
Garnet are commonly found in the metamorphic rocks in the Taipingzhai-Jin-changyu area.They can be divided into two types based upon their field occurence, relationship with other minerals of rocks and formed conditions.One is paragenetic relation with minerals in garnet-bearing felsic gneisses. The other is maily around the pyroxene and oxide of iron. The hornblende and biotite are occasionally rimmed by garnet,showing coronitic texture in the metamafic rocks, BIF and charnockites. Chemical compositions and geological time are different between the two garnet types.The former had been formed before the main tectonics in this area. It is composed mainly of almandine, and pyrope is subordinate component. The later was formed after main tectonics.Its major component is almandine,pyrope and calc-gar-net are subordinate.Garnet composition is controlled by Cao and FeO in the bulk rock composition. Within the same section, the composition of garnet in coronas cored by clinopyro-xene differs only slightly from that in coronas cored by oxide of iron.FeO/FeO + Mg ratio of garnet-hypens theae and Fe2+/Fe2+ + Mg ratio of garnet-colinopyroxene and garnet-hornblende all show a tendency with positive correlation, indicating that they are subjected to the similar P-T conditions.PH2o is one of significant factors which controls formation of garnet. Lower PH2O is favourable for the formantion of garnet. On the contrary, higher PH2O is favourable for formation of hornblende. The inhomogeneous ultrami-cro-cracks brought about different PH2O and yielded aggregate parts of garnet and hornblende in the metamafic dykes. It is indicated that garnet and hornblende are formed in the same temperature conditions in the same time.By methods of geothermometer and geobarometer,the calculated temperature is 760-770℃ at 1 GPa for garnet in coronitic rims,and 820-830℃ at 0.88-1 GPa for coexisting garnet.The former is equal to amphibolite granulite subfacies and the later, to pyroxene granulite subfacies.
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【References】
Chinese Journal Full-text Database 2 Hits
1 Chen Manyun(Department of Geology);GEOLOGICAL FEATURE AND STUDY OF ORIGIN OF ORTHOPYROXENE GROUP IN TAIPINGZHAI AREA, EASTERN HEBEI PROVINCE[J];;1991-04
2 Liu Xianwen Yang Zhensheng(Defarlmnt of Geology);RESEARCH ON GEOLOGICAL PROBLEMS OF ARCHAEAN HIGH-GRADE TERRANE IN EASTERN HEBEI PROVINCE[J];;1993-01
【Co-citations】
Chinese Journal Full-text Database 10 Hits
1 XV Baoliang, CHEN Yinggong, HUANG Fusheng, SUN Yuxin(Department of Geology, Peking University; Regional Geological Surver Team of Hebei Province);Two Types of Granites of the Fengning District, Hebei Province[J];Acta Scicentiarum Naturalum Universitis Pekinesis;1993-02
2 HUANG Xiongnan LI Jianghai CHEN Zheng LIU Zhiqiang (School of Earth and Space Sciences,Peking University,Beijing,100871);Petrological and Structural Characteristics of the Zunhua Neoarchaean Ophiolitic Mélange:Proof of the Operation of Ancient Plate Tectonics[J];Acta Scicentiarum Naturalum Universitis Pekinesis;2003-02
3 XU Baoliang;YAN Guohan;ZHAO Hui;ZHANG Zhilong(Department of Geology,Peking Universty,Beijing,100871);Geochemistry of K_2O-U-Th Elements of Granites from Eastern China[J];ACTA SCICENTIARUM NATURALUM UNIVERSITIS PEKINESIS;1995-04
4 Mao Jianren;THE CHARACTERISTICS OF THE PETROLOGYOF THE LINGLONG-LUANJIAHE GRANITE INJIAODONG AND THE CONDITIONSOF ITS FORMATION[J];;1983-03
5 Fang Zhanren;THE FORMATION AND EVOLUTION OF ARCHAEAN GRANITOID ROCKS FROM EAST HEBEl AND SOUTHWEST LIAONING PROVINCES , CHINA[J];;1986-02
6 Liu Xishan;PROBLEMS IN APPLICATION OF THERMODYNAMICS TO ESTIMATION OF METAMORPHIC CONDITIONS[J];;1987-01
7 Zhang Xingzhou He Tongxing;THE ORIGIN OF SILLIMANITE IN ZHONGMEN AREA, PUTIAN, FUJIAN[J];;1988-04
8 Zhao Wenhao(No,2 Geological Prospecting Team, Bureau of Geology and Mineral Resources of Hebet Province);MAJOR CHARACTERISTICS OF METAMORPHOSED BASIC DYKE SWARMS, EASTERN HEBEI PROVINCE[J];;1988-04
9 Liu Shuwen;THE TWO DIFFERENT EVOLUTIONAL TRENDS OF SIHETANG GRANITOID COMPLEX, BEIJING[J];;1990-02
10 Zhai Xiaoming He Tongxing;ARCHAEAN GABBRO INTRUSION IN JINCHANGYU-WANGCHANG AREA, EASTERN HEBEI, CHINA[J];;1990-02
【Co-references】
Chinese Journal Full-text Database 7 Hits
1 Jin Shiqin Li Dianchao;PYROXENES FROM GRANULITE FACIES, NORTH CHiNA[J];;1986-02
2 Chen Manyun(Department of Geology);GEOLOGICAL FEATURE AND STUDY OF ORIGIN OF ORTHOPYROXENE GROUP IN TAIPINGZHAI AREA, EASTERN HEBEI PROVINCE[J];;1991-04
3 Lu Liangzhao Jin Shiqin Ye Huiwen Zheng Songyan (Changchun Geological College);GEOTHERMOMETRIC AND BAROMETRIC STUDIES OF METAMORPHISM OF THE MIYUN GROUP NEAR BEIJING[J];Geochimica;1984-01
4 Fu Zhaoren Shan Wenlang Ge Mengchun;DEFORMATION FACIES ANALYSIS OF SRUC URES OF METAMORPHIC LAYERS[J];;1983-03
5 Suo Shutian You Zhendong Han Yuqing Zhong Zengqiu (Wuhan College of Geology, Wuhan 430074);TECTONIC FEATURES OF PRECAMBRIAN METAMORPHIC ROCKS IN CHINA[J];;1987-05
6 Chen Manyun (Changchun College ot Ceology);METABASIC DYKE SWARMS IN A HIGH-GRADE METAMORPHIC TERRANE——A CASE STUDY IN THE TAIPINGZHAIJINGCHANGYU AREA, EASTERN HEBEI PROVINCE[J];Acta Geological Sinica;1990-02
7 Liu Xishan, Jin Wei and Li Shuxun (Changchun University of Earth Sciences, Changchun, Jilin);LOW-PRESSURE METAMORPHISM OF GRANULITE FACIES IN AN EARLY PROTEROZOIC OROGENIC EVENT IN CENTRAL INNER MONGOLIA[J];Acta Geological Sinica;1992-03
【Secondary References】
Chinese Journal Full-text Database 5 Hits
1 Liu Xianwen Yang Zhensheng(Defarlmnt of Geology);RESEARCH ON GEOLOGICAL PROBLEMS OF ARCHAEAN HIGH-GRADE TERRANE IN EASTERN HEBEI PROVINCE[J];;1993-01
2 LIU Zheng-hong,XU Zhong-yuan,YANG Zhen-sheng,CHEN Xiao-fengCollege of Earth Sciences,Jilin University,Changchun 130061,China;Metamorphic Tectonite Types and Their Characteristics[J];Journal of Jilin University(Earth Science Edition);2007-01
3 LI Jianghai1, NIU Xianglong1, QIAN Xianglin1 and TIAN Yongqing2 (1. Key Laboratory of Orogenic Belt and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China; 2. Shanxi Institute of Geological Science, Taiyuan, SX 030012, China);DIVISION OF ARCHEAN/PROTEROZOIC BOUNDARY AND ITS IMPLICATION FOR GEOLOGICAL EVOLUTION IN WUTAI MOUNTAIN AREA, NORTH CHINA[J];Geotectonica Et Metallogenia;2006-04
4 LI Jiang-hai, NIU Xiang-long, CHENG Su-hua, QIAN Xiang-linKey Laboratory of Orogenic Belt and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing100871, China;The Early Precambrian Tectonic Evolution of Continental Craton: A Case Study from North China[J];;2006-03
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