| 松潘—甘孜造山带三叠系陆源碎屑岩燕山早期同造山区域近变质作用 |
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| 引用本文： | 夏宗实.松潘—甘孜造山带三叠系陆源碎屑岩燕山早期同造山区域近变质作用[J].四川地质学报,1993(3). |
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| 作者姓名： | 夏宗实 |
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| 作者单位： | 四川省地矿局科研所 |
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| 摘 要： | 近变质带(Anchizone)是成岩作用带与浅变质带之间的过渡带。由德国格丁根大学地质与岩石圈动力学研究所首次对松潘-甘孜造山带三叠纪沉积地层中伊利石结晶度及K-Ar法年龄进行了测定。结合区域地质资料对这些数据进行解释,初步认为松潘-甘孜造山带(至少在南部)主要为燕山早期同造山区域近变质带,其变质强度比较均一,低于浅变质作用。对近变质作用机理,依据年龄值结合其它地质资料进行了初步分析。这一方法在松潘-甘孜造山带地质演化历史研究及有关矿床勘查方面有着广泛而良好的利用前景。
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| 关 键 词： | 松潘—甘孜造山带 伊利石结晶度 燕山早期 近变质作用 |
SYNOROGENIC REGIONAL ANCHI-METAMORPHISM OF TRIASSIC TERRIGENOUS CLASTIC ROCK IN SONGPAN-GARZE OROGENIC BELT IN EARLY YANSHAN EPOCH |
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| Xia Zhongshi.SYNOROGENIC REGIONAL ANCHI-METAMORPHISM OF TRIASSIC TERRIGENOUS CLASTIC ROCK IN SONGPAN-GARZE OROGENIC BELT IN EARLY YANSHAN EPOCH[J].Acta Geologica Sichuan,1993(3). |
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| Authors: | Xia Zhongshi |
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| Abstract: | Anchizone is a transitional zone from diagenetic metamorphic zone to epimetamorphic zone. Crystallinity and K-Ar age of illite in Triassic sedimentary formation in Songpan-Garze orogenic belt have been determinated firstly by the Institute of Geology and Lithosphere Dynamics ,Gottingen Uni-versity. Based on these data and the regional geological information, it is concluded preliminarily that Songpan-Garze orogenic belt (its southern district at least) resulted mainly from synorogenic regional anchi-metamorphism in Early Yanshan epoch. The present paper has discussed mechanism of anchi-metamorphism on the basis of various age values and regional geological information. This method is of vast vistas to the research on geological history of Songpan-Garze orogenic belt and to the prospect-ing of mineral deposits. |
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| Keywords: | Songpan-Garze orogenic belt crystallinity of illite Early Yanshan epoch anchi-metamorphism |
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