| 多硅白云母b0值对澜沧群中压和高压变质的反映 |
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| 引用本文： | 宋仁奎,应育浦.多硅白云母b0值对澜沧群中压和高压变质的反映[J].地质科学,1997,32(1):56-64. |
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| 作者姓名： | 宋仁奎 应育浦 |
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| 作者单位： | 中国科学院地质研究所 北京 100029 |
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| 摘 要： | 多硅白云母b0值作为相对地质压力计的理论和方法,已受到各国地质学家的普遍重视。本文以澜沧群多硅白云母作为研究对象,提出运用多硅白云母b0值区分不同压力变质的方法。研究结果表明澜沧群经历了中压和高压变质作用,两期变质的多硅白云母b0值分别为9.027Å和9.047Å。
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| 关 键 词： | 多硅白云母 b0值 中压和高压变质 澜沧群 |
| 收稿时间： | 1995-12-27 |
| 修稿时间： | 1995-12-27; |
THE MEDIUM-AND HIGH-PRESSURE METAMORPHISMS OF LANCANG GROUP REFLECTED BY b0 VALUES OF PHENGITES |
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| Song Renkui,Ying Yupu,Ye Danian.THE MEDIUM-AND HIGH-PRESSURE METAMORPHISMS OF LANCANG GROUP REFLECTED BY b0 VALUES OF PHENGITES[J].Chinese Journal of Geology,1997,32(1):56-64. |
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| Authors: | Song Renkui Ying Yupu Ye Danian |
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| Institution: | Institute of Geology, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | The theory and method of b0 values of phengites regarded as a relative geobarometer have been valued by geologists of the world. There is no research on polymetamorphism reflected by b0 values of phengites reported in the world today. We think that the populations of b0 values must be distinguished in the study of b0 values of phengites of low grade metamorphic rocks occurred in ancient orogenic belts, especially, for the polycyclic orogenesis in China. In this paper, the authors put forward a method of distinguishing polymetamorphism by statistical analyses of b0 values of phengites on the basis of research on phengites of Lancang Group. Statistical analyses of 486 b0 values of phengites show that there are medium-and high-pressure metamorphisms in Lancang Group. The intersection of two straight lines representing bi-nomal distributions is situated at the point corresponding to b0=9.040Å in probability graph. The mean b0 value of high-pressure is 9.047, the standard deviation and cumulative probability are 0.005 and 55% respectively. The average b0 value of medium-pressure metamorphism is 9.027Å, its standard deviation is 0.010. The cumulative frequency curve of medium-pressure metamorphism is situated between cumulative frequency curves of Ryoke and Easterm Alps. The cumulative frequency curve of high-pressure is similar to that of Sanbagawa. |
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| Keywords: | Phengite b0 value" target="_blank">b0 value')" href="#">b0 value Medium-and High-pressure metamrophisms Lancang Group |
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