Charnockite Formation and Early Precambrian Crust Evolution in Yishui Area, Shandong Province, China

来源 :中国地质大学学报 | 被引量 : 0次 | 上传用户:xiaoaixiaoaixiaoai
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Charnockite and granulite in Yishui area, Shandong Province are located in the middle part of the Tancheng-Lujiang fault zone, eastern China. Field studies have shown that the charnockites, derived from the adjacent granulites, are classified as three types: enderbite, garnet-enderbite and hypersthene-trondhjemite. In addition, two generations of minerals are present in the charnockites: the relic minerals such as garnet, hypersthene and clinopyroxene, and the neocrystallized minerals such as plagioclase and K-feldspar. The relic minerals occurring in the granulite facies stage were affected by the later partial melting. The relic minerals, irregular and usually ragged in shape, occupy the interstitial positions in the neocrystalline minerals. The neocrystalline minerals are usually euhedral-subhedral crystals. The study of petrology, mineralogy and geochemistry of charnokites concludes that the enderbite was formed by the anatexis of the two-pyroxene plagioclase granulite, that the garnet-enderbite was formed by the anatexis of sillimanite garnet gneiss, and that the hypersthene-trondhjemite was formed by the anatexis of the leucocratic two-pyroxene plagioclase granulite. The U-Pb dating of the zircon indicates that the formation of the charnockite and granulite was related to the Archean-Proterozoic upwelling of a mantle plume (hot spot)around 2 500 Ma, in Yishui area, Shandong Province.
其他文献
词汇是语言的基本单位,学好词汇是学好英语的关键之一,离开了词汇,就谈不上语言,更谈不上对语言的运用。常言道:工欲善其事,必先利其器。笔者对词与词之间的规律进行了一些探
Garnet is an important rock-forming mineral of high-pressure and ultrahigh-pressure metamorphic rocks. Its popular isomorphism complicates its chemical composit
The main reason why the application of nuclear technology in petroleum exploration has not yet been accepted by most exploration workers is that they are not cl
The Altay orogenic belt of China is an important metallogenic belt of base metals, rare metals and gold. The main orogenic-metallogenic epoch is the Hercynian (
This paper presents magnetic susceptibility results of 578 samples from three Devono-Carboniferous carbonate successions in the Yangtze Block. They indicate tha
为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7
植物词语在汉英两种语言中的文化意义存在较大差异,了解其文化内涵的差异及产生这种差异的原因对跨文化交际具有重要的指导意义。本文简要介绍植物词汇的概念意义和文化意义
One year of ocean topography experiment (TOPEX) altimeter data are used to study the seasonal variations of global sea surface wind speed and significant wave h
An 18-year-long (1981-1998) study was conducted in Hainan Island waters (22°20'N, 110°39′E) to determine the relationship between δ18O in skeletal aragonite
The Middle Triassic was the great turning period of South China from marine sedimentary basins to continental deposits or erosion. This paper summarizes the dis