Precipitation of rutile needles in garnet from sillimanite-bearing pelitic granulite from the Khonda

来源 :Chinese Science Bulletin | 被引量 : 0次 | 上传用户:sinosteelpower
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
Pelitic granulite from the Khondalite Belt,North China Craton,is composed of garnet,sillimanite,perthite,biotite and quartz.Oriented rutile needles in garnet are reported for the first time from the granulite.The rutile needles have been identified by optical microscopy and confirmed by in situ Raman spectroscopy,where they show the characteristic bands at 446–448 and 610 cm-1.Because of their very strong shape preferred orientation in3–4 easily observable directions,these rutile needles are interpreted to have formed by precipitation during exhumation and cooling following peak metamorphism.The ternary feldspar geothermometer gives a peak metamorphic temperature of*980°C at 10 kbar.The presence of oriented rutile needles in garnet is suggested to be a valuable indicator of ultrahigh-temperature(UHT)metamorphism in the Khondalite Belt and therefore likely in other UHT terrains. Pelitic granulite from the Khondalite Belt, North China Craton, is composed of garnet, sillimanite, perthite, biotite and quartz.Oriented rutile needles in garnet are reported for the first time from the granulite. The rutile needles have been identified by optical microscopy and confirmed by in situ Raman spectroscopy, where they show the characteristic bands at 446-448 and 610 cm-1. Because of their very strong shape preferred orientation in 3-4 easily observable directions, these rutile needles are interpreted to have formed by precipitation during exhumation and cooling following peak metamorphism. The ternary feldspar geothermometer gives a peak metamorphic temperature of * 980 ° C at 10 kbar. The presence of oriented rutile needles in garnet is suggested to be a valuable indicator of ultrahigh-temperature (UHT) metamorphism in the Khondalite Belt and therefore likely in other UHT terrains.
其他文献
中国冶金地质总局三勘院在山西省盂县开展的一铁矿普查项目取得新进展,其深部发现新的铁矿体。该铁矿体产于超基性岩中,主要成分为橄榄石、磁铁矿,磁铁矿品位最高达32.22%,初
淮北矿业(集团)公司青东煤矿在经济形势不利的情况下,积极进行经营管理的创新,效果显著。矿井面临的经营形势2014年,青东煤矿继续面临异常严峻的经营形势。从宏观形势看,经济
随着时代的进步,我国的社会也进入了高速发展的时代,而作为我国的基础教育行业,同时也在有条不紊地进行改革。新的教学理念、教学模式对我国基础教育有着至关重要的作用。随
期刊
Rochelle and Emma were mad about horses.~1 Theyboth lived near a farm,and visited the farmer’shorses whenever they could.Neither of them had everbeen on a hor
We have been house-hunting for a couple ofmonths. It is a bit like1988 when we bought our first house,when the market seemed to know oneway—up and up. Then, t
构成本文经线和纬线的是埃米莉开车送孩子到学校,埃米莉对节日的回忆。整个故事情节就是在这两条经线和纬线的纵横交错之中展开。作者运用内心独自、人物感受,把家庭温馨,父
自有文明尤其是工业革命以来,人类在科学技术上取得的成就以一日千里来形容可说毫不夸张,而技术进步给人类带来的好处也是显而易见。随便举几个例子:技术进步使我们的种族以
安全生产工作事关员工生命安全及企业的经济效益,杭氧板式厂通过加大安全生产宣传、教育和培训的力度,提高员工的安全意识和自我保护意识,生产过程中做好安全预防工作,打造平
期刊
随着工作压力日趋加重.空闲时间日趋缩减,重获游戏的快乐显得格外重要。五十年前,评论家们曾经为如何支配“自动化革命”所产生的空余时间而冥思苦想。然而,美好的科技生活