【摘 要】
：
The Xiongdian eclogite occurring in the Sujiahe tectonic melange zone at Luoshan County,Henan Province,in the western Dabie Mountains,is typical high-pressure(H
【机 构】
：
Institute of Geology,China University of Geosciences,Australian National University
论文部分内容阅读
The Xiongdian eclogite occurring in the Sujiahe tectonic melange zone at Luoshan County,Henan Province,in the western Dabie Mountains,is typical high-pressure(HP)-ultrahigh-pressure(UHP)and mediumtemperature eclogite.The occurrence,internal texture and surface characteristics of zircons in eclogite were studied rather systematically petrographically combined with the cathodoluminescence(CL)and scaning electron microscope(SEM)methods.Zircons are mainly hosted in granet and other metamorphic growth texture in the interior,thus indicating that they are the product of metamorphism.SHRIMP analyses give zircon206Pb/238U ages of 335 to 424 Ma and show a certain degree of radiogenic Pb loss;therefore it may be inferred that the age of 424+5Ma represents the minimum age of a HP-UHP metamorhphic age.From the above analyses coupled with previous Sm-Nd,40Ar-39Ar,U-Pb and 207Pb/206Pb age data,it is suggested that the peak metamorphic age of the Xiongdian eclogite should be between 424 and 480Ma.This study further validate the view of the existence of a Caledonian HP-UHP metamorphic event in the western Dabie Mountains
其他文献
本文主要阐述了室内装修装饰带来的环境污染,详细描述了各种污染物的理化性质,污染的来源及其释放途径以及对人体危害的机理和伤害程度.
Based on the Rb-Sr isochron dating results, this paper suggests that the alkaline intrusive belt at the east foot of the Taihang-Da Hinggan Mountains were forme
LINQ(.NET Language Integrated Query)是Visual Studio 2008和.NET Framework 3.5版中一项突破性的创新,本文给出了一种基于LINQ的构建应用系统的三层结构方式,讨论了LINQ技
Palaeozoic kimberlites from Mengyin, Shandong and Fuxian, Liaoning, eastern China, contain plenty of mantle xenoliths (peridotites, eclogites) and megacrystic m
习语是以特定话语场景中临时构建的语言单位组合为基础而形成的固定话语成品,在很长时期内为人们所相沿习用,包括成语、惯用语、谚语和歇后语等。每个习语的形成,虽然都有其
Dinoflagellates are single celled organisms that reflect the ecological conditions in modem oceans and lakes. Their earliest undisputed fossil record suggests t
The dynamic effects in measurements of unsteady flow when using a probe with quasi-steady calibration curves has been investigated in this paper by numerical si
本文以理论结合实践，探讨了城市规划实施的综合概念，城市规划实施的目的与作用，城市规划实施的行政机制、财政机制、法律机制、经济机制和社会机制等问题，并论述了城市规划实施的
Flame temperature distribution is one of the most important characteristic parameters in combustion research. The emission method is a good way to measure the l
Modern analysis techniques that provide improved viability have enabled further investigation of plug nozzle rocket engines as advanced launch vehicle concepts.