Mixing events between the crust-and mantle-derived magmas in Eastern Kunlun:Evidence from zircon SHR

来源 :科学通报(英文版) | 被引量 : 0次 | 上传用户:ylg2008asp
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
Various shaped mafic microgranular enclaves (MMEs) together with several mafic massifs are developed within the Yuegelu granitoid pluton in the eastern part of the Eastern Kunlun. On the basis of detailed field geological surveying and of the results of the petrological and geochemical studies it is suggested that there must be some genetic relationship among the granodiorite host, the MMEs and the hornblende (Hb)-gabbro massifs. Magmatic zircon grains are extracted from samples of granodiorite host rock, Hb-gabbro and the MMEs for U-Pb dating. The U-Pb ages are determined by using SHRIMP Ⅱ technique, which yields the ages of 242±6 Ma, 239±6 Ma and 241±5 Ma, respectively. The overall correspondence in the U-Pb dating results of them excludes the possibility that the MMEs in the granitoids are solid refractory relics from the source region or that they are xenoliths from the wall rocks. It can also rule out the possibility of a later emplacement of basic magma after the solidification of the granitoids. This dating result indicates that they are the products of magma mixing in early-mid Triassic epoch. Among them the granitoid host is chemically akin to the acidic end member during the magma mixing process, the Hb-gabbro is akin to the basic ones while the MMEs are the incompletely mixed basic magma clots trapped in the acidic magma. Combined with the results from other researches on this pluton it is reasonable to consider that in the mid-Triassic the Eastern Kunlun granitoid belt had undergone a process of magma mixing between the mantle-derived basic magma and the crustal acidic magma which indicates that the injection of mantle materials and energy into the crust and the reactions between them played an important role in the formation of the granitoid rocks.
其他文献
对于仲裁协议效力异议的决定机构,当前的国际通例是以法院和仲裁庭“并存控制”的方式决定协议的效力,否定仲裁庭为唯一的决定机构的做法;而我国的决定机构则是以法院和仲裁
银行担保作为一种新型的人的担保,对于保证国际贸易的顺利进行有着十分重要的作用.而银行担保的管辖权及法律适用问题直接关系到案件审理所适用的程序法以及相关的实体法,因
诉讼标的及其理论是民事诉讼法的核心问题,它是诸多民事诉讼理论和司法实践问题解决的基础。随着中国社会的发展和转变,我国的民事诉讼实践也在不断的发展,所以与之相对应的
;本文从政治文化的角度,探讨不同的社会历史时期,传统的政治文化思想对图书馆核心价值的影响,并以目前图书馆核心价值的现状分伯图书馆核心价值体系构建的政治文化因素.
中国第5条第2款对票据越权代理作了规定.作者认为,这一规定比较粗略,而且不符合票据法的基本原则,不利于保护持票人的权利.笔者对票据越权代理的概念、中国有关规定进行了分
情势变更原则在我国合同法的制定中一直是讨论的热点之一,曾在多个合同法草案中有所规定.虽然我国合同法最终并未采纳情势变更制度,但在当前的金融危机之下,因为金融局势的动
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
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
作为诚实信用原则在合同履行过程中的具体化,附随义务无疑弥补了给付义务在债权圆满实现上的不足,应该说是当事人内心意思的当然补充,由此更好的维护和促进交易。但与给付义
A detailed record of sea level changes during the last 2500 years is preserved in the northernwest coast of Fildes Peninsula in Antarctica. Fourteen marine alga