【摘 要】
：
Located in the eastern part of the East Qinling molybdenum belt, the Donggou deposit is a superlarge porphyry molybdenum deposit discovered in recent years. The
【机 构】
：
Institute of Mineral Resources, China University of Geosciences,Beijing SHRIMP Center
论文部分内容阅读
Located in the eastern part of the East Qinling molybdenum belt, the Donggou deposit is a superlarge porphyry molybdenum deposit discovered in recent years. The authors performed highly precise dating of the mineralized porphyry and ores in the Donggou molybdenum deposit. A SHRIMP U-Pb zircon dating of the Donggou aluminous A-type granite-porphyry gave a rock-forming age of 112±1 Ma, and the ICP-MS Re-Os analyses of molybdenite from the molybdenum deposit yielded Re-Os model ages ranging from 116.5±1.7 to 115.5±1.7 Ma for the deposit. The ages obtained by the two methods are quite close, suggesting that the rocks and ores formed approximately at the same time. The Donggou molybdenum deposit formed at least 20 Ma later than the Jinduicheng, Nannihu,Shangfanggou and Leimengou porphyry molybdenum deposits in the same molybdenum belt, implying that these deposits were formed in different tectonic settings.
其他文献
通过探索当前数字化学习和移动学习设计的原则和模型,本文试图找出设计云学习的有效方法.同时,文中还介绍了好的网络和移动电子学习产品的图像和设计特征.然而,如何更好地设
目的 研究纤维蛋白原(Fib)Bβ-1420G/A、-993C/T、1689T/G、BsmAIG/C、I6I/D、345C/T、HinfIA/C位点基因多态性及其构建的单体型与血浆Fib功能表达及脑梗死的关系.方法 选择
慧琳《一切经音义》中讹、脱、倒、衍等文字问题皆有存在.勘正这些谬失,无论是对慧琳音义的研究,还是对小学、文学、佛学、史学等的研究都有积极的意义.
文章结合山西方言对前贤时哲关于《金瓶梅词话》中四个词语的立目、释义进行了考辨,以期使读者能更准确地把握词义、理解原著,也为大型辞书的修订提供新的依据。
In this pa
汉语园径现象是指由歧义结构、特殊谓词或由一些特殊语用需要造成的,在理解过程中需要一次折返推翻前一次线性理解并实现焦点信息转移的特殊语言现象。汉语园径现象可分为三
当前学术界出版了一系列汉语称谓辞典,但由于历史条件所限,存在着一些问题。本文以《汉语称谓大词典》为分析对象,考察其在立目、释义、书证等方面的疏失,为称谓词研究和称谓
本文笔者在多年理论和实践研究的基础上,从文化在图书馆知识管理的功能、图书馆文化、图书馆文化对图书馆知识管理体现的作用、建立有效的图书馆文化这四方面探索基于文化视
本文论述了《易经》理论对构建和谐护患关系的作。用，指出在构建和谐护患关系过程中，理解和信任是基础，彼此诚心以对是前提，护士应有一颗仁德之心，宽厚待人，严于律己，并在建立护患朋
Most supply chain programming problems are restricted to the deterministic situations or stochastic environments. Considering twofold uncertainty combining grey
Due to the combinatorial nature of cell formation problem and the characteristics of multi-objective and multi-constrain, a novel method of evolutionary algorit