Uprising period and elevation of the Wenyu granitic pluton in the Xiaoqinling District, Central Chin

来源 :Chinese Science Bulletin | 被引量 : 0次 | 上传用户:ruoxich
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
Xiaoqinling District is an important gold-producing area in China.It ranks second to Jiaodong with regard to gold deposits.The uprising period of the Wenyu granitic pluton and the wall-rocks of the deposit,as well as the mineralizing depth and reserved place of gold ore bodies,are significant to ore exploration.Fission-track(FT)analysis of zircons and apatites of granitic rocks from the Wenyu granitic pluton shows that apatite FT(AFT)data modeling indicates a rapid cooling rate of 20°C/Ma from 138 to120 Ma after emplacement at 138 Ma.Thermal evolution and inversion curves suggest a secondary phase of fast cooling and uprising from 45 to 35 Ma,and 35 Ma,respectively,with a cooling rate of 6.7°C/Ma and a denudation quantity of~4.3 km.The last cooling phase took place from<4 Ma,with an average cooling rate of~11.3°C/Ma and a denudation amount of 1.3 km.Total exhumation quantity of 5.6 km and uprising elevation of 7.3 km are similar to the estimated results of fluid inclusions from the Dongtongyu and Wenyu gold deposits.The39Ar/40Ar dating of sericite from the fault planes of the Xunmadao-Xiaohe and Taiyao faults demonstrate two uprising activities of the ore-host metamorphic complex.The Huashan and Wenyu granitic plutons intensively occurred during 77 and 45 Ma,respectively.These data sets are valuable for understanding the uplifting process and for preserving gold ore bodies in the Xiaoqinling area,as well as for further studies on tectonic evolutions of the Taihua Complex and the Qinling-Dabie Orogen.
其他文献
游戏化教学是小学语文阅读教学的重要策略之一,它非常符合小学阶段学生的心理特征.在游戏化的课堂教学过程中,可以结合课程内容进行游戏设计,充分发挥游戏在趣味性和参与性等
《小草和大树》是苏教版小学语文六年级上册中的一篇课文。课文讲述了夏洛蒂·勃朗特三姐妹在逆境中成才的故事。我希望学生通过学习,领悟到只有具备坚强意志和聪明智慧的人,
小学语文教学的主要目的是培养学生写作与阅读的基础才能,即读写能力.本文主要探讨了小学语文的读写结合教学现状,并提出了小学语文读写结合教学的具体措施.
请下载后查看,本文暂不支持在线获取查看简介。 Please download to view, this article does not support online access to view profile.
在区域地质调查以及矿产调查工作中,往往会进行放射性伽玛的测量,从而寻找放射性矿产。本文分别介绍了区域地质调查以及矿产调查工作中放射性伽玛的测量方法,并对放射性伽玛
最近 ,拜读了张仁、王林二位先生发表在《新疆地方志》2 0 0 1年第四期上的文章《再谈哈密瓜的原产地域》,本不想多说 ,因我在《也谈哈密瓜的历史渊源》一文中 ,就“哈密瓜
“书籍是全世界的营养品。生活里没有书籍,就好像大地没有阳光;智慧里没有书籍,就好像鸟儿没有翅膀。”而我,如果在漫长的童年岁月中没有了书籍的陪伴,那就如同鱼儿离开了蔚蓝的大
Several days before the Ms7.0 Lushan earthquake,the YRY-4 borehole Strainmeter at Guza Station recorded prominent abnormal changes.The strain anomalies are very
随着教育改革的不断发展完善,教学方法也趋于完备.小学语文课堂中应该如何分配时间、采取怎样的教学方法和方式,都是教师需要深思熟虑的,教学方法的优劣往往直接影响到一堂课
新一轮的课程改革以来,尤其是我省采取果断措施大力推行素质教育之后,很多人陷入迷茫,不知道自己的工作怎样开展才符合时代的需求,原来以成绩和名次为抓手而忽视学生、教师和