• 首页
  • 学报简介
  • 编委会
  • 投稿指南
  • 订阅指南
  • 过刊浏览
  • 在线投稿
  • 联系我们
  • 网络预出版
  • English

本文将参加年度优秀论文评选,如果您觉得这篇文章很好,请投下您宝贵的一票,谢谢! 支持(1)   不支持(0)

贵州梵净山前寒武系甚低级变质作用研究
投稿时间:2018-07-19  修订日期:2018-09-03  点此下载全文
引用本文:王河锦,安佳丽,王冠玉,晏玉,陈梦瑶.2019.贵州梵净山前寒武系甚低级变质作用研究[J].地质学报,93(1):170-178.
WANG Hejing,AN Jiali,WANG Guanyu,YAN Yu,CHEN Mengyao.2019.Very low to low- grade metamorphism of Precambrian in Fanjingshan area, Guizhou, China[J].Acta Geologica Sinica,93(1):170-178.
DOI:10.19762/j.cnki.dizhixuebao.2019009
摘要点击次数: 295
全文下载次数: 145
作者单位E-mail
王河锦 1) 北京大学地球与空间科学学院北京1008712)“造山带与地壳演化”教育部重点实验室北京100871 hjwang@pku.edu.cn 
安佳丽 1) 北京大学地球与空间科学学院北京100871  
王冠玉 1) 北京大学地球与空间科学学院北京100871  
晏玉 1) 北京大学地球与空间科学学院北京100871  
陈梦瑶 1) 北京大学地球与空间科学学院北京100871  
基金项目:本文为国家自然科学基金项目 “黔东南前寒武系类复理石甚低级变质作用研究”(编号:41872048)资助的成果。
中文摘要:本文运用伊利石结晶度、绿泥石结晶度、云母b0值和绿泥石地质温度计研究了梵净山前寒武系甚低级变质作用。结果表明经Kisch伊利石结晶度标样校正的伊利石结晶度Kübler指数为0.20~0.99°Δ2θ,绿泥石结晶度rkai指数为0.22~0.63°Δ2θ。由此阐明梵净山前寒武系经历了成岩作用到浅变质作用的影响,迄今依然保留了成岩带、近变质带和浅变质带的岩石记录。成岩岩石具有伊蒙混层特征成岩指示矿物,浅变质带具有钠云母特征变质指示矿物。钾云母(伊利石)b0值范围为:0.9000~0.9045nm;平均0.9018nm,b0值累积频率曲线分布介于典型中压—中低压系列之间,估算的压力为366MPa。峰期变质温度为293~364℃,平均342℃,古变质温压梯度为27℃/km。近变质带界线穿越地层和梵净山背斜轴线,表明甚低级变质作用为成岩 构造运动同期或后期构造增厚引起下部和底部岩石随温压的升高而产生的。
中文关键词:伊利石结晶度  绿泥石结晶度  云母b0值  甚低级变质作用  梵净山  前寒武系
 
Very low to low- grade metamorphism of Precambrian in Fanjingshan area, Guizhou, China
Author NameAffiliationE-mail
WANG Hejing 1) School of Earth and Space Sciences, Peking University, Beijing 100871, China2) Key Laboratory of Orogenic Belt and Crustal Evolution, Ministry of Education, Beijing 100871, China hjwang@pku.edu.cn 
AN Jiali 1) School of Earth and Space Sciences, Peking University, Beijing 100871, China  
WANG Guanyu 1) School of Earth and Space Sciences, Peking University, Beijing 100871, China  
YAN Yu 1) School of Earth and Space Sciences, Peking University, Beijing 100871, China  
CHEN Mengyao 1) School of Earth and Space Sciences, Peking University, Beijing 100871, China  
Abstract:The very low to low- grade metamorphism overprinting on the Precambrian in Fanjingshan area was investigated with illite crystallinity, chlorite crystallinity, b0 value of K- micas (illite) and geothermometry of chlorite. The results demonstrate that illite crystallinity Kübler index (KI), calibrated with Kisch IC set, ranges from 0.20~0.99°Δ2θ, and the rkai index of chlorite crystallinity ranges as 0.22~0.63°Δ2θ, indicating the Precambrian in Fanjingshan area encountered with the geological processes from diagensis to epimetamorphism, and it remains diagenetic, anchizonal and epizonal records in rocks in the area studied. The diagenetic rock contains diagenetic index mineral illite- montmoriolite mixed- layer phase while anchizonal rock bears metamorphic index mineral paragonite. The b0 of K- micas (illite) ranges 0.9000~0.9045 nm, and on average 0.9018 nm or roughly equivalent to 366 MPa. The cumulative frequency curve of b0 stands in between the curves of N. New Hampshire and Otago, indicating the metamorphic pressures condition in between low- intermediate pressure and intermediate pressure facies. Peak metamorphic temperature was evaluated at 293~364℃ and average 342℃. Therefore the palaeo- gradient was derived at 27℃/km. The anchizonal boundaries across strata and folding axis of the Fanjingshan anticline, clarifying the syn- to post- sedimentary or structural movement of epimetamorphism, which caused the increasing in depth and the rising of temperature and pressure in rocks at the bottom or lower part of basin due to structural burial.
keywords:illite crystallinity  chlorite crystallinity  mica b0  very- low- grade metamorphism  Fanjingshan  Precambrian
查看全文  查看/发表评论  下载PDF阅读器
您是第10749392位访问者  京ICP备05032737号-7  京公网 安备110102004559
版权所有:《地质学报》中文版
主管单位:中国科学技术协会 主办单位:中国地质学会
地  址: 北京市西城区百万庄大街26号 邮编:100037 电话:010-68312410,010-68999025 E-mail: dizhixuebao@163.com
本系统由北京勤云科技发展有限公司设计 

京公网安备 11010202007916号

WeChat