[1]蔡明海,梁婷,吴德成.2004.桂西北丹池成矿带花岗岩地球化学特征及其构造环境.大地构造与成矿学,28(3):306-313.
 CAI Minghai,LIANG Ting,WU Decheng and HUANG Huimin.2004.GEOCHEMICAL CHARACTERISTICS OF GRANITES AND ITS STRUCTURAL GENETIC ENVIRONMENT IN THE NANDANHECHI METALLOGENETIC BELT, NORTHWEST GUANGXI.Geotectonica et Metallogenia,28(3):306-313.
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桂西北丹池成矿带花岗岩地球化学特征及其构造环境
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《大地构造与成矿学》[ISSN:ISSN 1001-1552/CN:CN 44-1595/P]

卷:
期数:
2004年28卷03期
页码:
306-313
栏目:
出版日期:
2004-08-25

文章信息/Info

Title:
GEOCHEMICAL CHARACTERISTICS OF GRANITES AND ITS STRUCTURAL GENETIC ENVIRONMENT IN THE NANDANHECHI METALLOGENETIC BELT, NORTHWEST GUANGXI
作者:
蔡明海12梁婷3 吴德成2黄惠民2
1. 宜昌地质矿产研究所,湖北 宜昌 443003; 2.柳州华锡集团有限责任公司, 广西 柳州 545006; 3.长安大学地球科学与国土资源学院, 陕西 西安 710054
Author(s):
CAI Minghai12LIANG Ting3WU Decheng2 and HUANG Huimin2
1.Yichang Institute of Geology and Minerals,Yichang, HB 443003,China; 2.Liuzhou Huaxi Co. Ltd.,Liuzhou, GX 545006,China; 3. School of Earth Sciences and Resources Management, Chang’an University, Xi’an, SX 710054, China
关键词:
花岗岩 地球化学 构造环境 丹池成矿带 桂西北
Keywords:
granite geochemistry structural environment Dachang ore field northwest Guangxi
分类号:
P597
文献标志码:
A
摘要:
丹池成矿带是我国重要的锡多金属矿业基地和著名的大厂超大型锡矿产出地。本文根据野外地质观察,结合同位素测年资料厘定了丹池成矿带内岩浆侵入期次。在研究不同岩石类型花岗岩地球化学特征的基础上,运用Al2O3—SiO2、TFeO/(TFeO+MgO)— SiO2、AFM、ACF图解以及Rb—Yb+Ta、Rb—Y+Nb、Ta—Yb和Nb—Y判别图,结合区域地质背景分析,对成矿带内花岗岩成岩构造环境进行了综合判别,进而对区内大规模成矿作用的构造环境和动力学背景进行了探讨。研究表明,区内燕山晚期花岗岩主体属后造山花岗岩类(POG型),最晚期的白岗岩为RRG+CEUG型,带内岩浆岩形成于后造山向板内环境的转化阶段,主体构造环境则为较稳定的区域拉张,岩体侵位时代代表了区内构造环境的转折时期,这种区域构造体制的转换是大规模成矿的有利动力学条件。
Abstract:
The NandanHechi metallogenetic belt is the most important tinpolymetallic producing district in China, and is the location of the Dachang superlarge tin deposit. Based on the detailed field investigation and isotopic data, the stages of magmatic activity in the NandanHechi metallogenetic belt have been lined out in this paper. Through the study about the geochemical characteristics of different granites, and by using Al2O3 vs SiO2、TFeO/(TFeO+ MgO) vs SiO2, AFM, ACF and Rb vs Y+Ta, Rb vs Y+Nb, Ta vs Yb, Nb vs Y discrimination diagrams in combination with regional geological setting analysis, the authors carried out analyses about the structural environment for the formation of the granites, and discussed the structural environment and dynamic setting for the large scale mineralization in this area. Our study indicates that the majority of the granites in NandanHechi metallogenetic belt belong to POG, while the later stage alaskite belongs to RRG+CEUG. The granites were formed at the stage of structure transformation from postorogenic phase to intraplate setting. But the major structural environment is steady regional extension. The formation age for the granites represents the time of this transformation, and this translation environment is favored for largescale metallogenesis.

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备注/Memo

备注/Memo:
收稿日期:20031021;改回日期:20031226基金项目:华锡集团有限责任公司博士后工作站科研项目“丹池成矿带构造控矿规律研究”资助.作者简介:蔡明海(1965),男,副研究员,矿床与构造地质学专业,主要从事区域成矿研究.Email:yc502cmh@sina.com
更新日期/Last Update: 2004-08-15