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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第43卷

期数:

2021年第06期

页码:

978-996

栏目:

基础地质与矿产地质

出版日期:

2021-11-15

文章信息/Info

Title:

Short Wavelength Infrared Spectral Analysis of Hydrothermal Alteration Associated with Suichang Gold Polymetallic Deposit in Zhejiang, China

文章编号:

1672-6561(2021)06-0978-19

作者:

张 炎¹; 2; 段士刚^1*; 刘汉仑¹; 杨成栋¹; 陈升立³; 陈宰松³

(1. 中国地质科学院矿产资源研究所 自然资源部成矿作用与资源评价重点实验室,北京 100037; 2. 中国地质大学(北京)地球科学与资源学院,北京 100083; 3. 浙江省第七地质大队,浙江 丽水 323000)

Author(s):

ZHANG Yan¹; 2;  DUAN Shi-gang^1*;  LIU Han-lun¹;  YANG Cheng-dong¹;  CHEN Sheng-li³;  CHEN Zai-song³

(1. MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China; 2. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China; 3. No.7 Geological Party of Zhejiang Province, Lishui 323000, Zhejiang, China)

关键词:

金多金属矿床;  热液蚀变;  短波红外光谱分析;  绢云母;  绿泥石;  伊利石结晶度;  浙江

Keywords:

gold polymetallic deposit;  hydrothermal alteration;  short wavelength infrared spectral analysis;  sericite;  chlorite;  illite crystallinity;  Zhejiang

分类号:

P614; P618.51

DOI:

10.19814/j.jese.2021.03038

文献标志码:

A

摘要:

被誉为“江南第一金矿”的遂昌金多金属矿床(简称“遂昌金矿”)可采储量逐渐枯竭,随着找矿的深入,亟需新的找矿思路或技术手段来取得找矿突破。遂昌金矿区发育明显的热液蚀变,根据热液蚀变来指导找矿是一种可行的思路。利用短波红外光谱分析技术来解剖蚀变晕的矿物组成、组合、参数等信息,进而评估与成矿有关的关键信息。通过对地表蚀变岩、穿切金矿体的井下巷道及现存的穿切金矿体的一个钻孔和穿切钼矿体的两个钻孔进行采样和测试分析,提取出绢云母类、绿泥石类、高岭石类、蒙脱石类和碳酸盐类等蚀变矿物,其中绢云母类矿物最为发育,绿泥石类次之。结果表明:绢云母类矿物和绿泥石的短波红外光谱特征在空间上呈现规律性的变化。绢云母Al—OH吸收峰位(Pos2200)越小、吸收峰深度越深时,伊利石结晶度越高; 同时,越靠近矿体伊利石结晶度越大,Al—OH吸收峰位(Pos2200)越小,绿泥石Fe—OH吸收峰位(Pos2250)越大。这一规律表明短波红外光谱分析有助于查明矿床蚀变分带,为遂昌金矿的进一步找矿勘查提供科学依据,同时短波红外技术可以作为覆盖区同类型矿床的一种勘查手段。

Abstract:

Suichang gold polymetallic deposit in Zhejiang is gradually depleted in recoverable reserves. With the deepening of ore prospecting, new ideas or technical methods are urgently needed to make a breakthrough in prospecting. Obvious hydrothermal alteration is developed in Suichang gold mine. It is a feasible idea to guide ore prospecting according to hydrothermal alteration. The short wavelength infrared spectral analysis technology was explored to dissect the mineral composition, association, parameters and other information of alteration halo, and then the key information related to mineralization was evaluated. Minerals including sericite, chlorite, kaolinite, montmorillonite and carbonate are extracted based on the sampling and testing analysis of surface altered rock, underground roadways through gold orebodies, one existing borehole through gold orebodies and two boreholes through molybdenum orebodies. Among the alteration minerals, sericite is the most widely distributed, followed by chlorite. The results show that the short wavelength infrared spectral characteristics of sericite and chlorite present regular spatial changes. In sericite, the smaller the Al—OH absorption peak(Pos2200)and the deeper the absorption depth, the higher the illite crystallinity; at the same time, the illite crystallinity and Fe—OH absorption peak(Pos2250)of chlorite increase with decreasing distances to orebody, while the Al—OH absorption peak(Pos2200)shows the opposite trend. This rule indicates that a short wavelength infrared spectral analysis will be helpful to characterize the alteration zone of Suichang gold polymetallic deposit and provide a scientific basis for its further prospecting and exploration. In addition, the short wavelength infrared spectral analysis technology can be used as an exploration tool for the same type of deposit in other volcanic rock covered area.

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备注/Memo

备注/Memo:

收稿日期:2021-03-26; 修回日期:2021-08-02投稿网址:http:∥jese.chd.edu.cn/
基金项目:自然资源部深地资源成矿作用与矿产预测重点实验室基本科研业务费项目(KK2014);中国地质调查局地质调查项目(DD20201173)
作者简介:张 炎(1995-),女,河北石家庄人,理学硕士研究生,E-mail:773921610@qq.com。
*通讯作者:段士刚(1983-),男,河北邯郸人,副研究员,理学博士,E-mail:dsg1102231@163.com。

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