广东凡口铅锌矿床赋矿地层稳定同位素研究.pdf

2014年2月
矿床地质
第33卷第1期
February, 2014
MINERAL DEPOS
33(1):190~200
文章编号:(02587106(2014)01019011
广东凡口铅锌矿床赋矿地层稳定同位素硏究
韩英,王京彬,祝新友2“*,甄世民3
(1!有色金属矿产地质调査中心,北京100012:2中色地科矿产勘査股份有限公司,北京100012
3中国地质调查局发展研究中心,北京100037)
摘要广东凡口铅锌矿床是中国著名的大型铅锌矿床。在凡口矿区新发现有类似奥陶系岩性的地层,与寒
武系一起构成矿区的浅变质基底,其?Cv值为-6.5%、8(s值为14.9%,在矿区各地层中最小,受热液作
用影响最弱,主要受岩性影响。由深至浅,泥盆系地层的Cvm、 OV SMW值逐渐增高、7Sr/s值遂渐减小,该
段岩层的主赋矿层位(D2d和3な)おCv接近零,8Oンsw在18%左右,稳定同位素的变化除受岩性影响外,主
要受后期热液蚀变作用的影响,为成矿提供了一定的前提条件。石炭系(Cht)白云岩的3C平均值为2.17%,680
均值为21.9%‰,与其他层位性质明显不同,为矿区的盖层
关键词地球化学:沉积旋回:稳定同位素;热液蚀变;凡口铅锌矿
中图分类号:P618.42:P618.43
文献标志码:A
Stable isotope study of ore-bearing strata of Fankou lead-zinc deposit
Guangdong Province
AN Ying, WANG Jingbin ZHU Xin You? and ZI EN Shimin
China o erous Metals Resouce logical Survey, Bejing 100012, China 2 China Non-ferous Metals Resource
( l Survey, Beijing Institute of eology and Mineral Resources, Beijing 100012, China; 3 Development Research
Center of China Geological Survey, Beijing 100037, China)
Abstract
strata ound in the Fankou new ore district and the Cambrian strata consist o&tovince. The Ordovician (
The Fankou lead-zinc deposit is a famous lead-zinc deposit in Gguangdong P
e epimctarnorphic basement of
the ore district. The carbon and oxygen are both lowest(6cv=-65%, 6 smow=14.9%)in the
strata of the ore district, mainly influenced by the strata but least influenced by the hydrothermal process. The
valucs of Cv P, Ov smow and r/r of the Devonian strata increas and decrease with the pth respec
The 6cv H and 6ovswow values of the main ore-bearing strata(Devonian are 0 and 18%, respec
tively. The variation of stable isotopes is mainly influenced by lithology and the late hydrothermal alteration
both of which contributed to mineralization. The average values of 6C and O for Carb i erous dolomite are
2. 17%o and 21.9%0, respcctivcly, significantly different from the data of other strata. It is thus held that the
Carboniferous dolomite is the capping bed of the ore district
Key words: geochemistry, seimentary cycle, table i tope, hydrothermal alteration, Fankou lead-zinc deposit
本文得到全国危机矿山找矿专项科研课题“湘南-粵北地区锡钨多金属矿床成矿规律总结研究"20089927)的资助
第作省简介英,女,1983年生,博上:,工程师,土要从事矿产地质研究。Email:h-ying-z@163.com
通讯作者祝新友,男,1965年生,教授级高1.长期从事矿产地质研究。Fmal: zhuxinyou( a grail. com
收稿门期201.3-02-14:改同日期2014-01-13。秦思婷编辑。