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δ13CV-PDB值为-6.5‰、δ18OV-SMOW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δ13CV-PDB、δ18OV-SMOW值逐渐增高、87Sr/86Sr值逐渐减小,该段岩层的主赋矿层位(D2d和D3t)δ13CV-PDB接近零,δ18OV-SMOW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(C2ht)白云岩的δ13C平均值为2.17‰,δ18O平均值为21.9‰,与其他层位性质明显不同,为矿区的盖层。
The Fankou lead-zinc deposit is a famous lead-zinc deposit in Guangdong Province. The Ordovician （？） strata found in the Fankou new ore district and the Cambrian strata consist of the epimetamorphic basement of the ore district. The carbon and oxygen are both lowest （δ^13Cv-PDB=-6.5%., δ^18Ov-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 δ^13Cv-PDB, δ^18Ov-SMOW and ^87Sr/^86Sr of the Devonian strata increase and decrease with the depth respec- lively. The δ^13 Cv-PDB and δ^18Ov-SMOW values of the main ore-bearing strata （Devonian） are 0 and 18%o, respec- tively. The variation of stable imtopes is mainly influenced by lithology and the late hydrothermal alteration, both of which contributed to mineralization. The average values of a13C and also for Carboniferous dolomite are 2.17%o and 21.9%,. respectively, significantly different from the data of other strata. It is thus held that the Carboniferous dolomite is the capping bed of the ore district.
出处
《矿床地质》
CAS
CSCD
北大核心
2014年第1期190-200,共11页
Mineral Deposits
基金
全国危机矿山找矿专项科研课题"湘南-粤北地区锡钨多金属矿床成矿规律总结研究"(20089927)的资助
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
geochemistry, sedimentary cycle, stable i^tope, hydrothermal alteration, Fankou lead-zinc deposit
作者简介
韩英，女，1983年生，博士，工程师，主要从事矿产地质研究。Email：hying-zi@163．com
通讯作者祝新友，男，1965年生，教授级高工，长期从事矿产地质研究。Email：zhuxinyou@gmail．com
