摘要
本文主要记述了治岭头、八宝山和庄山三个矿区,通过与金矿有关的流体包裹体的研究,阐明了成矿的物理化学条件和矿床的成因。它们的成矿温度主要集中于140～330℃,为低温矿床。成矿的压力集中于12～41MPa,成矿深度约为0.3～1.2km。气体组分的还原参数较低,平均为0.4,fo_2约为10^(-32)～10^(-41),成矿溶液富水和CO_2。治岭头成矿溶液为NaCl-KCl-CaSO_4-H_2O体系,而八宝山为KCl-NaCl-CaSO_4-H_2O体系,属于弱酸性。成矿溶液的含盐度为(0.7～2.5)wt%NaCl,属于低盐度,其密度值为0.7～0.85g/c1m^3。流体包裹体氢氧同位素δD(‰)为-58.5至91.1,δ^(18)O_(H_2O)(‰)为+3至-9,成矿溶液主要由大气降水(或地下水)和岩浆热液混合组成。
This paper deals with fluid inclusions, physico-chemical conditions for the genesis of the Zhilingtou, Babaoshan and Zhuangshan deposits (occurrences). They are low-temperature deposits with forming temperature ranging from 140 to 330℃. The pressure of ore formation ranges from 120 to 410 bars (12～41MPa)and the depth of ore formation is about 0.3～1.2 km. The reduction parameter of gaseous components is low~, averaging 0.4. The oxygen fugacity f_(o_2) is relatively low, ranglng from 10^(-38) to 10^(-41). The ore-forming fluids are characterized by high H_2O and CO_2 contents. The ore-forming fluids of Zhilingtou belong to the NaCl-KCl-CaSO_4-H_2O system, and of Babaoshan to KCl-NaCl-CaSO_4-H_2O system. The pH values show that the ore-forming fluids are weakly acid. The salinity is low, ranging from 0.7 to 2.5 wt.% and the density is about 0.7～0.85g/cm^3. According to hydrogen and oxygen isotope data of fluid inclusions, δD(‰)varies from-58.5 to-91.1 and δ^(18)O_(H_2O)(‰)from +3 to-6.67. This indicates that the ore-forming fluids for the three deposits (occurrences)are composed mainly of meteoric waters (or ground waters) and magmatic hydrothermal fluids.
出处
《矿物学报》
CAS
CSCD
北大核心
1991年第4期422-428,共7页
Acta Mineralogica Sinica
关键词
金矿
流体
包裹体
矿床
火山岩
volcanic rock
gold deposits
fluid inclusion
Zhejiang
