摘要
丹寨卡林型金矿δ^(34)S(硫化物)主要分布在16‰～20‰之间,矿石全岩的Rb-Sr等时线年龄为400及114Ma,与矿石共生的沥青反射率为1.12%～4.41%.丹寨金矿及富集的沥青可能均来自以下寒武系为主的"黑层"沉积建造,金矿的富集阶段与麻江古油藏的形成阶段基本一致.这一想法已被模拟实验证实.在350C和100MPa压力下金矿富集于矿源层,在550C,100MPa实验条件下金矿发生大量迁移.气态烃对金矿的富集起着重要作用.
In the Danzhai Carlin-type gold deposit, the peak of the δ^(34)S frequency distribution of sulfides is at 15-20‰, the ore age is 400-114 M. a. by the Rb-Sr isochron dating of the whole rock, and the R_(mean)~o of asphalt is 1.16-4.41%. Old ore and the enriched asphalt may have been derived from sedimental formations, mainly the Lower Cambrian 'Black bed', and the formation of gold deposit may be coincidant with the period of the existance of the Majiang palaeo-oil pool. The stage of the gold enrichment may correspond to the oil-gas stage of the evolution of organic matter. This idea is favored by simulating experiments. Under the experimental condition of 350 C and 10~8Pa gold ore forms in the source bed but a great of gold ore migrates in 550℃. The gaseous hydrocarbon may play an important role in gold enrichment.
出处
《地质找矿论丛》
CAS
CSCD
1993年第4期69-81,共13页
Contributions to Geology and Mineral Resources Research
