期刊文献+
共找到1篇文章
< 1 >
每页显示 20 50 100
Geology,Fluid Inclusion and Isotopic Study of the Neoproterozoic Suoi Thau Copper Deposit,Northwest Vietnam 被引量:2
1
作者 TRAN Mydung LIU Junlai +1 位作者 LI Xiaochun dang mycung 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2016年第3期913-927,共15页
The Sin Quyen-Lung Po district is an important Cu metallogenic province in Vietnam, but there are few temporal and genetic constraints on deposits from this belt. Suoi Thau is one of the representative Cu deposits ass... The Sin Quyen-Lung Po district is an important Cu metallogenic province in Vietnam, but there are few temporal and genetic constraints on deposits from this belt. Suoi Thau is one of the representative Cu deposits associated with granitic intrusion. The deposit consists of ore bodies in altered granite or along the contact zone between granite and Proterozoic meta-sedimentary rocks. The Cu-bearing intrusion is sub-alkaline I-type granite. It has a zircon U-Pb age of ~776 Ma, and has subduction-related geochemical signatures. Geochemical analysis reveals that the intrusion may be formed by melting of mafic lower crust in a subduction regime. Three stages of alteration and mineralization are identified in the Suoi Thau deposit, i.e., potassic alteration; silicification and Cu mineralization; and phyllic alteration. Two-phase aqueous fluid inclusions in quartz from silicification stage show wide ranges of homogenization temperatures (140-383℃) and salinities (4.18wt%- 19.13wt%). The high temperature and high salinity natures of some inclusions are consistent with a magmatic derivation of the fluids, which is also supported by the H-O-S isotopes. Fluids in quartz have JD values of-41.9‰ to -68.8%. The fluids in isotopic equilibrium with quartz have j180 values ranging from 7.9‰ to 9.2%. These values are just plotted in the compositional field of magmatie- hydrothermal fluids in the ~Dwater versus jlSOwater diagram. Sulfide minerals have relatively uniform j34S values from 1.84%o to 3.57%0, which is supportive of a magmatic derivation of sulfur. The fluid inclusions with relatively low temperatures and salinities most probably represent variably cooled magmatic-hydrothermal fluids. The magmatic derivation of fluids and the close spatial relationship between Cu ore bodies and intrusion suggest that the Cu mineralization most likely had a genetic association with granite. The Suoi Thau deposit, together with other deposits in the region, may define a Neoproterozoic subduction-related ore-forming belt. 展开更多
关键词 Suoi Thau deposit Fan Si Pan belt copper ore deposit subduction related mineralization
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部