S2 Foliation Characteristics of Brittle-ductile Shear Zone in the Huanglong Gold deposit, Hanyin, South Qinling and Its Effect on Mineralization
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摘要: 南秦岭安康汉阴北部下志留统梅子垭组中已经发现了十几处规模大小不一的金矿化点和金矿床，其构成了多条规模较大的金矿化带，而这些金矿化带所处的构造位置则恰好位于该区内几条较典型的脆-韧性剪切带上，现已查明金矿体受脆-韧性剪切带控制，剪切带内多期面理置换强烈，且变形较为复杂，关于研究区面理分期及与成矿关系仍然存在争议。黄龙金矿与金矿带内其他金矿床地质特征相似，为查明以上问题，选取黄龙金矿作为研究对象，通过近几年来的野外路线调研、典型构造剖面研究和岩矿鉴定研究等，发现区内脆-韧性剪切带内至少存在3期变形变质新生面理，面理构造置换的宏观和微观特征典型，其中主变形期第二期形成的S2面理特征较为典型特殊，变形标志强烈而复杂，面理优势产状较为集中，顺面理发育热液蚀变矿物黑云母变斑晶、石榴子石等，S2面理形成于南秦岭陆内造山期，大致为晚印支-早燕山期，面理形成和演化过程中，其与金的富集成矿具有密切的关系。Abstract: In north Hanyin area of Ankang City, more than a dozen gold deposits with various sizes have been found in the Lower Silurian Meiziya Formation, forming several gold mineralization belts with large scale. In structural location, these gold mineralization belts are just located in a few typical brittle-ductile shear zones in this area. It has been ascertained that these gold ore bodies are controlled by the brittle-ductile shear zone. The foliations of these shear zone experience intense replacement, with complicated deformation. There is still controversy about the foliation staging and the relationship between foliation and mineralization in this area. The Huanglong gold deposit is similar to other gold deposits in this gold belt. To find out the above problems, the Huanglong gold deposit has been selected as the research object. Through carrying out the field route investigation and rock-mineral identification, as well as studying the typical tectonic sections in recent years, more than three stages of deformation metamorphic new foliations have been discovered in this brittle-ductile shear zone. The macroscopic and microscopic features of the metamorphic structure are typical, in which the S2 foliation formed in the second phase of the main deformation period is typical, its deformation signs are strong and complex, and its occurrences are more concentrated. The hydrothermal alteration minerals, such as biotite metacrystal and garnet, are developed along S2 foliation that formed in the intracontinental orogeny of the South Qinling Mountains. In its formation and evolution process, the S2 foliation is closely related with gold mineralization.
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Key words:
- South Qinling /
- Huanglong gold deposit /
- brittle-ductile shear zone /
- S2 foliation
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