摘要
采用高温高压岩石蠕变实验装置,对实际的岩石进行高温高压变形实验,通过观察和测试样品组构和成份的变化,考察一定温压条件下,岩石的构造变形所带来的物质组分的迁移和聚集,探讨构造动力控制成岩成矿作用的机理。实验结果表明:伴随构造变形,物质组分迁移 主要可归纳为三种类型:1)塑性或韧性流动;2)扩散与化学反应;3)热液携带。在实验后的样品中观察到:黄铣矿通过韧性流动沿韧性剪切带,韧性挤压带和韧性扭曲构造带的迁移和富集;斜长石和黑云母发生矿物成份和矿物相的转化。在实验变形过程中,Cu,Pb,Zn等成矿元素易于活化迁移,从高压区迁向低压区,K,Na,Ca,Mg等成岩元素也易活化迁移,但规律不明显,Fe,Co,Ni等元素对花岗岩样品不易活化迁移而对矿石样品则易迁移。上述实验结果对探讨成矿规律具有非常重要意义。
Several high-temperature and high-pressure experiments of rock deformation have been done to understand the material migrations with tectonic deformation and approach the mechanisms of tectono-petrogenesis and tectono-metallogenesis.The experimental results show that the material migrations can be summarizd as follows: 1) ductile or plastic flow, 2) diffuse and chemical reactions, 3) being carried by water. It has been observed that pyrite migrates and accumulates along ductile shear zones, ductile compression zones and ductile contorted zones through ductile flow, and plagioclase and biotite change their mineral components and mineral phases. During experimental deformation, the ore-forming elements such as Cu, Pb, Zn were easy to reactivate and migrate from the high compression stress region to the low, rock-forming elements such as K, Na, Ca, Mg were easy to reacti vate and migrate too but no obvions regulation; elements such as Fe, Co, Ni were not easy to reactivate and migrate to granite specimen but easy to ore specimen.The experimental results above mentioned are very important to approach metallogenetic regularity.
出处
《大地构造与成矿学》
EI
CAS
CSCD
1990年第4期325-332,共8页
Geotectonica et Metallogenia
关键词
构造动力
成岩
成矿
岩石
变形
tectono-petrogenesis and tectono-metallogenesis high-T, P experiment of rock deformation ductile flow
