摘要
作者研究了西岭锡矿床自碎次花岗斑岩岩体的地质特征、含矿性、成因类型。认为自碎次花岗斑岩具有隐爆特征。岩浆来自上地幔至下部地壳物质的部分熔化,属于徐克勤教授所划分的过渡型地壳同熔型花岗岩类。岩体中锡含量是一般花岗岩类的10—22倍,并具有含锡岩体的有利岩石化学条件,铅同位素比值证实了成矿与成岩的紧密联系。锡矿床与自碎次花岗斑岩是同源的,应为斑岩型锡矿床。接触带和爆破角砾岩带是成矿的有利构造部位。
From studies on geological distinctions, metallization and genetic type of the auto-clastic subgranitic porphyry in Xiling tin deqiu. Sn content of the rock, which is a fa-ctcrized by hidden explosion, and the magma resulted from partial melting of upper mantle and lower crust as proposed by Xu Keqin. Sn content of the rock, which is a fa-vorable Sn-bearing rock as indicated by petrochemical parameters, is 10-22 times as high as that of ordinary granites. Close relationship between diagenesis and minero-genesis is verified by Pb isotope ratio. The tin deposit is classified as porphyry depo-sit in view of the common origin of the deposits and the antoclastic subgranitic porphy-ry. Favorable structure for metallization is the contact-zone as well .as explosive breccia.
出处
《地球化学》
CAS
1986年第1期50-57,共8页
Geochimica
