摘要
位于斋桑地洼区萨吾尔山北坡的布氏金矿是＂七五＂期间新发现的一个矿床。本文通过对区内典型火山岩、侵入岩体的岩石地球化学特征及锶、钕同位素的研究，确定它们形成于晚古生代，火山岩的喷发年龄为３４７Ｍａ，侵入岩的定位年龄为３１０～３２９Ｍａ；同位素特征参数＝０．７０３７～０．７０４６，都比较小，值为＋６．６７～－５．５６，近于零，值为＋５．６５～＋７．９６，大于零，说明它们具有相似的物质来源，是地幔岩浆或其衍生物熔融导生的；斋桑地洼区的基底为晚元古代甚至更老，地壳的增生可能是遵循非均一的生长模式。
u's gold deposit,found within the Seventh Five─Year Plan, is geographically situated in the northern side of Sawuer M t.,Zhaisang diwa region. By studying petro-geochemical characteristics and Sr,Nd isotopic conponents of typical volcanic rocks and intrusives in the deposit,some conclusions can be drawn as follows.Eruptive age of the volcanic rocks is 347 Ma and forming ages of the intrusives from 314 to 329 Ma.Their isotopic magmatites in this region have the similar source materials and were denved from mantle magmas or their derivatives.The continental crust of Zhaisang diwa region may be initially formed in the later Proterozoic or even more earlier and grew probably according to non-proportionated increasing model.
出处
《大地构造与成矿学》
EI
CAS
CSCD
1994年第3期219-228,共10页
Geotectonica et Metallogenia
基金
中国科学院"七五"重中之重项目
关键词
金矿床
岩浆岩
锶
钕
同位素
Sr
Nd Isotope
Mantle Source Magmatite.Ages and Bu's Gold Deposit
