满洲里地区印支期花岗岩Rb—Sr等时线年代学证据
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The Discovery of Indo_Sinian Granites in Manzhouli Area: Evidence from Rb-Sr Isochrons
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    摘要:

    满洲里-西旗地区为一重要的燕山期斑岩-次火山岩脉型浅成低温矿化区,较早期的花岗岩往往作为矿化围岩。关于本区是否存在印支期花岗岩,一直存在疑问。本文就区内四大矿区的早期花岗岩体(原推断为海西晚期或燕山早期)进行了系统的岩矿和Rb-Sr同位素年代学研究,得到两条线性关系甚好的等时线,年龄分别为211±21Ma和225.4±7.9Ma,证明该区存在印支期花岗岩。原划分的海西晚期、燕山早期花岗岩相当一部分要解体划为印支期花岗岩。

    Abstract:

    Manzhouli area is an important metallogenic province of Yanshanian porphyry-subvolcanic vein-epothermal mineralization series. The granites of the earlier stage serve as the main country rocks for ore depostis. It has always been questioned whether Indo_sinian granite exists or not in this area. In the adjacent area within Mongolia and Russia and in the Da Hinggan Mountains to its east there are Indo-sinian granites, but in Manzhouli-Xiqi area, Triassic synthem has not beens eparated out, and no definite age evidence has been sugggested.Some systematic petrological-mineralogical and Rb-Sr isotopic geochronological studies were carried out on the early stage granites from four major ore districts,which were previously considered to be late Hercynian or early Yanshanian. Two Rb-Sr isochron ages (225±7.9 Ma and 211±21Ma)obtained in this study show fine linear correlation,suggesting the existence of Indosinian granites. A considerable portion of originally-defined late Hercynian and early Yanshanian granites should be reassigned to Indosinian

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秦克章,田中亮吏,李伟实,石原舜三,1998,满洲里地区印支期花岗岩Rb—Sr等时线年代学证据[J].岩石矿物学杂志,17(3):235~240. Qin Kezhang,1998,The Discovery of Indo_Sinian Granites in Manzhouli Area: Evidence from Rb-Sr Isochrons[J]. Acta Petrologica et Mineralogica,17(3):235~240.

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