新疆塔尔巴哈台山发现早奥陶世蛇绿混杂岩
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摘要: 在我国境内塔尔巴哈台山下石炭统黑山头组泥岩、粉砂岩、凝灰岩和火山熔结角砾岩夹基性熔岩的底部识别出一套蛇绿混杂岩.火山角砾岩的角砾由蛇纹石化橄榄岩(蛇纹岩)、辉长岩、玄武质粗面安山岩、粗面岩和硅质岩组成.蛇绿混杂岩由蚀变辉长岩、蛇纹岩和硅质岩组成.橄榄岩虽然发生了强烈蛇纹岩化(现在为蛇纹岩),但蛇纹岩中保留了斜方辉石和橄榄石的假象.覆盖在该蛇绿岩套之上的火山角砾岩属于爆发性很强的火山喷发产物.巨大的粗粒辉长岩、玄武质粗面岩、粗面岩、硅质岩和蛇纹石化橄榄岩角砾被熔岩胶结,说明火山通道穿切了蛇绿岩套.蚀变辉长岩中的斜方辉石已经完全蛇纹石化(保留了斜方辉石假象),斜长石完全被水钙铝榴石交代(保留斜长石假象),但单斜辉石保存完好,且发育由尖晶石叶片(棒)构成的出溶结构.棕褐色的尖晶石出溶棒(或叶片)一般完全平行,个别情况下发现两组近于直交的尖晶石出溶棒.从蚀变辉长岩中分选出锆石,对其进行的SHRIMP年代学研究,结果表明辉长岩的形成时代为478.3±3.3 Ma(MSWD=1.09,n=14).这说明塔尔巴哈台蛇绿岩套岩石形成于早奥陶世.
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