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引言斯里兰卡岛,除了西北部狭窄海岸是被中新世灰岩和钙质砂岩覆盖之外,主要是由前寒武纪变质岩组成。斯里兰卡的前寒武纪地层可分为三个主要单位(图1): ①高兰岩系(Highland Series),是由紫苏辉石花岗岩(紫苏花岗岩)、石英岩、大理岩、含石榴石片麻岩、角闪片麻岩和麻粒岩组成的辉石麻粒岩相岩层。②维贾扬岩系(Vijayan Series),是由角闪黑云片麻岩、混合岩和花岗岩组成的角闪麻粒岩相岩层。 3西南群(Southwest Group),是由堇青石片麻岩、紫苏片麻岩、含石榴石片麻岩、硅灰石岩和斑花大理岩组成的堇青石麻粒岩相岩层。
INTRODUCTION Sri Lanka Island, except for the narrow northwestern coast covered by Miocene limestone and calcareous sandstone, is predominantly composed of Precambrian metamorphic rocks. The Precambrian strata in Sri Lanka can be divided into three main units (Fig. 1): ① The Highland Series consists of peridotite granodiorite (peridotite), quartzite, marble and garnet Gneiss, hornblende gneiss and granulite pyroxene granulite facies. ② The Vijayan Series is a hornblende-related granulite rock consisting of hornblendeble biotite gneisses, mixed rocks and granites. 3 Southwest Group is a cordierite granulite facies comprised of cordierite gneiss, perilla gneiss, garnet gneiss, wollastonite and piedmont marble.