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广东北部大长沙盆地粗面岩锆石SHRIMP U-Pb年龄为(135.3±1.5)Ma,形成于早白垩世早期,其Sr-Nd-Pb同位素组成为:富放射性成因铅,(206Pb/204Pb)i=18.23~18.39,(207Pb/204Pb)i=15.78~15.88,(208Pb/204Pb)i=38.83~39.14,中等的εNd(t)(=-3.35~-3.21)及较高的(87Sr/86Sr)(i=0.706871~0.709074);在Pb-Pb图解上均位于NHRL上方,△Sr值为99.1~247.