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鄂尔多斯盆地中奥陶统马家沟组碳酸盐岩碳、氧稳定同位素特征

Keywords: 鄂尔多斯盆地,马家沟组,碳酸盐岩,&delta,18o值,&delta,13c值

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Abstract:

?鄂尔多斯盆地中奥陶统马家沟组沉积于局限的、高盐度陆表海碳酸盐岩台地,以泥晶白云岩、泥晶石灰岩和蒸发岩为主。部分岩石经岩溶作用改造成岩溶角砾岩。马家沟组碳酸盐岩全岩或手选样品的δ18o值在-16.0‰~-1.9‰(vpdb标准,下同)之间,平均为-8.5‰;δ13c值在-16.1‰~4.83‰之间,平均为-0.90‰。激光显微采样样品δ18o值在-15.8‰~-0.8‰之间,平均为-7.7‰;δ13c值在-12.4‰~5.77‰(vpdb标准,下同)之间,平均为-0.15‰。总的来说,2种采样方法的结果没有大的差别,后者较前者能更准确地反映不同组分特征。原始沉积方解石和石灰岩δ18o最大值均为5.8‰,代表原始碳酸盐岩的δ18o值,与大多数学者的全球同位素地层学研究成果吻合。由于淡水淋滤和埋藏作用,原始沉积方解石和石灰岩δ18o最小值和平均值均较低。充填于孔隙的方解石受淡水淋滤和高温埋藏作用影响,一般有较低的δ18o值。原始沉积的白云石或白云岩δ18o最大值较原始沉积方解石和石灰岩相应值明显偏高,白云石沉积于高盐度、局限环境条件下,由微生物白云石机理形成。因形成较晚,充填于孔隙的白云石有较低的δ18o值。碳酸盐岩δ13c最大值明显偏高,与全球海水的δ13c值在晚奥陶世升高有关,鄂尔多斯盆地海水δ13c值在中奥陶世晚期已升高。受有机碳影响,部分样品具有低的δ13c值。

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