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赣东北地区硅质岩各时代均有不同程度的发育 ,各时代硅质岩的SiO2 含量变化范围为74 .90 %～ 97.19% ,Si/Al为 10 .84～ 93.2 1,与Al2 O3呈较好的负相关关系 ,表明它们含有较高比例的陆源泥质沉积物 ,硅质岩样品的Al2 O3/ (Al2 O3+F2 O3) =0 .6 0～ 0 .99,Ce/Ce =0 .99～ 1.2 2 ,(La /Ce) N=0 .91～ 1.83,V/Y <5 .78,Ti/V >17。上述特征表明本区硅质岩形成于大陆边缘构造环境 ,而与大洋盆地及洋中脊构造环境无关。自古生代以来 ,该地区没有出现深海大洋盆地环境。
The siliceous rocks in northeastern Jiangxi Province all developed to different extents in all ages. The SiO2 contents of siliceous rocks varied from 74.9% to 97.19% in Si ages and from 10.84 to 93.21 for Si / Al, A good negative correlation indicates that they contain a higher proportion of terrigenous muddy sediments. The Al 2 O 3 / (Al 2 O 3 + F 2 O 3) = 0.60-0.999 and Ce / Ce = 0 for the chert samples. 99-1.22, (La / Ce) N = 0.91-1.83, V / Y <5.78, Ti / V> 17. The above characteristics indicate that the cherts in this area are formed in the continental margin tectonic environment, but have nothing to do with the tectonic setting of the oceanic basins and mid-ocean ridges. Since the Paleozoic, no deep oceanic basin environment has emerged in the area.