PLATE-TECTONICS AND GEOCHEMICAL COMPOSITION OF SANDSTONES
PLATE-TECTONICS AND GEOCHEMICAL COMPOSITION OF SANDSTONES
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DOI：
10.1086/628815
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发表时间：
1983-01-01
影响因子：
1.8
通讯作者：
BHATIA, MR
中科院分区：
文献类型：
--
作者：
BHATIA, MR
澳大利亚东部古生代浊积岩层序砂岩的主量元素地球化学变化较大，反映了各套砂岩不同的沉积物源和构造背景。根据大量的构成，区分出五组组曲：塔姆沃斯、希尔·恩德、霍奇金森、本迪戈和库克曼。砂岩的地球化学成分与沉积盆地的构造环境密切相关。根据砂岩的主要元素组成可以破译大陆边缘和大洋盆地的性质。最具判别性的参数是Fe_2O_3+MgO、TiO_2、Al_2O_3/SiO_2、K_2O/Na_2O和。总体而言，从大洋岛弧到大陆岛弧再到活动大陆边缘到被动边缘，砂岩的数量有逐渐减少和增加的趋势。大洋岛弧砂岩具有Fe_2O_3+MgO(8-14)、TiO_2(0.8-1.4)和低比值的高丰度特征。大陆岛弧型砂岩与大洋岛弧型砂岩的区别在于低砂岩和高砂岩。活动陆缘型砂岩的特征为低Fe2O3+MgO(2-5)、TiO2(0.25-0.45)和。被动缘型砂岩通常富含和亏损CaO，表明它们具有高度再循环和成熟性。
Sandstones of the Paleozoic turbidite sequences of eastern Australia show a large variation in their major element geochemistry, reflecting the distinct sedimentary provenance and tectonic setting of each suite. On the basis of bulk composition, five suites are discriminated: Tamworth, Hill End, Hodgkinson, Bendigo, and Cookman. A close correlation exists between the geochemical composition of sandstones and tectonic settings of sedimentary basins. The nature of the continental margin and oceanic basins can be deciphered on the basis of the major element composition of sandstones. The most discriminating parameters are $$Fe_{2}O_{3} + MgO\%, TiO_{2}\%, Al_{2}O_{3}/SiO_{2}, K_{2}O/Na_{2}O$$ and. In general, there is a progressive decrease in, and an increase inandin sandstones from oceanic island arc to continental island arc to active continental margins to passive margins. Oceanic island arc sandstones are characterized by the high abundance of $$Fe_{2}O_{3} + MgO (8-14\%), TiO_{2} (0.8-1.4\%)$$, and lowandratios. The continental island arc type sandstones can be distinguished from the oceanic island arc type by their lowerand, and higherand. The active continental margin type sandstones are characterized by low $$Fe_{2}O_{3} + MgO (2-5\%), TiO_{2} (0.25-0.45\%)$$ and. Passive margin type sandstones are generally enriched inand depleted in, CaO, and, suggesting their highly recycled and matured nature.