我國幅員遼闊，分布有從超基性—基性—中性—酸性—堿性各時(shí)代的各類巖漿(噴發(fā))巖；沉積了從太古宙到第四紀(jì)各個(gè)時(shí)代的地層，包括各種沉積巖系、火山沉積巖系、沉積變質(zhì)巖系，為不同類型鐵礦的形成創(chuàng)造了條件。我國目前具有工業(yè)意義的鐵礦床，按其成因可分為沉積變質(zhì)型、巖漿型、接觸交代-熱液型、火山巖型、沉積型和風(fēng)化型等6種主要類型，其中以沉積變質(zhì)型最重要。現(xiàn)介紹如下：
(一)沉積變質(zhì)型鐵礦床 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33] [34] [35] [36] [37] [38] [39] [40] [41] [42] [43] [44] [45] [46] [47] [48] [49] [50] [51] [52] [53] [54] [55] [56] [57] [58] [59] [60] [61] [62] [63] [64] [65] [66] [67] [68] [69] [70] [71] [72] [73] [74] [75] [76] [77] [78] [79] [80] [81] [82] [83] [84] [85] [86] [87] [88] [89] [90] [91] [92] [93] [94] [95] [96] [97] [98] [99] [100] 下一頁 |
