Geochemistry of the dolomite from Dengying Formation in Xichuan, southwest Henan Province:Implications for paleoenvironment
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摘要:
秦岭造山带自元古宙以来就是一个活动的地质单元, 对于其演化过程的研究一直是地学中的热点问题。以淅川震旦系灯影组白云岩为研究对象, 在对虎窝剖面实测及取样的基础上, 分析了淅川灯影组白云岩微量、稀土元素等地球化学特征, 对淅川灯影组岩石学、地球化学及其沉积环境演化特征进行研究, 得出以下结论:淅川灯影组岩性主要为白云岩, 沉积相类型有潮下斜坡带、潮上云坪以及潮间带; 白云岩主要形成于盐度较高、温度较为炎热的低纬度海相环境中; 淅川灯影组主要经历了从沉积初期的水体较深、还原环境逐渐变为末期的水体较浅、弱氧化环境并且出现暴露沉积特点, 表现为整体海退的过程。本次研究对于揭示新元古代晚期秦岭地区的古环境特征及其大地构造演化史具有重要意义。
Abstract:The Qinling orogen has been an active geological unit since Proterozoic, of which the study about its origin and evolution has been a hot issue in geology for a long time.In this paper, we presented the trace and rare earth geochemical data from the dolomite of Neoproterozoic, the Dengying Formation, in the Huwo section of Xichuan area.Field work shows that the Dengying Formation mainly consists of dolomite, and can be divided into three sedimentary facies, i.e.the subtidal slope zone, intertidal zone and supratidal flat.Geochemical data indicate that the dolomite in Dengying Formation was mainly formed in a marine environment of high salinity, under hot climate and low latitudes.The Dengying Formation started from deep-water and reduction environment then changed into shallow-water and weak oxidation environment and finally exposed, showing agenerally process of regression.
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Key words:
- Xichuan /
- Dengying Formation /
- dolomite /
- geochemistry /
- palaeoenvironment
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表 1 淅川地区灯影组微量元素测试(×10-6)及计算结果
Table 1. Measured and trace calculated elements of the Dengying Formation in Xichuan (×10-6)
样品号 HW18 HW16 HW15 HW13 HW11 HW10 HW8 HW7① HW6 HW3 Be 0.17 0.12 0.07 0.14 0.04 0.05 0.04 0.07 0.08 0.13 Sc 0.39 0.21 0.10 0.41 0.94 0.75 2.01 0.35 1.99 2.89 V 19.54 21.54 21.66 33.77 29.87 27.53 268.08 37.00 162.84 57.26 Cr 5.70 5.67 5.65 5.49 8.06 5.83 8.57 6.30 10.62 13.61 Mn 46.87 47.82 40.32 58.76 63.53 59.44 208.01 177.03 154.16 194.78 Co 0.98 0.86 0.95 1.11 1.38 1.73 1.15 2.01 1.00 1.47 Ni 14.20 11.77 11.20 13.76 14.50 18.51 14.44 18.28 13.41 12.94 Ga 1.03 0.67 0.56 0.63 1.02 0.69 1.04 1.12 1.02 1.43 Sr 80.68 64.32 52.74 56.55 115.40 239.32 324.68 174.44 308.28 158.52 Zr 8.70 8.30 8.60 9.60 9.90 6.80 5.60 6.90 6.00 11.70 Ba 407.19 68.74 18.35 8.01 7.81 10.88 27.60 9.39 16.16 10.93 Hf 0.10 0.22 0.02 0.27 0.25 0.13 0.17 0.15 0.15 0.30 Th 0.50 0.44 0.39 0.50 1.31 1.28 0.84 0.43 1.56 1.56 U 1.01 0.73 1.44 2.14 1.61 1.40 0.39 1.27 0.26 0.49 Zn 4.41 5.67 5.05 13.45 9.07 25.20 7.00 48.99 8.26 8.93 Mo 0.07 0.03 0.04 0.13 0.19 0.11 0.27 0.21 0.21 0.30 Sr/Ba 0.20 0.94 2.87 7.06 14.77 21.99 11.76 18.59 19.08 14.50 U/Th 2.02 1.67 3.68 4.26 1.23 1.10 0.47 2.95 0.16 0.31 V/(V+Ni) 0.58 0.65 0.34 0.71 0.67 0.60 0.95 0.67 0.92 0.82 Ni/Co 14.45 13.65 13.41 12.41 10.50 10.71 12.61 9.08 13.41 8.81 V/Cr 3.43 3.80 3.83 6.15 3.70 4.72 31.28 5.87 15.34 4.20 Co/Zn 0.22 0.15 0.19 0.08 0.15 0.07 0.16 0.04 0.12 0.16 Mn/Sr 0.58 0.74 0.76 1.04 0.55 0.25 0.64 1.01 0.50 1.23 Sr/Mn 1.72 1.35 1.31 0.96 1.82 4.03 1.56 0.99 2.00 0.81 
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表 2 淅川地区灯影组稀土元素测试(×10-6)及计算结果
Table 2. Measured and calculated REE of the Dengying Formation in Xichuan (×10-6)
样品号 HW18 HW16 HW15 HW13 HW11 HW10 HW8 HW7① HW6 HW3 La 0.37 0.28 0.27 0.79 0.96 0.30 3.32 0.55 0.84 1.32 Ce 0.64 0.25 0.33 0.90 1.44 0.35 5.22 0.74 1.67 2.81 Pr 0.05 0.02 0.03 0.10 0.15 0.03 0.56 0.10 0.21 0.29 Nd 0.22 0.15 0.14 0.45 0.65 0.18 2.10 0.48 0.90 1.22 Sm 0.03 0.03 0.02 0.06 0.11 0.03 0.40 0.08 0.18 0.26 Eu 0.04 0.02 0.01 0.02 0.03 0.01 0.09 0.02 0.04 0.06 Gd 0.02 0.01 0.02 0.08 0.10 0.02 0.40 0.07 0.15 0.24 Tb 0.00 0.00 0.00 0.01 0.01 0.01 0.07 0.01 0.03 0.04 Dy 0.04 0.03 0.03 0.09 0.10 0.04 0.50 0.10 0.21 0.28 Ho 0.01 0.01 0.01 0.02 0.02 0.01 0.09 0.02 0.04 0.06 Er 0.02 0.01 0.01 0.05 0.05 0.02 0.26 0.06 0.11 0.13 Tm 0.0] 0.00 0.00 0.01 0.01 0.00 0.05 0.01 0.02 0.03 Yb 0.02 0.01 0.01 0.06 0.05 0.02 0.27 0.06 0.13 0.14 Lu 0.0] 0.00 0.00 0.01 0.01 0.01 0.05 0.01 0.02 0.03 Y 0.33 0.25 0.26 0.72 0.64 0.50 2.78 0.97 1.36 1.84 ΣREE 1.48 0.84 0.90 2.65 3.69 1.03 13.39 2.31 4.55 6.92 ΣLREE/ΣHREE 10.60 9.82 8.41 7.09 9.54 7.15 6.95 5.90 5.10 6.23 ΣREE+Y 1.81 1.09 1.16 3.37 4.33 1.53 16.17 3.28 5.91 8.76 Y/Ho 38.07 43.47 27.52 39.67 35.60 52.61 30.17 48.81 32.53 32.75 ΣCe/ΣY 1.98 1.02 1.26 1.25 2.25 0.70 1.88 0.76 1.23 1.53 La/Yb 11.50 13.20 14.23 8.94 13.13 11.99 8.32 6.19 4.46 6.19 La/Lu 7.60 29.39 6.99 10.24 9.97 3.49 7.65 7.12 4.35 4.57 Ce/Yb 9.70 4.53 6.69 3.90 7.57 5.33 5.03 3.36 3.42 5.06 La/Sm 6.97 5.22 8.10 7.78 5.33 6.92 5.15 4.07 2.89 3.17 Gd/Lu 0.57 1.50 0.55 1.23 1.22 0.30 1.10 1.13 0.92 0.98 δEu 4.02 3.15 1.75 0.85 0.77 1.09 0.71 0.94 0.80 0.70 δCe 1.11 0.74 0.94 0.76 0.92 0.91 0.92 0.76 0.96 1.09 注:δEu=2EuN/ (SmN+GdN); δCe=3CeN/ (2LaN+NdN); LREE:轻稀土元素; HREE:重稀土元素; ∑REE:稀土元素总量; (La/Yb) N, (La/Sm) N, (Gd/Yb) N:标准化后元素含量比值; 球粒陨石标准化数据(Boynton, 1984)。
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表 3 淅川地区灯影组古水温
Table 3. Paleo-water-temperature of Xichuan Dengying Formation
样品号 HW18 HW16 HW15 HW13 HW11 HW10 HW8 HW7① HW6 HW3 古水温(℃） 30 31 31 31 30 28 27 29 28 29
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