Moho properties of western Ordos block and surrounding regions constrained by teleseismic receiver functions and its tectonic implication
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摘要:
基于呈南北向线性分布且穿过鄂尔多斯地块的129个流动台站远震记录，获取了20267条远震P波接收函数.通过叠加转换点相同的接收函数，提取了可靠的P-S一次转换波和多次波到时，进而确定了南北向横跨鄂尔多斯地块剖面的地壳厚度与波速比分布.同时，利用单台速度-密度跃变（δβ-δρ）扫描叠加方法确定了Moho面速度和密度跃变.结果显示：秦岭—渭河盆地下方具有较薄地壳、低波速比（1.66~1.72）以及相对较小的密度跃变（4%~10%），表明该区域地壳主要以长英质酸性岩石为主，引起该现象的主要原因可能是下地壳拆沉；鄂尔多斯南部地壳较厚（41.4±1.3 km）、波速比较高、速度跃变相对较小（14%~23%），主要原因可能由青藏高原的挤压增厚导致；鄂尔多斯北部波速比较高（>1.87）、速度跃变较大（19%~29%）、密度跃变较小，推测鄂尔多斯北部下地壳发生部分熔融，较大波速比可能是部分熔融与沉积层共同导致的结果.
Abstract:Based on the teleseismic records of Himalaya-Ⅱ broadband seismic array with 129 stations across the Ordos block along north-south direction, 20267 teleseismic P-wave receiver functions have been obtained. We extracted the stable arrival time of P-to-S conversion and multiple reverberations by stacking the receiver functions in the bins with closed pierce points of PMs phase, and then calculated the crustal thickness and velocity ratio across the north-south section of western Ordos block. Meanwhile, the velocity and density contrast of the Moho beneath partial stations have been determined with grid searching stack technique. The results indicated that the crust is thin with low velocity ratio (1.66~1.72) and relatively small density contrast of (4%~10%) below the Qinling-Weihe graben, which imply the crust in this area is mainly composed of felsic acidic rocks. The crust of southern Ordos is thicker (41.4±1.3 km) with higher velocity ratio and smaller velocity contrast of (14%~23%), which might have been caused by the compression of the Tibetan Plateau. The velocity ratio is obviously higher than 1.87 with larger velocity contrast of (19%~29%) and smaller density contrast beneath northern Ordos. We speculated that the lower crust of northern Ordos has experienced the partial melting, the higher velocity ratio may be caused by the combination of partial melting and sedimentary layers.
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Key words:
- Receiver functions /
- Crustal thickness /
- Velocity contrast /
- Density contrast /
- Western Ordos
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图 1
研究区构造背景与台站分布
Figure 1.
The tectonic background of the study area and the distribution of seismic station The black triangles represent stations; The red crosses represent the piercing points of PMs; The black lines represent faults.
图 5
接收函数根据透射转换点叠加的剖面
Figure 5.
Stacking profile of receiving functions based on the location of piercing points The black symbols in the figure are arrival time and error bar. (a) Topography; (b) Stacking profile of receiving functions after Ps phase correction; (c) Stacking profile of receiving functions after PPs phase correction.
图 6
部分台站下方速度和密度跃变扫描结果
Figure 6.
Grid searching results of S-wave velocity and density contrasts of some stations
图 7
根据接收函数得到的地壳厚度与波速比
Figure 7.
Crustal thickness and velocity ratio from receiver functions
图 8
研究区的(a)速度跃变与(b)密度跃变结果
Figure 8.
(a) S-wave velocity contrasts and (b) density contrasts in the study
图 10
不同模型下的接收函数和速度密度跃变
Figure 10.
Synthetic receiver functions, S-wave velocity and density contrasts of different models
表 1
台站下方速度及密度跃变结果
Table 1.
S-wave velocity and density contrast of stations
台站名 经度
(°)纬度
(°)Moho深度
(km)速度
跃变
(%)密度
跃变
(%)阴山造山带 15677 42.01 107.44 40.4 25 7 15680 41.27 107.42 43.6 26 4 15682 41.42 108.44 43.2 30 3 15683 42.27 107.57 40.5 32 6 15686 41.83 107.75 42.2 18 2 15689 42.33 108.12 40.5 21 10 15692 41.72 108.21 42.7 29 8 15698 41.49 108.83 43.6 28 6 鄂尔多斯北部 15678 40.41 107.40 38.2 26 5 15702 40.12 107.51 37.0 21 7 15703 40.01 107.85 37.6 27 6 15704 39.95 108.23 37.6 22 15 15705 39.93 108.61 38.3 29 13 15708 39.74 107.90 39.1 25 10 15709 39.71 108.36 39.1 19 13 15710 39.72 108.67 39.1 20 9 15711 39.46 107.09 39.1 26 3 15712 39.47 107.44 39.1 24 9 15713 39.47 107.83 39.1 34 3 15714 39.49 108.26 39.1 25 6 15715 39.43 108.69 38.9 22 12 15719 39.18 108.25 38.4 25 7 15720 39.18 108.66 38.4 21 16 15724 38.91 108.25 37.9 25 7 15725 38.92 108.66 37.9 20 17 15730 38.01 108.32 36.6 25 12 15732 38.00 108.68 36.6 20 19 15738 38.36 108.68 36.0 21 15 15739 38.63 108.78 37.3 22 18 扬子板块 51515 32.33 107.60 43.9 17 5 61001 32.33 107.99 43.9 18 17 61009 32.84 107.21 36.7 15 4 61014 33.03 107.45 37.5 15 9 秦岭—渭河盆地 61022 33.37 107.62 43.9 19 7 61024 33.44 107.98 43.9 19 4 61029 33.57 107.55 44.7 17 10 61031 33.70 107.94 42.0 19 2 61035 33.87 107.11 41.0 23 5 61042 34.28 107.42 41.8 22 7 61044 34.35 107.06 34.9 20 4 61045 34.50 107.66 35.9 17 7 鄂尔多斯南部 61055 34.82 108.03 39.5 17 14 61057 34.92 107.78 39.6 19 9 61060 35.17 107.77 41.6 16 12 61061 36.53 108.77 42.9 23 7 62365 35.41 107.82 41.5 17 13 62377 35.76 107.69 43.0 14 10 62378 35.75 108.06 43.0 21 15 62394 36.33 107.10 43.5 24 9 62396 36.36 108.25 42.9 15 11 鄂尔多斯中部 15727 37.74 108.28 36.3 29 8 15729 37.75 108.69 36.6 23 21 61062 36.64 108.10 42.3 19 4 61063 36.68 108.47 42.2 15 8 62403 36.56 107.89 42.3 17 6 62409 36.75 107.72 42.2 21 6 62411 36.85 107.28 39.8 25 4 61064 36.85 108.78 49.8 23 15 61065 36.95 107.92 38.9 20 17 61066 36.97 107.60 38.9 26 8 61067 36.96 108.38 38.9 20 18 61068 37.13 107.42 39 21 8 61070 37.17 108.77 38.2 34 15 61072 37.22 108.38 38.2 24 7 61073 37.39 107.62 38.1 30 4 61074 37.45 107.31 37.1 25 7 61075 37.48 108.82 37.1 27 9 61076 37.49 108.04 37.1 28 3 61077 37.49 108.43 37.1 23 21 
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表 2
不同Q值对应的速度与密度跃变结果
Table 2.
The results of S-wave velocity and density contrasts according to different Q values
Q值 δβ δρ Qp=1340，Qs=600 19% 13% Qp=1340，Qs=300 19% 13% Qp=670，Qs=600 19% 13% Qp=670，Qs=300 19% 13% Qp=1340，Qs=600 19% 13% Qp=1340，Qs=300 19% 13% Qp=670，Qs=600 19% 13% Qp=670，Qs=300 19% 13%
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