Discussion on the crustal density distribution and deep crustal structure of the super-long profile from Mandula (Inner Mongolia) to Kachujia (Russia)
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摘要:
通过对南起中国内蒙古满都拉、向北经蒙古国、直抵北端俄罗斯贝加尔湖北卡楚加全长1320km长重力剖面的布格重力异常数据进行处理和解析, 依其构建了沿剖面的二维地壳密度结构模型, 并详细分析了沿剖面的地壳底界面(Moho界面)展布的深部构造特征, 及剖面辖域内的5个次级局部构造单元的重力异常场、地壳密度结构、界面起伏及断裂构造分布的特征.期望此研究结果能为该剖面跨越的中亚造山带东部地区的地壳结构、各次级构造单元的界域与关联方面的进一步研究提供相关的重力场依据.
Abstract:Using the gravity anomaly dataset of the 1320 km long profile from Mandula (Inner Mongolia) in the south, through Mongolia to the Kachujia (Russia) in the north of Baikal, the 2D crustal density structure model has been constructed in this study. We have analyzed the deep structural features along with the Moho interface of the profile including the gravity anomaly, the crustal density structure, the interface undulation and fault distribution for each tectonic unit. This result can provide the proof of gravity field for the further understanding of the crustal structure of the area across the profile, the boundaries and correlations of tectonic units, and the related continental dynamics.
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Key words:
- Mandula-Kachujia /
- Mongolia arc /
- Bouguer gravity anomaly /
- Crustal density structure
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图 1
中亚造山带大地构造位置图(肖文交等, 2019)
Figure 1.
Tectonic map of central Asian orogenic belt (Xiao, et al., 2019)
图 2
满都拉—卡楚加重力剖面地形与地理位置图
Figure 2.
Mandula-Kachujia gravity profile and its surrounding topography relief
图 3
满都拉—卡楚加剖面的地形高程分布(a)与布格重力异常(b)图
Figure 3.
Mandula-Kachujia terrain elevation (a) and Bouguer gravity anomaly (b) map
图 4
满都拉—卡楚加(重力)地学剖面的地壳密度结构
Figure 4.
Mandula- Kachujia Bouguer gravity anomaly (a) and crustal density structure (b)
图 6
贝加尔裂谷湖辖域地壳底部Moho面隆起模型
Figure 6.
Moho surface uplift model of Baikal rift lake region
表 1
贝加尔裂谷带域
Table 1.
Baikal rift region
带域南侧 哈马尔达班山脉 湖南岸侧 湖心 湖北岸侧 51.7°N(255 km) 51.9°N(238 km) 52.05°N(224 km) 52.42°N(176 km) 52.75°N(140 km) 海拔高程/m 1000 1200 1010 400 900 布格重力异常值/mGal -92 -117 -103 -193 -89 Moho界面深度/km 40.15 40 39.6 38.3 39.0 注：()内的km数值为该点距剖面北端点卡楚加(0 km)的距离(下同). 
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表 2
肯特山造山带域
Table 2.
Kentai orogenic belt region
带域南侧蒙古—鄂霍茨克缝合线处 肯特山脉最高处 肯特山脉北麓 47.6°N(709 km) 48.66°N(607 km) 49.67°N(501 km) 海拔高程/m 1200 2100 1010 布格重力异常值/mGal -168 -219 -140 Moho界面深度/km 43.0 46.1 42.6
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表 3
蒙古主缝合线响应带域
Table 3.
Mongolian main suture region
带域南界 带域中部 带域北界 45.3°N(988 km) 45.65°N(950 km) 45.9°N(918 km) 海拔高程/m 1063 1200 1255 布格重力异常值/mGal -139 -166 -147.6 Moho界面深度/km 41.1 41.5 41.8
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表 4
地壳底部Moho界面断开带域
Table 4.
Lower crustal Moho surface fault zone
带域南侧 带域中部 带域北侧 44.1°N(1125 km) 44.36°N(1095 km) 44.62°N(1065 km) 海拔高程/m 808 915 1190 布格重力异常值/mGal -116 -142 -128 Moho界面深度/km 38.6 38 40.6
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表 5
内蒙古索伦缝合线响应带域
Table 5.
Inner Mongolia Solun main suture zone
带域南界 带域中部 带域北界 42.9°N(1245 km) 43.16°N(1234 km) 43.42°N(1215 km) 海拔高程/m 1302 1229 999 布格重力异常值/mGal -144 -172 -136 Moho界面深度/km 42.5 42.4 42.0
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