Lithosphere types in North China: Evidence from geology and geophysics

Ruizhao, Qiu; Deng, Jianghong; Zhou, Shuhua; Jin-fa, LI; Xiao, Qing; Zong-xu, WU; Liu, Cui

doi:10.1360/03yd0380

Cited by 27 publications

(24 citation statements)

References 17 publications

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“…Our results are also consistent with those obtained through artificial earthquake [23] and gravity data [24]. Since the Precambrian, deformation in the Ordos Block has been weak [4], 31.2±0.9 1.70±0.01 147 a) Station st09 has no well-recorded earthquake event; b) station st11 and st18 lie on the tectonic boundaries with complex crustal structure. The crustal thickness (H) beneath them is large and unreasonable.…”

Section: Discussionsupporting

confidence: 90%

“…Meanwhile, the WNW-ESE striking Xionger-Funiu Mountains were formed in the southern NCB because of increasing N-S compression [3]. In the Cenozoic Era, many rift basins were formed around the Ordos Block due to widespread extension, caused by the Indo-Asian collision and the subduction of the Pacific Plate [4]. Also, a series of E-W and WNW-ESE striking left-lateral strike-slip faults developed along the southern margin of the NCB due to the uplift and eastward extrusion of the Tibetan Plateau [5,6].…”

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confidence: 99%

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Crustal structure of the southeastern margin of the Ordos Block

Wang

et al. 2011

Chin. Sci. Bull.

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We use a profile made up of teleseismic receiver functions to study the crustal thickness and structure of the southeastern margin of the Ordos Block. The Mohorovičić discontinuity(Moho) has been identified beneath all stations. Its depth gradually decreases towards the southeast, from about 43 km in the Ordos Block to ~30 km near the northern margin of the Qinling Orogen. Our results show clear lateral variations in the structure of the crust and the features of the Moho. Accordingly, the study region can be divided into four parts: (1) Beneath the Ordos Block, the Moho is visible and flat at a depth of ~40 km. The crustal structure is best characterized by stable cratonic crust. (2) In the Weihe-Shanxi Graben, the Moho is uplifted by about 3 km, which may be the result of upwelling of upper mantle materials. (3) Under the Xionger-Funiu Mountains, the Moho is flat at a depth between 36 and 33 km, but becomes shallower towards the southeast. (4) In the Hehuai Basin, adjacent to the northern margin of the Qinling Orogen, the Moho shows strong lateral variations with a mean depth of ~31 km. The crustal structure here is complex, which may indicate a complicated tectonic environment. Additionally, the Moho is clearly interrupted at two locations (beneath stations st11 and st18) near major tectonic boundaries. These results suggest that the structure of the deep crust along the southeastern margin of the Ordos Block has great lateral variability, which strongly affects the complex geological features on the surface. Furthermore, these results can help us understand the interrelationships of different parts of the southeastern margin of the Ordos Block. receiver function, crustal structure, Moho, H-κ stacking, CCP migration Citation:

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Section: Discussionsupporting

confidence: 90%

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confidence: 99%

Crustal structure of the southeastern margin of the Ordos Block

Wang

et al. 2011

Chin. Sci. Bull.

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“…The partial melting of the lithosphere mantle and the upwelling of the asthenosphere in the North China Craton impelled mass convection mantle material and mantle heat input to the inner continent. This caused lithosphere thinning and a tectonic-thermal action imbalance [33]. From the early Mesozoic to the Cenozoic, the lithosphere in the eastern North China Plate underwent at least 100 km of thinning, and the extension thinning was heterogeneous [34].…”

Section: Geological Influencing Factorsmentioning

confidence: 99%

Heat flow and its coalbed gas effects in the central-south area of the Huaibei coalfield, eastern China

Tan

Zhang

et al. 2010

Sci. China Earth Sci.

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Based on an analysis of the present geo-temperature field and the thermal conductivity (K) of 62 samples from the central-south area of the Huaibei coalfield in eastern China, we calculated the heat flow and plotted its distribution map. The results show that the average heat flow in the research area is about 60 mW/m 2 . It is different from other major energy basins in the North China Plate, but has close relationship with the regional geology and the deep geological setting. The heat flow is comparatively higher in the southeastern, central, and northwestern areas than in the northeastern and southwestern areas. The geo-temperature distribution map of the bottom interface of the Permian coal measure was drawn by calculating its embedding depth and geo-temperature gradients. Finally, the present gas generation condition of the Permian coal measure is discussed by associating with the temperature condition, the vitrinite reflectance (R o ), the metamorphism of coal and tectonic-burial evolution. The study indicates all present characters of the Permian coal measure, such as lower present temperature, higher R o value, middle-high rank coals, and uplift and extension events after the coal measure sediment, are favorable for the generation of secondary biogenic gas, but not thermogenic gas or primary biogenic gas. present geo-temperature, thermal conductivity, heat flow, coalbed gas, resource effect, coal measure, Huaibei coalfield Citation: Tan J Q, Ju Y W, Zhang W Y, et al. Heat flow and its coalbed gas effects in the central-south areaIn recent years, the research on the present geo-temperature field and the heat flow of energy basins has attracted much attention [1][2][3][4][5][6][7][8], but most researchers focus on oil-gas fields.As far as coalfields are concerned, analysis of the geotemperature field is mainly for coal production and only a small portion of it is for scientific purposes [9, 10]. Moreover, the drilling and developing depth of coalfields is significantly less than oil-gas fields. In China, most boreholes and mining depths in coalfields are less than 1000 m, but they can reach up to 3000-4000 m or more in oil-gas fields.Therefore, the data are fewer from coalfields than from oilgas fields, and the use of fewer data often poses a problem for deriving the characteristics of the regional geo-temperature field. Although the Huaibei coalfield is abundant in coal and coalbed methane, little research has been done on the energy effects of the geo-temperature field, and no heat flow data reported. The accumulation mechanism and origin of coalbed gas also needs further study [11][12][13][14]. Here, we calculate its heat flow and discuss its energy effects in the central-south area based on geo-temperature field analysis and widely measured thermal conductivity.

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“…The formation of Ordos Basin's basement structure is related to assembly and break itself [66,67] , and presents inhomogeneity [34,35] . Aeromagnetic data, drill-wells and seismic section interpretation shows that the positive abnormal belt accords to the uplift of basement, negative normal to the depression.…”

Section: Aeromagnetic Anomaly and Basement Structurementioning

confidence: 99%

“…The preliminary geologic, geophysical and geochemical researches indicate that during the Middle-Late Triassic the North China Plate is predominantly compression deformation, and the flexural strain is mainly distributed in the southern foothill, with deformation intensity reducing from south to north [28][29][30] . Although the North China Plate experienced the Yanshan Stage compression "activation" [31,32] and Himalayan Stage extensional "reconstruction" [33] , the host Ordos Basin in the west margin of the plate still remains some characteristics of the pre-Jurassic cratonic basement [34,35] . Therefore, these studies provide some geologic evidence and time-space constraint conditions on the syn-collision of flexural foreland and craton basin to research the basin-filling history, temporal and spatial evolution succession, as well as to understand further the plate collision process.…”

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confidence: 99%

Sequence framework of two different kinds of margins and their response to tectonic activity during the Middle-Late Triassic, Ordos Basin

Yang

Liu

Zheng

et al. 2007

Sci. China Ser. D-Earth Sci.

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Two kinds of margin respectively occur in the Ordos Basin during the Middle-Late Triassic (Yanchang Age), one is foreland margin developed under the background of flexural subsidence by thrusting intensively in the southwest margin, and the other is intracratonic basin margin by stable subsidence in northern and central parts of the basin. The Middle-Late Triassic YanchangFormation can be divided into four regional third-order sequences, which are separated by gentle angular unconformity or regional erosion surface, made up of lowstand system tract (LST), expanding system tract (EST) and highstand system tract (HST) from lower to upper within a sequence. But there are distinct differences of the sequence framework between the southwest margin and northern and central parts of the basin. The southwest margin develops heavy conglomerate layer and unconformity as a result of orogeny by thrusting, and the intracratonic basin margin by stable subsidence in the northern and central parts grows aggradational sandstone, conglomerate in fluvio-delta system and parallel unconformity. The depositional framework of southwest margin reflects the tectonic evolution from flexural subsidence by thrusting to rebounded uplift. The formation of sequence boundary is related to the resilient uplift and erosion. The sequence stratigraphic framework and depositional system tract configuration in the foreland basin are controlled by structural activity of the fold and thrust belt, and the sequence succession reflects episodic thrusting of the Middle-Late Triassic toward the foreland basin. The sequence evolution in northern and central parts reflects the depositional succession of fluvio-delta system under intracratonic background, composed of coarse-grained sediment in braided channel deposit at the lower, meandering channel deposit in the middle and fine-grained sediment in the flood plain at the upper, dominated by lake level fluctuation. During the deposit of the LST in the intracraton basin, accommodation space is limited, and results in abundant fluvial sediment migration laterally, erosion and transport, forming laterally sandstone composite and aggradational deposit on the alluvial plain, which constitutes specific erosion unconformity boundary. sequence architecture, tectonic response, basement structure, the Middle-Late Triassic (Yanchang Age), Ordos BasinAfter multi-phase rifting [1,2] , the North China Plate and South China Plate in the east of China collided in the Early Triassic Indosinian Stage [3][4][5][6] , which is continentcontinent collision related to Thetys and paleo-Pacific

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Lithosphere types in North China: Evidence from geology and geophysics

Cited by 27 publications

References 17 publications

Crustal structure of the southeastern margin of the Ordos Block

Crustal structure of the southeastern margin of the Ordos Block

Heat flow and its coalbed gas effects in the central-south area of the Huaibei coalfield, eastern China

Sequence framework of two different kinds of margins and their response to tectonic activity during the Middle-Late Triassic, Ordos Basin

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